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SUSE:SLE-12-SP1:Update
qemu.11146
0194-9pfs-rename-virtio-9p.c-to-9p.c.patch
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File 0194-9pfs-rename-virtio-9p.c-to-9p.c.patch of Package qemu.11146
From 79016ac3cb453378e707fecfd5c3c83f61e3bbac Mon Sep 17 00:00:00 2001 From: Wei Liu <wei.liu2@citrix.com> Date: Thu, 7 Jan 2016 18:42:20 +0000 Subject: [PATCH] 9pfs: rename virtio-9p.c to 9p.c Now that file only contains generic code. Signed-off-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> (cherry picked from commit 60ce86c7140d5ca33d5fd87ce821681165d06b2a) [BR: Fix and/or infrastructure for BSC#1020427 CVE-2016-9602] Signed-off-by: Bruce Rogers <brogers@suse.com> --- hw/9pfs/9p.c | 3276 +++++++++++++++++++++++++++++++++++++++++ hw/9pfs/Makefile.objs | 2 +- hw/9pfs/virtio-9p.c | 3276 ----------------------------------------- 3 files changed, 3277 insertions(+), 3277 deletions(-) diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c new file mode 100644 index 0000000000..ad9d3f0f29 --- /dev/null +++ b/hw/9pfs/9p.c @@ -0,0 +1,3276 @@ +/* + * Virtio 9p backend + * + * Copyright IBM, Corp. 2010 + * + * Authors: + * Anthony Liguori <aliguori@us.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#include "hw/virtio/virtio.h" +#include "hw/i386/pc.h" +#include "qemu/sockets.h" +#include "virtio-9p.h" +#include "fsdev/qemu-fsdev.h" +#include "9p-xattr.h" +#include "virtio-9p-coth.h" +#include "trace.h" +#include "migration/migration.h" + +int open_fd_hw; +int total_open_fd; +static int open_fd_rc; + +enum { + Oread = 0x00, + Owrite = 0x01, + Ordwr = 0x02, + Oexec = 0x03, + Oexcl = 0x04, + Otrunc = 0x10, + Orexec = 0x20, + Orclose = 0x40, + Oappend = 0x80, +}; + +ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) +{ + ssize_t ret; + va_list ap; + + va_start(ap, fmt); + ret = virtio_pdu_vmarshal(pdu, offset, fmt, ap); + va_end(ap); + + return ret; +} + +ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) +{ + ssize_t ret; + va_list ap; + + va_start(ap, fmt); + ret = virtio_pdu_vunmarshal(pdu, offset, fmt, ap); + va_end(ap); + + return ret; +} + +static void pdu_push_and_notify(V9fsPDU *pdu) +{ + virtio_9p_push_and_notify(pdu); +} + +static int omode_to_uflags(int8_t mode) +{ + int ret = 0; + + switch (mode & 3) { + case Oread: + ret = O_RDONLY; + break; + case Ordwr: + ret = O_RDWR; + break; + case Owrite: + ret = O_WRONLY; + break; + case Oexec: + ret = O_RDONLY; + break; + } + + if (mode & Otrunc) { + ret |= O_TRUNC; + } + + if (mode & Oappend) { + ret |= O_APPEND; + } + + if (mode & Oexcl) { + ret |= O_EXCL; + } + + return ret; +} + +struct dotl_openflag_map { + int dotl_flag; + int open_flag; +}; + +static int dotl_to_open_flags(int flags) +{ + int i; + /* + * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY + * and P9_DOTL_NOACCESS + */ + int oflags = flags & O_ACCMODE; + + struct dotl_openflag_map dotl_oflag_map[] = { + { P9_DOTL_CREATE, O_CREAT }, + { P9_DOTL_EXCL, O_EXCL }, + { P9_DOTL_NOCTTY , O_NOCTTY }, + { P9_DOTL_TRUNC, O_TRUNC }, + { P9_DOTL_APPEND, O_APPEND }, + { P9_DOTL_NONBLOCK, O_NONBLOCK } , + { P9_DOTL_DSYNC, O_DSYNC }, + { P9_DOTL_FASYNC, FASYNC }, + { P9_DOTL_DIRECT, O_DIRECT }, + { P9_DOTL_LARGEFILE, O_LARGEFILE }, + { P9_DOTL_DIRECTORY, O_DIRECTORY }, + { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, + { P9_DOTL_NOATIME, O_NOATIME }, + { P9_DOTL_SYNC, O_SYNC }, + }; + + for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { + if (flags & dotl_oflag_map[i].dotl_flag) { + oflags |= dotl_oflag_map[i].open_flag; + } + } + + return oflags; +} + +void cred_init(FsCred *credp) +{ + credp->fc_uid = -1; + credp->fc_gid = -1; + credp->fc_mode = -1; + credp->fc_rdev = -1; +} + +static int get_dotl_openflags(V9fsState *s, int oflags) +{ + int flags; + /* + * Filter the client open flags + */ + flags = dotl_to_open_flags(oflags); + flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); + /* + * Ignore direct disk access hint until the server supports it. + */ + flags &= ~O_DIRECT; + return flags; +} + +void v9fs_path_init(V9fsPath *path) +{ + path->data = NULL; + path->size = 0; +} + +void v9fs_path_free(V9fsPath *path) +{ + g_free(path->data); + path->data = NULL; + path->size = 0; +} + +void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs) +{ + v9fs_path_free(lhs); + lhs->data = g_malloc(rhs->size); + memcpy(lhs->data, rhs->data, rhs->size); + lhs->size = rhs->size; +} + +int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, + const char *name, V9fsPath *path) +{ + int err; + err = s->ops->name_to_path(&s->ctx, dirpath, name, path); + if (err < 0) { + err = -errno; + } + return err; +} + +/* + * Return TRUE if s1 is an ancestor of s2. + * + * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". + * As a special case, We treat s1 as ancestor of s2 if they are same! + */ +static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) +{ + if (!strncmp(s1->data, s2->data, s1->size - 1)) { + if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { + return 1; + } + } + return 0; +} + +static size_t v9fs_string_size(V9fsString *str) +{ + return str->size; +} + +/* + * returns 0 if fid got re-opened, 1 if not, < 0 on error */ +static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) +{ + int err = 1; + if (f->fid_type == P9_FID_FILE) { + if (f->fs.fd == -1) { + do { + err = v9fs_co_open(pdu, f, f->open_flags); + } while (err == -EINTR && !pdu->cancelled); + } + } else if (f->fid_type == P9_FID_DIR) { + if (f->fs.dir == NULL) { + do { + err = v9fs_co_opendir(pdu, f); + } while (err == -EINTR && !pdu->cancelled); + } + } + return err; +} + +static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid) +{ + int err; + V9fsFidState *f; + V9fsState *s = pdu->s; + + for (f = s->fid_list; f; f = f->next) { + BUG_ON(f->clunked); + if (f->fid == fid) { + /* + * Update the fid ref upfront so that + * we don't get reclaimed when we yield + * in open later. + */ + f->ref++; + /* + * check whether we need to reopen the + * file. We might have closed the fd + * while trying to free up some file + * descriptors. + */ + err = v9fs_reopen_fid(pdu, f); + if (err < 0) { + f->ref--; + return NULL; + } + /* + * Mark the fid as referenced so that the LRU + * reclaim won't close the file descriptor + */ + f->flags |= FID_REFERENCED; + return f; + } + } + return NULL; +} + +static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) +{ + V9fsFidState *f; + + for (f = s->fid_list; f; f = f->next) { + /* If fid is already there return NULL */ + BUG_ON(f->clunked); + if (f->fid == fid) { + return NULL; + } + } + f = g_malloc0(sizeof(V9fsFidState)); + f->fid = fid; + f->fid_type = P9_FID_NONE; + f->ref = 1; + /* + * Mark the fid as referenced so that the LRU + * reclaim won't close the file descriptor + */ + f->flags |= FID_REFERENCED; + f->next = s->fid_list; + s->fid_list = f; + + return f; +} + +static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) +{ + int retval = 0; + + if (fidp->fs.xattr.copied_len == -1) { + /* getxattr/listxattr fid */ + goto free_value; + } + /* + * if this is fid for setxattr. clunk should + * result in setxattr localcall + */ + if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { + /* clunk after partial write */ + retval = -EINVAL; + goto free_out; + } + if (fidp->fs.xattr.len) { + retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, + fidp->fs.xattr.value, + fidp->fs.xattr.len, + fidp->fs.xattr.flags); + } else { + retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); + } +free_out: + v9fs_string_free(&fidp->fs.xattr.name); +free_value: + g_free(fidp->fs.xattr.value); + return retval; +} + +static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp) +{ + int retval = 0; + + if (fidp->fid_type == P9_FID_FILE) { + /* If we reclaimed the fd no need to close */ + if (fidp->fs.fd != -1) { + retval = v9fs_co_close(pdu, &fidp->fs); + } + } else if (fidp->fid_type == P9_FID_DIR) { + if (fidp->fs.dir != NULL) { + retval = v9fs_co_closedir(pdu, &fidp->fs); + } + } else if (fidp->fid_type == P9_FID_XATTR) { + retval = v9fs_xattr_fid_clunk(pdu, fidp); + } + v9fs_path_free(&fidp->path); + g_free(fidp); + return retval; +} + +static int put_fid(V9fsPDU *pdu, V9fsFidState *fidp) +{ + BUG_ON(!fidp->ref); + fidp->ref--; + /* + * Don't free the fid if it is in reclaim list + */ + if (!fidp->ref && fidp->clunked) { + if (fidp->fid == pdu->s->root_fid) { + /* + * if the clunked fid is root fid then we + * have unmounted the fs on the client side. + * delete the migration blocker. Ideally, this + * should be hooked to transport close notification + */ + if (pdu->s->migration_blocker) { + migrate_del_blocker(pdu->s->migration_blocker); + error_free(pdu->s->migration_blocker); + pdu->s->migration_blocker = NULL; + } + } + return free_fid(pdu, fidp); + } + return 0; +} + +static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) +{ + V9fsFidState **fidpp, *fidp; + + for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { + if ((*fidpp)->fid == fid) { + break; + } + } + if (*fidpp == NULL) { + return NULL; + } + fidp = *fidpp; + *fidpp = fidp->next; + fidp->clunked = 1; + return fidp; +} + +void v9fs_reclaim_fd(V9fsPDU *pdu) +{ + int reclaim_count = 0; + V9fsState *s = pdu->s; + V9fsFidState *f, *reclaim_list = NULL; + + for (f = s->fid_list; f; f = f->next) { + /* + * Unlink fids cannot be reclaimed. Check + * for them and skip them. Also skip fids + * currently being operated on. + */ + if (f->ref || f->flags & FID_NON_RECLAIMABLE) { + continue; + } + /* + * if it is a recently referenced fid + * we leave the fid untouched and clear the + * reference bit. We come back to it later + * in the next iteration. (a simple LRU without + * moving list elements around) + */ + if (f->flags & FID_REFERENCED) { + f->flags &= ~FID_REFERENCED; + continue; + } + /* + * Add fids to reclaim list. + */ + if (f->fid_type == P9_FID_FILE) { + if (f->fs.fd != -1) { + /* + * Up the reference count so that + * a clunk request won't free this fid + */ + f->ref++; + f->rclm_lst = reclaim_list; + reclaim_list = f; + f->fs_reclaim.fd = f->fs.fd; + f->fs.fd = -1; + reclaim_count++; + } + } else if (f->fid_type == P9_FID_DIR) { + if (f->fs.dir != NULL) { + /* + * Up the reference count so that + * a clunk request won't free this fid + */ + f->ref++; + f->rclm_lst = reclaim_list; + reclaim_list = f; + f->fs_reclaim.dir = f->fs.dir; + f->fs.dir = NULL; + reclaim_count++; + } + } + if (reclaim_count >= open_fd_rc) { + break; + } + } + /* + * Now close the fid in reclaim list. Free them if they + * are already clunked. + */ + while (reclaim_list) { + f = reclaim_list; + reclaim_list = f->rclm_lst; + if (f->fid_type == P9_FID_FILE) { + v9fs_co_close(pdu, &f->fs_reclaim); + } else if (f->fid_type == P9_FID_DIR) { + v9fs_co_closedir(pdu, &f->fs_reclaim); + } + f->rclm_lst = NULL; + /* + * Now drop the fid reference, free it + * if clunked. + */ + put_fid(pdu, f); + } +} + +static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) +{ + int err; + V9fsState *s = pdu->s; + V9fsFidState *fidp, head_fid; + + head_fid.next = s->fid_list; + for (fidp = s->fid_list; fidp; fidp = fidp->next) { + if (fidp->path.size != path->size) { + continue; + } + if (!memcmp(fidp->path.data, path->data, path->size)) { + /* Mark the fid non reclaimable. */ + fidp->flags |= FID_NON_RECLAIMABLE; + + /* reopen the file/dir if already closed */ + err = v9fs_reopen_fid(pdu, fidp); + if (err < 0) { + return -1; + } + /* + * Go back to head of fid list because + * the list could have got updated when + * switched to the worker thread + */ + if (err == 0) { + fidp = &head_fid; + } + } + } + return 0; +} + +static void virtfs_reset(V9fsPDU *pdu) +{ + V9fsState *s = pdu->s; + V9fsFidState *fidp = NULL; + + /* Free all fids */ + while (s->fid_list) { + fidp = s->fid_list; + s->fid_list = fidp->next; + + if (fidp->ref) { + fidp->clunked = 1; + } else { + free_fid(pdu, fidp); + } + } + if (fidp) { + /* One or more unclunked fids found... */ + error_report("9pfs:%s: One or more uncluncked fids " + "found during reset", __func__); + } +} + +#define P9_QID_TYPE_DIR 0x80 +#define P9_QID_TYPE_SYMLINK 0x02 + +#define P9_STAT_MODE_DIR 0x80000000 +#define P9_STAT_MODE_APPEND 0x40000000 +#define P9_STAT_MODE_EXCL 0x20000000 +#define P9_STAT_MODE_MOUNT 0x10000000 +#define P9_STAT_MODE_AUTH 0x08000000 +#define P9_STAT_MODE_TMP 0x04000000 +#define P9_STAT_MODE_SYMLINK 0x02000000 +#define P9_STAT_MODE_LINK 0x01000000 +#define P9_STAT_MODE_DEVICE 0x00800000 +#define P9_STAT_MODE_NAMED_PIPE 0x00200000 +#define P9_STAT_MODE_SOCKET 0x00100000 +#define P9_STAT_MODE_SETUID 0x00080000 +#define P9_STAT_MODE_SETGID 0x00040000 +#define P9_STAT_MODE_SETVTX 0x00010000 + +#define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ + P9_STAT_MODE_SYMLINK | \ + P9_STAT_MODE_LINK | \ + P9_STAT_MODE_DEVICE | \ + P9_STAT_MODE_NAMED_PIPE | \ + P9_STAT_MODE_SOCKET) + +/* This is the algorithm from ufs in spfs */ +static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) +{ + size_t size; + + memset(&qidp->path, 0, sizeof(qidp->path)); + size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); + memcpy(&qidp->path, &stbuf->st_ino, size); + qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); + qidp->type = 0; + if (S_ISDIR(stbuf->st_mode)) { + qidp->type |= P9_QID_TYPE_DIR; + } + if (S_ISLNK(stbuf->st_mode)) { + qidp->type |= P9_QID_TYPE_SYMLINK; + } +} + +static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp) +{ + struct stat stbuf; + int err; + + err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); + if (err < 0) { + return err; + } + stat_to_qid(&stbuf, qidp); + return 0; +} + +V9fsPDU *pdu_alloc(V9fsState *s) +{ + V9fsPDU *pdu = NULL; + + if (!QLIST_EMPTY(&s->free_list)) { + pdu = QLIST_FIRST(&s->free_list); + QLIST_REMOVE(pdu, next); + QLIST_INSERT_HEAD(&s->active_list, pdu, next); + } + return pdu; +} + +void pdu_free(V9fsPDU *pdu) +{ + if (pdu) { + V9fsState *s = pdu->s; + /* + * Cancelled pdu are added back to the freelist + * by flush request . + */ + if (!pdu->cancelled) { + QLIST_REMOVE(pdu, next); + QLIST_INSERT_HEAD(&s->free_list, pdu, next); + } + } +} + +/* + * We don't do error checking for pdu_marshal/unmarshal here + * because we always expect to have enough space to encode + * error details + */ +static void pdu_complete(V9fsPDU *pdu, ssize_t len) +{ + int8_t id = pdu->id + 1; /* Response */ + V9fsState *s = pdu->s; + + if (len < 0) { + int err = -len; + len = 7; + + if (s->proto_version != V9FS_PROTO_2000L) { + V9fsString str; + + str.data = strerror(err); + str.size = strlen(str.data); + + len += pdu_marshal(pdu, len, "s", &str); + id = P9_RERROR; + } + + len += pdu_marshal(pdu, len, "d", err); + + if (s->proto_version == V9FS_PROTO_2000L) { + id = P9_RLERROR; + } + trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ + } + + /* fill out the header */ + pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); + + /* keep these in sync */ + pdu->size = len; + pdu->id = id; + + pdu_push_and_notify(pdu); + + /* Now wakeup anybody waiting in flush for this request */ + qemu_co_queue_next(&pdu->complete); + + pdu_free(pdu); +} + +static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) +{ + mode_t ret; + + ret = mode & 0777; + if (mode & P9_STAT_MODE_DIR) { + ret |= S_IFDIR; + } + + if (mode & P9_STAT_MODE_SYMLINK) { + ret |= S_IFLNK; + } + if (mode & P9_STAT_MODE_SOCKET) { + ret |= S_IFSOCK; + } + if (mode & P9_STAT_MODE_NAMED_PIPE) { + ret |= S_IFIFO; + } + if (mode & P9_STAT_MODE_DEVICE) { + if (extension->size && extension->data[0] == 'c') { + ret |= S_IFCHR; + } else { + ret |= S_IFBLK; + } + } + + if (!(ret&~0777)) { + ret |= S_IFREG; + } + + if (mode & P9_STAT_MODE_SETUID) { + ret |= S_ISUID; + } + if (mode & P9_STAT_MODE_SETGID) { + ret |= S_ISGID; + } + if (mode & P9_STAT_MODE_SETVTX) { + ret |= S_ISVTX; + } + + return ret; +} + +static int donttouch_stat(V9fsStat *stat) +{ + if (stat->type == -1 && + stat->dev == -1 && + stat->qid.type == -1 && + stat->qid.version == -1 && + stat->qid.path == -1 && + stat->mode == -1 && + stat->atime == -1 && + stat->mtime == -1 && + stat->length == -1 && + !stat->name.size && + !stat->uid.size && + !stat->gid.size && + !stat->muid.size && + stat->n_uid == -1 && + stat->n_gid == -1 && + stat->n_muid == -1) { + return 1; + } + + return 0; +} + +static void v9fs_stat_init(V9fsStat *stat) +{ + v9fs_string_init(&stat->name); + v9fs_string_init(&stat->uid); + v9fs_string_init(&stat->gid); + v9fs_string_init(&stat->muid); + v9fs_string_init(&stat->extension); +} + +static void v9fs_stat_free(V9fsStat *stat) +{ + v9fs_string_free(&stat->name); + v9fs_string_free(&stat->uid); + v9fs_string_free(&stat->gid); + v9fs_string_free(&stat->muid); + v9fs_string_free(&stat->extension); +} + +static uint32_t stat_to_v9mode(const struct stat *stbuf) +{ + uint32_t mode; + + mode = stbuf->st_mode & 0777; + if (S_ISDIR(stbuf->st_mode)) { + mode |= P9_STAT_MODE_DIR; + } + + if (S_ISLNK(stbuf->st_mode)) { + mode |= P9_STAT_MODE_SYMLINK; + } + + if (S_ISSOCK(stbuf->st_mode)) { + mode |= P9_STAT_MODE_SOCKET; + } + + if (S_ISFIFO(stbuf->st_mode)) { + mode |= P9_STAT_MODE_NAMED_PIPE; + } + + if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { + mode |= P9_STAT_MODE_DEVICE; + } + + if (stbuf->st_mode & S_ISUID) { + mode |= P9_STAT_MODE_SETUID; + } + + if (stbuf->st_mode & S_ISGID) { + mode |= P9_STAT_MODE_SETGID; + } + + if (stbuf->st_mode & S_ISVTX) { + mode |= P9_STAT_MODE_SETVTX; + } + + return mode; +} + +static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name, + const struct stat *stbuf, + V9fsStat *v9stat) +{ + int err; + const char *str; + + memset(v9stat, 0, sizeof(*v9stat)); + + stat_to_qid(stbuf, &v9stat->qid); + v9stat->mode = stat_to_v9mode(stbuf); + v9stat->atime = stbuf->st_atime; + v9stat->mtime = stbuf->st_mtime; + v9stat->length = stbuf->st_size; + + v9fs_string_null(&v9stat->uid); + v9fs_string_null(&v9stat->gid); + v9fs_string_null(&v9stat->muid); + + v9stat->n_uid = stbuf->st_uid; + v9stat->n_gid = stbuf->st_gid; + v9stat->n_muid = 0; + + v9fs_string_null(&v9stat->extension); + + if (v9stat->mode & P9_STAT_MODE_SYMLINK) { + err = v9fs_co_readlink(pdu, name, &v9stat->extension); + if (err < 0) { + return err; + } + } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { + v9fs_string_sprintf(&v9stat->extension, "%c %u %u", + S_ISCHR(stbuf->st_mode) ? 'c' : 'b', + major(stbuf->st_rdev), minor(stbuf->st_rdev)); + } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { + v9fs_string_sprintf(&v9stat->extension, "%s %lu", + "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); + } + + str = strrchr(name->data, '/'); + if (str) { + str += 1; + } else { + str = name->data; + } + + v9fs_string_sprintf(&v9stat->name, "%s", str); + + v9stat->size = 61 + + v9fs_string_size(&v9stat->name) + + v9fs_string_size(&v9stat->uid) + + v9fs_string_size(&v9stat->gid) + + v9fs_string_size(&v9stat->muid) + + v9fs_string_size(&v9stat->extension); + return 0; +} + +#define P9_STATS_MODE 0x00000001ULL +#define P9_STATS_NLINK 0x00000002ULL +#define P9_STATS_UID 0x00000004ULL +#define P9_STATS_GID 0x00000008ULL +#define P9_STATS_RDEV 0x00000010ULL +#define P9_STATS_ATIME 0x00000020ULL +#define P9_STATS_MTIME 0x00000040ULL +#define P9_STATS_CTIME 0x00000080ULL +#define P9_STATS_INO 0x00000100ULL +#define P9_STATS_SIZE 0x00000200ULL +#define P9_STATS_BLOCKS 0x00000400ULL + +#define P9_STATS_BTIME 0x00000800ULL +#define P9_STATS_GEN 0x00001000ULL +#define P9_STATS_DATA_VERSION 0x00002000ULL + +#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ +#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ + + +static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf, + V9fsStatDotl *v9lstat) +{ + memset(v9lstat, 0, sizeof(*v9lstat)); + + v9lstat->st_mode = stbuf->st_mode; + v9lstat->st_nlink = stbuf->st_nlink; + v9lstat->st_uid = stbuf->st_uid; + v9lstat->st_gid = stbuf->st_gid; + v9lstat->st_rdev = stbuf->st_rdev; + v9lstat->st_size = stbuf->st_size; + v9lstat->st_blksize = stbuf->st_blksize; + v9lstat->st_blocks = stbuf->st_blocks; + v9lstat->st_atime_sec = stbuf->st_atime; + v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; + v9lstat->st_mtime_sec = stbuf->st_mtime; + v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; + v9lstat->st_ctime_sec = stbuf->st_ctime; + v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; + /* Currently we only support BASIC fields in stat */ + v9lstat->st_result_mask = P9_STATS_BASIC; + + stat_to_qid(stbuf, &v9lstat->qid); +} + +static void print_sg(struct iovec *sg, int cnt) +{ + int i; + + printf("sg[%d]: {", cnt); + for (i = 0; i < cnt; i++) { + if (i) { + printf(", "); + } + printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); + } + printf("}\n"); +} + +/* Will call this only for path name based fid */ +static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) +{ + V9fsPath str; + v9fs_path_init(&str); + v9fs_path_copy(&str, dst); + v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len); + v9fs_path_free(&str); + /* +1 to include terminating NULL */ + dst->size++; +} + +static inline bool is_ro_export(FsContext *ctx) +{ + return ctx->export_flags & V9FS_RDONLY; +} + +static void v9fs_version(void *opaque) +{ + ssize_t err; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + V9fsString version; + size_t offset = 7; + + v9fs_string_init(&version); + err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); + if (err < 0) { + offset = err; + goto out; + } + trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); + + virtfs_reset(pdu); + + if (!strcmp(version.data, "9P2000.u")) { + s->proto_version = V9FS_PROTO_2000U; + } else if (!strcmp(version.data, "9P2000.L")) { + s->proto_version = V9FS_PROTO_2000L; + } else { + v9fs_string_sprintf(&version, "unknown"); + } + + err = pdu_marshal(pdu, offset, "ds", s->msize, &version); + if (err < 0) { + offset = err; + goto out; + } + offset += err; + trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); +out: + pdu_complete(pdu, offset); + v9fs_string_free(&version); +} + +static void v9fs_attach(void *opaque) +{ + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + int32_t fid, afid, n_uname; + V9fsString uname, aname; + V9fsFidState *fidp; + size_t offset = 7; + V9fsQID qid; + ssize_t err; + + v9fs_string_init(&uname); + v9fs_string_init(&aname); + err = pdu_unmarshal(pdu, offset, "ddssd", &fid, + &afid, &uname, &aname, &n_uname); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); + + fidp = alloc_fid(s, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + fidp->uid = n_uname; + err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); + if (err < 0) { + err = -EINVAL; + clunk_fid(s, fid); + goto out; + } + err = fid_to_qid(pdu, fidp, &qid); + if (err < 0) { + err = -EINVAL; + clunk_fid(s, fid); + goto out; + } + err = pdu_marshal(pdu, offset, "Q", &qid); + if (err < 0) { + clunk_fid(s, fid); + goto out; + } + err += offset; + trace_v9fs_attach_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path); + /* + * disable migration if we haven't done already. + * attach could get called multiple times for the same export. + */ + if (!s->migration_blocker) { + s->root_fid = fid; + error_setg(&s->migration_blocker, + "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", + s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); + migrate_add_blocker(s->migration_blocker); + } +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&uname); + v9fs_string_free(&aname); +} + +static void v9fs_stat(void *opaque) +{ + int32_t fid; + V9fsStat v9stat; + ssize_t err = 0; + size_t offset = 7; + struct stat stbuf; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + + err = pdu_unmarshal(pdu, offset, "d", &fid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_stat(pdu->tag, pdu->id, fid); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); + if (err < 0) { + goto out; + } + err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat); + if (err < 0) { + goto out; + } + err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); + if (err < 0) { + v9fs_stat_free(&v9stat); + goto out; + } + trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, + v9stat.atime, v9stat.mtime, v9stat.length); + err += offset; + v9fs_stat_free(&v9stat); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); +} + +static void v9fs_getattr(void *opaque) +{ + int32_t fid; + size_t offset = 7; + ssize_t retval = 0; + struct stat stbuf; + V9fsFidState *fidp; + uint64_t request_mask; + V9fsStatDotl v9stat_dotl; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); + if (retval < 0) { + goto out_nofid; + } + trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + retval = -ENOENT; + goto out_nofid; + } + /* + * Currently we only support BASIC fields in stat, so there is no + * need to look at request_mask. + */ + retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); + if (retval < 0) { + goto out; + } + stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl); + + /* fill st_gen if requested and supported by underlying fs */ + if (request_mask & P9_STATS_GEN) { + retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); + switch (retval) { + case 0: + /* we have valid st_gen: update result mask */ + v9stat_dotl.st_result_mask |= P9_STATS_GEN; + break; + case -EINTR: + /* request cancelled, e.g. by Tflush */ + goto out; + default: + /* failed to get st_gen: not fatal, ignore */ + break; + } + } + retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); + if (retval < 0) { + goto out; + } + retval += offset; + trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, + v9stat_dotl.st_mode, v9stat_dotl.st_uid, + v9stat_dotl.st_gid); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, retval); +} + +/* Attribute flags */ +#define P9_ATTR_MODE (1 << 0) +#define P9_ATTR_UID (1 << 1) +#define P9_ATTR_GID (1 << 2) +#define P9_ATTR_SIZE (1 << 3) +#define P9_ATTR_ATIME (1 << 4) +#define P9_ATTR_MTIME (1 << 5) +#define P9_ATTR_CTIME (1 << 6) +#define P9_ATTR_ATIME_SET (1 << 7) +#define P9_ATTR_MTIME_SET (1 << 8) + +#define P9_ATTR_MASK 127 + +static void v9fs_setattr(void *opaque) +{ + int err = 0; + int32_t fid; + V9fsFidState *fidp; + size_t offset = 7; + V9fsIattr v9iattr; + V9fsPDU *pdu = opaque; + + err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); + if (err < 0) { + goto out_nofid; + } + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + if (v9iattr.valid & P9_ATTR_MODE) { + err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); + if (err < 0) { + goto out; + } + } + if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { + struct timespec times[2]; + if (v9iattr.valid & P9_ATTR_ATIME) { + if (v9iattr.valid & P9_ATTR_ATIME_SET) { + times[0].tv_sec = v9iattr.atime_sec; + times[0].tv_nsec = v9iattr.atime_nsec; + } else { + times[0].tv_nsec = UTIME_NOW; + } + } else { + times[0].tv_nsec = UTIME_OMIT; + } + if (v9iattr.valid & P9_ATTR_MTIME) { + if (v9iattr.valid & P9_ATTR_MTIME_SET) { + times[1].tv_sec = v9iattr.mtime_sec; + times[1].tv_nsec = v9iattr.mtime_nsec; + } else { + times[1].tv_nsec = UTIME_NOW; + } + } else { + times[1].tv_nsec = UTIME_OMIT; + } + err = v9fs_co_utimensat(pdu, &fidp->path, times); + if (err < 0) { + goto out; + } + } + /* + * If the only valid entry in iattr is ctime we can call + * chown(-1,-1) to update the ctime of the file + */ + if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || + ((v9iattr.valid & P9_ATTR_CTIME) + && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { + if (!(v9iattr.valid & P9_ATTR_UID)) { + v9iattr.uid = -1; + } + if (!(v9iattr.valid & P9_ATTR_GID)) { + v9iattr.gid = -1; + } + err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, + v9iattr.gid); + if (err < 0) { + goto out; + } + } + if (v9iattr.valid & (P9_ATTR_SIZE)) { + err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); + if (err < 0) { + goto out; + } + } + err = offset; +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); +} + +static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) +{ + int i; + ssize_t err; + size_t offset = 7; + + err = pdu_marshal(pdu, offset, "w", nwnames); + if (err < 0) { + return err; + } + offset += err; + for (i = 0; i < nwnames; i++) { + err = pdu_marshal(pdu, offset, "Q", &qids[i]); + if (err < 0) { + return err; + } + offset += err; + } + return offset; +} + +static void v9fs_walk(void *opaque) +{ + int name_idx; + V9fsQID *qids = NULL; + int i, err = 0; + V9fsPath dpath, path; + uint16_t nwnames; + struct stat stbuf; + size_t offset = 7; + int32_t fid, newfid; + V9fsString *wnames = NULL; + V9fsFidState *fidp; + V9fsFidState *newfidp = NULL; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); + if (err < 0) { + pdu_complete(pdu, err); + return ; + } + offset += err; + + trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); + + if (nwnames && nwnames <= P9_MAXWELEM) { + wnames = g_malloc0(sizeof(wnames[0]) * nwnames); + qids = g_malloc0(sizeof(qids[0]) * nwnames); + for (i = 0; i < nwnames; i++) { + err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); + if (err < 0) { + goto out_nofid; + } + offset += err; + } + } else if (nwnames > P9_MAXWELEM) { + err = -EINVAL; + goto out_nofid; + } + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + v9fs_path_init(&dpath); + v9fs_path_init(&path); + /* + * Both dpath and path initially poin to fidp. + * Needed to handle request with nwnames == 0 + */ + v9fs_path_copy(&dpath, &fidp->path); + v9fs_path_copy(&path, &fidp->path); + for (name_idx = 0; name_idx < nwnames; name_idx++) { + err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, &path); + if (err < 0) { + goto out; + } + err = v9fs_co_lstat(pdu, &path, &stbuf); + if (err < 0) { + goto out; + } + stat_to_qid(&stbuf, &qids[name_idx]); + v9fs_path_copy(&dpath, &path); + } + if (fid == newfid) { + BUG_ON(fidp->fid_type != P9_FID_NONE); + v9fs_path_copy(&fidp->path, &path); + } else { + newfidp = alloc_fid(s, newfid); + if (newfidp == NULL) { + err = -EINVAL; + goto out; + } + newfidp->uid = fidp->uid; + v9fs_path_copy(&newfidp->path, &path); + } + err = v9fs_walk_marshal(pdu, nwnames, qids); + trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); +out: + put_fid(pdu, fidp); + if (newfidp) { + put_fid(pdu, newfidp); + } + v9fs_path_free(&dpath); + v9fs_path_free(&path); +out_nofid: + pdu_complete(pdu, err); + if (nwnames && nwnames <= P9_MAXWELEM) { + for (name_idx = 0; name_idx < nwnames; name_idx++) { + v9fs_string_free(&wnames[name_idx]); + } + g_free(wnames); + g_free(qids); + } +} + +static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path) +{ + struct statfs stbuf; + int32_t iounit = 0; + V9fsState *s = pdu->s; + + /* + * iounit should be multiples of f_bsize (host filesystem block size + * and as well as less than (client msize - P9_IOHDRSZ)) + */ + if (!v9fs_co_statfs(pdu, path, &stbuf)) { + iounit = stbuf.f_bsize; + iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize; + } + if (!iounit) { + iounit = s->msize - P9_IOHDRSZ; + } + return iounit; +} + +static void v9fs_open(void *opaque) +{ + int flags; + int32_t fid; + int32_t mode; + V9fsQID qid; + int iounit = 0; + ssize_t err = 0; + size_t offset = 7; + struct stat stbuf; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + if (s->proto_version == V9FS_PROTO_2000L) { + err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); + } else { + uint8_t modebyte; + err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); + mode = modebyte; + } + if (err < 0) { + goto out_nofid; + } + trace_v9fs_open(pdu->tag, pdu->id, fid, mode); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + BUG_ON(fidp->fid_type != P9_FID_NONE); + + err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); + if (err < 0) { + goto out; + } + stat_to_qid(&stbuf, &qid); + if (S_ISDIR(stbuf.st_mode)) { + err = v9fs_co_opendir(pdu, fidp); + if (err < 0) { + goto out; + } + fidp->fid_type = P9_FID_DIR; + err = pdu_marshal(pdu, offset, "Qd", &qid, 0); + if (err < 0) { + goto out; + } + err += offset; + } else { + if (s->proto_version == V9FS_PROTO_2000L) { + flags = get_dotl_openflags(s, mode); + } else { + flags = omode_to_uflags(mode); + } + if (is_ro_export(&s->ctx)) { + if (mode & O_WRONLY || mode & O_RDWR || + mode & O_APPEND || mode & O_TRUNC) { + err = -EROFS; + goto out; + } + } + err = v9fs_co_open(pdu, fidp, flags); + if (err < 0) { + goto out; + } + fidp->fid_type = P9_FID_FILE; + fidp->open_flags = flags; + if (flags & O_EXCL) { + /* + * We let the host file system do O_EXCL check + * We should not reclaim such fd + */ + fidp->flags |= FID_NON_RECLAIMABLE; + } + iounit = get_iounit(pdu, &fidp->path); + err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); + if (err < 0) { + goto out; + } + err += offset; + } + trace_v9fs_open_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path, iounit); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); +} + +static void v9fs_lcreate(void *opaque) +{ + int32_t dfid, flags, mode; + gid_t gid; + ssize_t err = 0; + ssize_t offset = 7; + V9fsString name; + V9fsFidState *fidp; + struct stat stbuf; + V9fsQID qid; + int32_t iounit; + V9fsPDU *pdu = opaque; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, + &name, &flags, &mode, &gid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); + + fidp = get_fid(pdu, dfid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + + flags = get_dotl_openflags(pdu->s, flags); + err = v9fs_co_open2(pdu, fidp, &name, gid, + flags | O_CREAT, mode, &stbuf); + if (err < 0) { + goto out; + } + fidp->fid_type = P9_FID_FILE; + fidp->open_flags = flags; + if (flags & O_EXCL) { + /* + * We let the host file system do O_EXCL check + * We should not reclaim such fd + */ + fidp->flags |= FID_NON_RECLAIMABLE; + } + iounit = get_iounit(pdu, &fidp->path); + stat_to_qid(&stbuf, &qid); + err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); + if (err < 0) { + goto out; + } + err += offset; + trace_v9fs_lcreate_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path, iounit); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + +static void v9fs_fsync(void *opaque) +{ + int err; + int32_t fid; + int datasync; + size_t offset = 7; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + + err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + err = v9fs_co_fsync(pdu, fidp, datasync); + if (!err) { + err = offset; + } + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); +} + +static void v9fs_clunk(void *opaque) +{ + int err; + int32_t fid; + size_t offset = 7; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + err = pdu_unmarshal(pdu, offset, "d", &fid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_clunk(pdu->tag, pdu->id, fid); + + fidp = clunk_fid(s, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + /* + * Bump the ref so that put_fid will + * free the fid. + */ + fidp->ref++; + err = put_fid(pdu, fidp); + if (!err) { + err = offset; + } +out_nofid: + pdu_complete(pdu, err); +} + +static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, + uint64_t off, uint32_t max_count) +{ + ssize_t err; + size_t offset = 7; + int read_count; + int64_t xattr_len; + + xattr_len = fidp->fs.xattr.len; + read_count = xattr_len - off; + if (read_count > max_count) { + read_count = max_count; + } else if (read_count < 0) { + /* + * read beyond XATTR value + */ + read_count = 0; + } + err = pdu_marshal(pdu, offset, "d", read_count); + if (err < 0) { + return err; + } + offset += err; + err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset, + ((char *)fidp->fs.xattr.value) + off, + read_count); + if (err < 0) { + return err; + } + offset += err; + return offset; +} + +static int v9fs_do_readdir_with_stat(V9fsPDU *pdu, + V9fsFidState *fidp, uint32_t max_count) +{ + V9fsPath path; + V9fsStat v9stat; + int len, err = 0; + int32_t count = 0; + struct stat stbuf; + off_t saved_dir_pos; + struct dirent *dent, *result; + + /* save the directory position */ + saved_dir_pos = v9fs_co_telldir(pdu, fidp); + if (saved_dir_pos < 0) { + return saved_dir_pos; + } + + dent = g_malloc(sizeof(struct dirent)); + + while (1) { + v9fs_path_init(&path); + err = v9fs_co_readdir_r(pdu, fidp, dent, &result); + if (err || !result) { + break; + } + err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); + if (err < 0) { + goto out; + } + err = v9fs_co_lstat(pdu, &path, &stbuf); + if (err < 0) { + goto out; + } + err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat); + if (err < 0) { + goto out; + } + /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ + len = pdu_marshal(pdu, 11 + count, "S", &v9stat); + if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) { + /* Ran out of buffer. Set dir back to old position and return */ + v9fs_co_seekdir(pdu, fidp, saved_dir_pos); + v9fs_stat_free(&v9stat); + v9fs_path_free(&path); + g_free(dent); + return count; + } + count += len; + v9fs_stat_free(&v9stat); + v9fs_path_free(&path); + saved_dir_pos = dent->d_off; + } +out: + g_free(dent); + v9fs_path_free(&path); + if (err < 0) { + return err; + } + return count; +} + +/* + * Create a QEMUIOVector for a sub-region of PDU iovecs + * + * @qiov: uninitialized QEMUIOVector + * @skip: number of bytes to skip from beginning of PDU + * @size: number of bytes to include + * @is_write: true - write, false - read + * + * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up + * with qemu_iovec_destroy(). + */ +static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, + size_t skip, size_t size, + bool is_write) +{ + QEMUIOVector elem; + struct iovec *iov; + unsigned int niov; + + virtio_init_iov_from_pdu(pdu, &iov, &niov, is_write); + + qemu_iovec_init_external(&elem, iov, niov); + qemu_iovec_init(qiov, niov); + qemu_iovec_concat(qiov, &elem, skip, size); +} + +static void v9fs_read(void *opaque) +{ + int32_t fid; + uint64_t off; + ssize_t err = 0; + int32_t count = 0; + size_t offset = 7; + uint32_t max_count; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + if (fidp->fid_type == P9_FID_DIR) { + + if (off == 0) { + v9fs_co_rewinddir(pdu, fidp); + } + count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); + if (count < 0) { + err = count; + goto out; + } + err = pdu_marshal(pdu, offset, "d", count); + if (err < 0) { + goto out; + } + err += offset + count; + } else if (fidp->fid_type == P9_FID_FILE) { + QEMUIOVector qiov_full; + QEMUIOVector qiov; + int32_t len; + + v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); + qemu_iovec_init(&qiov, qiov_full.niov); + do { + qemu_iovec_reset(&qiov); + qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); + if (0) { + print_sg(qiov.iov, qiov.niov); + } + /* Loop in case of EINTR */ + do { + len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); + if (len >= 0) { + off += len; + count += len; + } + } while (len == -EINTR && !pdu->cancelled); + if (len < 0) { + /* IO error return the error */ + err = len; + goto out; + } + } while (count < max_count && len > 0); + err = pdu_marshal(pdu, offset, "d", count); + if (err < 0) { + goto out; + } + err += offset + count; + qemu_iovec_destroy(&qiov); + qemu_iovec_destroy(&qiov_full); + } else if (fidp->fid_type == P9_FID_XATTR) { + err = v9fs_xattr_read(s, pdu, fidp, off, max_count); + } else { + err = -EINVAL; + } + trace_v9fs_read_return(pdu->tag, pdu->id, count, err); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); +} + +static size_t v9fs_readdir_data_size(V9fsString *name) +{ + /* + * Size of each dirent on the wire: size of qid (13) + size of offset (8) + * size of type (1) + size of name.size (2) + strlen(name.data) + */ + return 24 + v9fs_string_size(name); +} + +static int v9fs_do_readdir(V9fsPDU *pdu, + V9fsFidState *fidp, int32_t max_count) +{ + size_t size; + V9fsQID qid; + V9fsString name; + int len, err = 0; + int32_t count = 0; + off_t saved_dir_pos; + struct dirent *dent, *result; + + /* save the directory position */ + saved_dir_pos = v9fs_co_telldir(pdu, fidp); + if (saved_dir_pos < 0) { + return saved_dir_pos; + } + + dent = g_malloc(sizeof(struct dirent)); + + while (1) { + err = v9fs_co_readdir_r(pdu, fidp, dent, &result); + if (err || !result) { + break; + } + v9fs_string_init(&name); + v9fs_string_sprintf(&name, "%s", dent->d_name); + if ((count + v9fs_readdir_data_size(&name)) > max_count) { + /* Ran out of buffer. Set dir back to old position and return */ + v9fs_co_seekdir(pdu, fidp, saved_dir_pos); + v9fs_string_free(&name); + g_free(dent); + return count; + } + /* + * Fill up just the path field of qid because the client uses + * only that. To fill the entire qid structure we will have + * to stat each dirent found, which is expensive + */ + size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); + memcpy(&qid.path, &dent->d_ino, size); + /* Fill the other fields with dummy values */ + qid.type = 0; + qid.version = 0; + + /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ + len = pdu_marshal(pdu, 11 + count, "Qqbs", + &qid, dent->d_off, + dent->d_type, &name); + if (len < 0) { + v9fs_co_seekdir(pdu, fidp, saved_dir_pos); + v9fs_string_free(&name); + g_free(dent); + return len; + } + count += len; + v9fs_string_free(&name); + saved_dir_pos = dent->d_off; + } + g_free(dent); + if (err < 0) { + return err; + } + return count; +} + +static void v9fs_readdir(void *opaque) +{ + int32_t fid; + V9fsFidState *fidp; + ssize_t retval = 0; + size_t offset = 7; + uint64_t initial_offset; + int32_t count; + uint32_t max_count; + V9fsPDU *pdu = opaque; + + retval = pdu_unmarshal(pdu, offset, "dqd", &fid, + &initial_offset, &max_count); + if (retval < 0) { + goto out_nofid; + } + trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + retval = -EINVAL; + goto out_nofid; + } + if (!fidp->fs.dir) { + retval = -EINVAL; + goto out; + } + if (initial_offset == 0) { + v9fs_co_rewinddir(pdu, fidp); + } else { + v9fs_co_seekdir(pdu, fidp, initial_offset); + } + count = v9fs_do_readdir(pdu, fidp, max_count); + if (count < 0) { + retval = count; + goto out; + } + retval = pdu_marshal(pdu, offset, "d", count); + if (retval < 0) { + goto out; + } + retval += count + offset; + trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, retval); +} + +static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, + uint64_t off, uint32_t count, + struct iovec *sg, int cnt) +{ + int i, to_copy; + ssize_t err = 0; + int write_count; + int64_t xattr_len; + size_t offset = 7; + + + xattr_len = fidp->fs.xattr.len; + write_count = xattr_len - off; + if (write_count > count) { + write_count = count; + } else if (write_count < 0) { + /* + * write beyond XATTR value len specified in + * xattrcreate + */ + err = -ENOSPC; + goto out; + } + err = pdu_marshal(pdu, offset, "d", write_count); + if (err < 0) { + return err; + } + err += offset; + fidp->fs.xattr.copied_len += write_count; + /* + * Now copy the content from sg list + */ + for (i = 0; i < cnt; i++) { + if (write_count > sg[i].iov_len) { + to_copy = sg[i].iov_len; + } else { + to_copy = write_count; + } + memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); + /* updating vs->off since we are not using below */ + off += to_copy; + write_count -= to_copy; + } +out: + return err; +} + +static void v9fs_write(void *opaque) +{ + ssize_t err; + int32_t fid; + uint64_t off; + uint32_t count; + int32_t len = 0; + int32_t total = 0; + size_t offset = 7; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + QEMUIOVector qiov_full; + QEMUIOVector qiov; + + err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); + if (err < 0) { + pdu_complete(pdu, err); + return; + } + offset += err; + v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); + trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + if (fidp->fid_type == P9_FID_FILE) { + if (fidp->fs.fd == -1) { + err = -EINVAL; + goto out; + } + } else if (fidp->fid_type == P9_FID_XATTR) { + /* + * setxattr operation + */ + err = v9fs_xattr_write(s, pdu, fidp, off, count, + qiov_full.iov, qiov_full.niov); + goto out; + } else { + err = -EINVAL; + goto out; + } + qemu_iovec_init(&qiov, qiov_full.niov); + do { + qemu_iovec_reset(&qiov); + qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); + if (0) { + print_sg(qiov.iov, qiov.niov); + } + /* Loop in case of EINTR */ + do { + len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); + if (len >= 0) { + off += len; + total += len; + } + } while (len == -EINTR && !pdu->cancelled); + if (len < 0) { + /* IO error return the error */ + err = len; + goto out_qiov; + } + } while (total < count && len > 0); + + offset = 7; + err = pdu_marshal(pdu, offset, "d", total); + if (err < 0) { + goto out; + } + err += offset; + trace_v9fs_write_return(pdu->tag, pdu->id, total, err); +out_qiov: + qemu_iovec_destroy(&qiov); +out: + put_fid(pdu, fidp); +out_nofid: + qemu_iovec_destroy(&qiov_full); + pdu_complete(pdu, err); +} + +static void v9fs_create(void *opaque) +{ + int32_t fid; + int err = 0; + size_t offset = 7; + V9fsFidState *fidp; + V9fsQID qid; + int32_t perm; + int8_t mode; + V9fsPath path; + struct stat stbuf; + V9fsString name; + V9fsString extension; + int iounit; + V9fsPDU *pdu = opaque; + + v9fs_path_init(&path); + v9fs_string_init(&name); + v9fs_string_init(&extension); + err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, + &perm, &mode, &extension); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + if (perm & P9_STAT_MODE_DIR) { + err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, + fidp->uid, -1, &stbuf); + if (err < 0) { + goto out; + } + err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); + if (err < 0) { + goto out; + } + v9fs_path_copy(&fidp->path, &path); + err = v9fs_co_opendir(pdu, fidp); + if (err < 0) { + goto out; + } + fidp->fid_type = P9_FID_DIR; + } else if (perm & P9_STAT_MODE_SYMLINK) { + err = v9fs_co_symlink(pdu, fidp, &name, + extension.data, -1 , &stbuf); + if (err < 0) { + goto out; + } + err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); + if (err < 0) { + goto out; + } + v9fs_path_copy(&fidp->path, &path); + } else if (perm & P9_STAT_MODE_LINK) { + int32_t ofid = atoi(extension.data); + V9fsFidState *ofidp = get_fid(pdu, ofid); + if (ofidp == NULL) { + err = -EINVAL; + goto out; + } + err = v9fs_co_link(pdu, ofidp, fidp, &name); + put_fid(pdu, ofidp); + if (err < 0) { + goto out; + } + err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); + if (err < 0) { + fidp->fid_type = P9_FID_NONE; + goto out; + } + v9fs_path_copy(&fidp->path, &path); + err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); + if (err < 0) { + fidp->fid_type = P9_FID_NONE; + goto out; + } + } else if (perm & P9_STAT_MODE_DEVICE) { + char ctype; + uint32_t major, minor; + mode_t nmode = 0; + + if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { + err = -errno; + goto out; + } + + switch (ctype) { + case 'c': + nmode = S_IFCHR; + break; + case 'b': + nmode = S_IFBLK; + break; + default: + err = -EIO; + goto out; + } + + nmode |= perm & 0777; + err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, + makedev(major, minor), nmode, &stbuf); + if (err < 0) { + goto out; + } + err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); + if (err < 0) { + goto out; + } + v9fs_path_copy(&fidp->path, &path); + } else if (perm & P9_STAT_MODE_NAMED_PIPE) { + err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, + 0, S_IFIFO | (perm & 0777), &stbuf); + if (err < 0) { + goto out; + } + err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); + if (err < 0) { + goto out; + } + v9fs_path_copy(&fidp->path, &path); + } else if (perm & P9_STAT_MODE_SOCKET) { + err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, + 0, S_IFSOCK | (perm & 0777), &stbuf); + if (err < 0) { + goto out; + } + err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); + if (err < 0) { + goto out; + } + v9fs_path_copy(&fidp->path, &path); + } else { + err = v9fs_co_open2(pdu, fidp, &name, -1, + omode_to_uflags(mode)|O_CREAT, perm, &stbuf); + if (err < 0) { + goto out; + } + fidp->fid_type = P9_FID_FILE; + fidp->open_flags = omode_to_uflags(mode); + if (fidp->open_flags & O_EXCL) { + /* + * We let the host file system do O_EXCL check + * We should not reclaim such fd + */ + fidp->flags |= FID_NON_RECLAIMABLE; + } + } + iounit = get_iounit(pdu, &fidp->path); + stat_to_qid(&stbuf, &qid); + err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); + if (err < 0) { + goto out; + } + err += offset; + trace_v9fs_create_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path, iounit); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); + v9fs_string_free(&extension); + v9fs_path_free(&path); +} + +static void v9fs_symlink(void *opaque) +{ + V9fsPDU *pdu = opaque; + V9fsString name; + V9fsString symname; + V9fsFidState *dfidp; + V9fsQID qid; + struct stat stbuf; + int32_t dfid; + int err = 0; + gid_t gid; + size_t offset = 7; + + v9fs_string_init(&name); + v9fs_string_init(&symname); + err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); + + dfidp = get_fid(pdu, dfid); + if (dfidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); + if (err < 0) { + goto out; + } + stat_to_qid(&stbuf, &qid); + err = pdu_marshal(pdu, offset, "Q", &qid); + if (err < 0) { + goto out; + } + err += offset; + trace_v9fs_symlink_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path); +out: + put_fid(pdu, dfidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); + v9fs_string_free(&symname); +} + +static void v9fs_flush(void *opaque) +{ + ssize_t err; + int16_t tag; + size_t offset = 7; + V9fsPDU *cancel_pdu; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + err = pdu_unmarshal(pdu, offset, "w", &tag); + if (err < 0) { + pdu_complete(pdu, err); + return; + } + trace_v9fs_flush(pdu->tag, pdu->id, tag); + + QLIST_FOREACH(cancel_pdu, &s->active_list, next) { + if (cancel_pdu->tag == tag) { + break; + } + } + if (cancel_pdu) { + cancel_pdu->cancelled = 1; + /* + * Wait for pdu to complete. + */ + qemu_co_queue_wait(&cancel_pdu->complete); + cancel_pdu->cancelled = 0; + pdu_free(cancel_pdu); + } + pdu_complete(pdu, 7); +} + +static void v9fs_link(void *opaque) +{ + V9fsPDU *pdu = opaque; + int32_t dfid, oldfid; + V9fsFidState *dfidp, *oldfidp; + V9fsString name; + size_t offset = 7; + int err = 0; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); + + dfidp = get_fid(pdu, dfid); + if (dfidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + + oldfidp = get_fid(pdu, oldfid); + if (oldfidp == NULL) { + err = -ENOENT; + goto out; + } + err = v9fs_co_link(pdu, oldfidp, dfidp, &name); + if (!err) { + err = offset; + } +out: + put_fid(pdu, dfidp); +out_nofid: + v9fs_string_free(&name); + pdu_complete(pdu, err); +} + +/* Only works with path name based fid */ +static void v9fs_remove(void *opaque) +{ + int32_t fid; + int err = 0; + size_t offset = 7; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + + err = pdu_unmarshal(pdu, offset, "d", &fid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_remove(pdu->tag, pdu->id, fid); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + /* if fs driver is not path based, return EOPNOTSUPP */ + if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { + err = -EOPNOTSUPP; + goto out_err; + } + /* + * IF the file is unlinked, we cannot reopen + * the file later. So don't reclaim fd + */ + err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); + if (err < 0) { + goto out_err; + } + err = v9fs_co_remove(pdu, &fidp->path); + if (!err) { + err = offset; + } +out_err: + /* For TREMOVE we need to clunk the fid even on failed remove */ + clunk_fid(pdu->s, fidp->fid); + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); +} + +static void v9fs_unlinkat(void *opaque) +{ + int err = 0; + V9fsString name; + int32_t dfid, flags; + size_t offset = 7; + V9fsPath path; + V9fsFidState *dfidp; + V9fsPDU *pdu = opaque; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); + if (err < 0) { + goto out_nofid; + } + dfidp = get_fid(pdu, dfid); + if (dfidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + /* + * IF the file is unlinked, we cannot reopen + * the file later. So don't reclaim fd + */ + v9fs_path_init(&path); + err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); + if (err < 0) { + goto out_err; + } + err = v9fs_mark_fids_unreclaim(pdu, &path); + if (err < 0) { + goto out_err; + } + err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags); + if (!err) { + err = offset; + } +out_err: + put_fid(pdu, dfidp); + v9fs_path_free(&path); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + + +/* Only works with path name based fid */ +static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, + int32_t newdirfid, V9fsString *name) +{ + char *end; + int err = 0; + V9fsPath new_path; + V9fsFidState *tfidp; + V9fsState *s = pdu->s; + V9fsFidState *dirfidp = NULL; + char *old_name, *new_name; + + v9fs_path_init(&new_path); + if (newdirfid != -1) { + dirfidp = get_fid(pdu, newdirfid); + if (dirfidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + BUG_ON(dirfidp->fid_type != P9_FID_NONE); + v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); + } else { + old_name = fidp->path.data; + end = strrchr(old_name, '/'); + if (end) { + end++; + } else { + end = old_name; + } + new_name = g_malloc0(end - old_name + name->size + 1); + strncat(new_name, old_name, end - old_name); + strncat(new_name + (end - old_name), name->data, name->size); + v9fs_co_name_to_path(pdu, NULL, new_name, &new_path); + g_free(new_name); + } + err = v9fs_co_rename(pdu, &fidp->path, &new_path); + if (err < 0) { + goto out; + } + /* + * Fixup fid's pointing to the old name to + * start pointing to the new name + */ + for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { + if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { + /* replace the name */ + v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); + } + } +out: + if (dirfidp) { + put_fid(pdu, dirfidp); + } + v9fs_path_free(&new_path); +out_nofid: + return err; +} + +/* Only works with path name based fid */ +static void v9fs_rename(void *opaque) +{ + int32_t fid; + ssize_t err = 0; + size_t offset = 7; + V9fsString name; + int32_t newdirfid; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); + if (err < 0) { + goto out_nofid; + } + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + BUG_ON(fidp->fid_type != P9_FID_NONE); + /* if fs driver is not path based, return EOPNOTSUPP */ + if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { + err = -EOPNOTSUPP; + goto out; + } + v9fs_path_write_lock(s); + err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); + v9fs_path_unlock(s); + if (!err) { + err = offset; + } +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + +static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, + V9fsString *old_name, V9fsPath *newdir, + V9fsString *new_name) +{ + V9fsFidState *tfidp; + V9fsPath oldpath, newpath; + V9fsState *s = pdu->s; + + + v9fs_path_init(&oldpath); + v9fs_path_init(&newpath); + v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); + v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); + + /* + * Fixup fid's pointing to the old name to + * start pointing to the new name + */ + for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { + if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { + /* replace the name */ + v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); + } + } + v9fs_path_free(&oldpath); + v9fs_path_free(&newpath); +} + +static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, + V9fsString *old_name, int32_t newdirfid, + V9fsString *new_name) +{ + int err = 0; + V9fsState *s = pdu->s; + V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; + + olddirfidp = get_fid(pdu, olddirfid); + if (olddirfidp == NULL) { + err = -ENOENT; + goto out; + } + if (newdirfid != -1) { + newdirfidp = get_fid(pdu, newdirfid); + if (newdirfidp == NULL) { + err = -ENOENT; + goto out; + } + } else { + newdirfidp = get_fid(pdu, olddirfid); + } + + err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, + &newdirfidp->path, new_name); + if (err < 0) { + goto out; + } + if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { + /* Only for path based fid we need to do the below fixup */ + v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, + &newdirfidp->path, new_name); + } +out: + if (olddirfidp) { + put_fid(pdu, olddirfidp); + } + if (newdirfidp) { + put_fid(pdu, newdirfidp); + } + return err; +} + +static void v9fs_renameat(void *opaque) +{ + ssize_t err = 0; + size_t offset = 7; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + int32_t olddirfid, newdirfid; + V9fsString old_name, new_name; + + v9fs_string_init(&old_name); + v9fs_string_init(&new_name); + err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, + &old_name, &newdirfid, &new_name); + if (err < 0) { + goto out_err; + } + + v9fs_path_write_lock(s); + err = v9fs_complete_renameat(pdu, olddirfid, + &old_name, newdirfid, &new_name); + v9fs_path_unlock(s); + if (!err) { + err = offset; + } + +out_err: + pdu_complete(pdu, err); + v9fs_string_free(&old_name); + v9fs_string_free(&new_name); +} + +static void v9fs_wstat(void *opaque) +{ + int32_t fid; + int err = 0; + int16_t unused; + V9fsStat v9stat; + size_t offset = 7; + struct stat stbuf; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + + v9fs_stat_init(&v9stat); + err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_wstat(pdu->tag, pdu->id, fid, + v9stat.mode, v9stat.atime, v9stat.mtime); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + /* do we need to sync the file? */ + if (donttouch_stat(&v9stat)) { + err = v9fs_co_fsync(pdu, fidp, 0); + goto out; + } + if (v9stat.mode != -1) { + uint32_t v9_mode; + err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); + if (err < 0) { + goto out; + } + v9_mode = stat_to_v9mode(&stbuf); + if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != + (v9_mode & P9_STAT_MODE_TYPE_BITS)) { + /* Attempting to change the type */ + err = -EIO; + goto out; + } + err = v9fs_co_chmod(pdu, &fidp->path, + v9mode_to_mode(v9stat.mode, + &v9stat.extension)); + if (err < 0) { + goto out; + } + } + if (v9stat.mtime != -1 || v9stat.atime != -1) { + struct timespec times[2]; + if (v9stat.atime != -1) { + times[0].tv_sec = v9stat.atime; + times[0].tv_nsec = 0; + } else { + times[0].tv_nsec = UTIME_OMIT; + } + if (v9stat.mtime != -1) { + times[1].tv_sec = v9stat.mtime; + times[1].tv_nsec = 0; + } else { + times[1].tv_nsec = UTIME_OMIT; + } + err = v9fs_co_utimensat(pdu, &fidp->path, times); + if (err < 0) { + goto out; + } + } + if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { + err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); + if (err < 0) { + goto out; + } + } + if (v9stat.name.size != 0) { + err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); + if (err < 0) { + goto out; + } + } + if (v9stat.length != -1) { + err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); + if (err < 0) { + goto out; + } + } + err = offset; +out: + put_fid(pdu, fidp); +out_nofid: + v9fs_stat_free(&v9stat); + pdu_complete(pdu, err); +} + +static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) +{ + uint32_t f_type; + uint32_t f_bsize; + uint64_t f_blocks; + uint64_t f_bfree; + uint64_t f_bavail; + uint64_t f_files; + uint64_t f_ffree; + uint64_t fsid_val; + uint32_t f_namelen; + size_t offset = 7; + int32_t bsize_factor; + + /* + * compute bsize factor based on host file system block size + * and client msize + */ + bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize; + if (!bsize_factor) { + bsize_factor = 1; + } + f_type = stbuf->f_type; + f_bsize = stbuf->f_bsize; + f_bsize *= bsize_factor; + /* + * f_bsize is adjusted(multiplied) by bsize factor, so we need to + * adjust(divide) the number of blocks, free blocks and available + * blocks by bsize factor + */ + f_blocks = stbuf->f_blocks/bsize_factor; + f_bfree = stbuf->f_bfree/bsize_factor; + f_bavail = stbuf->f_bavail/bsize_factor; + f_files = stbuf->f_files; + f_ffree = stbuf->f_ffree; + fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | + (unsigned long long)stbuf->f_fsid.__val[1] << 32; + f_namelen = stbuf->f_namelen; + + return pdu_marshal(pdu, offset, "ddqqqqqqd", + f_type, f_bsize, f_blocks, f_bfree, + f_bavail, f_files, f_ffree, + fsid_val, f_namelen); +} + +static void v9fs_statfs(void *opaque) +{ + int32_t fid; + ssize_t retval = 0; + size_t offset = 7; + V9fsFidState *fidp; + struct statfs stbuf; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + retval = pdu_unmarshal(pdu, offset, "d", &fid); + if (retval < 0) { + goto out_nofid; + } + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + retval = -ENOENT; + goto out_nofid; + } + retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); + if (retval < 0) { + goto out; + } + retval = v9fs_fill_statfs(s, pdu, &stbuf); + if (retval < 0) { + goto out; + } + retval += offset; +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, retval); +} + +static void v9fs_mknod(void *opaque) +{ + + int mode; + gid_t gid; + int32_t fid; + V9fsQID qid; + int err = 0; + int major, minor; + size_t offset = 7; + V9fsString name; + struct stat stbuf; + V9fsFidState *fidp; + V9fsPDU *pdu = opaque; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, + &major, &minor, &gid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, + makedev(major, minor), mode, &stbuf); + if (err < 0) { + goto out; + } + stat_to_qid(&stbuf, &qid); + err = pdu_marshal(pdu, offset, "Q", &qid); + if (err < 0) { + goto out; + } + err += offset; + trace_v9fs_mknod_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + +/* + * Implement posix byte range locking code + * Server side handling of locking code is very simple, because 9p server in + * QEMU can handle only one client. And most of the lock handling + * (like conflict, merging) etc is done by the VFS layer itself, so no need to + * do any thing in * qemu 9p server side lock code path. + * So when a TLOCK request comes, always return success + */ +static void v9fs_lock(void *opaque) +{ + int8_t status; + V9fsFlock flock; + size_t offset = 7; + struct stat stbuf; + V9fsFidState *fidp; + int32_t fid, err = 0; + V9fsPDU *pdu = opaque; + + status = P9_LOCK_ERROR; + v9fs_string_init(&flock.client_id); + err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, + &flock.flags, &flock.start, &flock.length, + &flock.proc_id, &flock.client_id); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_lock(pdu->tag, pdu->id, fid, + flock.type, flock.start, flock.length); + + + /* We support only block flag now (that too ignored currently) */ + if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { + err = -EINVAL; + goto out_nofid; + } + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + err = v9fs_co_fstat(pdu, fidp, &stbuf); + if (err < 0) { + goto out; + } + status = P9_LOCK_SUCCESS; +out: + put_fid(pdu, fidp); +out_nofid: + err = pdu_marshal(pdu, offset, "b", status); + if (err > 0) { + err += offset; + } + trace_v9fs_lock_return(pdu->tag, pdu->id, status); + pdu_complete(pdu, err); + v9fs_string_free(&flock.client_id); +} + +/* + * When a TGETLOCK request comes, always return success because all lock + * handling is done by client's VFS layer. + */ +static void v9fs_getlock(void *opaque) +{ + size_t offset = 7; + struct stat stbuf; + V9fsFidState *fidp; + V9fsGetlock glock; + int32_t fid, err = 0; + V9fsPDU *pdu = opaque; + + v9fs_string_init(&glock.client_id); + err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, + &glock.start, &glock.length, &glock.proc_id, + &glock.client_id); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_getlock(pdu->tag, pdu->id, fid, + glock.type, glock.start, glock.length); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + err = v9fs_co_fstat(pdu, fidp, &stbuf); + if (err < 0) { + goto out; + } + glock.type = P9_LOCK_TYPE_UNLCK; + err = pdu_marshal(pdu, offset, "bqqds", glock.type, + glock.start, glock.length, glock.proc_id, + &glock.client_id); + if (err < 0) { + goto out; + } + err += offset; + trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, + glock.length, glock.proc_id); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&glock.client_id); +} + +static void v9fs_mkdir(void *opaque) +{ + V9fsPDU *pdu = opaque; + size_t offset = 7; + int32_t fid; + struct stat stbuf; + V9fsQID qid; + V9fsString name; + V9fsFidState *fidp; + gid_t gid; + int mode; + int err = 0; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); + if (err < 0) { + goto out; + } + stat_to_qid(&stbuf, &qid); + err = pdu_marshal(pdu, offset, "Q", &qid); + if (err < 0) { + goto out; + } + err += offset; + trace_v9fs_mkdir_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path, err); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + +static void v9fs_xattrwalk(void *opaque) +{ + int64_t size; + V9fsString name; + ssize_t err = 0; + size_t offset = 7; + int32_t fid, newfid; + V9fsFidState *file_fidp; + V9fsFidState *xattr_fidp = NULL; + V9fsPDU *pdu = opaque; + V9fsState *s = pdu->s; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); + + file_fidp = get_fid(pdu, fid); + if (file_fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + xattr_fidp = alloc_fid(s, newfid); + if (xattr_fidp == NULL) { + err = -EINVAL; + goto out; + } + v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); + if (name.data == NULL) { + /* + * listxattr request. Get the size first + */ + size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); + if (size < 0) { + err = size; + clunk_fid(s, xattr_fidp->fid); + goto out; + } + /* + * Read the xattr value + */ + xattr_fidp->fs.xattr.len = size; + xattr_fidp->fid_type = P9_FID_XATTR; + xattr_fidp->fs.xattr.copied_len = -1; + if (size) { + xattr_fidp->fs.xattr.value = g_malloc(size); + err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, + xattr_fidp->fs.xattr.value, + xattr_fidp->fs.xattr.len); + if (err < 0) { + clunk_fid(s, xattr_fidp->fid); + goto out; + } + } + err = pdu_marshal(pdu, offset, "q", size); + if (err < 0) { + goto out; + } + err += offset; + } else { + /* + * specific xattr fid. We check for xattr + * presence also collect the xattr size + */ + size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, + &name, NULL, 0); + if (size < 0) { + err = size; + clunk_fid(s, xattr_fidp->fid); + goto out; + } + /* + * Read the xattr value + */ + xattr_fidp->fs.xattr.len = size; + xattr_fidp->fid_type = P9_FID_XATTR; + xattr_fidp->fs.xattr.copied_len = -1; + if (size) { + xattr_fidp->fs.xattr.value = g_malloc(size); + err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, + &name, xattr_fidp->fs.xattr.value, + xattr_fidp->fs.xattr.len); + if (err < 0) { + clunk_fid(s, xattr_fidp->fid); + goto out; + } + } + err = pdu_marshal(pdu, offset, "q", size); + if (err < 0) { + goto out; + } + err += offset; + } + trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); +out: + put_fid(pdu, file_fidp); + if (xattr_fidp) { + put_fid(pdu, xattr_fidp); + } +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + +static void v9fs_xattrcreate(void *opaque) +{ + int flags; + int32_t fid; + int64_t size; + ssize_t err = 0; + V9fsString name; + size_t offset = 7; + V9fsFidState *file_fidp; + V9fsFidState *xattr_fidp; + V9fsPDU *pdu = opaque; + + v9fs_string_init(&name); + err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); + + file_fidp = get_fid(pdu, fid); + if (file_fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + /* Make the file fid point to xattr */ + xattr_fidp = file_fidp; + xattr_fidp->fid_type = P9_FID_XATTR; + xattr_fidp->fs.xattr.copied_len = 0; + xattr_fidp->fs.xattr.len = size; + xattr_fidp->fs.xattr.flags = flags; + v9fs_string_init(&xattr_fidp->fs.xattr.name); + v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); + xattr_fidp->fs.xattr.value = g_malloc(size); + err = offset; + put_fid(pdu, file_fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + +static void v9fs_readlink(void *opaque) +{ + V9fsPDU *pdu = opaque; + size_t offset = 7; + V9fsString target; + int32_t fid; + int err = 0; + V9fsFidState *fidp; + + err = pdu_unmarshal(pdu, offset, "d", &fid); + if (err < 0) { + goto out_nofid; + } + trace_v9fs_readlink(pdu->tag, pdu->id, fid); + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + + v9fs_string_init(&target); + err = v9fs_co_readlink(pdu, &fidp->path, &target); + if (err < 0) { + goto out; + } + err = pdu_marshal(pdu, offset, "s", &target); + if (err < 0) { + v9fs_string_free(&target); + goto out; + } + err += offset; + trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); + v9fs_string_free(&target); +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); +} + +static CoroutineEntry *pdu_co_handlers[] = { + [P9_TREADDIR] = v9fs_readdir, + [P9_TSTATFS] = v9fs_statfs, + [P9_TGETATTR] = v9fs_getattr, + [P9_TSETATTR] = v9fs_setattr, + [P9_TXATTRWALK] = v9fs_xattrwalk, + [P9_TXATTRCREATE] = v9fs_xattrcreate, + [P9_TMKNOD] = v9fs_mknod, + [P9_TRENAME] = v9fs_rename, + [P9_TLOCK] = v9fs_lock, + [P9_TGETLOCK] = v9fs_getlock, + [P9_TRENAMEAT] = v9fs_renameat, + [P9_TREADLINK] = v9fs_readlink, + [P9_TUNLINKAT] = v9fs_unlinkat, + [P9_TMKDIR] = v9fs_mkdir, + [P9_TVERSION] = v9fs_version, + [P9_TLOPEN] = v9fs_open, + [P9_TATTACH] = v9fs_attach, + [P9_TSTAT] = v9fs_stat, + [P9_TWALK] = v9fs_walk, + [P9_TCLUNK] = v9fs_clunk, + [P9_TFSYNC] = v9fs_fsync, + [P9_TOPEN] = v9fs_open, + [P9_TREAD] = v9fs_read, +#if 0 + [P9_TAUTH] = v9fs_auth, +#endif + [P9_TFLUSH] = v9fs_flush, + [P9_TLINK] = v9fs_link, + [P9_TSYMLINK] = v9fs_symlink, + [P9_TCREATE] = v9fs_create, + [P9_TLCREATE] = v9fs_lcreate, + [P9_TWRITE] = v9fs_write, + [P9_TWSTAT] = v9fs_wstat, + [P9_TREMOVE] = v9fs_remove, +}; + +static void v9fs_op_not_supp(void *opaque) +{ + V9fsPDU *pdu = opaque; + pdu_complete(pdu, -EOPNOTSUPP); +} + +static void v9fs_fs_ro(void *opaque) +{ + V9fsPDU *pdu = opaque; + pdu_complete(pdu, -EROFS); +} + +static inline bool is_read_only_op(V9fsPDU *pdu) +{ + switch (pdu->id) { + case P9_TREADDIR: + case P9_TSTATFS: + case P9_TGETATTR: + case P9_TXATTRWALK: + case P9_TLOCK: + case P9_TGETLOCK: + case P9_TREADLINK: + case P9_TVERSION: + case P9_TLOPEN: + case P9_TATTACH: + case P9_TSTAT: + case P9_TWALK: + case P9_TCLUNK: + case P9_TFSYNC: + case P9_TOPEN: + case P9_TREAD: + case P9_TAUTH: + case P9_TFLUSH: + return 1; + default: + return 0; + } +} + +void pdu_submit(V9fsPDU *pdu) +{ + Coroutine *co; + CoroutineEntry *handler; + V9fsState *s = pdu->s; + + if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || + (pdu_co_handlers[pdu->id] == NULL)) { + handler = v9fs_op_not_supp; + } else { + handler = pdu_co_handlers[pdu->id]; + } + + if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { + handler = v9fs_fs_ro; + } + co = qemu_coroutine_create(handler); + qemu_coroutine_enter(co, pdu); +} + +static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) +{ + struct rlimit rlim; + if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { + fprintf(stderr, "Failed to get the resource limit\n"); + exit(1); + } + open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3); + open_fd_rc = rlim.rlim_cur/2; +} diff --git a/hw/9pfs/Makefile.objs b/hw/9pfs/Makefile.objs index d5778728d5..fcffefe373 100644 --- a/hw/9pfs/Makefile.objs +++ b/hw/9pfs/Makefile.objs @@ -1,4 +1,4 @@ -common-obj-y = virtio-9p.o +common-obj-y = 9p.o common-obj-y += 9p-local.o 9p-xattr.o common-obj-y += 9p-xattr-user.o 9p-posix-acl.o common-obj-y += virtio-9p-coth.o cofs.o codir.o cofile.o diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c deleted file mode 100644 index ad9d3f0f29..0000000000 --- a/hw/9pfs/virtio-9p.c +++ /dev/null @@ -1,3276 +0,0 @@ -/* - * Virtio 9p backend - * - * Copyright IBM, Corp. 2010 - * - * Authors: - * Anthony Liguori <aliguori@us.ibm.com> - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - * - */ - -#include "hw/virtio/virtio.h" -#include "hw/i386/pc.h" -#include "qemu/sockets.h" -#include "virtio-9p.h" -#include "fsdev/qemu-fsdev.h" -#include "9p-xattr.h" -#include "virtio-9p-coth.h" -#include "trace.h" -#include "migration/migration.h" - -int open_fd_hw; -int total_open_fd; -static int open_fd_rc; - -enum { - Oread = 0x00, - Owrite = 0x01, - Ordwr = 0x02, - Oexec = 0x03, - Oexcl = 0x04, - Otrunc = 0x10, - Orexec = 0x20, - Orclose = 0x40, - Oappend = 0x80, -}; - -ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) -{ - ssize_t ret; - va_list ap; - - va_start(ap, fmt); - ret = virtio_pdu_vmarshal(pdu, offset, fmt, ap); - va_end(ap); - - return ret; -} - -ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) -{ - ssize_t ret; - va_list ap; - - va_start(ap, fmt); - ret = virtio_pdu_vunmarshal(pdu, offset, fmt, ap); - va_end(ap); - - return ret; -} - -static void pdu_push_and_notify(V9fsPDU *pdu) -{ - virtio_9p_push_and_notify(pdu); -} - -static int omode_to_uflags(int8_t mode) -{ - int ret = 0; - - switch (mode & 3) { - case Oread: - ret = O_RDONLY; - break; - case Ordwr: - ret = O_RDWR; - break; - case Owrite: - ret = O_WRONLY; - break; - case Oexec: - ret = O_RDONLY; - break; - } - - if (mode & Otrunc) { - ret |= O_TRUNC; - } - - if (mode & Oappend) { - ret |= O_APPEND; - } - - if (mode & Oexcl) { - ret |= O_EXCL; - } - - return ret; -} - -struct dotl_openflag_map { - int dotl_flag; - int open_flag; -}; - -static int dotl_to_open_flags(int flags) -{ - int i; - /* - * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY - * and P9_DOTL_NOACCESS - */ - int oflags = flags & O_ACCMODE; - - struct dotl_openflag_map dotl_oflag_map[] = { - { P9_DOTL_CREATE, O_CREAT }, - { P9_DOTL_EXCL, O_EXCL }, - { P9_DOTL_NOCTTY , O_NOCTTY }, - { P9_DOTL_TRUNC, O_TRUNC }, - { P9_DOTL_APPEND, O_APPEND }, - { P9_DOTL_NONBLOCK, O_NONBLOCK } , - { P9_DOTL_DSYNC, O_DSYNC }, - { P9_DOTL_FASYNC, FASYNC }, - { P9_DOTL_DIRECT, O_DIRECT }, - { P9_DOTL_LARGEFILE, O_LARGEFILE }, - { P9_DOTL_DIRECTORY, O_DIRECTORY }, - { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, - { P9_DOTL_NOATIME, O_NOATIME }, - { P9_DOTL_SYNC, O_SYNC }, - }; - - for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { - if (flags & dotl_oflag_map[i].dotl_flag) { - oflags |= dotl_oflag_map[i].open_flag; - } - } - - return oflags; -} - -void cred_init(FsCred *credp) -{ - credp->fc_uid = -1; - credp->fc_gid = -1; - credp->fc_mode = -1; - credp->fc_rdev = -1; -} - -static int get_dotl_openflags(V9fsState *s, int oflags) -{ - int flags; - /* - * Filter the client open flags - */ - flags = dotl_to_open_flags(oflags); - flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); - /* - * Ignore direct disk access hint until the server supports it. - */ - flags &= ~O_DIRECT; - return flags; -} - -void v9fs_path_init(V9fsPath *path) -{ - path->data = NULL; - path->size = 0; -} - -void v9fs_path_free(V9fsPath *path) -{ - g_free(path->data); - path->data = NULL; - path->size = 0; -} - -void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs) -{ - v9fs_path_free(lhs); - lhs->data = g_malloc(rhs->size); - memcpy(lhs->data, rhs->data, rhs->size); - lhs->size = rhs->size; -} - -int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, - const char *name, V9fsPath *path) -{ - int err; - err = s->ops->name_to_path(&s->ctx, dirpath, name, path); - if (err < 0) { - err = -errno; - } - return err; -} - -/* - * Return TRUE if s1 is an ancestor of s2. - * - * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". - * As a special case, We treat s1 as ancestor of s2 if they are same! - */ -static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) -{ - if (!strncmp(s1->data, s2->data, s1->size - 1)) { - if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { - return 1; - } - } - return 0; -} - -static size_t v9fs_string_size(V9fsString *str) -{ - return str->size; -} - -/* - * returns 0 if fid got re-opened, 1 if not, < 0 on error */ -static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) -{ - int err = 1; - if (f->fid_type == P9_FID_FILE) { - if (f->fs.fd == -1) { - do { - err = v9fs_co_open(pdu, f, f->open_flags); - } while (err == -EINTR && !pdu->cancelled); - } - } else if (f->fid_type == P9_FID_DIR) { - if (f->fs.dir == NULL) { - do { - err = v9fs_co_opendir(pdu, f); - } while (err == -EINTR && !pdu->cancelled); - } - } - return err; -} - -static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid) -{ - int err; - V9fsFidState *f; - V9fsState *s = pdu->s; - - for (f = s->fid_list; f; f = f->next) { - BUG_ON(f->clunked); - if (f->fid == fid) { - /* - * Update the fid ref upfront so that - * we don't get reclaimed when we yield - * in open later. - */ - f->ref++; - /* - * check whether we need to reopen the - * file. We might have closed the fd - * while trying to free up some file - * descriptors. - */ - err = v9fs_reopen_fid(pdu, f); - if (err < 0) { - f->ref--; - return NULL; - } - /* - * Mark the fid as referenced so that the LRU - * reclaim won't close the file descriptor - */ - f->flags |= FID_REFERENCED; - return f; - } - } - return NULL; -} - -static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) -{ - V9fsFidState *f; - - for (f = s->fid_list; f; f = f->next) { - /* If fid is already there return NULL */ - BUG_ON(f->clunked); - if (f->fid == fid) { - return NULL; - } - } - f = g_malloc0(sizeof(V9fsFidState)); - f->fid = fid; - f->fid_type = P9_FID_NONE; - f->ref = 1; - /* - * Mark the fid as referenced so that the LRU - * reclaim won't close the file descriptor - */ - f->flags |= FID_REFERENCED; - f->next = s->fid_list; - s->fid_list = f; - - return f; -} - -static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) -{ - int retval = 0; - - if (fidp->fs.xattr.copied_len == -1) { - /* getxattr/listxattr fid */ - goto free_value; - } - /* - * if this is fid for setxattr. clunk should - * result in setxattr localcall - */ - if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { - /* clunk after partial write */ - retval = -EINVAL; - goto free_out; - } - if (fidp->fs.xattr.len) { - retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, - fidp->fs.xattr.value, - fidp->fs.xattr.len, - fidp->fs.xattr.flags); - } else { - retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); - } -free_out: - v9fs_string_free(&fidp->fs.xattr.name); -free_value: - g_free(fidp->fs.xattr.value); - return retval; -} - -static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp) -{ - int retval = 0; - - if (fidp->fid_type == P9_FID_FILE) { - /* If we reclaimed the fd no need to close */ - if (fidp->fs.fd != -1) { - retval = v9fs_co_close(pdu, &fidp->fs); - } - } else if (fidp->fid_type == P9_FID_DIR) { - if (fidp->fs.dir != NULL) { - retval = v9fs_co_closedir(pdu, &fidp->fs); - } - } else if (fidp->fid_type == P9_FID_XATTR) { - retval = v9fs_xattr_fid_clunk(pdu, fidp); - } - v9fs_path_free(&fidp->path); - g_free(fidp); - return retval; -} - -static int put_fid(V9fsPDU *pdu, V9fsFidState *fidp) -{ - BUG_ON(!fidp->ref); - fidp->ref--; - /* - * Don't free the fid if it is in reclaim list - */ - if (!fidp->ref && fidp->clunked) { - if (fidp->fid == pdu->s->root_fid) { - /* - * if the clunked fid is root fid then we - * have unmounted the fs on the client side. - * delete the migration blocker. Ideally, this - * should be hooked to transport close notification - */ - if (pdu->s->migration_blocker) { - migrate_del_blocker(pdu->s->migration_blocker); - error_free(pdu->s->migration_blocker); - pdu->s->migration_blocker = NULL; - } - } - return free_fid(pdu, fidp); - } - return 0; -} - -static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) -{ - V9fsFidState **fidpp, *fidp; - - for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { - if ((*fidpp)->fid == fid) { - break; - } - } - if (*fidpp == NULL) { - return NULL; - } - fidp = *fidpp; - *fidpp = fidp->next; - fidp->clunked = 1; - return fidp; -} - -void v9fs_reclaim_fd(V9fsPDU *pdu) -{ - int reclaim_count = 0; - V9fsState *s = pdu->s; - V9fsFidState *f, *reclaim_list = NULL; - - for (f = s->fid_list; f; f = f->next) { - /* - * Unlink fids cannot be reclaimed. Check - * for them and skip them. Also skip fids - * currently being operated on. - */ - if (f->ref || f->flags & FID_NON_RECLAIMABLE) { - continue; - } - /* - * if it is a recently referenced fid - * we leave the fid untouched and clear the - * reference bit. We come back to it later - * in the next iteration. (a simple LRU without - * moving list elements around) - */ - if (f->flags & FID_REFERENCED) { - f->flags &= ~FID_REFERENCED; - continue; - } - /* - * Add fids to reclaim list. - */ - if (f->fid_type == P9_FID_FILE) { - if (f->fs.fd != -1) { - /* - * Up the reference count so that - * a clunk request won't free this fid - */ - f->ref++; - f->rclm_lst = reclaim_list; - reclaim_list = f; - f->fs_reclaim.fd = f->fs.fd; - f->fs.fd = -1; - reclaim_count++; - } - } else if (f->fid_type == P9_FID_DIR) { - if (f->fs.dir != NULL) { - /* - * Up the reference count so that - * a clunk request won't free this fid - */ - f->ref++; - f->rclm_lst = reclaim_list; - reclaim_list = f; - f->fs_reclaim.dir = f->fs.dir; - f->fs.dir = NULL; - reclaim_count++; - } - } - if (reclaim_count >= open_fd_rc) { - break; - } - } - /* - * Now close the fid in reclaim list. Free them if they - * are already clunked. - */ - while (reclaim_list) { - f = reclaim_list; - reclaim_list = f->rclm_lst; - if (f->fid_type == P9_FID_FILE) { - v9fs_co_close(pdu, &f->fs_reclaim); - } else if (f->fid_type == P9_FID_DIR) { - v9fs_co_closedir(pdu, &f->fs_reclaim); - } - f->rclm_lst = NULL; - /* - * Now drop the fid reference, free it - * if clunked. - */ - put_fid(pdu, f); - } -} - -static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) -{ - int err; - V9fsState *s = pdu->s; - V9fsFidState *fidp, head_fid; - - head_fid.next = s->fid_list; - for (fidp = s->fid_list; fidp; fidp = fidp->next) { - if (fidp->path.size != path->size) { - continue; - } - if (!memcmp(fidp->path.data, path->data, path->size)) { - /* Mark the fid non reclaimable. */ - fidp->flags |= FID_NON_RECLAIMABLE; - - /* reopen the file/dir if already closed */ - err = v9fs_reopen_fid(pdu, fidp); - if (err < 0) { - return -1; - } - /* - * Go back to head of fid list because - * the list could have got updated when - * switched to the worker thread - */ - if (err == 0) { - fidp = &head_fid; - } - } - } - return 0; -} - -static void virtfs_reset(V9fsPDU *pdu) -{ - V9fsState *s = pdu->s; - V9fsFidState *fidp = NULL; - - /* Free all fids */ - while (s->fid_list) { - fidp = s->fid_list; - s->fid_list = fidp->next; - - if (fidp->ref) { - fidp->clunked = 1; - } else { - free_fid(pdu, fidp); - } - } - if (fidp) { - /* One or more unclunked fids found... */ - error_report("9pfs:%s: One or more uncluncked fids " - "found during reset", __func__); - } -} - -#define P9_QID_TYPE_DIR 0x80 -#define P9_QID_TYPE_SYMLINK 0x02 - -#define P9_STAT_MODE_DIR 0x80000000 -#define P9_STAT_MODE_APPEND 0x40000000 -#define P9_STAT_MODE_EXCL 0x20000000 -#define P9_STAT_MODE_MOUNT 0x10000000 -#define P9_STAT_MODE_AUTH 0x08000000 -#define P9_STAT_MODE_TMP 0x04000000 -#define P9_STAT_MODE_SYMLINK 0x02000000 -#define P9_STAT_MODE_LINK 0x01000000 -#define P9_STAT_MODE_DEVICE 0x00800000 -#define P9_STAT_MODE_NAMED_PIPE 0x00200000 -#define P9_STAT_MODE_SOCKET 0x00100000 -#define P9_STAT_MODE_SETUID 0x00080000 -#define P9_STAT_MODE_SETGID 0x00040000 -#define P9_STAT_MODE_SETVTX 0x00010000 - -#define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ - P9_STAT_MODE_SYMLINK | \ - P9_STAT_MODE_LINK | \ - P9_STAT_MODE_DEVICE | \ - P9_STAT_MODE_NAMED_PIPE | \ - P9_STAT_MODE_SOCKET) - -/* This is the algorithm from ufs in spfs */ -static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) -{ - size_t size; - - memset(&qidp->path, 0, sizeof(qidp->path)); - size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); - memcpy(&qidp->path, &stbuf->st_ino, size); - qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); - qidp->type = 0; - if (S_ISDIR(stbuf->st_mode)) { - qidp->type |= P9_QID_TYPE_DIR; - } - if (S_ISLNK(stbuf->st_mode)) { - qidp->type |= P9_QID_TYPE_SYMLINK; - } -} - -static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp) -{ - struct stat stbuf; - int err; - - err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); - if (err < 0) { - return err; - } - stat_to_qid(&stbuf, qidp); - return 0; -} - -V9fsPDU *pdu_alloc(V9fsState *s) -{ - V9fsPDU *pdu = NULL; - - if (!QLIST_EMPTY(&s->free_list)) { - pdu = QLIST_FIRST(&s->free_list); - QLIST_REMOVE(pdu, next); - QLIST_INSERT_HEAD(&s->active_list, pdu, next); - } - return pdu; -} - -void pdu_free(V9fsPDU *pdu) -{ - if (pdu) { - V9fsState *s = pdu->s; - /* - * Cancelled pdu are added back to the freelist - * by flush request . - */ - if (!pdu->cancelled) { - QLIST_REMOVE(pdu, next); - QLIST_INSERT_HEAD(&s->free_list, pdu, next); - } - } -} - -/* - * We don't do error checking for pdu_marshal/unmarshal here - * because we always expect to have enough space to encode - * error details - */ -static void pdu_complete(V9fsPDU *pdu, ssize_t len) -{ - int8_t id = pdu->id + 1; /* Response */ - V9fsState *s = pdu->s; - - if (len < 0) { - int err = -len; - len = 7; - - if (s->proto_version != V9FS_PROTO_2000L) { - V9fsString str; - - str.data = strerror(err); - str.size = strlen(str.data); - - len += pdu_marshal(pdu, len, "s", &str); - id = P9_RERROR; - } - - len += pdu_marshal(pdu, len, "d", err); - - if (s->proto_version == V9FS_PROTO_2000L) { - id = P9_RLERROR; - } - trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ - } - - /* fill out the header */ - pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); - - /* keep these in sync */ - pdu->size = len; - pdu->id = id; - - pdu_push_and_notify(pdu); - - /* Now wakeup anybody waiting in flush for this request */ - qemu_co_queue_next(&pdu->complete); - - pdu_free(pdu); -} - -static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) -{ - mode_t ret; - - ret = mode & 0777; - if (mode & P9_STAT_MODE_DIR) { - ret |= S_IFDIR; - } - - if (mode & P9_STAT_MODE_SYMLINK) { - ret |= S_IFLNK; - } - if (mode & P9_STAT_MODE_SOCKET) { - ret |= S_IFSOCK; - } - if (mode & P9_STAT_MODE_NAMED_PIPE) { - ret |= S_IFIFO; - } - if (mode & P9_STAT_MODE_DEVICE) { - if (extension->size && extension->data[0] == 'c') { - ret |= S_IFCHR; - } else { - ret |= S_IFBLK; - } - } - - if (!(ret&~0777)) { - ret |= S_IFREG; - } - - if (mode & P9_STAT_MODE_SETUID) { - ret |= S_ISUID; - } - if (mode & P9_STAT_MODE_SETGID) { - ret |= S_ISGID; - } - if (mode & P9_STAT_MODE_SETVTX) { - ret |= S_ISVTX; - } - - return ret; -} - -static int donttouch_stat(V9fsStat *stat) -{ - if (stat->type == -1 && - stat->dev == -1 && - stat->qid.type == -1 && - stat->qid.version == -1 && - stat->qid.path == -1 && - stat->mode == -1 && - stat->atime == -1 && - stat->mtime == -1 && - stat->length == -1 && - !stat->name.size && - !stat->uid.size && - !stat->gid.size && - !stat->muid.size && - stat->n_uid == -1 && - stat->n_gid == -1 && - stat->n_muid == -1) { - return 1; - } - - return 0; -} - -static void v9fs_stat_init(V9fsStat *stat) -{ - v9fs_string_init(&stat->name); - v9fs_string_init(&stat->uid); - v9fs_string_init(&stat->gid); - v9fs_string_init(&stat->muid); - v9fs_string_init(&stat->extension); -} - -static void v9fs_stat_free(V9fsStat *stat) -{ - v9fs_string_free(&stat->name); - v9fs_string_free(&stat->uid); - v9fs_string_free(&stat->gid); - v9fs_string_free(&stat->muid); - v9fs_string_free(&stat->extension); -} - -static uint32_t stat_to_v9mode(const struct stat *stbuf) -{ - uint32_t mode; - - mode = stbuf->st_mode & 0777; - if (S_ISDIR(stbuf->st_mode)) { - mode |= P9_STAT_MODE_DIR; - } - - if (S_ISLNK(stbuf->st_mode)) { - mode |= P9_STAT_MODE_SYMLINK; - } - - if (S_ISSOCK(stbuf->st_mode)) { - mode |= P9_STAT_MODE_SOCKET; - } - - if (S_ISFIFO(stbuf->st_mode)) { - mode |= P9_STAT_MODE_NAMED_PIPE; - } - - if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { - mode |= P9_STAT_MODE_DEVICE; - } - - if (stbuf->st_mode & S_ISUID) { - mode |= P9_STAT_MODE_SETUID; - } - - if (stbuf->st_mode & S_ISGID) { - mode |= P9_STAT_MODE_SETGID; - } - - if (stbuf->st_mode & S_ISVTX) { - mode |= P9_STAT_MODE_SETVTX; - } - - return mode; -} - -static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name, - const struct stat *stbuf, - V9fsStat *v9stat) -{ - int err; - const char *str; - - memset(v9stat, 0, sizeof(*v9stat)); - - stat_to_qid(stbuf, &v9stat->qid); - v9stat->mode = stat_to_v9mode(stbuf); - v9stat->atime = stbuf->st_atime; - v9stat->mtime = stbuf->st_mtime; - v9stat->length = stbuf->st_size; - - v9fs_string_null(&v9stat->uid); - v9fs_string_null(&v9stat->gid); - v9fs_string_null(&v9stat->muid); - - v9stat->n_uid = stbuf->st_uid; - v9stat->n_gid = stbuf->st_gid; - v9stat->n_muid = 0; - - v9fs_string_null(&v9stat->extension); - - if (v9stat->mode & P9_STAT_MODE_SYMLINK) { - err = v9fs_co_readlink(pdu, name, &v9stat->extension); - if (err < 0) { - return err; - } - } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { - v9fs_string_sprintf(&v9stat->extension, "%c %u %u", - S_ISCHR(stbuf->st_mode) ? 'c' : 'b', - major(stbuf->st_rdev), minor(stbuf->st_rdev)); - } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { - v9fs_string_sprintf(&v9stat->extension, "%s %lu", - "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); - } - - str = strrchr(name->data, '/'); - if (str) { - str += 1; - } else { - str = name->data; - } - - v9fs_string_sprintf(&v9stat->name, "%s", str); - - v9stat->size = 61 + - v9fs_string_size(&v9stat->name) + - v9fs_string_size(&v9stat->uid) + - v9fs_string_size(&v9stat->gid) + - v9fs_string_size(&v9stat->muid) + - v9fs_string_size(&v9stat->extension); - return 0; -} - -#define P9_STATS_MODE 0x00000001ULL -#define P9_STATS_NLINK 0x00000002ULL -#define P9_STATS_UID 0x00000004ULL -#define P9_STATS_GID 0x00000008ULL -#define P9_STATS_RDEV 0x00000010ULL -#define P9_STATS_ATIME 0x00000020ULL -#define P9_STATS_MTIME 0x00000040ULL -#define P9_STATS_CTIME 0x00000080ULL -#define P9_STATS_INO 0x00000100ULL -#define P9_STATS_SIZE 0x00000200ULL -#define P9_STATS_BLOCKS 0x00000400ULL - -#define P9_STATS_BTIME 0x00000800ULL -#define P9_STATS_GEN 0x00001000ULL -#define P9_STATS_DATA_VERSION 0x00002000ULL - -#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ -#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ - - -static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf, - V9fsStatDotl *v9lstat) -{ - memset(v9lstat, 0, sizeof(*v9lstat)); - - v9lstat->st_mode = stbuf->st_mode; - v9lstat->st_nlink = stbuf->st_nlink; - v9lstat->st_uid = stbuf->st_uid; - v9lstat->st_gid = stbuf->st_gid; - v9lstat->st_rdev = stbuf->st_rdev; - v9lstat->st_size = stbuf->st_size; - v9lstat->st_blksize = stbuf->st_blksize; - v9lstat->st_blocks = stbuf->st_blocks; - v9lstat->st_atime_sec = stbuf->st_atime; - v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; - v9lstat->st_mtime_sec = stbuf->st_mtime; - v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; - v9lstat->st_ctime_sec = stbuf->st_ctime; - v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; - /* Currently we only support BASIC fields in stat */ - v9lstat->st_result_mask = P9_STATS_BASIC; - - stat_to_qid(stbuf, &v9lstat->qid); -} - -static void print_sg(struct iovec *sg, int cnt) -{ - int i; - - printf("sg[%d]: {", cnt); - for (i = 0; i < cnt; i++) { - if (i) { - printf(", "); - } - printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); - } - printf("}\n"); -} - -/* Will call this only for path name based fid */ -static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) -{ - V9fsPath str; - v9fs_path_init(&str); - v9fs_path_copy(&str, dst); - v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len); - v9fs_path_free(&str); - /* +1 to include terminating NULL */ - dst->size++; -} - -static inline bool is_ro_export(FsContext *ctx) -{ - return ctx->export_flags & V9FS_RDONLY; -} - -static void v9fs_version(void *opaque) -{ - ssize_t err; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - V9fsString version; - size_t offset = 7; - - v9fs_string_init(&version); - err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); - if (err < 0) { - offset = err; - goto out; - } - trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); - - virtfs_reset(pdu); - - if (!strcmp(version.data, "9P2000.u")) { - s->proto_version = V9FS_PROTO_2000U; - } else if (!strcmp(version.data, "9P2000.L")) { - s->proto_version = V9FS_PROTO_2000L; - } else { - v9fs_string_sprintf(&version, "unknown"); - } - - err = pdu_marshal(pdu, offset, "ds", s->msize, &version); - if (err < 0) { - offset = err; - goto out; - } - offset += err; - trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); -out: - pdu_complete(pdu, offset); - v9fs_string_free(&version); -} - -static void v9fs_attach(void *opaque) -{ - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - int32_t fid, afid, n_uname; - V9fsString uname, aname; - V9fsFidState *fidp; - size_t offset = 7; - V9fsQID qid; - ssize_t err; - - v9fs_string_init(&uname); - v9fs_string_init(&aname); - err = pdu_unmarshal(pdu, offset, "ddssd", &fid, - &afid, &uname, &aname, &n_uname); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); - - fidp = alloc_fid(s, fid); - if (fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - fidp->uid = n_uname; - err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); - if (err < 0) { - err = -EINVAL; - clunk_fid(s, fid); - goto out; - } - err = fid_to_qid(pdu, fidp, &qid); - if (err < 0) { - err = -EINVAL; - clunk_fid(s, fid); - goto out; - } - err = pdu_marshal(pdu, offset, "Q", &qid); - if (err < 0) { - clunk_fid(s, fid); - goto out; - } - err += offset; - trace_v9fs_attach_return(pdu->tag, pdu->id, - qid.type, qid.version, qid.path); - /* - * disable migration if we haven't done already. - * attach could get called multiple times for the same export. - */ - if (!s->migration_blocker) { - s->root_fid = fid; - error_setg(&s->migration_blocker, - "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", - s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); - migrate_add_blocker(s->migration_blocker); - } -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&uname); - v9fs_string_free(&aname); -} - -static void v9fs_stat(void *opaque) -{ - int32_t fid; - V9fsStat v9stat; - ssize_t err = 0; - size_t offset = 7; - struct stat stbuf; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - - err = pdu_unmarshal(pdu, offset, "d", &fid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_stat(pdu->tag, pdu->id, fid); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); - if (err < 0) { - goto out; - } - err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat); - if (err < 0) { - goto out; - } - err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); - if (err < 0) { - v9fs_stat_free(&v9stat); - goto out; - } - trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, - v9stat.atime, v9stat.mtime, v9stat.length); - err += offset; - v9fs_stat_free(&v9stat); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); -} - -static void v9fs_getattr(void *opaque) -{ - int32_t fid; - size_t offset = 7; - ssize_t retval = 0; - struct stat stbuf; - V9fsFidState *fidp; - uint64_t request_mask; - V9fsStatDotl v9stat_dotl; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); - if (retval < 0) { - goto out_nofid; - } - trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - retval = -ENOENT; - goto out_nofid; - } - /* - * Currently we only support BASIC fields in stat, so there is no - * need to look at request_mask. - */ - retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); - if (retval < 0) { - goto out; - } - stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl); - - /* fill st_gen if requested and supported by underlying fs */ - if (request_mask & P9_STATS_GEN) { - retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); - switch (retval) { - case 0: - /* we have valid st_gen: update result mask */ - v9stat_dotl.st_result_mask |= P9_STATS_GEN; - break; - case -EINTR: - /* request cancelled, e.g. by Tflush */ - goto out; - default: - /* failed to get st_gen: not fatal, ignore */ - break; - } - } - retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); - if (retval < 0) { - goto out; - } - retval += offset; - trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, - v9stat_dotl.st_mode, v9stat_dotl.st_uid, - v9stat_dotl.st_gid); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, retval); -} - -/* Attribute flags */ -#define P9_ATTR_MODE (1 << 0) -#define P9_ATTR_UID (1 << 1) -#define P9_ATTR_GID (1 << 2) -#define P9_ATTR_SIZE (1 << 3) -#define P9_ATTR_ATIME (1 << 4) -#define P9_ATTR_MTIME (1 << 5) -#define P9_ATTR_CTIME (1 << 6) -#define P9_ATTR_ATIME_SET (1 << 7) -#define P9_ATTR_MTIME_SET (1 << 8) - -#define P9_ATTR_MASK 127 - -static void v9fs_setattr(void *opaque) -{ - int err = 0; - int32_t fid; - V9fsFidState *fidp; - size_t offset = 7; - V9fsIattr v9iattr; - V9fsPDU *pdu = opaque; - - err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); - if (err < 0) { - goto out_nofid; - } - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - if (v9iattr.valid & P9_ATTR_MODE) { - err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); - if (err < 0) { - goto out; - } - } - if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { - struct timespec times[2]; - if (v9iattr.valid & P9_ATTR_ATIME) { - if (v9iattr.valid & P9_ATTR_ATIME_SET) { - times[0].tv_sec = v9iattr.atime_sec; - times[0].tv_nsec = v9iattr.atime_nsec; - } else { - times[0].tv_nsec = UTIME_NOW; - } - } else { - times[0].tv_nsec = UTIME_OMIT; - } - if (v9iattr.valid & P9_ATTR_MTIME) { - if (v9iattr.valid & P9_ATTR_MTIME_SET) { - times[1].tv_sec = v9iattr.mtime_sec; - times[1].tv_nsec = v9iattr.mtime_nsec; - } else { - times[1].tv_nsec = UTIME_NOW; - } - } else { - times[1].tv_nsec = UTIME_OMIT; - } - err = v9fs_co_utimensat(pdu, &fidp->path, times); - if (err < 0) { - goto out; - } - } - /* - * If the only valid entry in iattr is ctime we can call - * chown(-1,-1) to update the ctime of the file - */ - if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || - ((v9iattr.valid & P9_ATTR_CTIME) - && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { - if (!(v9iattr.valid & P9_ATTR_UID)) { - v9iattr.uid = -1; - } - if (!(v9iattr.valid & P9_ATTR_GID)) { - v9iattr.gid = -1; - } - err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, - v9iattr.gid); - if (err < 0) { - goto out; - } - } - if (v9iattr.valid & (P9_ATTR_SIZE)) { - err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); - if (err < 0) { - goto out; - } - } - err = offset; -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); -} - -static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) -{ - int i; - ssize_t err; - size_t offset = 7; - - err = pdu_marshal(pdu, offset, "w", nwnames); - if (err < 0) { - return err; - } - offset += err; - for (i = 0; i < nwnames; i++) { - err = pdu_marshal(pdu, offset, "Q", &qids[i]); - if (err < 0) { - return err; - } - offset += err; - } - return offset; -} - -static void v9fs_walk(void *opaque) -{ - int name_idx; - V9fsQID *qids = NULL; - int i, err = 0; - V9fsPath dpath, path; - uint16_t nwnames; - struct stat stbuf; - size_t offset = 7; - int32_t fid, newfid; - V9fsString *wnames = NULL; - V9fsFidState *fidp; - V9fsFidState *newfidp = NULL; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); - if (err < 0) { - pdu_complete(pdu, err); - return ; - } - offset += err; - - trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); - - if (nwnames && nwnames <= P9_MAXWELEM) { - wnames = g_malloc0(sizeof(wnames[0]) * nwnames); - qids = g_malloc0(sizeof(qids[0]) * nwnames); - for (i = 0; i < nwnames; i++) { - err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); - if (err < 0) { - goto out_nofid; - } - offset += err; - } - } else if (nwnames > P9_MAXWELEM) { - err = -EINVAL; - goto out_nofid; - } - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - v9fs_path_init(&dpath); - v9fs_path_init(&path); - /* - * Both dpath and path initially poin to fidp. - * Needed to handle request with nwnames == 0 - */ - v9fs_path_copy(&dpath, &fidp->path); - v9fs_path_copy(&path, &fidp->path); - for (name_idx = 0; name_idx < nwnames; name_idx++) { - err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, &path); - if (err < 0) { - goto out; - } - err = v9fs_co_lstat(pdu, &path, &stbuf); - if (err < 0) { - goto out; - } - stat_to_qid(&stbuf, &qids[name_idx]); - v9fs_path_copy(&dpath, &path); - } - if (fid == newfid) { - BUG_ON(fidp->fid_type != P9_FID_NONE); - v9fs_path_copy(&fidp->path, &path); - } else { - newfidp = alloc_fid(s, newfid); - if (newfidp == NULL) { - err = -EINVAL; - goto out; - } - newfidp->uid = fidp->uid; - v9fs_path_copy(&newfidp->path, &path); - } - err = v9fs_walk_marshal(pdu, nwnames, qids); - trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); -out: - put_fid(pdu, fidp); - if (newfidp) { - put_fid(pdu, newfidp); - } - v9fs_path_free(&dpath); - v9fs_path_free(&path); -out_nofid: - pdu_complete(pdu, err); - if (nwnames && nwnames <= P9_MAXWELEM) { - for (name_idx = 0; name_idx < nwnames; name_idx++) { - v9fs_string_free(&wnames[name_idx]); - } - g_free(wnames); - g_free(qids); - } -} - -static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path) -{ - struct statfs stbuf; - int32_t iounit = 0; - V9fsState *s = pdu->s; - - /* - * iounit should be multiples of f_bsize (host filesystem block size - * and as well as less than (client msize - P9_IOHDRSZ)) - */ - if (!v9fs_co_statfs(pdu, path, &stbuf)) { - iounit = stbuf.f_bsize; - iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize; - } - if (!iounit) { - iounit = s->msize - P9_IOHDRSZ; - } - return iounit; -} - -static void v9fs_open(void *opaque) -{ - int flags; - int32_t fid; - int32_t mode; - V9fsQID qid; - int iounit = 0; - ssize_t err = 0; - size_t offset = 7; - struct stat stbuf; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - if (s->proto_version == V9FS_PROTO_2000L) { - err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); - } else { - uint8_t modebyte; - err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); - mode = modebyte; - } - if (err < 0) { - goto out_nofid; - } - trace_v9fs_open(pdu->tag, pdu->id, fid, mode); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - BUG_ON(fidp->fid_type != P9_FID_NONE); - - err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); - if (err < 0) { - goto out; - } - stat_to_qid(&stbuf, &qid); - if (S_ISDIR(stbuf.st_mode)) { - err = v9fs_co_opendir(pdu, fidp); - if (err < 0) { - goto out; - } - fidp->fid_type = P9_FID_DIR; - err = pdu_marshal(pdu, offset, "Qd", &qid, 0); - if (err < 0) { - goto out; - } - err += offset; - } else { - if (s->proto_version == V9FS_PROTO_2000L) { - flags = get_dotl_openflags(s, mode); - } else { - flags = omode_to_uflags(mode); - } - if (is_ro_export(&s->ctx)) { - if (mode & O_WRONLY || mode & O_RDWR || - mode & O_APPEND || mode & O_TRUNC) { - err = -EROFS; - goto out; - } - } - err = v9fs_co_open(pdu, fidp, flags); - if (err < 0) { - goto out; - } - fidp->fid_type = P9_FID_FILE; - fidp->open_flags = flags; - if (flags & O_EXCL) { - /* - * We let the host file system do O_EXCL check - * We should not reclaim such fd - */ - fidp->flags |= FID_NON_RECLAIMABLE; - } - iounit = get_iounit(pdu, &fidp->path); - err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); - if (err < 0) { - goto out; - } - err += offset; - } - trace_v9fs_open_return(pdu->tag, pdu->id, - qid.type, qid.version, qid.path, iounit); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); -} - -static void v9fs_lcreate(void *opaque) -{ - int32_t dfid, flags, mode; - gid_t gid; - ssize_t err = 0; - ssize_t offset = 7; - V9fsString name; - V9fsFidState *fidp; - struct stat stbuf; - V9fsQID qid; - int32_t iounit; - V9fsPDU *pdu = opaque; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, - &name, &flags, &mode, &gid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); - - fidp = get_fid(pdu, dfid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - - flags = get_dotl_openflags(pdu->s, flags); - err = v9fs_co_open2(pdu, fidp, &name, gid, - flags | O_CREAT, mode, &stbuf); - if (err < 0) { - goto out; - } - fidp->fid_type = P9_FID_FILE; - fidp->open_flags = flags; - if (flags & O_EXCL) { - /* - * We let the host file system do O_EXCL check - * We should not reclaim such fd - */ - fidp->flags |= FID_NON_RECLAIMABLE; - } - iounit = get_iounit(pdu, &fidp->path); - stat_to_qid(&stbuf, &qid); - err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); - if (err < 0) { - goto out; - } - err += offset; - trace_v9fs_lcreate_return(pdu->tag, pdu->id, - qid.type, qid.version, qid.path, iounit); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); -} - -static void v9fs_fsync(void *opaque) -{ - int err; - int32_t fid; - int datasync; - size_t offset = 7; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - - err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - err = v9fs_co_fsync(pdu, fidp, datasync); - if (!err) { - err = offset; - } - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); -} - -static void v9fs_clunk(void *opaque) -{ - int err; - int32_t fid; - size_t offset = 7; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - err = pdu_unmarshal(pdu, offset, "d", &fid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_clunk(pdu->tag, pdu->id, fid); - - fidp = clunk_fid(s, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - /* - * Bump the ref so that put_fid will - * free the fid. - */ - fidp->ref++; - err = put_fid(pdu, fidp); - if (!err) { - err = offset; - } -out_nofid: - pdu_complete(pdu, err); -} - -static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, - uint64_t off, uint32_t max_count) -{ - ssize_t err; - size_t offset = 7; - int read_count; - int64_t xattr_len; - - xattr_len = fidp->fs.xattr.len; - read_count = xattr_len - off; - if (read_count > max_count) { - read_count = max_count; - } else if (read_count < 0) { - /* - * read beyond XATTR value - */ - read_count = 0; - } - err = pdu_marshal(pdu, offset, "d", read_count); - if (err < 0) { - return err; - } - offset += err; - err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset, - ((char *)fidp->fs.xattr.value) + off, - read_count); - if (err < 0) { - return err; - } - offset += err; - return offset; -} - -static int v9fs_do_readdir_with_stat(V9fsPDU *pdu, - V9fsFidState *fidp, uint32_t max_count) -{ - V9fsPath path; - V9fsStat v9stat; - int len, err = 0; - int32_t count = 0; - struct stat stbuf; - off_t saved_dir_pos; - struct dirent *dent, *result; - - /* save the directory position */ - saved_dir_pos = v9fs_co_telldir(pdu, fidp); - if (saved_dir_pos < 0) { - return saved_dir_pos; - } - - dent = g_malloc(sizeof(struct dirent)); - - while (1) { - v9fs_path_init(&path); - err = v9fs_co_readdir_r(pdu, fidp, dent, &result); - if (err || !result) { - break; - } - err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); - if (err < 0) { - goto out; - } - err = v9fs_co_lstat(pdu, &path, &stbuf); - if (err < 0) { - goto out; - } - err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat); - if (err < 0) { - goto out; - } - /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ - len = pdu_marshal(pdu, 11 + count, "S", &v9stat); - if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) { - /* Ran out of buffer. Set dir back to old position and return */ - v9fs_co_seekdir(pdu, fidp, saved_dir_pos); - v9fs_stat_free(&v9stat); - v9fs_path_free(&path); - g_free(dent); - return count; - } - count += len; - v9fs_stat_free(&v9stat); - v9fs_path_free(&path); - saved_dir_pos = dent->d_off; - } -out: - g_free(dent); - v9fs_path_free(&path); - if (err < 0) { - return err; - } - return count; -} - -/* - * Create a QEMUIOVector for a sub-region of PDU iovecs - * - * @qiov: uninitialized QEMUIOVector - * @skip: number of bytes to skip from beginning of PDU - * @size: number of bytes to include - * @is_write: true - write, false - read - * - * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up - * with qemu_iovec_destroy(). - */ -static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, - size_t skip, size_t size, - bool is_write) -{ - QEMUIOVector elem; - struct iovec *iov; - unsigned int niov; - - virtio_init_iov_from_pdu(pdu, &iov, &niov, is_write); - - qemu_iovec_init_external(&elem, iov, niov); - qemu_iovec_init(qiov, niov); - qemu_iovec_concat(qiov, &elem, skip, size); -} - -static void v9fs_read(void *opaque) -{ - int32_t fid; - uint64_t off; - ssize_t err = 0; - int32_t count = 0; - size_t offset = 7; - uint32_t max_count; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - if (fidp->fid_type == P9_FID_DIR) { - - if (off == 0) { - v9fs_co_rewinddir(pdu, fidp); - } - count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); - if (count < 0) { - err = count; - goto out; - } - err = pdu_marshal(pdu, offset, "d", count); - if (err < 0) { - goto out; - } - err += offset + count; - } else if (fidp->fid_type == P9_FID_FILE) { - QEMUIOVector qiov_full; - QEMUIOVector qiov; - int32_t len; - - v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); - qemu_iovec_init(&qiov, qiov_full.niov); - do { - qemu_iovec_reset(&qiov); - qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); - if (0) { - print_sg(qiov.iov, qiov.niov); - } - /* Loop in case of EINTR */ - do { - len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); - if (len >= 0) { - off += len; - count += len; - } - } while (len == -EINTR && !pdu->cancelled); - if (len < 0) { - /* IO error return the error */ - err = len; - goto out; - } - } while (count < max_count && len > 0); - err = pdu_marshal(pdu, offset, "d", count); - if (err < 0) { - goto out; - } - err += offset + count; - qemu_iovec_destroy(&qiov); - qemu_iovec_destroy(&qiov_full); - } else if (fidp->fid_type == P9_FID_XATTR) { - err = v9fs_xattr_read(s, pdu, fidp, off, max_count); - } else { - err = -EINVAL; - } - trace_v9fs_read_return(pdu->tag, pdu->id, count, err); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); -} - -static size_t v9fs_readdir_data_size(V9fsString *name) -{ - /* - * Size of each dirent on the wire: size of qid (13) + size of offset (8) - * size of type (1) + size of name.size (2) + strlen(name.data) - */ - return 24 + v9fs_string_size(name); -} - -static int v9fs_do_readdir(V9fsPDU *pdu, - V9fsFidState *fidp, int32_t max_count) -{ - size_t size; - V9fsQID qid; - V9fsString name; - int len, err = 0; - int32_t count = 0; - off_t saved_dir_pos; - struct dirent *dent, *result; - - /* save the directory position */ - saved_dir_pos = v9fs_co_telldir(pdu, fidp); - if (saved_dir_pos < 0) { - return saved_dir_pos; - } - - dent = g_malloc(sizeof(struct dirent)); - - while (1) { - err = v9fs_co_readdir_r(pdu, fidp, dent, &result); - if (err || !result) { - break; - } - v9fs_string_init(&name); - v9fs_string_sprintf(&name, "%s", dent->d_name); - if ((count + v9fs_readdir_data_size(&name)) > max_count) { - /* Ran out of buffer. Set dir back to old position and return */ - v9fs_co_seekdir(pdu, fidp, saved_dir_pos); - v9fs_string_free(&name); - g_free(dent); - return count; - } - /* - * Fill up just the path field of qid because the client uses - * only that. To fill the entire qid structure we will have - * to stat each dirent found, which is expensive - */ - size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); - memcpy(&qid.path, &dent->d_ino, size); - /* Fill the other fields with dummy values */ - qid.type = 0; - qid.version = 0; - - /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ - len = pdu_marshal(pdu, 11 + count, "Qqbs", - &qid, dent->d_off, - dent->d_type, &name); - if (len < 0) { - v9fs_co_seekdir(pdu, fidp, saved_dir_pos); - v9fs_string_free(&name); - g_free(dent); - return len; - } - count += len; - v9fs_string_free(&name); - saved_dir_pos = dent->d_off; - } - g_free(dent); - if (err < 0) { - return err; - } - return count; -} - -static void v9fs_readdir(void *opaque) -{ - int32_t fid; - V9fsFidState *fidp; - ssize_t retval = 0; - size_t offset = 7; - uint64_t initial_offset; - int32_t count; - uint32_t max_count; - V9fsPDU *pdu = opaque; - - retval = pdu_unmarshal(pdu, offset, "dqd", &fid, - &initial_offset, &max_count); - if (retval < 0) { - goto out_nofid; - } - trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - retval = -EINVAL; - goto out_nofid; - } - if (!fidp->fs.dir) { - retval = -EINVAL; - goto out; - } - if (initial_offset == 0) { - v9fs_co_rewinddir(pdu, fidp); - } else { - v9fs_co_seekdir(pdu, fidp, initial_offset); - } - count = v9fs_do_readdir(pdu, fidp, max_count); - if (count < 0) { - retval = count; - goto out; - } - retval = pdu_marshal(pdu, offset, "d", count); - if (retval < 0) { - goto out; - } - retval += count + offset; - trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, retval); -} - -static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, - uint64_t off, uint32_t count, - struct iovec *sg, int cnt) -{ - int i, to_copy; - ssize_t err = 0; - int write_count; - int64_t xattr_len; - size_t offset = 7; - - - xattr_len = fidp->fs.xattr.len; - write_count = xattr_len - off; - if (write_count > count) { - write_count = count; - } else if (write_count < 0) { - /* - * write beyond XATTR value len specified in - * xattrcreate - */ - err = -ENOSPC; - goto out; - } - err = pdu_marshal(pdu, offset, "d", write_count); - if (err < 0) { - return err; - } - err += offset; - fidp->fs.xattr.copied_len += write_count; - /* - * Now copy the content from sg list - */ - for (i = 0; i < cnt; i++) { - if (write_count > sg[i].iov_len) { - to_copy = sg[i].iov_len; - } else { - to_copy = write_count; - } - memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); - /* updating vs->off since we are not using below */ - off += to_copy; - write_count -= to_copy; - } -out: - return err; -} - -static void v9fs_write(void *opaque) -{ - ssize_t err; - int32_t fid; - uint64_t off; - uint32_t count; - int32_t len = 0; - int32_t total = 0; - size_t offset = 7; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - QEMUIOVector qiov_full; - QEMUIOVector qiov; - - err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); - if (err < 0) { - pdu_complete(pdu, err); - return; - } - offset += err; - v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); - trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - if (fidp->fid_type == P9_FID_FILE) { - if (fidp->fs.fd == -1) { - err = -EINVAL; - goto out; - } - } else if (fidp->fid_type == P9_FID_XATTR) { - /* - * setxattr operation - */ - err = v9fs_xattr_write(s, pdu, fidp, off, count, - qiov_full.iov, qiov_full.niov); - goto out; - } else { - err = -EINVAL; - goto out; - } - qemu_iovec_init(&qiov, qiov_full.niov); - do { - qemu_iovec_reset(&qiov); - qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); - if (0) { - print_sg(qiov.iov, qiov.niov); - } - /* Loop in case of EINTR */ - do { - len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); - if (len >= 0) { - off += len; - total += len; - } - } while (len == -EINTR && !pdu->cancelled); - if (len < 0) { - /* IO error return the error */ - err = len; - goto out_qiov; - } - } while (total < count && len > 0); - - offset = 7; - err = pdu_marshal(pdu, offset, "d", total); - if (err < 0) { - goto out; - } - err += offset; - trace_v9fs_write_return(pdu->tag, pdu->id, total, err); -out_qiov: - qemu_iovec_destroy(&qiov); -out: - put_fid(pdu, fidp); -out_nofid: - qemu_iovec_destroy(&qiov_full); - pdu_complete(pdu, err); -} - -static void v9fs_create(void *opaque) -{ - int32_t fid; - int err = 0; - size_t offset = 7; - V9fsFidState *fidp; - V9fsQID qid; - int32_t perm; - int8_t mode; - V9fsPath path; - struct stat stbuf; - V9fsString name; - V9fsString extension; - int iounit; - V9fsPDU *pdu = opaque; - - v9fs_path_init(&path); - v9fs_string_init(&name); - v9fs_string_init(&extension); - err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, - &perm, &mode, &extension); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - if (perm & P9_STAT_MODE_DIR) { - err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, - fidp->uid, -1, &stbuf); - if (err < 0) { - goto out; - } - err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); - if (err < 0) { - goto out; - } - v9fs_path_copy(&fidp->path, &path); - err = v9fs_co_opendir(pdu, fidp); - if (err < 0) { - goto out; - } - fidp->fid_type = P9_FID_DIR; - } else if (perm & P9_STAT_MODE_SYMLINK) { - err = v9fs_co_symlink(pdu, fidp, &name, - extension.data, -1 , &stbuf); - if (err < 0) { - goto out; - } - err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); - if (err < 0) { - goto out; - } - v9fs_path_copy(&fidp->path, &path); - } else if (perm & P9_STAT_MODE_LINK) { - int32_t ofid = atoi(extension.data); - V9fsFidState *ofidp = get_fid(pdu, ofid); - if (ofidp == NULL) { - err = -EINVAL; - goto out; - } - err = v9fs_co_link(pdu, ofidp, fidp, &name); - put_fid(pdu, ofidp); - if (err < 0) { - goto out; - } - err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); - if (err < 0) { - fidp->fid_type = P9_FID_NONE; - goto out; - } - v9fs_path_copy(&fidp->path, &path); - err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); - if (err < 0) { - fidp->fid_type = P9_FID_NONE; - goto out; - } - } else if (perm & P9_STAT_MODE_DEVICE) { - char ctype; - uint32_t major, minor; - mode_t nmode = 0; - - if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { - err = -errno; - goto out; - } - - switch (ctype) { - case 'c': - nmode = S_IFCHR; - break; - case 'b': - nmode = S_IFBLK; - break; - default: - err = -EIO; - goto out; - } - - nmode |= perm & 0777; - err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, - makedev(major, minor), nmode, &stbuf); - if (err < 0) { - goto out; - } - err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); - if (err < 0) { - goto out; - } - v9fs_path_copy(&fidp->path, &path); - } else if (perm & P9_STAT_MODE_NAMED_PIPE) { - err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, - 0, S_IFIFO | (perm & 0777), &stbuf); - if (err < 0) { - goto out; - } - err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); - if (err < 0) { - goto out; - } - v9fs_path_copy(&fidp->path, &path); - } else if (perm & P9_STAT_MODE_SOCKET) { - err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, - 0, S_IFSOCK | (perm & 0777), &stbuf); - if (err < 0) { - goto out; - } - err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); - if (err < 0) { - goto out; - } - v9fs_path_copy(&fidp->path, &path); - } else { - err = v9fs_co_open2(pdu, fidp, &name, -1, - omode_to_uflags(mode)|O_CREAT, perm, &stbuf); - if (err < 0) { - goto out; - } - fidp->fid_type = P9_FID_FILE; - fidp->open_flags = omode_to_uflags(mode); - if (fidp->open_flags & O_EXCL) { - /* - * We let the host file system do O_EXCL check - * We should not reclaim such fd - */ - fidp->flags |= FID_NON_RECLAIMABLE; - } - } - iounit = get_iounit(pdu, &fidp->path); - stat_to_qid(&stbuf, &qid); - err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); - if (err < 0) { - goto out; - } - err += offset; - trace_v9fs_create_return(pdu->tag, pdu->id, - qid.type, qid.version, qid.path, iounit); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); - v9fs_string_free(&extension); - v9fs_path_free(&path); -} - -static void v9fs_symlink(void *opaque) -{ - V9fsPDU *pdu = opaque; - V9fsString name; - V9fsString symname; - V9fsFidState *dfidp; - V9fsQID qid; - struct stat stbuf; - int32_t dfid; - int err = 0; - gid_t gid; - size_t offset = 7; - - v9fs_string_init(&name); - v9fs_string_init(&symname); - err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); - - dfidp = get_fid(pdu, dfid); - if (dfidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); - if (err < 0) { - goto out; - } - stat_to_qid(&stbuf, &qid); - err = pdu_marshal(pdu, offset, "Q", &qid); - if (err < 0) { - goto out; - } - err += offset; - trace_v9fs_symlink_return(pdu->tag, pdu->id, - qid.type, qid.version, qid.path); -out: - put_fid(pdu, dfidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); - v9fs_string_free(&symname); -} - -static void v9fs_flush(void *opaque) -{ - ssize_t err; - int16_t tag; - size_t offset = 7; - V9fsPDU *cancel_pdu; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - err = pdu_unmarshal(pdu, offset, "w", &tag); - if (err < 0) { - pdu_complete(pdu, err); - return; - } - trace_v9fs_flush(pdu->tag, pdu->id, tag); - - QLIST_FOREACH(cancel_pdu, &s->active_list, next) { - if (cancel_pdu->tag == tag) { - break; - } - } - if (cancel_pdu) { - cancel_pdu->cancelled = 1; - /* - * Wait for pdu to complete. - */ - qemu_co_queue_wait(&cancel_pdu->complete); - cancel_pdu->cancelled = 0; - pdu_free(cancel_pdu); - } - pdu_complete(pdu, 7); -} - -static void v9fs_link(void *opaque) -{ - V9fsPDU *pdu = opaque; - int32_t dfid, oldfid; - V9fsFidState *dfidp, *oldfidp; - V9fsString name; - size_t offset = 7; - int err = 0; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); - - dfidp = get_fid(pdu, dfid); - if (dfidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - - oldfidp = get_fid(pdu, oldfid); - if (oldfidp == NULL) { - err = -ENOENT; - goto out; - } - err = v9fs_co_link(pdu, oldfidp, dfidp, &name); - if (!err) { - err = offset; - } -out: - put_fid(pdu, dfidp); -out_nofid: - v9fs_string_free(&name); - pdu_complete(pdu, err); -} - -/* Only works with path name based fid */ -static void v9fs_remove(void *opaque) -{ - int32_t fid; - int err = 0; - size_t offset = 7; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - - err = pdu_unmarshal(pdu, offset, "d", &fid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_remove(pdu->tag, pdu->id, fid); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - /* if fs driver is not path based, return EOPNOTSUPP */ - if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { - err = -EOPNOTSUPP; - goto out_err; - } - /* - * IF the file is unlinked, we cannot reopen - * the file later. So don't reclaim fd - */ - err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); - if (err < 0) { - goto out_err; - } - err = v9fs_co_remove(pdu, &fidp->path); - if (!err) { - err = offset; - } -out_err: - /* For TREMOVE we need to clunk the fid even on failed remove */ - clunk_fid(pdu->s, fidp->fid); - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); -} - -static void v9fs_unlinkat(void *opaque) -{ - int err = 0; - V9fsString name; - int32_t dfid, flags; - size_t offset = 7; - V9fsPath path; - V9fsFidState *dfidp; - V9fsPDU *pdu = opaque; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); - if (err < 0) { - goto out_nofid; - } - dfidp = get_fid(pdu, dfid); - if (dfidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - /* - * IF the file is unlinked, we cannot reopen - * the file later. So don't reclaim fd - */ - v9fs_path_init(&path); - err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); - if (err < 0) { - goto out_err; - } - err = v9fs_mark_fids_unreclaim(pdu, &path); - if (err < 0) { - goto out_err; - } - err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags); - if (!err) { - err = offset; - } -out_err: - put_fid(pdu, dfidp); - v9fs_path_free(&path); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); -} - - -/* Only works with path name based fid */ -static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, - int32_t newdirfid, V9fsString *name) -{ - char *end; - int err = 0; - V9fsPath new_path; - V9fsFidState *tfidp; - V9fsState *s = pdu->s; - V9fsFidState *dirfidp = NULL; - char *old_name, *new_name; - - v9fs_path_init(&new_path); - if (newdirfid != -1) { - dirfidp = get_fid(pdu, newdirfid); - if (dirfidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - BUG_ON(dirfidp->fid_type != P9_FID_NONE); - v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); - } else { - old_name = fidp->path.data; - end = strrchr(old_name, '/'); - if (end) { - end++; - } else { - end = old_name; - } - new_name = g_malloc0(end - old_name + name->size + 1); - strncat(new_name, old_name, end - old_name); - strncat(new_name + (end - old_name), name->data, name->size); - v9fs_co_name_to_path(pdu, NULL, new_name, &new_path); - g_free(new_name); - } - err = v9fs_co_rename(pdu, &fidp->path, &new_path); - if (err < 0) { - goto out; - } - /* - * Fixup fid's pointing to the old name to - * start pointing to the new name - */ - for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { - if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { - /* replace the name */ - v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); - } - } -out: - if (dirfidp) { - put_fid(pdu, dirfidp); - } - v9fs_path_free(&new_path); -out_nofid: - return err; -} - -/* Only works with path name based fid */ -static void v9fs_rename(void *opaque) -{ - int32_t fid; - ssize_t err = 0; - size_t offset = 7; - V9fsString name; - int32_t newdirfid; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); - if (err < 0) { - goto out_nofid; - } - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - BUG_ON(fidp->fid_type != P9_FID_NONE); - /* if fs driver is not path based, return EOPNOTSUPP */ - if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { - err = -EOPNOTSUPP; - goto out; - } - v9fs_path_write_lock(s); - err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); - v9fs_path_unlock(s); - if (!err) { - err = offset; - } -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); -} - -static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, - V9fsString *old_name, V9fsPath *newdir, - V9fsString *new_name) -{ - V9fsFidState *tfidp; - V9fsPath oldpath, newpath; - V9fsState *s = pdu->s; - - - v9fs_path_init(&oldpath); - v9fs_path_init(&newpath); - v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); - v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); - - /* - * Fixup fid's pointing to the old name to - * start pointing to the new name - */ - for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { - if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { - /* replace the name */ - v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); - } - } - v9fs_path_free(&oldpath); - v9fs_path_free(&newpath); -} - -static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, - V9fsString *old_name, int32_t newdirfid, - V9fsString *new_name) -{ - int err = 0; - V9fsState *s = pdu->s; - V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; - - olddirfidp = get_fid(pdu, olddirfid); - if (olddirfidp == NULL) { - err = -ENOENT; - goto out; - } - if (newdirfid != -1) { - newdirfidp = get_fid(pdu, newdirfid); - if (newdirfidp == NULL) { - err = -ENOENT; - goto out; - } - } else { - newdirfidp = get_fid(pdu, olddirfid); - } - - err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, - &newdirfidp->path, new_name); - if (err < 0) { - goto out; - } - if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { - /* Only for path based fid we need to do the below fixup */ - v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, - &newdirfidp->path, new_name); - } -out: - if (olddirfidp) { - put_fid(pdu, olddirfidp); - } - if (newdirfidp) { - put_fid(pdu, newdirfidp); - } - return err; -} - -static void v9fs_renameat(void *opaque) -{ - ssize_t err = 0; - size_t offset = 7; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - int32_t olddirfid, newdirfid; - V9fsString old_name, new_name; - - v9fs_string_init(&old_name); - v9fs_string_init(&new_name); - err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, - &old_name, &newdirfid, &new_name); - if (err < 0) { - goto out_err; - } - - v9fs_path_write_lock(s); - err = v9fs_complete_renameat(pdu, olddirfid, - &old_name, newdirfid, &new_name); - v9fs_path_unlock(s); - if (!err) { - err = offset; - } - -out_err: - pdu_complete(pdu, err); - v9fs_string_free(&old_name); - v9fs_string_free(&new_name); -} - -static void v9fs_wstat(void *opaque) -{ - int32_t fid; - int err = 0; - int16_t unused; - V9fsStat v9stat; - size_t offset = 7; - struct stat stbuf; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - - v9fs_stat_init(&v9stat); - err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_wstat(pdu->tag, pdu->id, fid, - v9stat.mode, v9stat.atime, v9stat.mtime); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - /* do we need to sync the file? */ - if (donttouch_stat(&v9stat)) { - err = v9fs_co_fsync(pdu, fidp, 0); - goto out; - } - if (v9stat.mode != -1) { - uint32_t v9_mode; - err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); - if (err < 0) { - goto out; - } - v9_mode = stat_to_v9mode(&stbuf); - if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != - (v9_mode & P9_STAT_MODE_TYPE_BITS)) { - /* Attempting to change the type */ - err = -EIO; - goto out; - } - err = v9fs_co_chmod(pdu, &fidp->path, - v9mode_to_mode(v9stat.mode, - &v9stat.extension)); - if (err < 0) { - goto out; - } - } - if (v9stat.mtime != -1 || v9stat.atime != -1) { - struct timespec times[2]; - if (v9stat.atime != -1) { - times[0].tv_sec = v9stat.atime; - times[0].tv_nsec = 0; - } else { - times[0].tv_nsec = UTIME_OMIT; - } - if (v9stat.mtime != -1) { - times[1].tv_sec = v9stat.mtime; - times[1].tv_nsec = 0; - } else { - times[1].tv_nsec = UTIME_OMIT; - } - err = v9fs_co_utimensat(pdu, &fidp->path, times); - if (err < 0) { - goto out; - } - } - if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { - err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); - if (err < 0) { - goto out; - } - } - if (v9stat.name.size != 0) { - err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); - if (err < 0) { - goto out; - } - } - if (v9stat.length != -1) { - err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); - if (err < 0) { - goto out; - } - } - err = offset; -out: - put_fid(pdu, fidp); -out_nofid: - v9fs_stat_free(&v9stat); - pdu_complete(pdu, err); -} - -static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) -{ - uint32_t f_type; - uint32_t f_bsize; - uint64_t f_blocks; - uint64_t f_bfree; - uint64_t f_bavail; - uint64_t f_files; - uint64_t f_ffree; - uint64_t fsid_val; - uint32_t f_namelen; - size_t offset = 7; - int32_t bsize_factor; - - /* - * compute bsize factor based on host file system block size - * and client msize - */ - bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize; - if (!bsize_factor) { - bsize_factor = 1; - } - f_type = stbuf->f_type; - f_bsize = stbuf->f_bsize; - f_bsize *= bsize_factor; - /* - * f_bsize is adjusted(multiplied) by bsize factor, so we need to - * adjust(divide) the number of blocks, free blocks and available - * blocks by bsize factor - */ - f_blocks = stbuf->f_blocks/bsize_factor; - f_bfree = stbuf->f_bfree/bsize_factor; - f_bavail = stbuf->f_bavail/bsize_factor; - f_files = stbuf->f_files; - f_ffree = stbuf->f_ffree; - fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | - (unsigned long long)stbuf->f_fsid.__val[1] << 32; - f_namelen = stbuf->f_namelen; - - return pdu_marshal(pdu, offset, "ddqqqqqqd", - f_type, f_bsize, f_blocks, f_bfree, - f_bavail, f_files, f_ffree, - fsid_val, f_namelen); -} - -static void v9fs_statfs(void *opaque) -{ - int32_t fid; - ssize_t retval = 0; - size_t offset = 7; - V9fsFidState *fidp; - struct statfs stbuf; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - retval = pdu_unmarshal(pdu, offset, "d", &fid); - if (retval < 0) { - goto out_nofid; - } - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - retval = -ENOENT; - goto out_nofid; - } - retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); - if (retval < 0) { - goto out; - } - retval = v9fs_fill_statfs(s, pdu, &stbuf); - if (retval < 0) { - goto out; - } - retval += offset; -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, retval); -} - -static void v9fs_mknod(void *opaque) -{ - - int mode; - gid_t gid; - int32_t fid; - V9fsQID qid; - int err = 0; - int major, minor; - size_t offset = 7; - V9fsString name; - struct stat stbuf; - V9fsFidState *fidp; - V9fsPDU *pdu = opaque; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, - &major, &minor, &gid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, - makedev(major, minor), mode, &stbuf); - if (err < 0) { - goto out; - } - stat_to_qid(&stbuf, &qid); - err = pdu_marshal(pdu, offset, "Q", &qid); - if (err < 0) { - goto out; - } - err += offset; - trace_v9fs_mknod_return(pdu->tag, pdu->id, - qid.type, qid.version, qid.path); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); -} - -/* - * Implement posix byte range locking code - * Server side handling of locking code is very simple, because 9p server in - * QEMU can handle only one client. And most of the lock handling - * (like conflict, merging) etc is done by the VFS layer itself, so no need to - * do any thing in * qemu 9p server side lock code path. - * So when a TLOCK request comes, always return success - */ -static void v9fs_lock(void *opaque) -{ - int8_t status; - V9fsFlock flock; - size_t offset = 7; - struct stat stbuf; - V9fsFidState *fidp; - int32_t fid, err = 0; - V9fsPDU *pdu = opaque; - - status = P9_LOCK_ERROR; - v9fs_string_init(&flock.client_id); - err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, - &flock.flags, &flock.start, &flock.length, - &flock.proc_id, &flock.client_id); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_lock(pdu->tag, pdu->id, fid, - flock.type, flock.start, flock.length); - - - /* We support only block flag now (that too ignored currently) */ - if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { - err = -EINVAL; - goto out_nofid; - } - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - err = v9fs_co_fstat(pdu, fidp, &stbuf); - if (err < 0) { - goto out; - } - status = P9_LOCK_SUCCESS; -out: - put_fid(pdu, fidp); -out_nofid: - err = pdu_marshal(pdu, offset, "b", status); - if (err > 0) { - err += offset; - } - trace_v9fs_lock_return(pdu->tag, pdu->id, status); - pdu_complete(pdu, err); - v9fs_string_free(&flock.client_id); -} - -/* - * When a TGETLOCK request comes, always return success because all lock - * handling is done by client's VFS layer. - */ -static void v9fs_getlock(void *opaque) -{ - size_t offset = 7; - struct stat stbuf; - V9fsFidState *fidp; - V9fsGetlock glock; - int32_t fid, err = 0; - V9fsPDU *pdu = opaque; - - v9fs_string_init(&glock.client_id); - err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, - &glock.start, &glock.length, &glock.proc_id, - &glock.client_id); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_getlock(pdu->tag, pdu->id, fid, - glock.type, glock.start, glock.length); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - err = v9fs_co_fstat(pdu, fidp, &stbuf); - if (err < 0) { - goto out; - } - glock.type = P9_LOCK_TYPE_UNLCK; - err = pdu_marshal(pdu, offset, "bqqds", glock.type, - glock.start, glock.length, glock.proc_id, - &glock.client_id); - if (err < 0) { - goto out; - } - err += offset; - trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, - glock.length, glock.proc_id); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&glock.client_id); -} - -static void v9fs_mkdir(void *opaque) -{ - V9fsPDU *pdu = opaque; - size_t offset = 7; - int32_t fid; - struct stat stbuf; - V9fsQID qid; - V9fsString name; - V9fsFidState *fidp; - gid_t gid; - int mode; - int err = 0; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); - - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); - if (err < 0) { - goto out; - } - stat_to_qid(&stbuf, &qid); - err = pdu_marshal(pdu, offset, "Q", &qid); - if (err < 0) { - goto out; - } - err += offset; - trace_v9fs_mkdir_return(pdu->tag, pdu->id, - qid.type, qid.version, qid.path, err); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); -} - -static void v9fs_xattrwalk(void *opaque) -{ - int64_t size; - V9fsString name; - ssize_t err = 0; - size_t offset = 7; - int32_t fid, newfid; - V9fsFidState *file_fidp; - V9fsFidState *xattr_fidp = NULL; - V9fsPDU *pdu = opaque; - V9fsState *s = pdu->s; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); - - file_fidp = get_fid(pdu, fid); - if (file_fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - xattr_fidp = alloc_fid(s, newfid); - if (xattr_fidp == NULL) { - err = -EINVAL; - goto out; - } - v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); - if (name.data == NULL) { - /* - * listxattr request. Get the size first - */ - size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); - if (size < 0) { - err = size; - clunk_fid(s, xattr_fidp->fid); - goto out; - } - /* - * Read the xattr value - */ - xattr_fidp->fs.xattr.len = size; - xattr_fidp->fid_type = P9_FID_XATTR; - xattr_fidp->fs.xattr.copied_len = -1; - if (size) { - xattr_fidp->fs.xattr.value = g_malloc(size); - err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, - xattr_fidp->fs.xattr.value, - xattr_fidp->fs.xattr.len); - if (err < 0) { - clunk_fid(s, xattr_fidp->fid); - goto out; - } - } - err = pdu_marshal(pdu, offset, "q", size); - if (err < 0) { - goto out; - } - err += offset; - } else { - /* - * specific xattr fid. We check for xattr - * presence also collect the xattr size - */ - size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, - &name, NULL, 0); - if (size < 0) { - err = size; - clunk_fid(s, xattr_fidp->fid); - goto out; - } - /* - * Read the xattr value - */ - xattr_fidp->fs.xattr.len = size; - xattr_fidp->fid_type = P9_FID_XATTR; - xattr_fidp->fs.xattr.copied_len = -1; - if (size) { - xattr_fidp->fs.xattr.value = g_malloc(size); - err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, - &name, xattr_fidp->fs.xattr.value, - xattr_fidp->fs.xattr.len); - if (err < 0) { - clunk_fid(s, xattr_fidp->fid); - goto out; - } - } - err = pdu_marshal(pdu, offset, "q", size); - if (err < 0) { - goto out; - } - err += offset; - } - trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); -out: - put_fid(pdu, file_fidp); - if (xattr_fidp) { - put_fid(pdu, xattr_fidp); - } -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); -} - -static void v9fs_xattrcreate(void *opaque) -{ - int flags; - int32_t fid; - int64_t size; - ssize_t err = 0; - V9fsString name; - size_t offset = 7; - V9fsFidState *file_fidp; - V9fsFidState *xattr_fidp; - V9fsPDU *pdu = opaque; - - v9fs_string_init(&name); - err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); - - file_fidp = get_fid(pdu, fid); - if (file_fidp == NULL) { - err = -EINVAL; - goto out_nofid; - } - /* Make the file fid point to xattr */ - xattr_fidp = file_fidp; - xattr_fidp->fid_type = P9_FID_XATTR; - xattr_fidp->fs.xattr.copied_len = 0; - xattr_fidp->fs.xattr.len = size; - xattr_fidp->fs.xattr.flags = flags; - v9fs_string_init(&xattr_fidp->fs.xattr.name); - v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); - xattr_fidp->fs.xattr.value = g_malloc(size); - err = offset; - put_fid(pdu, file_fidp); -out_nofid: - pdu_complete(pdu, err); - v9fs_string_free(&name); -} - -static void v9fs_readlink(void *opaque) -{ - V9fsPDU *pdu = opaque; - size_t offset = 7; - V9fsString target; - int32_t fid; - int err = 0; - V9fsFidState *fidp; - - err = pdu_unmarshal(pdu, offset, "d", &fid); - if (err < 0) { - goto out_nofid; - } - trace_v9fs_readlink(pdu->tag, pdu->id, fid); - fidp = get_fid(pdu, fid); - if (fidp == NULL) { - err = -ENOENT; - goto out_nofid; - } - - v9fs_string_init(&target); - err = v9fs_co_readlink(pdu, &fidp->path, &target); - if (err < 0) { - goto out; - } - err = pdu_marshal(pdu, offset, "s", &target); - if (err < 0) { - v9fs_string_free(&target); - goto out; - } - err += offset; - trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); - v9fs_string_free(&target); -out: - put_fid(pdu, fidp); -out_nofid: - pdu_complete(pdu, err); -} - -static CoroutineEntry *pdu_co_handlers[] = { - [P9_TREADDIR] = v9fs_readdir, - [P9_TSTATFS] = v9fs_statfs, - [P9_TGETATTR] = v9fs_getattr, - [P9_TSETATTR] = v9fs_setattr, - [P9_TXATTRWALK] = v9fs_xattrwalk, - [P9_TXATTRCREATE] = v9fs_xattrcreate, - [P9_TMKNOD] = v9fs_mknod, - [P9_TRENAME] = v9fs_rename, - [P9_TLOCK] = v9fs_lock, - [P9_TGETLOCK] = v9fs_getlock, - [P9_TRENAMEAT] = v9fs_renameat, - [P9_TREADLINK] = v9fs_readlink, - [P9_TUNLINKAT] = v9fs_unlinkat, - [P9_TMKDIR] = v9fs_mkdir, - [P9_TVERSION] = v9fs_version, - [P9_TLOPEN] = v9fs_open, - [P9_TATTACH] = v9fs_attach, - [P9_TSTAT] = v9fs_stat, - [P9_TWALK] = v9fs_walk, - [P9_TCLUNK] = v9fs_clunk, - [P9_TFSYNC] = v9fs_fsync, - [P9_TOPEN] = v9fs_open, - [P9_TREAD] = v9fs_read, -#if 0 - [P9_TAUTH] = v9fs_auth, -#endif - [P9_TFLUSH] = v9fs_flush, - [P9_TLINK] = v9fs_link, - [P9_TSYMLINK] = v9fs_symlink, - [P9_TCREATE] = v9fs_create, - [P9_TLCREATE] = v9fs_lcreate, - [P9_TWRITE] = v9fs_write, - [P9_TWSTAT] = v9fs_wstat, - [P9_TREMOVE] = v9fs_remove, -}; - -static void v9fs_op_not_supp(void *opaque) -{ - V9fsPDU *pdu = opaque; - pdu_complete(pdu, -EOPNOTSUPP); -} - -static void v9fs_fs_ro(void *opaque) -{ - V9fsPDU *pdu = opaque; - pdu_complete(pdu, -EROFS); -} - -static inline bool is_read_only_op(V9fsPDU *pdu) -{ - switch (pdu->id) { - case P9_TREADDIR: - case P9_TSTATFS: - case P9_TGETATTR: - case P9_TXATTRWALK: - case P9_TLOCK: - case P9_TGETLOCK: - case P9_TREADLINK: - case P9_TVERSION: - case P9_TLOPEN: - case P9_TATTACH: - case P9_TSTAT: - case P9_TWALK: - case P9_TCLUNK: - case P9_TFSYNC: - case P9_TOPEN: - case P9_TREAD: - case P9_TAUTH: - case P9_TFLUSH: - return 1; - default: - return 0; - } -} - -void pdu_submit(V9fsPDU *pdu) -{ - Coroutine *co; - CoroutineEntry *handler; - V9fsState *s = pdu->s; - - if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || - (pdu_co_handlers[pdu->id] == NULL)) { - handler = v9fs_op_not_supp; - } else { - handler = pdu_co_handlers[pdu->id]; - } - - if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { - handler = v9fs_fs_ro; - } - co = qemu_coroutine_create(handler); - qemu_coroutine_enter(co, pdu); -} - -static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) -{ - struct rlimit rlim; - if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { - fprintf(stderr, "Failed to get the resource limit\n"); - exit(1); - } - open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3); - open_fd_rc = rlim.rlim_cur/2; -}
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