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0062-LU-13985-lustre-seq_file-.next-functions-m...
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File 0062-LU-13985-lustre-seq_file-.next-functions-must-update.patch of Package lustre_2_12
From 817d6c116599639599919bcde7999a7f06b74d2c Mon Sep 17 00:00:00 2001 From: Mr NeilBrown <neilb@suse.de> Date: Fri, 25 Sep 2020 09:46:24 +1000 Subject: [PATCH] LU-13985 lustre: seq_file .next functions must update *pos A seq_file .next function must update *pos on EOF to a value which will cause a subsequent ->start to also return EOF. If it doesn't the last record of the file can be returned twice to a 'read()'. Also the seq_file code will generate a warning. This patch fixes various ->next functions to always update *pos. Signed-off-by: Mr NeilBrown <neilb@suse.de> Change-Id: Ia0c432cd50550ecde6b308cbc554b316fa03adae Reviewed-on: https://review.whamcloud.com/40035 Tested-by: jenkins <devops@whamcloud.com> Reviewed-by: Andreas Dilger <adilger@whamcloud.com> Tested-by: Maloo <maloo@whamcloud.com> Reviewed-by: Chris Horn <chris.horn@hpe.com> Reviewed-by: James Simmons <jsimmons@infradead.org> Reviewed-by: Oleg Drokin <green@whamcloud.com> --- lnet/klnds/gnilnd/gnilnd_proc.c | 8 ++++---- lustre/fid/lproc_fid.c | 1 + lustre/fld/lproc_fld.c | 1 + lustre/lov/lov_pool.c | 28 ++++++++++++++-------------- lustre/obdclass/lu_ref.c | 8 ++++---- lustre/ptlrpc/lproc_ptlrpc.c | 1 + 6 files changed, 25 insertions(+), 22 deletions(-) --- a/lnet/klnds/gnilnd/gnilnd_proc.c +++ b/lnet/klnds/gnilnd/gnilnd_proc.c @@ -459,10 +459,10 @@ kgnilnd_mdd_seq_next(struct seq_file *s, loff_t next = *pos + 1; rc = kgnilnd_mdd_seq_seek(gseq, next); + *pos = next; if (rc != 0) { return NULL; } - *pos = next; return gseq; } @@ -648,11 +648,11 @@ kgnilnd_smsg_seq_next(struct seq_file *s loff_t next = *pos + 1; rc = kgnilnd_smsg_seq_seek(gseq, next); + *pos = next; if (rc != 0) { LIBCFS_FREE(gseq, sizeof(*gseq)); return NULL; } - *pos = next; return gseq; } @@ -864,11 +864,11 @@ kgnilnd_conn_seq_next(struct seq_file *s loff_t next = *pos + 1; rc = kgnilnd_conn_seq_seek(gseq, next); + *pos = next; if (rc != 0) { LIBCFS_FREE(gseq, sizeof(*gseq)); return NULL; } - *pos = next; return gseq; } @@ -1217,11 +1217,11 @@ kgnilnd_peer_seq_next(struct seq_file *s loff_t next = *pos + 1; rc = kgnilnd_peer_seq_seek(gseq, next); + *pos = next; if (rc != 0) { LIBCFS_FREE(gseq, sizeof(*gseq)); return NULL; } - *pos = next; return gseq; } --- a/lustre/fid/lproc_fid.c +++ b/lustre/fid/lproc_fid.c @@ -278,6 +278,7 @@ static void *fldb_seq_next(struct seq_fi const struct dt_it_ops *iops; int rc; + ++*pos; if (param == NULL || param->fsp_stop) return NULL; --- a/lustre/fld/lproc_fld.c +++ b/lustre/fld/lproc_fld.c @@ -210,6 +210,7 @@ static void *fldb_seq_next(struct seq_fi const struct dt_it_ops *iops; int rc; + ++*pos; if (param == NULL || param->fsp_stop) return NULL; --- a/lustre/lov/lov_pool.c +++ b/lustre/lov/lov_pool.c @@ -170,25 +170,25 @@ struct pool_iterator { static void *pool_proc_next(struct seq_file *s, void *v, loff_t *pos) { - struct pool_iterator *iter = (struct pool_iterator *)s->private; - int prev_idx; + struct pool_iterator *iter = (struct pool_iterator *)s->private; + int prev_idx; LASSERTF(iter->magic == POOL_IT_MAGIC, "%08X\n", iter->magic); - /* test if end of file */ - if (*pos >= pool_tgt_count(iter->pool)) - return NULL; + (*pos)++; + /* test if end of file */ + if (*pos > pool_tgt_count(iter->pool)) + return NULL; - /* iterate to find a non empty entry */ - prev_idx = iter->idx; - iter->idx++; + /* iterate to find a non empty entry */ + prev_idx = iter->idx; + iter->idx++; if (iter->idx >= pool_tgt_count(iter->pool)) { - iter->idx = prev_idx; /* we stay on the last entry */ - return NULL; - } - (*pos)++; - /* return != NULL to continue */ - return iter; + iter->idx = prev_idx; /* we stay on the last entry */ + return NULL; + } + /* return != NULL to continue */ + return iter; } static void *pool_proc_start(struct seq_file *s, loff_t *pos) --- a/lustre/obdclass/lu_ref.c +++ b/lustre/obdclass/lu_ref.c @@ -309,15 +309,15 @@ static void *lu_ref_seq_next(struct seq_ LASSERT(seq->private == p); LASSERT(!list_empty(&ref->lf_linkage)); + (*pos)++; spin_lock(&lu_ref_refs_guard); next = list_entry(ref->lf_linkage.next, struct lu_ref, lf_linkage); - if (&next->lf_linkage == &lu_ref_refs) { + if (&next->lf_linkage == &lu_ref_refs) p = NULL; - } else { - (*pos)++; + else list_move(&ref->lf_linkage, &next->lf_linkage); - } spin_unlock(&lu_ref_refs_guard); + return p; } --- a/lustre/ptlrpc/lproc_ptlrpc.c +++ b/lustre/ptlrpc/lproc_ptlrpc.c @@ -946,6 +946,7 @@ ptlrpc_lprocfs_svc_req_history_start(str } OBD_FREE(srhi, sizeof(*srhi)); + ++*pos; return NULL; }
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