File 0114-btrfs-progs-Add-ioctl-to-read-compressed-size-of-a-f.patch of Package btrfsprogs
From 72218a2090e1cbafe9baa97aaa465a28438c3dbb Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Mon, 19 Dec 2011 17:51:11 +0100
Subject: [PATCH 16/43] btrfs-progs: Add ioctl to read compressed size of a
file
Signed-off-by: David Sterba <dsterba@suse.cz>
---
btrfs.c | 9 ++++++-
btrfs_cmds.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++
btrfs_cmds.h | 1 +
ioctl.h | 13 ++++++++++
man/btrfs.8.in.old | 10 +++++++
5 files changed, 100 insertions(+), 1 deletions(-)
diff --git a/btrfs.c b/btrfs.c
index e78f194..f5b8fd4 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -325,7 +325,14 @@ static struct Command commands[] = {
"filesystem label", "<device> [<newlabel>]\n"
"With one argument, get the label of filesystem on <device>.\n"
"If <newlabel> is passed, set the filesystem label to <newlabel>.\n"
- "The filesystem must be unmounted.\n"
+ "The filesystem must be unmounted."
+ },
+ { do_compr_size, -1,
+ "filesystem csize", "[-s start] [-e end] <file>\n"
+ "Read ordinary and compressed size of extents in the range [start,end)\n"
+ "-s start range start inclusive, accepts K/M/G modifiers\n"
+ "-e end range end exclusive, accepts K/M/G modifiers\n",
+ NULL
},
{ do_scrub_start, -1,
"scrub start", "[-Bdqr] <path>|<device>\n"
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index 12346e5..c8196d1 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -2058,3 +2058,71 @@ out:
free(inodes);
return ret;
}
+
+int do_compr_size(int argc, char **argv)
+{
+ int ret;
+ int fd;
+ struct btrfs_ioctl_compr_size_args args;
+
+ args.start = 0;
+ args.end = (u64)-1;
+ optind = 1;
+ while (1) {
+ int c = getopt(argc, argv, "s:e:r");
+ if (c < 0)
+ break;
+ switch (c) {
+ case 's':
+ args.start = parse_size(optarg);
+ break;
+ case 'e':
+ args.end = parse_size(optarg);
+ break;
+ default:
+ fprintf(stderr, "ERROR: Invalid arguments for csize\n");
+ return 1;
+ }
+ }
+
+ if (args.start > args.end) {
+ fprintf(stderr, "ERROR: Invalid range for csize\n");
+ return 1;
+ }
+
+ if (argc - optind == 0) {
+ fprintf(stderr, "ERROR: Invalid arguments for csize\n");
+ return 1;
+ }
+ argc -= optind;
+
+ fd = open_file_or_dir(argv[optind]);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind]);
+ return 1;
+ }
+
+ ret = ioctl(fd, BTRFS_IOC_COMPR_SIZE, &args);
+ if (ret < 0) {
+ fprintf(stderr, "ERROR: ioctl returned %d, errno %d %s\n",
+ ret, errno, strerror(errno));
+ return errno;
+ }
+
+ printf("File name: %s\n", argv[optind]);
+ if (args.end == (u64)-1)
+ printf("File range: %llu-EOF\n",
+ (unsigned long long)args.start);
+ else
+ printf("File range: %llu-%llu\n",
+ (unsigned long long)args.start,
+ (unsigned long long)args.end);
+
+ printf("Compressed size: %llu\n",
+ (unsigned long long)(args.compressed_size << 9));
+ printf("Uncompressed size: %llu\n",
+ (unsigned long long)(args.size << 9));
+ printf("Ratio: %3.2f%%\n",
+ 100.0 * args.compressed_size / args.size);
+ return 0;
+}
diff --git a/btrfs_cmds.h b/btrfs_cmds.h
index 53d51d6..07dad7a 100644
--- a/btrfs_cmds.h
+++ b/btrfs_cmds.h
@@ -46,3 +46,4 @@ int open_file_or_dir(const char *fname);
int do_ino_to_path(int nargs, char **argv);
int do_logical_to_ino(int nargs, char **argv);
char *path_for_root(int fd, u64 root);
+int do_compr_size(int argc, char **argv);
diff --git a/ioctl.h b/ioctl.h
index 78aebce..a820098 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -272,6 +272,17 @@ struct btrfs_ioctl_logical_ino_args {
__u64 inodes;
};
+struct btrfs_ioctl_compr_size_args {
+ /* Range start, inclusive */
+ __u64 start; /* in */
+ /* Range end, exclusive */
+ __u64 end; /* in */
+ __u64 size; /* out */
+ __u64 compressed_size; /* out */
+ __u64 reserved[2];
+};
+
+
/* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
@@ -330,5 +341,7 @@ struct btrfs_ioctl_logical_ino_args {
struct btrfs_ioctl_ino_path_args)
#define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
struct btrfs_ioctl_ino_path_args)
+#define BTRFS_IOC_COMPR_SIZE _IOR(BTRFS_IOCTL_MAGIC, 51, \
+ struct btrfs_ioctl_compr_size_args)
#endif
diff --git a/man/btrfs.8.in.old b/man/btrfs.8.in.old
index be478e0..b7dacea 100644
--- a/man/btrfs.8.in.old
+++ b/man/btrfs.8.in.old
@@ -31,6 +31,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBfilesystem defragment\fP\fI <file>|<dir> [<file>|<dir>...]\fP
.PP
+\fBbtrfs\fP \fBfilesystem csize \fP\fI [-s start] [-e end] <file> \fP
+.PP
\fBbtrfs\fP \fBdevice scan\fP\fI [--all-devices|<device> [<device>...]]\fP
.PP
\fBbtrfs\fP \fBdevice show\fP\fI [--all-devices|<uuid>|<label>]\fP
@@ -209,6 +211,14 @@ If \fB--all-devices\fP is passed, all the devices under /dev are scanned;
otherwise the devices list is extracted from the /proc/partitions file.
.TP
+\fBfilesystem csize \fR \fI [-s start] [-e end] <file> \fR
+Read ordinary and compressed size of extents in the range [start,end) of \fI<file>\fR
+.IP
+\fB-s start\fP range start inclusive, accepts K/M/G modifiers
+.IP
+\fB-e end\fP range end exclusive, accepts K/M/G modifiers
+.TP
+
\fBdevice balance\fR \fI<path>\fR
Balance the chunks of the filesystem identified by \fI<path>\fR
across the devices.
--
1.7.6.233.gd79bc
