diff options
| author | Rosen Penev <rosenp@gmail.com> | 2018-01-07 13:54:21 -0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-01-31 15:14:03 +0100 |
| commit | e4df433b8a2d5ef944ab4764a5ad237bcdbd1fdc (patch) | |
| tree | 19aa758dee389cea7c86c68ce1c8cc8e9a52836c /cmds-inspect-dump-super.c | |
| parent | 24103f42ad7a65457a62ae5c0190ea0e428cb14b (diff) | |
btrfs-progs: treewide: Replace strerror(errno) with %m.
As btrfs is specific to Linux, %m can be used instead of strerror(errno)
in format strings. This has some size reduction benefits for embedded
systems.
glibc, musl, and uclibc-ng all support %m as a modifier to printf.
A quick glance at the BIONIC libc source indicates that it has
support for %m as well. BSDs and Windows do not but I do believe
them to be beyond the scope of btrfs-progs.
Compiled sizes on Ubuntu 16.04:
Before:
3916512 btrfs
233688 libbtrfs.so.0.1
4899 bcp
2367672 btrfs-convert
2208488 btrfs-corrupt-block
13302 btrfs-debugfs
2152160 btrfs-debug-tree
2136024 btrfs-find-root
2287592 btrfs-image
2144600 btrfs-map-logical
2130760 btrfs-select-super
2152608 btrfstune
2131760 btrfs-zero-log
2277752 mkfs.btrfs
9166 show-blocks
After:
3908744 btrfs
233256 libbtrfs.so.0.1
4899 bcp
2366560 btrfs-convert
2207432 btrfs-corrupt-block
13302 btrfs-debugfs
2151104 btrfs-debug-tree
2134968 btrfs-find-root
2281864 btrfs-image
2143536 btrfs-map-logical
2129704 btrfs-select-super
2151552 btrfstune
2130696 btrfs-zero-log
2276272 mkfs.btrfs
9166 show-blocks
Total savings: 23928 (24 kilo)bytes
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'cmds-inspect-dump-super.c')
| -rw-r--r-- | cmds-inspect-dump-super.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/cmds-inspect-dump-super.c b/cmds-inspect-dump-super.c index 23a71155..150c2e5a 100644 --- a/cmds-inspect-dump-super.c +++ b/cmds-inspect-dump-super.c @@ -472,7 +472,7 @@ static int load_and_dump_sb(char *filename, int fd, u64 sb_bytenr, int full, error("failed to read the superblock on %s at %llu", filename, (unsigned long long)sb_bytenr); - error("error = '%s', errno = %d", strerror(errno), errno); + error("error = '%m', errno = %d", errno); return 1; } printf("superblock: bytenr=%llu, device=%s\n", sb_bytenr, filename); @@ -583,7 +583,7 @@ int cmd_inspect_dump_super(int argc, char **argv) filename = argv[i]; fd = open(filename, O_RDONLY); if (fd < 0) { - error("cannot open %s: %s", filename, strerror(errno)); + error("cannot open %s: %m", filename); ret = 1; goto out; } |