diff options
author | Qu Wenruo <wqu@suse.com> | 2017-10-19 17:13:55 +0800 |
---|---|---|
committer | David Sterba <dsterba@suse.com> | 2018-01-08 18:15:15 +0100 |
commit | 1c9c5f7fb3f6a2182d230d469b22b3b1329f24d8 (patch) | |
tree | 7bdd2d05a882a68d1883e16d2970f17152f2cff9 /mkfs/rootdir.c | |
parent | c28418daed603d4943edc8b213b91f8d1e2b9fe3 (diff) |
btrfs-progs: mkfs: Separate shrink from rootdir
Make --shrink a separate option for --rootdir, and change the default to
off.
The shrinking behaviour is not a commonly used feature but can be useful
for creating minimal pre-filled images, in one step, without requiring
to mount.
Signed-off-by: Qu Wenruo <wqu@suse.com>
[ update changelog and error messages ]
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'mkfs/rootdir.c')
-rw-r--r-- | mkfs/rootdir.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/mkfs/rootdir.c b/mkfs/rootdir.c index 0dc022b0..9be4bcbf 100644 --- a/mkfs/rootdir.c +++ b/mkfs/rootdir.c @@ -899,11 +899,13 @@ err: return ret; } -int btrfs_mkfs_shrink_fs(struct btrfs_fs_info *fs_info, u64 *new_size_ret) +int btrfs_mkfs_shrink_fs(struct btrfs_fs_info *fs_info, u64 *new_size_ret, + bool shrink_file_size) { u64 new_size; struct btrfs_device *device; struct list_head *cur; + struct stat64 file_stat; int nr_devs = 0; int ret; @@ -931,5 +933,22 @@ int btrfs_mkfs_shrink_fs(struct btrfs_fs_info *fs_info, u64 *new_size_ret) return ret; if (new_size_ret) *new_size_ret = new_size; + + if (shrink_file_size) { + ret = fstat64(device->fd, &file_stat); + if (ret < 0) { + error("failed to stat devid %llu: %s", device->devid, + strerror(errno)); + return ret; + } + if (!S_ISREG(file_stat.st_mode)) + return ret; + ret = ftruncate64(device->fd, new_size); + if (ret < 0) { + error("failed to truncate device file of devid %llu: %s", + device->devid, strerror(errno)); + return ret; + } + } return ret; } |