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| author | Amir Goldstein <amir73il@gmail.com> | 2016-09-23 11:38:12 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2016-12-16 13:02:54 +0300 |
| commit | 2ea98466491b7609ace297647b07c28d99ef3722 (patch) | |
| tree | 12ffc06a7407573c47653ecc5bbcee4103616709 /fs | |
| parent | 31c3a7069593b072bd57192b63b62f9a7e994e9a (diff) | |
| download | linux-2ea98466491b7609ace297647b07c28d99ef3722.tar.xz | |
ovl: use vfs_clone_file_range() for copy up if possible
When copying up within the same fs, try to use vfs_clone_file_range().
This is very efficient when lower and upper are on the same fs
with file reflink support. If vfs_clone_file_range() fails for any
reason, copy up falls back to the regular data copy code.
Tested correct behavior when lower and upper are on:
1. same ext4 (copy)
2. same xfs + reflink patches + mkfs.xfs (copy)
3. same xfs + reflink patches + mkfs.xfs -m reflink=1 (reflink)
4. different xfs + reflink patches + mkfs.xfs -m reflink=1 (copy)
For comparison, on my laptop, xfstest overlay/001 (copy up of large
sparse files) takes less than 1 second in the xfs reflink setup vs.
25 seconds on the rest of the setups.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/overlayfs/copy_up.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index 36795eed40b0..f18c1a616e9e 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -153,6 +153,13 @@ static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len) goto out_fput; } + /* Try to use clone_file_range to clone up within the same fs */ + error = vfs_clone_file_range(old_file, 0, new_file, 0, len); + if (!error) + goto out; + /* Couldn't clone, so now we try to copy the data */ + error = 0; + /* FIXME: copy up sparse files efficiently */ while (len) { size_t this_len = OVL_COPY_UP_CHUNK_SIZE; @@ -177,7 +184,7 @@ static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len) len -= bytes; } - +out: if (!error) error = vfs_fsync(new_file, 0); fput(new_file); |