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| author | Johnny Chang <johnnyc@synology.com> | 2019-04-26 11:01:05 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-05-03 18:21:25 +0200 |
| commit | 2b90883c561ddcc641741c2e4df1f702a4f2acb8 (patch) | |
| tree | f920330ff01a0810964e3b601d60c4cb01f0f2e9 | |
| parent | b1c16ac978fd40ae636e629bb69a652df7eebdc2 (diff) | |
| download | linux-stable-2b90883c561ddcc641741c2e4df1f702a4f2acb8.tar.gz linux-stable-2b90883c561ddcc641741c2e4df1f702a4f2acb8.tar.bz2 linux-stable-2b90883c561ddcc641741c2e4df1f702a4f2acb8.zip | |
btrfs: Check the compression level before getting a workspace
When a file's compression property is set as zlib or zstd but leave
the compression mount option not be set, that means btrfs will try
to compress the file with default compression level. But in
btrfs_compress_pages(), it calls get_workspace() with level = 0.
This will return a workspace with a wrong compression level.
For zlib, the compression level in the workspace will be 0
(that means "store only"). And for zstd, the compression in the
workspace will be 1, not the default level 3.
How to reproduce:
mkfs -t btrfs /dev/sdb
mount /dev/sdb /mnt/
mkdir /mnt/zlib
btrfs property set /mnt/zlib/ compression zlib
dd if=/dev/zero of=/mnt/zlib/compression-friendly-file-10M bs=1M count=10
sync
btrfs-debugfs -f /mnt/zlib/compression-friendly-file-10M
btrfs-debugfs output:
* before:
...
(258 9961472): ram 524288 disk 1106247680 disk_size 524288
file: ... extents 20 disk size 10485760 logical size 10485760 ratio 1.00
* after:
...
(258 10354688): ram 131072 disk 14217216 disk_size 4096
file: ... extents 80 disk size 327680 logical size 10485760 ratio 32.00
The steps for zstd are similar, but need to put a debugging message to
show the level of the return workspace in zstd_get_workspace().
This commit adds a check of the compression level before getting a
workspace by set_level().
CC: stable@vger.kernel.org # 5.1+
Signed-off-by: Johnny Chang <johnnyc@synology.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/compression.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 1463e14af2fb..4ec1df369e47 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -1009,6 +1009,7 @@ int btrfs_compress_pages(unsigned int type_level, struct address_space *mapping, struct list_head *workspace; int ret; + level = btrfs_compress_op[type]->set_level(level); workspace = get_workspace(type, level); ret = btrfs_compress_op[type]->compress_pages(workspace, mapping, start, pages, |