Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-21 15:33:19 +00:00
Code Issues Packages Projects Releases Wiki Activity

f2fs: compress: allow write compress released file after truncate to zero

Browse Source 
For compressed file, after release compress blocks, don't allow write
direct, but we should allow write direct after truncate to zero.

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Fengnan Chang <changfengnan@vivo.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Fengnan Chang 2021-08-09 10:21:04 +08:00 committed by Jaegeuk Kim
parent 1927ccdb79
commit 4a4fc043f5
2 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/filesystems/f2fs.rst
View File

@ -865,8 +865,11 @@ Compression implementation
directly in order to guarantee potential data updates later to the space.
Instead, the main goal is to reduce data writes to flash disk as much as
possible, resulting in extending disk life time as well as relaxing IO
congestion. Alternatively, we've added ioctl interface to reclaim compressed
space and show it to user after putting the immutable bit.
congestion. Alternatively, we've added ioctl(F2FS_IOC_RELEASE_COMPRESS_BLOCKS)
interface to reclaim compressed space and show it to user after putting the
immutable bit. Immutable bit, after release, it doesn't allow writing/mmaping
on the file, until reserving compressed space via
ioctl(F2FS_IOC_RESERVE_COMPRESS_BLOCKS) or truncating filesize to zero.
Compress metadata layout::

8
fs/f2fs/file.c
View File

@ -753,6 +753,14 @@ int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)
return err;
#ifdef CONFIG_F2FS_FS_COMPRESSION
/*
* For compressed file, after release compress blocks, don't allow write
* direct, but we should allow write direct after truncate to zero.
*/
if (f2fs_compressed_file(inode) && !free_from
&& is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
clear_inode_flag(inode, FI_COMPRESS_RELEASED);
if (from != free_from) {
err = f2fs_truncate_partial_cluster(inode, from, lock);
if (err)