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| author |   Namjae Jeon <namjae.jeon@samsung.com> | 2014-12-12 16:57:26 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-13 12:42:51 -0800 |
| commit | c0ef0cc9d277f0f2a83b5a287a816b3916d9f026 (patch) | |
| tree | 8dc88d4fc0de0bb485578ad6482044a0ecfdef2d /fs/fat/file.c | |
| parent | befs: remove dead code (diff) | |
| download | linux-dev-c0ef0cc9d277f0f2a83b5a287a816b3916d9f026.tar.xz linux-dev-c0ef0cc9d277f0f2a83b5a287a816b3916d9f026.zip | |
fat: fix data past EOF resulting from fsx testsuite
When running FSX with direct I/O mode, fsx resulted in DATA past EOF issues.
fsx ./file2 -Z -r 4096 -w 4096
...
..
truncating to largest ever: 0x907c
fallocating to largest ever: 0x11137
truncating to largest ever: 0x2c6fe
truncating to largest ever: 0x2cfdf
fallocating to largest ever: 0x40000
Mapped Read: non-zero data past EOF (0x18628) page offset 0x629 is 0x2a4e
...
..
The reason being, it is doing a truncate down, but the zeroing does not
happen on the last block boundary when offset is not aligned. Even though
it calls truncate_setsize()->truncate_inode_pages()->
truncate_inode_pages_range() and considers the partial zeroout but it
retrieves the page using find_lock_page() - which only looks the page in
the cache. So, zeroing out does not happen in case of direct IO.
Make a truncate page based around block_truncate_page for FAT filesystem
and invoke that helper to zerout in case the offset is not aligned with
the blocksize.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat/file.c')
| -rw-r--r-- | fs/fat/file.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/fat/file.c b/fs/fat/file.c index 85f79a89e747..8429c68e3057 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -443,6 +443,9 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr) } if (attr->ia_valid & ATTR_SIZE) { + error = fat_block_truncate_page(inode, attr->ia_size); + if (error) + goto out; down_write(&MSDOS_I(inode)->truncate_lock); truncate_setsize(inode, attr->ia_size); fat_truncate_blocks(inode, attr->ia_size); |