| commit | 98283bb49c6c8c070ebde9f47489d3e9a83c1323 | |
| author | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | |
| Mon, 16 Jul 2007 00:40:05 +0000 (16 09:40 +0900) | ||
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | |
| Mon, 16 Jul 2007 17:31:01 +0000 (16 10:31 -0700) | ||
| tree | f124325ac1768bee61b82e7689bc48ea102efe56 | treesnapshot (tar.gz zip) |
| parent | 347e03df1696ab22963f6b8c4f2220c41ec17f82 | commitdiff |
fat: Fix the race of read/write the FAT12 entry
FAT12 entry is 12bits, so it needs 2 phase to update the value. And
writer and reader access it without any lock, so reader can get the
half updated value.
This fixes the long standing race condition by adding a global
spinlock to only FAT12 for avoiding any impact against FAT16/32.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
FAT12 entry is 12bits, so it needs 2 phase to update the value. And
writer and reader access it without any lock, so reader can get the
half updated value.
This fixes the long standing race condition by adding a global
spinlock to only FAT12 for avoiding any impact against FAT16/32.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| fs/fat/fatent.c | diffblobblamehistory |