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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-11-06 12:53:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-06 15:41:21 -0800
commit2bdf67eb1631f30e2f3f5d49e4007c76e88877a8 (patch)
treed3d337e52516b3b61cdf4508cf445ef8dcaae2ed /fs/fat/fat.h
parent0e75f5da06c05425f4b375eb981c4489fb2d9787 (diff)
downloadlinux-2.6.38-lt-ux500-2bdf67eb1631f30e2f3f5d49e4007c76e88877a8.tar.gz
fat: mmu_private race fix
mmu_private is 64bits value, hence it's not atomic to update. So, the access rule for mmu_private is we must hold ->i_mutex. But, fat_get_block() path doesn't follow the rule on non-allocation path. This fixes by using i_size instead if non-allocation path. Signed-off-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/fat.h')
-rw-r--r--fs/fat/fat.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index a69f7f9757c..4efc5038ed2 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -91,7 +91,9 @@ struct msdos_inode_info {
/* for avoiding the race between fat_free() and fat_get_cluster() */
unsigned int cache_valid_id;
- loff_t mmu_private;
+ /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
+ loff_t mmu_private; /* physically allocated size */
+
int i_start; /* first cluster or 0 */
int i_logstart; /* logical first cluster */
int i_attrs; /* unused attribute bits */
@@ -222,7 +224,7 @@ extern void fat_cache_inval_inode(struct inode *inode);
extern int fat_get_cluster(struct inode *inode, int cluster,
int *fclus, int *dclus);
extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
- unsigned long *mapped_blocks);
+ unsigned long *mapped_blocks, int create);
/* fat/dir.c */
extern const struct file_operations fat_dir_operations;