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Fix _fat_bmap() locking

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On swapon() path, it has already i_mutex. So, this uses i_alloc_sem
instead of it.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Reported-by: Laurent GUERBY <laurent@guerby.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
OGAWA Hirofumi 2009-03-12 02:03:23 +09:00 committed by Linus Torvalds
parent ad3bdefe87
commit 3a95ea1155
1 changed files with 2 additions and 2 deletions
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4
fs/fat/inode.c
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@ -202,9 +202,9 @@ static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
sector_t blocknr;
/* fat_get_cluster() assumes the requested blocknr isn't truncated. */
mutex_lock(&mapping->host->i_mutex);
down_read(&mapping->host->i_alloc_sem);
blocknr = generic_block_bmap(mapping, block, fat_get_block);
mutex_unlock(&mapping->host->i_mutex);
up_read(&mapping->host->i_alloc_sem);
return blocknr;
}