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hfsplus: use alloc_mutex in hfsplus_sync_fs

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Use alloc_mutex to protect hfsplus_sync_fs against itself and concurrent
allocations, which allows to get rid of lock_super in hfsplus.

Note that most fields in the superblock still aren't protected against
concurrent allocations, that will follow later.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
This commit is contained in:
Christoph Hellwig 2010-10-01 05:41:50 +02:00
parent 40bf48afe9
commit a9fdbf8c60
1 changed files with 2 additions and 2 deletions
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4
fs/hfsplus/super.c
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@ -162,7 +162,7 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
dprint(DBG_SUPER, "hfsplus_write_super\n");
lock_super(sb);
mutex_lock(&HFSPLUS_SB(sb).alloc_mutex);
sb->s_dirt = 0;
vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
@ -195,7 +195,7 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
}
HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
}
unlock_super(sb);
mutex_unlock(&HFSPLUS_SB(sb).alloc_mutex);
return 0;
}