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| author | Christoph Hellwig <hch@lst.de> | 2010-10-01 05:41:39 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2010-10-01 05:41:39 +0200 |
| commit | 40bf48afe92fcea61e7e164f0b2599fba8b88124 (patch) | |
| tree | 233a48a5e2de1c469804f6745d8fd48e62c78abc /fs/hfsplus | |
| parent | 6333816ade7e04a96ec0a34a8378c455e4f7c4dd (diff) | |
| download | lwn-40bf48afe92fcea61e7e164f0b2599fba8b88124.tar.gz lwn-40bf48afe92fcea61e7e164f0b2599fba8b88124.zip | |
hfsplus: introduce alloc_mutex
Use a new per-sb alloc_mutex instead of abusing i_mutex of the alloc_file
to protect block allocations. This gets rid of lockdep nesting warnings
and prepares for extending the scope of alloc_mutex.
Signed-off-by: Christoph Hellwig <hch@tuxera.com>
Diffstat (limited to 'fs/hfsplus')
| -rw-r--r-- | fs/hfsplus/bitmap.c | 8 | ||||
| -rw-r--r-- | fs/hfsplus/hfsplus_fs.h | 3 | ||||
| -rw-r--r-- | fs/hfsplus/super.c | 1 |
3 files changed, 8 insertions, 4 deletions
diff --git a/fs/hfsplus/bitmap.c b/fs/hfsplus/bitmap.c index ea30afc2a03c..8a781769a901 100644 --- a/fs/hfsplus/bitmap.c +++ b/fs/hfsplus/bitmap.c @@ -29,7 +29,7 @@ int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset, u32 *ma return size; dprint(DBG_BITMAP, "block_allocate: %u,%u,%u\n", size, offset, len); - mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex); + mutex_lock(&HFSPLUS_SB(sb).alloc_mutex); mapping = HFSPLUS_SB(sb).alloc_file->i_mapping; page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS, NULL); if (IS_ERR(page)) { @@ -154,7 +154,7 @@ done: sb->s_dirt = 1; dprint(DBG_BITMAP, "-> %u,%u\n", start, *max); out: - mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex); + mutex_unlock(&HFSPLUS_SB(sb).alloc_mutex); return start; } @@ -175,7 +175,7 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count) if ((offset + count) > HFSPLUS_SB(sb).total_blocks) return -2; - mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex); + mutex_lock(&HFSPLUS_SB(sb).alloc_mutex); mapping = HFSPLUS_SB(sb).alloc_file->i_mapping; pnr = offset / PAGE_CACHE_BITS; page = read_mapping_page(mapping, pnr, NULL); @@ -226,7 +226,7 @@ out: kunmap(page); HFSPLUS_SB(sb).free_blocks += len; sb->s_dirt = 1; - mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex); + mutex_unlock(&HFSPLUS_SB(sb).alloc_mutex); return 0; } diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h index dc856be3c2b0..df0a6312f0f0 100644 --- a/fs/hfsplus/hfsplus_fs.h +++ b/fs/hfsplus/hfsplus_fs.h @@ -116,6 +116,9 @@ struct hfsplus_sb_info { struct inode *hidden_dir; struct nls_table *nls; + /* synchronize block allocations */ + struct mutex alloc_mutex; + /* Runtime variables */ u32 blockoffset; u32 sect_count; diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c index 3b55c050c742..3dc62aa58728 100644 --- a/fs/hfsplus/super.c +++ b/fs/hfsplus/super.c @@ -321,6 +321,7 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) sb->s_fs_info = sbi; INIT_HLIST_HEAD(&sbi->rsrc_inodes); + mutex_init(&sbi->alloc_mutex); hfsplus_fill_defaults(sbi); if (!hfsplus_parse_options(data, sbi)) { printk(KERN_ERR "hfs: unable to parse mount options\n"); |