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hfsplus: add per-superblock lock for volume header updates

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Lock updates to the mutal fields in the volume header, and document the
locing in the hfsplus_sb_info structure.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
This commit is contained in:
Christoph Hellwig
2010-10-01 05:45:08 +02:00
committed by Christoph Hellwig
parent 58a818f532
commit 7ac9fb9c2a
3 changed files with 50 additions and 24 deletions
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13
fs/hfsplus/hfsplus_fs.h
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@@ -116,23 +116,26 @@ 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;
int fs_shift;
/* Stuff in host order from Vol Header */
/* immutable data from the volume header */
u32 alloc_blksz;
int alloc_blksz_shift;
u32 total_blocks;
u32 data_clump_blocks, rsrc_clump_blocks;
/* mutable data from the volume header, protected by alloc_mutex */
u32 free_blocks;
struct mutex alloc_mutex;
/* mutable data from the volume header, protected by vh_mutex */
u32 next_cnid;
u32 file_count;
u32 folder_count;
u32 data_clump_blocks, rsrc_clump_blocks;
struct mutex vh_mutex;
/* Config options */
u32 creator;