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authorChristoph Hellwig <hch@tuxera.com>2010-10-01 07:45:08 +0400
committerChristoph Hellwig <hch@lst.de>2010-10-01 07:45:08 +0400
commit7ac9fb9c2a50963b699b3548e6f00698c1554dc6 (patch)
tree3660bfb2985c65838b5969694e54043ae6639b3a /fs/hfsplus/hfsplus_fs.h
parent58a818f532e83f337689358c102ba2048d1b37f5 (diff)
downloadlinux-7ac9fb9c2a50963b699b3548e6f00698c1554dc6.tar.xz
hfsplus: add per-superblock lock for volume header updates
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>
Diffstat (limited to 'fs/hfsplus/hfsplus_fs.h')
-rw-r--r--fs/hfsplus/hfsplus_fs.h13
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 0cd9ba00f968..08865ed70f00 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -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;