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authorChristoph Hellwig <hch@tuxera.com>2010-10-01 07:46:31 +0400
committerChristoph Hellwig <hch@lst.de>2010-10-01 07:46:31 +0400
commit7fcc99f4f2ddb1c39abc05fbb9b32f05b03c7f8f (patch)
treeb07045981f17d855f89f1ef59579e330d8ffce20 /fs/hfsplus
parent89755dcace09b44b3aa024bf302d9b19b4c24cad (diff)
downloadlinux-7fcc99f4f2ddb1c39abc05fbb9b32f05b03c7f8f.tar.xz
hfsplus: add missing extent locking in hfsplus_write_inode
Most of the extent handling code already does proper SMP locking, but hfsplus_write_inode was calling into hfsplus_ext_write_extent without taking the extents_lock. Fix this by splitting hfsplus_ext_write_extent into an internal helper that expects the lock, and a public interface that first acquires it. Also add a few locking asserts and document the locking rules in hfsplus_fs.h. Signed-off-by: Christoph Hellwig <hch@tuxera.com>
Diffstat (limited to 'fs/hfsplus')
-rw-r--r--fs/hfsplus/extents.c15
-rw-r--r--fs/hfsplus/hfsplus_fs.h34
2 files changed, 34 insertions, 15 deletions
diff --git a/fs/hfsplus/extents.c b/fs/hfsplus/extents.c
index b1017eaa4fdc..0c9cb1820a52 100644
--- a/fs/hfsplus/extents.c
+++ b/fs/hfsplus/extents.c
@@ -88,6 +88,8 @@ static void __hfsplus_ext_write_extent(struct inode *inode, struct hfs_find_data
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
int res;
+ WARN_ON(!mutex_is_locked(&hip->extents_lock));
+
hfsplus_ext_build_key(fd->search_key, inode->i_ino, hip->cached_start,
HFSPLUS_IS_RSRC(inode) ?
HFSPLUS_TYPE_RSRC : HFSPLUS_TYPE_DATA);
@@ -108,7 +110,7 @@ static void __hfsplus_ext_write_extent(struct inode *inode, struct hfs_find_data
}
}
-void hfsplus_ext_write_extent(struct inode *inode)
+static void hfsplus_ext_write_extent_locked(struct inode *inode)
{
if (HFSPLUS_I(inode)->flags & HFSPLUS_FLG_EXT_DIRTY) {
struct hfs_find_data fd;
@@ -119,6 +121,13 @@ void hfsplus_ext_write_extent(struct inode *inode)
}
}
+void hfsplus_ext_write_extent(struct inode *inode)
+{
+ mutex_lock(&HFSPLUS_I(inode)->extents_lock);
+ hfsplus_ext_write_extent_locked(inode);
+ mutex_unlock(&HFSPLUS_I(inode)->extents_lock);
+}
+
static inline int __hfsplus_ext_read_extent(struct hfs_find_data *fd,
struct hfsplus_extent *extent,
u32 cnid, u32 block, u8 type)
@@ -144,6 +153,8 @@ static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd, struct in
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
int res;
+ WARN_ON(!mutex_is_locked(&hip->extents_lock));
+
if (hip->flags & HFSPLUS_FLG_EXT_DIRTY)
__hfsplus_ext_write_extent(inode, fd);
@@ -433,7 +444,7 @@ out:
insert_extent:
dprint(DBG_EXTENT, "insert new extent\n");
- hfsplus_ext_write_extent(inode);
+ hfsplus_ext_write_extent_locked(inode);
memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
hip->cached_extents[0].start_block = cpu_to_be32(start);
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index c521d44f0747..c007cc201279 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -158,28 +158,36 @@ struct hfsplus_sb_info {
struct hfsplus_inode_info {
- struct mutex extents_lock;
- u32 clump_blocks, alloc_blocks;
- sector_t fs_blocks;
- /* Allocation extents from catalog record or volume header */
- hfsplus_extent_rec first_extents;
- u32 first_blocks;
- hfsplus_extent_rec cached_extents;
- u32 cached_start, cached_blocks;
atomic_t opencnt;
- struct inode *rsrc_inode;
+ /*
+ * Extent allocation information, protected by extents_lock.
+ */
+ u32 first_blocks;
+ u32 clump_blocks;
+ u32 alloc_blocks;
+ u32 cached_start;
+ u32 cached_blocks;
+ hfsplus_extent_rec first_extents;
+ hfsplus_extent_rec cached_extents;
unsigned long flags;
+ struct mutex extents_lock;
+ /*
+ * Immutable data.
+ */
+ struct inode *rsrc_inode;
__be32 create_date;
- /* Device number in hfsplus_permissions in catalog */
u32 dev;
- /* BSD system and user file flags */
- u8 rootflags;
- u8 userflags;
+ /*
+ * Protected by i_mutex.
+ */
+ sector_t fs_blocks;
+ u8 rootflags, userflags; /* BSD system and user file flags */
struct list_head open_dir_list;
loff_t phys_size;
+
struct inode vfs_inode;
};