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hfsplus: split up inode flags

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Split the flags field in the hfsplus inode into an extent_state
flag that is locked by the extent_lock, and a new flags field
that uses atomic bitops.  The second will grow more flags in the
next patch.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
This commit is contained in:
Christoph Hellwig 2010-11-23 14:38:13 +01:00 committed by Christoph Hellwig
parent eb29d66d4f
commit b33b7921db
4 changed files with 29 additions and 19 deletions
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20
fs/hfsplus/extents.c
View File

@ -95,24 +95,24 @@ static void __hfsplus_ext_write_extent(struct inode *inode, struct hfs_find_data
HFSPLUS_TYPE_RSRC : HFSPLUS_TYPE_DATA);
res = hfs_brec_find(fd);
if (hip->flags & HFSPLUS_FLG_EXT_NEW) {
if (hip->extent_state & HFSPLUS_EXT_NEW) {
if (res != -ENOENT)
return;
hfs_brec_insert(fd, hip->cached_extents,
sizeof(hfsplus_extent_rec));
hip->flags &= ~(HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW);
hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
} else {
if (res)
return;
hfs_bnode_write(fd->bnode, hip->cached_extents,
fd->entryoffset, fd->entrylength);
hip->flags &= ~HFSPLUS_FLG_EXT_DIRTY;
hip->extent_state &= ~HFSPLUS_EXT_DIRTY;
}
}
static void hfsplus_ext_write_extent_locked(struct inode *inode)
{
if (HFSPLUS_I(inode)->flags & HFSPLUS_FLG_EXT_DIRTY) {
if (HFSPLUS_I(inode)->extent_state & HFSPLUS_EXT_DIRTY) {
struct hfs_find_data fd;
hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
@ -155,7 +155,7 @@ static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd, struct in
WARN_ON(!mutex_is_locked(&hip->extents_lock));
if (hip->flags & HFSPLUS_FLG_EXT_DIRTY)
if (hip->extent_state & HFSPLUS_EXT_DIRTY)
__hfsplus_ext_write_extent(inode, fd);
res = __hfsplus_ext_read_extent(fd, hip->cached_extents, inode->i_ino,
@ -167,7 +167,7 @@ static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd, struct in
hip->cached_blocks = hfsplus_ext_block_count(hip->cached_extents);
} else {
hip->cached_start = hip->cached_blocks = 0;
hip->flags &= ~(HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW);
hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
}
return res;
}
@ -429,7 +429,7 @@ int hfsplus_file_extend(struct inode *inode)
start, len);
if (!res) {
hfsplus_dump_extent(hip->cached_extents);
hip->flags |= HFSPLUS_FLG_EXT_DIRTY;
hip->extent_state |= HFSPLUS_EXT_DIRTY;
hip->cached_blocks += len;
} else if (res == -ENOSPC)
goto insert_extent;
@ -450,7 +450,7 @@ int hfsplus_file_extend(struct inode *inode)
hip->cached_extents[0].start_block = cpu_to_be32(start);
hip->cached_extents[0].block_count = cpu_to_be32(len);
hfsplus_dump_extent(hip->cached_extents);
hip->flags |= HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW;
hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW;
hip->cached_start = hip->alloc_blocks;
hip->cached_blocks = len;
@ -513,12 +513,12 @@ void hfsplus_file_truncate(struct inode *inode)
alloc_cnt - start, alloc_cnt - blk_cnt);
hfsplus_dump_extent(hip->cached_extents);
if (blk_cnt > start) {
hip->flags |= HFSPLUS_FLG_EXT_DIRTY;
hip->extent_state |= HFSPLUS_EXT_DIRTY;
break;
}
alloc_cnt = start;
hip->cached_start = hip->cached_blocks = 0;
hip->flags &= ~(HFSPLUS_FLG_EXT_DIRTY | HFSPLUS_FLG_EXT_NEW);
hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
hfs_brec_remove(&fd);
}
hfs_find_exit(&fd);

18
fs/hfsplus/hfsplus_fs.h
View File

@ -171,7 +171,7 @@ struct hfsplus_inode_info {
u32 cached_blocks;
hfsplus_extent_rec first_extents;
hfsplus_extent_rec cached_extents;
unsigned long flags;
unsigned int extent_state;
struct mutex extents_lock;
/*
@ -185,6 +185,11 @@ struct hfsplus_inode_info {
*/
u32 linkid;
/*
* Accessed using atomic bitops.
*/
unsigned long flags;
/*
* Protected by i_mutex.
*/
@ -196,12 +201,13 @@ struct hfsplus_inode_info {
struct inode vfs_inode;
};
#define HFSPLUS_FLG_RSRC 0x0001
#define HFSPLUS_FLG_EXT_DIRTY 0x0002
#define HFSPLUS_FLG_EXT_NEW 0x0004
#define HFSPLUS_EXT_DIRTY 0x0001
#define HFSPLUS_EXT_NEW 0x0002
#define HFSPLUS_IS_DATA(inode) (!(HFSPLUS_I(inode)->flags & HFSPLUS_FLG_RSRC))
#define HFSPLUS_IS_RSRC(inode) (HFSPLUS_I(inode)->flags & HFSPLUS_FLG_RSRC)
#define HFSPLUS_I_RSRC 0 /* represents a resource fork */
#define HFSPLUS_IS_RSRC(inode) \
test_bit(HFSPLUS_I_RSRC, &HFSPLUS_I(inode)->flags)
struct hfs_find_data {
/* filled by caller */

9
fs/hfsplus/inode.c
View File

@ -190,7 +190,9 @@ static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dent
inode->i_ino = dir->i_ino;
INIT_LIST_HEAD(&hip->open_dir_list);
mutex_init(&hip->extents_lock);
hip->flags = HFSPLUS_FLG_RSRC;
hip->extent_state = 0;
hip->flags = 0;
set_bit(HFSPLUS_I_RSRC, &hip->flags);
hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
err = hfsplus_find_cat(sb, dir->i_ino, &fd);
@ -369,6 +371,7 @@ struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
INIT_LIST_HEAD(&hip->open_dir_list);
mutex_init(&hip->extents_lock);
atomic_set(&hip->opencnt, 0);
hip->extent_state = 0;
hip->flags = 0;
memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
@ -498,8 +501,8 @@ int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
sizeof(struct hfsplus_cat_file));
hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
&file->data_fork : &file->rsrc_fork);
hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
&file->rsrc_fork : &file->data_fork);
hfsplus_get_perms(inode, &file->permissions, 0);
inode->i_nlink = 1;
if (S_ISREG(inode->i_mode)) {

1
fs/hfsplus/super.c
View File

@ -66,6 +66,7 @@ struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
mutex_init(&HFSPLUS_I(inode)->extents_lock);
HFSPLUS_I(inode)->flags = 0;
HFSPLUS_I(inode)->extent_state = 0;
HFSPLUS_I(inode)->rsrc_inode = NULL;
atomic_set(&HFSPLUS_I(inode)->opencnt, 0);