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authorAl Viro <viro@zeniv.linux.org.uk>2016-05-12 20:13:50 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-12 20:13:50 -0400
commit9717a91b01feda644f45fd63624a641385ef8f2d (patch)
treec2abccf2e761596b361146de3041143f7db21c29 /fs/hfs
parent323ee8fc544d407eb053471b9607f95f987f5f12 (diff)
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hfs: switch to ->iterate_shared()
exact parallel of hfsplus analogue Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/hfs')
-rw-r--r--fs/hfs/catalog.c3
-rw-r--r--fs/hfs/dir.c12
-rw-r--r--fs/hfs/hfs_fs.h1
-rw-r--r--fs/hfs/inode.c2
4 files changed, 15 insertions, 3 deletions
diff --git a/fs/hfs/catalog.c b/fs/hfs/catalog.c
index 1eb5d415d434..98cde8ba5dc2 100644
--- a/fs/hfs/catalog.c
+++ b/fs/hfs/catalog.c
@@ -240,10 +240,13 @@ int hfs_cat_delete(u32 cnid, struct inode *dir, struct qstr *str)
}
}
+ /* we only need to take spinlock for exclusion with ->release() */
+ spin_lock(&HFS_I(dir)->open_dir_lock);
list_for_each_entry(rd, &HFS_I(dir)->open_dir_list, list) {
if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
rd->file->f_pos--;
}
+ spin_unlock(&HFS_I(dir)->open_dir_lock);
res = hfs_brec_remove(&fd);
if (res)
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index e9f2b855f831..163190ecc0d2 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -161,8 +161,14 @@ static int hfs_readdir(struct file *file, struct dir_context *ctx)
}
file->private_data = rd;
rd->file = file;
+ spin_lock(&HFS_I(inode)->open_dir_lock);
list_add(&rd->list, &HFS_I(inode)->open_dir_list);
+ spin_unlock(&HFS_I(inode)->open_dir_lock);
}
+ /*
+ * Can be done after the list insertion; exclusion with
+ * hfs_delete_cat() is provided by directory lock.
+ */
memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
out:
hfs_find_exit(&fd);
@@ -173,9 +179,9 @@ static int hfs_dir_release(struct inode *inode, struct file *file)
{
struct hfs_readdir_data *rd = file->private_data;
if (rd) {
- inode_lock(inode);
+ spin_lock(&HFS_I(inode)->open_dir_lock);
list_del(&rd->list);
- inode_unlock(inode);
+ spin_unlock(&HFS_I(inode)->open_dir_lock);
kfree(rd);
}
return 0;
@@ -303,7 +309,7 @@ static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
const struct file_operations hfs_dir_operations = {
.read = generic_read_dir,
- .iterate = hfs_readdir,
+ .iterate_shared = hfs_readdir,
.llseek = generic_file_llseek,
.release = hfs_dir_release,
};
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index 79daa097929a..fa3eed86837c 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -69,6 +69,7 @@ struct hfs_inode_info {
struct hfs_cat_key cat_key;
struct list_head open_dir_list;
+ spinlock_t open_dir_lock;
struct inode *rsrc_inode;
struct mutex extents_lock;
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index cb1e5faa2fb7..ba533c79a806 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -187,6 +187,7 @@ struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, umode_t mode)
mutex_init(&HFS_I(inode)->extents_lock);
INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
+ spin_lock_init(&HFS_I(inode)->open_dir_lock);
hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
inode->i_ino = HFS_SB(sb)->next_id++;
inode->i_mode = mode;
@@ -318,6 +319,7 @@ static int hfs_read_inode(struct inode *inode, void *data)
HFS_I(inode)->rsrc_inode = NULL;
mutex_init(&HFS_I(inode)->extents_lock);
INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
+ spin_lock_init(&HFS_I(inode)->open_dir_lock);
/* Initialize the inode */
inode->i_uid = hsb->s_uid;