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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:29 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:20 +1100
commitec2447c278ee973d35f38e53ca16ba7f965ae33d (patch)
tree5d17a0523c301b8c71c0f198ffe7782c5e9c0ea9 /fs/hostfs
parentb1e6a015a580ad145689ad1d6b4aa0e03e6c868b (diff)
downloadop-kernel-dev-ec2447c278ee973d35f38e53ca16ba7f965ae33d.zip
op-kernel-dev-ec2447c278ee973d35f38e53ca16ba7f965ae33d.tar.gz
hostfs: simplify locking
Remove dcache_lock locking from hostfs filesystem, and move it into dcache helpers. All that is required is a coherent path name. Protection from concurrent modification of the namespace after path name generation is not provided in current code, because dcache_lock is dropped before the path is used. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/hostfs')
-rw-r--r--fs/hostfs/hostfs_kern.c24
1 files changed, 10 insertions, 14 deletions
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index cfe8bc7..39dc505 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -92,12 +92,10 @@ __uml_setup("hostfs=", hostfs_args,
static char *__dentry_name(struct dentry *dentry, char *name)
{
- char *p = __dentry_path(dentry, name, PATH_MAX);
+ char *p = dentry_path_raw(dentry, name, PATH_MAX);
char *root;
size_t len;
- spin_unlock(&dcache_lock);
-
root = dentry->d_sb->s_fs_info;
len = strlen(root);
if (IS_ERR(p)) {
@@ -123,25 +121,23 @@ static char *dentry_name(struct dentry *dentry)
if (!name)
return NULL;
- spin_lock(&dcache_lock);
return __dentry_name(dentry, name); /* will unlock */
}
static char *inode_name(struct inode *ino)
{
struct dentry *dentry;
- char *name = __getname();
- if (!name)
- return NULL;
+ char *name;
- spin_lock(&dcache_lock);
- if (list_empty(&ino->i_dentry)) {
- spin_unlock(&dcache_lock);
- __putname(name);
+ dentry = d_find_alias(ino);
+ if (!dentry)
return NULL;
- }
- dentry = list_first_entry(&ino->i_dentry, struct dentry, d_alias);
- return __dentry_name(dentry, name); /* will unlock */
+
+ name = dentry_name(dentry);
+
+ dput(dentry);
+
+ return name;
}
static char *follow_link(char *link)
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