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authorMiklos Szeredi <mszeredi@suse.cz>2008-07-25 01:48:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:48 -0700
commit0de6256daafa3a97a269995e9b29f956bd419bbf (patch)
treef71f080b3a895d25e6b956de72220e1e03464751 /fs/fuse
parent764c76b371722e0cba5c24d91225f0f954b69d44 (diff)
downloadconfigs-0de6256daafa3a97a269995e9b29f956bd419bbf.tar.gz
fuse: prepare lookup for nfs export
Use d_splice_alias() instead of d_add() in fuse lookup code, to allow NFS exporting. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/dir.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 2060bf06b90..e5217b213b4 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -239,18 +239,20 @@ int fuse_valid_type(int m)
* Add a directory inode to a dentry, ensuring that no other dentry
* refers to this inode. Called with fc->inst_mutex.
*/
-static int fuse_d_add_directory(struct dentry *entry, struct inode *inode)
+static struct dentry *fuse_d_add_directory(struct dentry *entry,
+ struct inode *inode)
{
struct dentry *alias = d_find_alias(inode);
- if (alias) {
+ if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
/* This tries to shrink the subtree below alias */
fuse_invalidate_entry(alias);
dput(alias);
if (!list_empty(&inode->i_dentry))
- return -EBUSY;
+ return ERR_PTR(-EBUSY);
+ } else {
+ dput(alias);
}
- d_add(entry, inode);
- return 0;
+ return d_splice_alias(inode, entry);
}
static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
@@ -259,6 +261,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
int err;
struct fuse_entry_out outarg;
struct inode *inode = NULL;
+ struct dentry *newent;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_req *forget_req;
@@ -303,21 +306,22 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
if (inode && S_ISDIR(inode->i_mode)) {
mutex_lock(&fc->inst_mutex);
- err = fuse_d_add_directory(entry, inode);
+ newent = fuse_d_add_directory(entry, inode);
mutex_unlock(&fc->inst_mutex);
- if (err) {
+ if (IS_ERR(newent)) {
iput(inode);
- return ERR_PTR(err);
+ return newent;
}
} else
- d_add(entry, inode);
+ newent = d_splice_alias(inode, entry);
+ entry = newent ? newent : entry;
entry->d_op = &fuse_dentry_operations;
if (!err)
fuse_change_entry_timeout(entry, &outarg);
else
fuse_invalidate_entry_cache(entry);
- return NULL;
+ return newent;
}
/*