The patch titled
fuse: prepare lookup for nfs export
has been added to the -mm tree. Its filename is
fuse-prepare-lookup-for-nfs-export.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: fuse: prepare lookup for nfs export
From: Miklos Szeredi <mszeredi@xxxxxxx>
Use d_splice_alias() instead of d_add() in fuse lookup code, to allow NFS
exporting.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fuse/dir.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff -puN fs/fuse/dir.c~fuse-prepare-lookup-for-nfs-export fs/fuse/dir.c
--- a/fs/fuse/dir.c~fuse-prepare-lookup-for-nfs-export
+++ a/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
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
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;
}
/*
_
Patches currently in -mm which might be from mszeredi@xxxxxxx are
origin.patch
mm-fix-infinite-loop-in-filemap_fault.patch
git-vfs-cleanups.patch
lockd-dont-return-eagain-for-a-permanent-error.patch
locks-add-special-return-value-for-asynchronous-locks.patch
locks-cleanup-code-duplication.patch
locks-allow-lock-to-return-file_lock_deferred.patch
fuse-prepare-lookup-for-nfs-export.patch
fuse-add-export-operations.patch
fuse-add-fuse_lookup_name-helper.patch
fuse-nfs-export-special-lookups.patch
fuse-lockd-support.patch
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