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authorMiklos Szeredi <mszeredi@suse.cz>2012-03-05 15:48:11 +0100
committerMiklos Szeredi <mszeredi@suse.cz>2012-03-05 15:48:11 +0100
commitac45d61357e86b9a0cf14e45e8e09dfb626970ef (patch)
treee560d3a8f26d1530780ed62f2a4bd3f16a20ac55 /fs/fuse
parent192cfd58774b4d17b2fe8bdc77d89c2ef4e0591d (diff)
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fuse: fix nlink after unlink
Anand Avati reports that the following sequence of system calls fail on a fuse filesystem: create("filename") => 0 link("filename", "linkname") => 0 unlink("filename") => 0 link("linkname", "filename") => -ENOENT ### BUG ### vfs_link() fails with ENOENT if i_nlink is zero, this is done to prevent resurrecting already deleted files. Fuse clears i_nlink on unlink even if there are other links pointing to the file. Reported-by: Anand Avati <avati@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/dir.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 206632887bb..da379070fab 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -644,13 +644,12 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
fuse_put_request(fc, req);
if (!err) {
struct inode *inode = entry->d_inode;
+ struct fuse_inode *fi = get_fuse_inode(inode);
- /*
- * Set nlink to zero so the inode can be cleared, if the inode
- * does have more links this will be discovered at the next
- * lookup/getattr.
- */
- clear_nlink(inode);
+ spin_lock(&fc->lock);
+ fi->attr_version = ++fc->attr_version;
+ drop_nlink(inode);
+ spin_unlock(&fc->lock);
fuse_invalidate_attr(inode);
fuse_invalidate_attr(dir);
fuse_invalidate_entry_cache(entry);
@@ -762,8 +761,17 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
will reflect changes in the backing inode (link count,
etc.)
*/
- if (!err || err == -EINTR)
+ if (!err) {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
+ spin_lock(&fc->lock);
+ fi->attr_version = ++fc->attr_version;
+ inc_nlink(inode);
+ spin_unlock(&fc->lock);
fuse_invalidate_attr(inode);
+ } else if (err == -EINTR) {
+ fuse_invalidate_attr(inode);
+ }
return err;
}