From 22e424feb6658c5d6789e45121830357809c59cb Mon Sep 17 00:00:00 2001 From: Dominique Martinet Date: Sat, 29 Jan 2022 18:42:59 +0900 Subject: Revert "fs/9p: search open fids first" This reverts commit 478ba09edc1f2f2ee27180a06150cb2d1a686f9c. That commit was meant as a fix for setattrs with by fd (e.g. ftruncate) to use an open fid instead of the first fid it found on lookup. The proper fix for that is to use the fid associated with the open file struct, available in iattr->ia_file for such operations, and was actually done just before in 66246641609b ("9p: retrieve fid from file when file instance exist.") As such, this commit is no longer required. Furthermore, changing lookup to return open fids first had unwanted side effects, as it turns out the protocol forbids the use of open fids for further walks (e.g. clone_fid) and we broke mounts for some servers enforcing this rule. Note this only reverts to the old working behaviour, but it's still possible for lookup to return open fids if dentry->d_fsdata is not set, so more work is needed to make sure we respect this rule in the future, for example by adding a flag to the lookup functions to only match certain fid open modes depending on caller requirements. Link: https://lkml.kernel.org/r/20220130130651.712293-1-asmadeus@codewreck.org Fixes: 478ba09edc1f ("fs/9p: search open fids first") Cc: stable@vger.kernel.org # v5.11+ Reported-by: ron minnich Reported-by: ng@0x80.stream Signed-off-by: Dominique Martinet --- fs/9p/fid.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/fs/9p/fid.c b/fs/9p/fid.c index 6aab046c98e2..79df61fe0e59 100644 --- a/fs/9p/fid.c +++ b/fs/9p/fid.c @@ -96,12 +96,8 @@ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any) dentry, dentry, from_kuid(&init_user_ns, uid), any); ret = NULL; - - if (d_inode(dentry)) - ret = v9fs_fid_find_inode(d_inode(dentry), uid); - /* we'll recheck under lock if there's anything to look in */ - if (!ret && dentry->d_fsdata) { + if (dentry->d_fsdata) { struct hlist_head *h = (struct hlist_head *)&dentry->d_fsdata; spin_lock(&dentry->d_lock); @@ -113,6 +109,9 @@ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any) } } spin_unlock(&dentry->d_lock); + } else { + if (dentry->d_inode) + ret = v9fs_fid_find_inode(dentry->d_inode, uid); } return ret; -- cgit v1.2.3