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authorEric Van Hensbergen <ericvh@gmail.com>2020-09-23 17:11:43 +0300
committerDominique Martinet <asmadeus@codewreck.org>2020-11-03 11:29:31 +0300
commit154372e67d4053e56591245eb413686621941333 (patch)
treee89780e1785ebaebfd068566c549bbd6e3230642 /fs/9p/fid.c
parent3cea11cd5e3b00d91caf0b4730194039b45c5891 (diff)
downloadlinux-154372e67d4053e56591245eb413686621941333.tar.xz
fs/9p: fix create-unlink-getattr idiom
Fixes several outstanding bug reports of not being able to getattr from an open file after an unlink. This patch cleans up transient fids on an unlink and will search open fids on a client if it detects a dentry that appears to have been unlinked. This search is necessary because fstat does not pass fd information through the VFS API to the filesystem, only the dentry which for 9p has an imperfect match to fids. Inherent in this patch is also a fix for the qid handling on create/open which apparently wasn't being set correctly and was necessary for the search to succeed. A possible optimization over this fix is to include accounting of open fids with the inode in the private data (in a similar fashion to the way we track transient fids with dentries). This would allow a much quicker search for a matching open fid. (changed v9fs_fid_find_global to v9fs_fid_find_inode in comment) Link: http://lkml.kernel.org/r/20200923141146.90046-2-jianyong.wu@arm.com Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Jianyong Wu <jianyong.wu@arm.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Diffstat (limited to 'fs/9p/fid.c')
-rw-r--r--fs/9p/fid.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 3d681a2c2731..3304984c0fad 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -39,6 +39,33 @@ void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
}
/**
+ * v9fs_fid_find_inode - search for a fid off of the client list
+ * @inode: return a fid pointing to a specific inode
+ * @uid: return a fid belonging to the specified user
+ *
+ */
+
+static struct p9_fid *v9fs_fid_find_inode(struct inode *inode, kuid_t uid)
+{
+ struct p9_client *clnt = v9fs_inode2v9ses(inode)->clnt;
+ struct p9_fid *fid, *fidptr, *ret = NULL;
+ unsigned long flags;
+
+ p9_debug(P9_DEBUG_VFS, " inode: %p\n", inode);
+
+ spin_lock_irqsave(&clnt->lock, flags);
+ list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
+ if (uid_eq(fid->uid, uid) &&
+ (inode->i_ino == v9fs_qid2ino(&fid->qid))) {
+ ret = fid;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&clnt->lock, flags);
+ return ret;
+}
+
+/**
* v9fs_fid_find - retrieve a fid that belongs to the specified uid
* @dentry: dentry to look for fid in
* @uid: return fid that belongs to the specified user
@@ -65,6 +92,9 @@ 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;