Commit b5872b0d authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
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[PATCH] knfsd: nfsd4: fix acl xattr length return

We should be using the length from the second vfs_getxattr, in case it
changed.  (Note: there's still a small race here; we could end up returning
-ENOMEM if the length increased between the first and second call.  I don't
know whether it's worth spending a lot of effort to fix that.)

This makes XFS ACLs usable on NFS exports, which they currently aren't, since
XFS appears to be returning a too-large value for vfs_getxattr() when it's
passed a NULL buffer.  So there's probably an XFS bug here too, though since
getxattr with a NULL buffer is usually used to decide how much memory to
allocate, it may be a fairly harmless bug in most cases.
Signed-off-by: default avatarJ. Bruce Fields <>
Signed-off-by: default avatarNeil Brown <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent b905b7b0
......@@ -371,7 +371,6 @@ out_nfserr:
static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
ssize_t buflen;
int error;
buflen = vfs_getxattr(dentry, key, NULL, 0);
if (buflen <= 0)
......@@ -381,10 +380,7 @@ static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
if (!*buf)
return -ENOMEM;
error = vfs_getxattr(dentry, key, *buf, buflen);
if (error < 0)
return error;
return buflen;
return vfs_getxattr(dentry, key, *buf, buflen);
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