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VFS: Handle lower layer dentry/inode in pathwalk

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Make use of d_backing_inode() in pathwalk to gain access to an
inode or dentry that's on a lower layer.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2015-05-06 15:59:00 +01:00 committed by Al Viro
parent 237d8b327a
commit 63afdfc781
2 changed files with 6 additions and 6 deletions
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10
fs/namei.c
View File

@ -1423,7 +1423,7 @@ static int lookup_fast(struct nameidata *nd,
* This sequence count validates that the inode matches
* the dentry name information from lookup.
*/
*inode = dentry->d_inode;
*inode = d_backing_inode(dentry);
negative = d_is_negative(dentry);
if (read_seqcount_retry(&dentry->d_seq, seq))
return -ECHILD;
@ -1483,7 +1483,7 @@ static int lookup_fast(struct nameidata *nd,
path->dentry = dentry;
err = follow_managed(path, nd);
if (likely(!err))
*inode = path->dentry->d_inode;
*inode = d_backing_inode(path->dentry);
return err;
need_lookup:
@ -1618,7 +1618,7 @@ static int walk_component(struct nameidata *nd, int flags)
if (err < 0)
return err;
inode = path.dentry->d_inode;
inode = d_backing_inode(path.dentry);
seq = 0; /* we are already out of RCU mode */
err = -ENOENT;
if (d_is_negative(path.dentry))
@ -2471,7 +2471,7 @@ EXPORT_SYMBOL(__check_sticky);
*/
static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
{
struct inode *inode = victim->d_inode;
struct inode *inode = d_backing_inode(victim);
int error;
if (d_is_negative(victim))
@ -3054,7 +3054,7 @@ static int do_last(struct nameidata *nd,
return error;
BUG_ON(nd->flags & LOOKUP_RCU);
inode = path.dentry->d_inode;
inode = d_backing_inode(path.dentry);
seq = 0; /* out of RCU mode, so the value doesn't matter */
if (unlikely(d_is_negative(path.dentry))) {
path_to_nameidata(&path, nd);

2
fs/open.c
View File

@ -367,7 +367,7 @@ SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode)
if (res)
goto out;
inode = path.dentry->d_inode;
inode = d_backing_inode(path.dentry);
if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
/*