mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro: "Fixes for mountpoint_last() bugs (by converting to use of lookup_last()) and an autofs regression fix from this cycle (caused by follow_managed() breakage introduced in barrier fixes series)" * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fix autofs regression caused by follow_managed() changes reimplement path_mountpoint() with less magic
This commit is contained in:
commit
84bf39461e
90
fs/namei.c
90
fs/namei.c
@ -1232,6 +1232,7 @@ static int follow_managed(struct path *path, struct nameidata *nd)
|
||||
BUG_ON(!path->dentry->d_op);
|
||||
BUG_ON(!path->dentry->d_op->d_manage);
|
||||
ret = path->dentry->d_op->d_manage(path, false);
|
||||
flags = smp_load_acquire(&path->dentry->d_flags);
|
||||
if (ret < 0)
|
||||
break;
|
||||
}
|
||||
@ -1649,17 +1650,15 @@ again:
|
||||
if (IS_ERR(dentry))
|
||||
return dentry;
|
||||
if (unlikely(!d_in_lookup(dentry))) {
|
||||
if (!(flags & LOOKUP_NO_REVAL)) {
|
||||
int error = d_revalidate(dentry, flags);
|
||||
if (unlikely(error <= 0)) {
|
||||
if (!error) {
|
||||
d_invalidate(dentry);
|
||||
dput(dentry);
|
||||
goto again;
|
||||
}
|
||||
int error = d_revalidate(dentry, flags);
|
||||
if (unlikely(error <= 0)) {
|
||||
if (!error) {
|
||||
d_invalidate(dentry);
|
||||
dput(dentry);
|
||||
dentry = ERR_PTR(error);
|
||||
goto again;
|
||||
}
|
||||
dput(dentry);
|
||||
dentry = ERR_PTR(error);
|
||||
}
|
||||
} else {
|
||||
old = inode->i_op->lookup(inode, dentry, flags);
|
||||
@ -2617,72 +2616,6 @@ int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
|
||||
}
|
||||
EXPORT_SYMBOL(user_path_at_empty);
|
||||
|
||||
/**
|
||||
* mountpoint_last - look up last component for umount
|
||||
* @nd: pathwalk nameidata - currently pointing at parent directory of "last"
|
||||
*
|
||||
* This is a special lookup_last function just for umount. In this case, we
|
||||
* need to resolve the path without doing any revalidation.
|
||||
*
|
||||
* The nameidata should be the result of doing a LOOKUP_PARENT pathwalk. Since
|
||||
* mountpoints are always pinned in the dcache, their ancestors are too. Thus,
|
||||
* in almost all cases, this lookup will be served out of the dcache. The only
|
||||
* cases where it won't are if nd->last refers to a symlink or the path is
|
||||
* bogus and it doesn't exist.
|
||||
*
|
||||
* Returns:
|
||||
* -error: if there was an error during lookup. This includes -ENOENT if the
|
||||
* lookup found a negative dentry.
|
||||
*
|
||||
* 0: if we successfully resolved nd->last and found it to not to be a
|
||||
* symlink that needs to be followed.
|
||||
*
|
||||
* 1: if we successfully resolved nd->last and found it to be a symlink
|
||||
* that needs to be followed.
|
||||
*/
|
||||
static int
|
||||
mountpoint_last(struct nameidata *nd)
|
||||
{
|
||||
int error = 0;
|
||||
struct dentry *dir = nd->path.dentry;
|
||||
struct path path;
|
||||
|
||||
/* If we're in rcuwalk, drop out of it to handle last component */
|
||||
if (nd->flags & LOOKUP_RCU) {
|
||||
if (unlazy_walk(nd))
|
||||
return -ECHILD;
|
||||
}
|
||||
|
||||
nd->flags &= ~LOOKUP_PARENT;
|
||||
|
||||
if (unlikely(nd->last_type != LAST_NORM)) {
|
||||
error = handle_dots(nd, nd->last_type);
|
||||
if (error)
|
||||
return error;
|
||||
path.dentry = dget(nd->path.dentry);
|
||||
} else {
|
||||
path.dentry = d_lookup(dir, &nd->last);
|
||||
if (!path.dentry) {
|
||||
/*
|
||||
* No cached dentry. Mounted dentries are pinned in the
|
||||
* cache, so that means that this dentry is probably
|
||||
* a symlink or the path doesn't actually point
|
||||
* to a mounted dentry.
|
||||
*/
|
||||
path.dentry = lookup_slow(&nd->last, dir,
|
||||
nd->flags | LOOKUP_NO_REVAL);
|
||||
if (IS_ERR(path.dentry))
|
||||
return PTR_ERR(path.dentry);
|
||||
}
|
||||
}
|
||||
if (d_flags_negative(smp_load_acquire(&path.dentry->d_flags))) {
|
||||
dput(path.dentry);
|
||||
return -ENOENT;
|
||||
}
|
||||
path.mnt = nd->path.mnt;
|
||||
return step_into(nd, &path, 0, d_backing_inode(path.dentry), 0);
|
||||
}
|
||||
|
||||
/**
|
||||
* path_mountpoint - look up a path to be umounted
|
||||
* @nd: lookup context
|
||||
@ -2699,14 +2632,17 @@ path_mountpoint(struct nameidata *nd, unsigned flags, struct path *path)
|
||||
int err;
|
||||
|
||||
while (!(err = link_path_walk(s, nd)) &&
|
||||
(err = mountpoint_last(nd)) > 0) {
|
||||
(err = lookup_last(nd)) > 0) {
|
||||
s = trailing_symlink(nd);
|
||||
}
|
||||
if (!err && (nd->flags & LOOKUP_RCU))
|
||||
err = unlazy_walk(nd);
|
||||
if (!err)
|
||||
err = handle_lookup_down(nd);
|
||||
if (!err) {
|
||||
*path = nd->path;
|
||||
nd->path.mnt = NULL;
|
||||
nd->path.dentry = NULL;
|
||||
follow_mount(path);
|
||||
}
|
||||
terminate_walk(nd);
|
||||
return err;
|
||||
|
@ -206,7 +206,6 @@ TRACE_DEFINE_ENUM(LOOKUP_AUTOMOUNT);
|
||||
TRACE_DEFINE_ENUM(LOOKUP_PARENT);
|
||||
TRACE_DEFINE_ENUM(LOOKUP_REVAL);
|
||||
TRACE_DEFINE_ENUM(LOOKUP_RCU);
|
||||
TRACE_DEFINE_ENUM(LOOKUP_NO_REVAL);
|
||||
TRACE_DEFINE_ENUM(LOOKUP_OPEN);
|
||||
TRACE_DEFINE_ENUM(LOOKUP_CREATE);
|
||||
TRACE_DEFINE_ENUM(LOOKUP_EXCL);
|
||||
@ -224,7 +223,6 @@ TRACE_DEFINE_ENUM(LOOKUP_DOWN);
|
||||
{ LOOKUP_PARENT, "PARENT" }, \
|
||||
{ LOOKUP_REVAL, "REVAL" }, \
|
||||
{ LOOKUP_RCU, "RCU" }, \
|
||||
{ LOOKUP_NO_REVAL, "NO_REVAL" }, \
|
||||
{ LOOKUP_OPEN, "OPEN" }, \
|
||||
{ LOOKUP_CREATE, "CREATE" }, \
|
||||
{ LOOKUP_EXCL, "EXCL" }, \
|
||||
|
@ -34,7 +34,6 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
|
||||
|
||||
/* internal use only */
|
||||
#define LOOKUP_PARENT 0x0010
|
||||
#define LOOKUP_NO_REVAL 0x0080
|
||||
#define LOOKUP_JUMPED 0x1000
|
||||
#define LOOKUP_ROOT 0x2000
|
||||
#define LOOKUP_ROOT_GRABBED 0x0008
|
||||
|
Loading…
Reference in New Issue
Block a user