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OpenCloudOS-Kernel
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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 

Pull vfs fixes from Al Viro:
 "A couple of fixes (-stable fodder) + dead code removal after the
  overlayfs fix.

  I agree that it's better to separate from the fix part to make
  backporting easier, but IMO it's not worth delaying said dead code
  removal until the next window"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  Don't reset ->total_link_count on nested calls of vfs_path_lookup()
  ovl: get rid of the dead code left from broken (and disabled) optimizations
  ovl: fix permission checking for setattr
This commit is contained in:
Linus Torvalds 2015-12-06 13:51:49 -08:00
parent fb7b26e47e 2788cc47f4
commit d8cd93ea67
4 changed files with 15 additions and 31 deletions
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1
fs/namei.c
View File

@ -1996,7 +1996,6 @@ static const char *path_init(struct nameidata *nd, unsigned flags)
nd->last_type = LAST_ROOT; /* if there are only slashes... */
nd->flags = flags | LOOKUP_JUMPED | LOOKUP_PARENT;
nd->depth = 0;
nd->total_link_count = 0;
if (flags & LOOKUP_ROOT) {
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;

23
fs/overlayfs/copy_up.c
View File

@ -195,8 +195,7 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
struct dentry *dentry, struct path *lowerpath,
struct kstat *stat, struct iattr *attr,
const char *link)
struct kstat *stat, const char *link)
{
struct inode *wdir = workdir->d_inode;
struct inode *udir = upperdir->d_inode;
@ -240,8 +239,6 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
mutex_lock(&newdentry->d_inode->i_mutex);
err = ovl_set_attr(newdentry, stat);
if (!err && attr)
err = notify_change(newdentry, attr, NULL);
mutex_unlock(&newdentry->d_inode->i_mutex);
if (err)
goto out_cleanup;
@ -286,8 +283,7 @@ out_cleanup:
* that point the file will have already been copied up anyway.
*/
int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
struct path *lowerpath, struct kstat *stat,
struct iattr *attr)
struct path *lowerpath, struct kstat *stat)
{
struct dentry *workdir = ovl_workdir(dentry);
int err;
@ -345,26 +341,19 @@ int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
}
upperdentry = ovl_dentry_upper(dentry);
if (upperdentry) {
unlock_rename(workdir, upperdir);
/* Raced with another copy-up? Nothing to do, then... */
err = 0;
/* Raced with another copy-up? Do the setattr here */
if (attr) {
mutex_lock(&upperdentry->d_inode->i_mutex);
err = notify_change(upperdentry, attr, NULL);
mutex_unlock(&upperdentry->d_inode->i_mutex);
}
goto out_put_cred;
goto out_unlock;
}
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
stat, attr, link);
stat, link);
if (!err) {
/* Restore timestamps on parent (best effort) */
ovl_set_timestamps(upperdir, &pstat);
}
out_unlock:
unlock_rename(workdir, upperdir);
out_put_cred:
revert_creds(old_cred);
put_cred(override_cred);
@ -406,7 +395,7 @@ int ovl_copy_up(struct dentry *dentry)
ovl_path_lower(next, &lowerpath);
err = vfs_getattr(&lowerpath, &stat);
if (!err)
err = ovl_copy_up_one(parent, next, &lowerpath, &stat, NULL);
err = ovl_copy_up_one(parent, next, &lowerpath, &stat);
dput(parent);
dput(next);

19
fs/overlayfs/inode.c
View File

@ -12,8 +12,7 @@
#include <linux/xattr.h>
#include "overlayfs.h"
static int ovl_copy_up_last(struct dentry *dentry, struct iattr *attr,
bool no_data)
static int ovl_copy_up_truncate(struct dentry *dentry)
{
int err;
struct dentry *parent;
@ -30,10 +29,8 @@ static int ovl_copy_up_last(struct dentry *dentry, struct iattr *attr,
if (err)
goto out_dput_parent;
if (no_data)
stat.size = 0;
err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat, attr);
stat.size = 0;
err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat);
out_dput_parent:
dput(parent);
@ -49,13 +46,13 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr)
if (err)
goto out;
upperdentry = ovl_dentry_upper(dentry);
if (upperdentry) {
err = ovl_copy_up(dentry);
if (!err) {
upperdentry = ovl_dentry_upper(dentry);
mutex_lock(&upperdentry->d_inode->i_mutex);
err = notify_change(upperdentry, attr, NULL);
mutex_unlock(&upperdentry->d_inode->i_mutex);
} else {
err = ovl_copy_up_last(dentry, attr, false);
}
ovl_drop_write(dentry);
out:
@ -353,7 +350,7 @@ struct inode *ovl_d_select_inode(struct dentry *dentry, unsigned file_flags)
return ERR_PTR(err);
if (file_flags & O_TRUNC)
err = ovl_copy_up_last(dentry, NULL, true);
err = ovl_copy_up_truncate(dentry);
else
err = ovl_copy_up(dentry);
ovl_drop_write(dentry);

3
fs/overlayfs/overlayfs.h
View File

@ -194,7 +194,6 @@ void ovl_cleanup(struct inode *dir, struct dentry *dentry);
/* copy_up.c */
int ovl_copy_up(struct dentry *dentry);
int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
struct path *lowerpath, struct kstat *stat,
struct iattr *attr);
struct path *lowerpath, struct kstat *stat);
int ovl_copy_xattr(struct dentry *old, struct dentry *new);
int ovl_set_attr(struct dentry *upper, struct kstat *stat);