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

Browse Source 
Pull vfs fixes from Al Viro:
 "The sget() one is a long-standing bug and will need to go into -stable
  (in fact, it had been originally caught in RHEL6), the other two are
  3.11-only"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  vfs: constify dentry parameter in d_count()
  livelock avoidance in sget()
  allow O_TMPFILE to work with O_WRONLY
This commit is contained in:
Linus Torvalds 2013-07-20 10:50:01 -07:00
commit 36231d255b
4 changed files with 15 additions and 18 deletions
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2
fs/open.c
View File

@ -844,6 +844,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
if ((flags & O_TMPFILE_MASK) != O_TMPFILE)
return -EINVAL;
acc_mode = MAY_OPEN | ACC_MODE(flags);
if (!(acc_mode & MAY_WRITE))
return -EINVAL;
} else if (flags & O_PATH) {
/*
* If we have O_PATH in the open flag. Then we

25
fs/super.c
View File

@ -336,19 +336,19 @@ EXPORT_SYMBOL(deactivate_super);
* and want to turn it into a full-blown active reference. grab_super()
* is called with sb_lock held and drops it. Returns 1 in case of
* success, 0 if we had failed (superblock contents was already dead or
* dying when grab_super() had been called).
* dying when grab_super() had been called). Note that this is only
* called for superblocks not in rundown mode (== ones still on ->fs_supers
* of their type), so increment of ->s_count is OK here.
*/
static int grab_super(struct super_block *s) __releases(sb_lock)
{
if (atomic_inc_not_zero(&s->s_active)) {
spin_unlock(&sb_lock);
return 1;
}
/* it's going away */
s->s_count++;
spin_unlock(&sb_lock);
/* wait for it to die */
down_write(&s->s_umount);
if ((s->s_flags & MS_BORN) && atomic_inc_not_zero(&s->s_active)) {
put_super(s);
return 1;
}
up_write(&s->s_umount);
put_super(s);
return 0;
@ -463,11 +463,6 @@ retry:
destroy_super(s);
s = NULL;
}
down_write(&old->s_umount);
if (unlikely(!(old->s_flags & MS_BORN))) {
deactivate_locked_super(old);
goto retry;
}
return old;
}
}
@ -660,10 +655,10 @@ restart:
if (hlist_unhashed(&sb->s_instances))
continue;
if (sb->s_bdev == bdev) {
if (grab_super(sb)) /* drops sb_lock */
return sb;
else
if (!grab_super(sb))
goto restart;
up_write(&sb->s_umount);
return sb;
}
}
spin_unlock(&sb_lock);

2
include/linux/dcache.h
View File

@ -324,7 +324,7 @@ static inline int __d_rcu_to_refcount(struct dentry *dentry, unsigned seq)
return ret;
}
static inline unsigned d_count(struct dentry *dentry)
static inline unsigned d_count(const struct dentry *dentry)
{
return dentry->d_count;
}

4
include/uapi/asm-generic/fcntl.h
View File

@ -89,8 +89,8 @@
#endif
/* a horrid kludge trying to make sure that this will fail on old kernels */
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY | O_RDWR)
#define O_TMPFILE_MASK (__O_TMPFILE | O_DIRECTORY | O_CREAT | O_ACCMODE)
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
#define O_TMPFILE_MASK (__O_TMPFILE | O_DIRECTORY | O_CREAT)
#ifndef O_NDELAY
#define O_NDELAY O_NONBLOCK