Merge tag 'v3.12-rc5' into stable/for-linus-3.13

Linux 3.12-rc5

Because the Stefano branch (for SWIOTLB ARM changes) is based on that.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

* tag 'v3.12-rc5': (550 commits)
  Linux 3.12-rc5
  watchdog: sunxi: Fix section mismatch
  watchdog: kempld_wdt: Fix bit mask definition
  watchdog: ts72xx_wdt: locking bug in ioctl
  ARM: exynos: dts: Update 5250 arch timer node with clock frequency
  parisc: let probe_kernel_read() capture access to page zero
  parisc: optimize variable initialization in do_page_fault
  parisc: fix interruption handler to respect pagefault_disable()
  parisc: mark parisc_terminate() noreturn and cold.
  parisc: remove unused syscall_ipi() function.
  parisc: kill SMP single function call interrupt
  parisc: Export flush_cache_page() (needed by lustre)
  vfs: allow O_PATH file descriptors for fstatfs()
  ext4: fix memory leak in xattr
  ARC: Ignore ptrace SETREGSET request for synthetic register "stop_pc"
  ALSA: hda - Sony VAIO Pro 13 (haswell) now has a working headset jack
  ALSA: hda - Add a headset mic model for ALC269 and friends
  ALSA: hda - Fix microphone for Sony VAIO Pro 13 (Haswell model)
  compiler/gcc4: Add quirk for 'asm goto' miscompilation bug
  Revert "i915: Update VGA arbiter support for newer devices"
  ...

1 files changed, 13 insertions, 7 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 62b43b577bf..b7989f2ab4c 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -182,6 +182,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 	struct inode *inode;
 	struct dentry *parent;
 	struct fuse_conn *fc;
+	struct fuse_inode *fi;
 	int ret;
 
 	inode = ACCESS_ONCE(entry->d_inode);
@@ -228,7 +229,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 		if (!err && !outarg.nodeid)
 			err = -ENOENT;
 		if (!err) {
-			struct fuse_inode *fi = get_fuse_inode(inode);
+			fi = get_fuse_inode(inode);
 			if (outarg.nodeid != get_node_id(inode)) {
 				fuse_queue_forget(fc, forget, outarg.nodeid, 1);
 				goto invalid;
@@ -246,8 +247,11 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 				       attr_version);
 		fuse_change_entry_timeout(entry, &outarg);
 	} else if (inode) {
-		fc = get_fuse_conn(inode);
-		if (fc->readdirplus_auto) {
+		fi = get_fuse_inode(inode);
+		if (flags & LOOKUP_RCU) {
+			if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
+				return -ECHILD;
+		} else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
 			parent = dget_parent(entry);
 			fuse_advise_use_readdirplus(parent->d_inode);
 			dput(parent);
@@ -259,7 +263,8 @@ out:
 
 invalid:
 	ret = 0;
-	if (check_submounts_and_drop(entry) != 0)
+
+	if (!(flags & LOOKUP_RCU) && check_submounts_and_drop(entry) != 0)
 		ret = 1;
 	goto out;
 }
@@ -1063,6 +1068,8 @@ static int fuse_access(struct inode *inode, int mask)
 	struct fuse_access_in inarg;
 	int err;
 
+	BUG_ON(mask & MAY_NOT_BLOCK);
+
 	if (fc->no_access)
 		return 0;
 
@@ -1150,9 +1157,6 @@ static int fuse_permission(struct inode *inode, int mask)
 		   noticed immediately, only after the attribute
 		   timeout has expired */
 	} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
-		if (mask & MAY_NOT_BLOCK)
-			return -ECHILD;
-
 		err = fuse_access(inode, mask);
 	} else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
 		if (!(inode->i_mode & S_IXUGO)) {
@@ -1291,6 +1295,8 @@ static int fuse_direntplus_link(struct file *file,
 	}
 
 found:
+	if (fc->readdirplus_auto)
+		set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
 	fuse_change_entry_timeout(dentry, o);
 
 	err = 0;