Merge commit 'v4.16-rc4~0' into patchwork

* commit 'v4.16-rc4~0': (900 commits)
  Linux 4.16-rc4
  memremap: fix softlockup reports at teardown
  libnvdimm: re-enable deep flush for pmem devices via fsync()
  MAINTAINERS: take over Kconfig maintainership
  vfio: disable filesystem-dax page pinning
  kconfig: fix line number in recursive inclusion error message
  Coccinelle: memdup: Fix typo in warning messages
  i2c: octeon: Prevent error message on bus error
  parisc: Reduce irq overhead when run in qemu
  parisc: Use cr16 interval timers unconditionally on qemu
  parisc: Check if secondary CPUs want own PDC calls
  parisc: Hide virtual kernel memory layout
  parisc: Fix ordering of cache and TLB flushes
  kconfig: Update ncurses package names for menuconfig
  kbuild/kallsyms: trivial typo fix
  kbuild: test --build-id linker flag by ld-option instead of cc-ldoption
  kbuild: drop superfluous GCC_PLUGINS_CFLAGS assignment
  kconfig: Don't leak choice names during parsing
  sh: fix build error for empty CONFIG_BUILTIN_DTB_SOURCE
  kconfig: set SYMBOL_AUTO to the symbol marked with defconfig_list
  ...

1 files changed, 23 insertions, 20 deletions

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 86863792f36a..86d6a4435c87 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -716,7 +716,7 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
 	__be64 *ptr;
 	sector_t lblock;
 	sector_t lend;
-	int ret;
+	int ret = 0;
 	int eob;
 	unsigned int len;
 	struct buffer_head *bh;
@@ -728,12 +728,14 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
 		goto out;
 	}
 
-	if ((flags & IOMAP_REPORT) && gfs2_is_stuffed(ip)) {
-		gfs2_stuffed_iomap(inode, iomap);
-		if (pos >= iomap->length)
-			return -ENOENT;
-		ret = 0;
-		goto out;
+	if (gfs2_is_stuffed(ip)) {
+		if (flags & IOMAP_REPORT) {
+			gfs2_stuffed_iomap(inode, iomap);
+			if (pos >= iomap->length)
+				ret = -ENOENT;
+			goto out;
+		}
+		BUG_ON(!(flags & IOMAP_WRITE));
 	}
 
 	lblock = pos >> inode->i_blkbits;
@@ -744,7 +746,7 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
 	iomap->type = IOMAP_HOLE;
 	iomap->length = (u64)(lend - lblock) << inode->i_blkbits;
 	iomap->flags = IOMAP_F_MERGED;
-	bmap_lock(ip, 0);
+	bmap_lock(ip, flags & IOMAP_WRITE);
 
 	/*
 	 * Directory data blocks have a struct gfs2_meta_header header, so the
@@ -787,27 +789,28 @@ int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
 		iomap->flags |= IOMAP_F_BOUNDARY;
 	iomap->length = (u64)len << inode->i_blkbits;
 
-	ret = 0;
-
 out_release:
 	release_metapath(&mp);
-	bmap_unlock(ip, 0);
+	bmap_unlock(ip, flags & IOMAP_WRITE);
 out:
 	trace_gfs2_iomap_end(ip, iomap, ret);
 	return ret;
 
 do_alloc:
-	if (!(flags & IOMAP_WRITE)) {
-		if (pos >= i_size_read(inode)) {
+	if (flags & IOMAP_WRITE) {
+		ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
+	} else if (flags & IOMAP_REPORT) {
+		loff_t size = i_size_read(inode);
+		if (pos >= size)
 			ret = -ENOENT;
-			goto out_release;
-		}
-		ret = 0;
-		iomap->length = hole_size(inode, lblock, &mp);
-		goto out_release;
+		else if (height <= ip->i_height)
+			iomap->length = hole_size(inode, lblock, &mp);
+		else
+			iomap->length = size - pos;
+	} else {
+		if (height <= ip->i_height)
+			iomap->length = hole_size(inode, lblock, &mp);
 	}
-
-	ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
 	goto out_release;
 }