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Groups > linux.kernel > #1499967

[PATCH v6 01/17] ext4: allow DAX writeback for hole punch

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Currently when doing a DAX hole punch with ext4 we fail to do a writeback.
This is because the logic around filemap_write_and_wait_range() in
ext4_punch_hole() only looks for dirty page cache pages in the radix tree,
not for dirty DAX exceptional entries.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: <stable@vger.kernel.org>
---
 fs/ext4/inode.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 3131747..0900cb4 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3890,7 +3890,7 @@ int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
 }
 
 /*
- * ext4_punch_hole: punches a hole in a file by releaseing the blocks
+ * ext4_punch_hole: punches a hole in a file by releasing the blocks
  * associated with the given offset and length
  *
  * @inode:  File inode
@@ -3919,7 +3919,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
 	 * Write out all dirty pages to avoid race conditions
 	 * Then release them.
 	 */
-	if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+	if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
 		ret = filemap_write_and_wait_range(mapping, offset,
 						   offset + length - 1);
 		if (ret)
-- 
2.9.0

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[PATCH v6 00/17] re-enable DAX PMD support Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 13/17] dax: move RADIX_DAX_* defines to dax.h Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 11/17] dax: add dax_iomap_sector() helper function Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 10/17] dax: correct dax iomap code namespace Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 14/17] dax: move put_(un)locked_mapping_entry() in dax.c Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
    Re: [PATCH v6 14/17] dax: move put_(un)locked_mapping_entry() in  dax.c Jan Kara <jack@suse.cz> - 2016-10-13 17:20 +0200
  [PATCH v6 16/17] xfs: use struct iomap based DAX PMD fault path Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 05/17] dax: make 'wait_table' global variable static Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 12/17] dax: dax_iomap_fault() needs to call iomap_end() Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 07/17] dax: consistent variable naming for DAX entries Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 08/17] dax: coordinate locking for offsets in PMD range Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 02/17] ext4: tell DAX the size of allocation holes Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 01/17] ext4: allow DAX writeback for hole punch Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
  [PATCH v6 17/17] dax: remove "depends on BROKEN" from FS_DAX_PMD Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200
    Re: [PATCH v6 17/17] dax: remove "depends on BROKEN" from FS_DAX_PMD Jan Kara <jack@suse.cz> - 2016-10-13 17:50 +0200
    Re: [PATCH v6 17/17] dax: remove "depends on BROKEN" from FS_DAX_PMD "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2016-10-17 08:00 +0200
      Re: [PATCH v6 17/17] dax: remove "depends on BROKEN" from FS_DAX_PMD Jan Kara <jack@suse.cz> - 2016-10-17 11:20 +0200
  [PATCH v6 06/17] dax: remove the last BUG_ON() from fs/dax.c Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-10-13 01:00 +0200

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