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authorRoss Zwisler <ross.zwisler@linux.intel.com>2018-07-29 17:00:22 -0400
committerTheodore Ts'o <tytso@mit.edu>2018-07-29 17:00:22 -0400
commit430657b6be896db57d974375cc499ca212c7f01d (patch)
treeba4489c4000ac7946de998f9f6a5cd2a3834d283 /fs/ext4/truncate.h
parentcdbf8897cb09b7baf2b8a7e78051a35a872b01d5 (diff)
ext4: handle layout changes to pinned DAX mappings
Follow the lead of xfs_break_dax_layouts() and add synchronization between operations in ext4 which remove blocks from an inode (hole punch, truncate down, etc.) and pages which are pinned due to DAX DMA operations. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Diffstat (limited to 'fs/ext4/truncate.h')
-rw-r--r--fs/ext4/truncate.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/truncate.h b/fs/ext4/truncate.h
index 0cb13badf473..bcbe3668c1d4 100644
--- a/fs/ext4/truncate.h
+++ b/fs/ext4/truncate.h
@@ -11,6 +11,10 @@
*/
static inline void ext4_truncate_failed_write(struct inode *inode)
{
+ /*
+ * We don't need to call ext4_break_layouts() because the blocks we
+ * are truncating were never visible to userspace.
+ */
down_write(&EXT4_I(inode)->i_mmap_sem);
truncate_inode_pages(inode->i_mapping, inode->i_size);
ext4_truncate(inode);