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>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 8ce6fd5..72a361d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4826,6 +4826,13 @@ static long ext4_zero_range(struct file *file, loff_t offset,
* released from page cache.
*/
down_write(&EXT4_I(inode)->i_mmap_sem);
+
+ ret = ext4_break_layouts(inode);
+ if (ret) {
+ up_write(&EXT4_I(inode)->i_mmap_sem);
+ goto out_mutex;
+ }
+
ret = ext4_update_disksize_before_punch(inode, offset, len);
if (ret) {
up_write(&EXT4_I(inode)->i_mmap_sem);
@@ -5499,6 +5506,11 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
* page cache.
*/
down_write(&EXT4_I(inode)->i_mmap_sem);
+
+ ret = ext4_break_layouts(inode);
+ if (ret)
+ goto out_mmap;
+
/*
* Need to round down offset to be aligned with page size boundary
* for page size > block size.
@@ -5647,6 +5659,11 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len)
* page cache.
*/
down_write(&EXT4_I(inode)->i_mmap_sem);
+
+ ret = ext4_break_layouts(inode);
+ if (ret)
+ goto out_mmap;
+
/*
* Need to round down to align start offset to page size boundary
* for page size > block size.