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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2018-07-29 17:00:22 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-07-29 17:00:22 -0400 |
| commit | 430657b6be896db57d974375cc499ca212c7f01d (patch) | |
| tree | ba4489c4000ac7946de998f9f6a5cd2a3834d283 /fs/ext4/extents.c | |
| parent | cdbf8897cb09b7baf2b8a7e78051a35a872b01d5 (diff) | |
| download | lwn-430657b6be896db57d974375cc499ca212c7f01d.tar.gz lwn-430657b6be896db57d974375cc499ca212c7f01d.zip | |
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/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 8ce6fd5b10dd..72a361d5ef74 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. |