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| author | Jan Kara <jack@suse.com> | 2015-12-07 14:34:49 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-12-07 14:34:49 -0500 |
| commit | 011278485ecc3cd2a3954b5d4c73101d919bf1fa (patch) | |
| tree | 740938e00aa0c972db386b5576656e646c02e36d /fs/ext4/extents.c | |
| parent | 32ebffd3bbb4162da5ff88f9a35dd32d0a28ea70 (diff) | |
| download | linux-stable-011278485ecc3cd2a3954b5d4c73101d919bf1fa.tar.gz linux-stable-011278485ecc3cd2a3954b5d4c73101d919bf1fa.tar.bz2 linux-stable-011278485ecc3cd2a3954b5d4c73101d919bf1fa.zip | |
ext4: fix races of writeback with punch hole and zero range
When doing delayed allocation, update of on-disk inode size is postponed
until IO submission time. However hole punch or zero range fallocate
calls can end up discarding the tail page cache page and thus on-disk
inode size would never be properly updated.
Make sure the on-disk inode size is updated before truncating page
cache.
Signed-off-by: Jan Kara <jack@suse.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 4b105c96df08..3578b25fccfd 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4847,6 +4847,11 @@ 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_update_disksize_before_punch(inode, offset, len); + if (ret) { + up_write(&EXT4_I(inode)->i_mmap_sem); + goto out_dio; + } /* Now release the pages and zero block aligned part of pages */ truncate_pagecache_range(inode, start, end - 1); inode->i_mtime = inode->i_ctime = ext4_current_time(inode); |