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author | Jan Kara <jack@suse.com> | 2015-12-07 19:31:11 (GMT) |
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committer | Theodore Ts'o <tytso@mit.edu> | 2015-12-07 19:31:11 (GMT) |
commit | 32ebffd3bbb4162da5ff88f9a35dd32d0a28ea70 (patch) | |
tree | 11d7854acb61128821b948796d1eb2e2f87b925f /fs/ext4/ext4.h | |
parent | 17048e8a083fec7ad841d88ef0812707fbc7e39f (diff) | |
download | linux-32ebffd3bbb4162da5ff88f9a35dd32d0a28ea70.tar.xz |
ext4: fix races between buffered IO and collapse / insert range
Current code implementing FALLOC_FL_COLLAPSE_RANGE and
FALLOC_FL_INSERT_RANGE is prone to races with buffered writes and page
faults. If buffered write or write via mmap manages to squeeze between
filemap_write_and_wait_range() and truncate_pagecache() in the fallocate
implementations, the written data is simply discarded by
truncate_pagecache() although it should have been shifted.
Fix the problem by moving filemap_write_and_wait_range() call inside
i_mutex and i_mmap_sem. That way we are protected against races with
both buffered writes and page faults.
Signed-off-by: Jan Kara <jack@suse.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
0 files changed, 0 insertions, 0 deletions