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| author |   Ross Zwisler <zwisler@kernel.org> | 2018-09-11 13:31:16 -0400 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2018-09-11 13:31:16 -0400 |
| commit | b1f382178d150f256c1cf95b9341fda6eb764459 (patch) | |
| tree | a0d4c289912c4150b948abd2729980d85d3e9ade /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | ext4: fix online resizing for bigalloc file systems with a 1k block size (diff) | |
| download | wireguard-linux-b1f382178d150f256c1cf95b9341fda6eb764459.tar.xz wireguard-linux-b1f382178d150f256c1cf95b9341fda6eb764459.zip | |
ext4: close race between direct IO and ext4_break_layouts()
If the refcount of a page is lowered between the time that it is returned
by dax_busy_page() and when the refcount is again checked in
ext4_break_layouts() => ___wait_var_event(), the waiting function
ext4_wait_dax_page() will never be called. This means that
ext4_break_layouts() will still have 'retry' set to false, so we'll stop
looping and never check the refcount of other pages in this inode.
Instead, always continue looping as long as dax_layout_busy_page() gives us
a page which it found with an elevated refcount.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions