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| author | Ross Zwisler <[email protected]> | 2018-09-11 17:31:16 +0000 |
|---|---|---|
| committer | Theodore Ts'o <[email protected]> | 2018-09-11 17:31:16 +0000 |
| commit | b1f382178d150f256c1cf95b9341fda6eb764459 (patch) | |
| tree | a0d4c289912c4150b948abd2729980d85d3e9ade /tools/perf/scripts/python/intel-pt-events.py | |
| parent | ext4: fix online resizing for bigalloc file systems with a 1k block size (diff) | |
| download | kernel-b1f382178d150f256c1cf95b9341fda6eb764459.tar.gz kernel-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 <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Cc: [email protected]
Diffstat (limited to 'tools/perf/scripts/python/intel-pt-events.py')
0 files changed, 0 insertions, 0 deletions