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author | Ross Zwisler <zwisler@kernel.org> | 2018-09-11 13:31:16 -0400 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2018-09-11 13:31:16 -0400 |
commit | b1f382178d150f256c1cf95b9341fda6eb764459 (patch) | |
tree | a0d4c289912c4150b948abd2729980d85d3e9ade /fs/ext4/mmp.c | |
parent | 5f8c10936fab2b69a487400f2872902e597dd320 (diff) | |
download | linux-b1f382178d150f256c1cf95b9341fda6eb764459.tar.gz |
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 'fs/ext4/mmp.c')
0 files changed, 0 insertions, 0 deletions