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| author | Yigal Korman <[email protected]> | 2015-11-16 12:09:15 +0000 |
|---|---|---|
| committer | Dan Williams <[email protected]> | 2015-11-19 00:54:36 +0000 |
| commit | 0df9d41ab5d43dc5b20abc8b22a6b6d098b03994 (patch) | |
| tree | 3c0c6a9a65867eeca00eab356dde7c1fbfcd2556 /net/unix/af_unix.c | |
| parent | dax: disable pmd mappings (diff) | |
| download | kernel-0df9d41ab5d43dc5b20abc8b22a6b6d098b03994.tar.gz kernel-0df9d41ab5d43dc5b20abc8b22a6b6d098b03994.zip | |
mm, dax: fix DAX deadlocks (COW fault)
DAX handling of COW faults has wrong locking sequence:
dax_fault does i_mmap_lock_read
do_cow_fault does i_mmap_unlock_write
Ross's commit[1] missed a fix[2] that Kirill added to Matthew's
commit[3].
Original COW locking logic was introduced by Matthew here[4].
This should be applied to v4.3 as well.
[1] 0f90cc6609c7 mm, dax: fix DAX deadlocks
[2] 52a2b53ffde6 mm, dax: use i_mmap_unlock_write() in do_cow_fault()
[3] 843172978bb9 dax: fix race between simultaneous faults
[4] 2e4cdab0584f mm: allow page fault handlers to perform the COW
Cc: <[email protected]>
Cc: Boaz Harrosh <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Acked-by: Ross Zwisler <[email protected]>
Signed-off-by: Yigal Korman <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions