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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2023-08-30 22:09:36 +0200 |
|---|---|---|
| committer | Andreas Gruenbacher <agruenba@redhat.com> | 2023-09-05 15:58:17 +0200 |
| commit | e3da6be3d70449a1f14c99f13cc1eb453a2be4ea (patch) | |
| tree | 8fd68f3768e75c0f0c48f29602bfefd76647e2fd /lib/zstd/decompress | |
| parent | fe0690f0a6f190a9ec0736c01ddeba7a729cf30d (diff) | |
gfs2: Fix withdraw race
Function gfs2_withdraw() tries to synchronize concurrent callers by
atomically setting the SDF_WITHDRAWN flag in the first caller, setting
the SDF_WITHDRAW_IN_PROG flag to indicate that a withdraw is in
progress, performing the actual withdraw, and clearing the
SDF_WITHDRAW_IN_PROG flag when done. All other callers wait for the
SDF_WITHDRAW_IN_PROG flag to be cleared before returning.
This leaves a small window in which callers can find the SDF_WITHDRAWN
flag set before the SDF_WITHDRAW_IN_PROG flag has been set, causing them
to return prematurely, before the withdraw has been completed.
Fix that by setting the SDF_WITHDRAWN and SDF_WITHDRAW_IN_PROG flags
atomically.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'lib/zstd/decompress')
0 files changed, 0 insertions, 0 deletions