shaba/lvm2
1
0
Fork 0
mirror of git://sourceware.org/git/lvm2.git synced 2025-08-04 12:22:00 +03:00
Code Releases Activity

lvmetad: Make token_mismatch handling more robust in the clients.

Browse Source
This commit is contained in:
Petr Rockai
2014-02-26 15:11:00 +01:00
parent 4143b284f8
commit 1769eddde7
1 changed files with 21 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
lib/cache/lvmetad.c vendored
View File

@ -159,12 +159,27 @@ retry:
daemon_request_destroy(req); daemon_request_destroy(req);
if (!repl.error && !strcmp(daemon_reply_str(repl, "response", ""), "token_mismatch") && if (!repl.error && !strcmp(daemon_reply_str(repl, "response", ""), "token_mismatch") &&
try < 2 && !test_mode()) { try < 60 && !test_mode()) {
if (lvmetad_pvscan_all_devs(_lvmetad_cmd, NULL)) { /*
++ try; * If another process is trying to scan, they might have the
daemon_reply_destroy(repl); * same future token id and it's better to wait and avoid doing
goto retry; * the work multiple times. For the case the future token is
} * different, the wait is randomized so that multiple waiting
* processes do not start scanning all at once.
*
* If the token is mismatched because of global_filter changes,
* we re-scan immediately, but if we lose the potential race for
* the update, we back off for a short while (0.2-2 seconds) and
* try again.
*/
if (!strcmp(daemon_reply_str(repl, "expected", ""), "update in progress") || try % 5)
usleep( 50000 + random() % 450000 ); /* 0.05 - 0.5s */
else
/* If the re-scan fails here, we try again later. */
lvmetad_pvscan_all_devs(_lvmetad_cmd, NULL);
++ try;
daemon_reply_destroy(repl);
goto retry;
} }
return repl; return repl;