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[PATCH] md: helper function to match commands written to sysfs files

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Commands written to sysfs files may, or my not, be \n terminated.  We want to
accept with case.  For this we use cmd_match.

Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-01-06 00:20:41 -08:00 committed by Linus Torvalds
parent 1345b1d8ad
commit bce74dac08
1 changed files with 24 additions and 5 deletions
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29
drivers/md/md.c
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@ -1525,6 +1525,26 @@ repeat:
}
/* words written to sysfs files may, or my not, be \n terminated.
* We want to accept with case. For this we use cmd_match.
*/
static int cmd_match(const char *cmd, const char *str)
{
/* See if cmd, written into a sysfs file, matches
* str. They must either be the same, or cmd can
* have a trailing newline
*/
while (*cmd && *str && *cmd == *str) {
cmd++;
str++;
}
if (*cmd == '\n')
cmd++;
if (*str || *cmd)
return 0;
return 1;
}
struct rdev_sysfs_entry {
struct attribute attr;
ssize_t (*show)(mdk_rdev_t *, char *);
@ -1799,7 +1819,7 @@ action_store(mddev_t *mddev, const char *page, size_t len)
if (!mddev->pers || !mddev->pers->sync_request)
return -EINVAL;
if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) {
if (cmd_match(page, "idle")) {
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_unregister_thread(mddev->sync_thread);
@ -1812,13 +1832,12 @@ action_store(mddev_t *mddev, const char *page, size_t len)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
return -EBUSY;
if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 ||
strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0)
if (cmd_match(page, "resync") || cmd_match(page, "recover"))
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
else {
if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
if (cmd_match(page, "check"))
set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
else if (cmd_match(page, "repair"))
return -EINVAL;
set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);