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nfsd: treat all shutdown signals as equivalent 

knfsd currently uses 2 signal masks when processing requests. A "loose"
mask (SHUTDOWN_SIGS) that it uses when receiving network requests, and
then a more "strict" mask (ALLOWED_SIGS, which is just SIGKILL) that it
allows when doing the actual operation on the local storage.

This is apparently unnecessarily complicated. The underlying filesystem
should be able to sanely handle a signal in the middle of an operation.
This patch removes the signal mask handling from knfsd altogether. When
knfsd is started as a kthread, all signals are ignored. It then allows
all of the signals in SHUTDOWN_SIGS. There's no need to set the mask
as well.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Jeff Layton 2008-06-30 14:09:46 -04:00 committed by J. Bruce Fields
parent 3cd2cfeae1
commit 100766f834
1 changed files with 5 additions and 25 deletions
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30
fs/nfsd/nfssvc.c
View File

@ -37,15 +37,6 @@
#define NFSDDBG_FACILITY NFSDDBG_SVC
/* these signals will be delivered to an nfsd thread
* when handling a request
*/
#define ALLOWED_SIGS (sigmask(SIGKILL))
/* these signals will be delivered to an nfsd thread
* when not handling a request. i.e. when waiting
*/
#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT))
extern struct svc_program nfsd_program;
static int nfsd(void *vrqstp);
struct timeval nfssvc_boot;
@ -414,9 +405,7 @@ nfsd(void *vrqstp)
{
struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
struct fs_struct *fsp;
sigset_t shutdown_mask, allowed_mask;
int err, preverr = 0;
unsigned int signo;
/* Lock module and set up kernel thread */
mutex_lock(&nfsd_mutex);
@ -433,17 +422,14 @@ nfsd(void *vrqstp)
current->fs = fsp;
current->fs->umask = 0;
siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
siginitsetinv(&allowed_mask, ALLOWED_SIGS);
/*
* thread is spawned with all signals set to SIG_IGN, re-enable
* the ones that matter
* the ones that will bring down the thread
*/
for (signo = 1; signo <= _NSIG; signo++) {
if (!sigismember(&shutdown_mask, signo))
allow_signal(signo);
}
allow_signal(SIGKILL);
allow_signal(SIGHUP);
allow_signal(SIGINT);
allow_signal(SIGQUIT);
nfsdstats.th_cnt++;
mutex_unlock(&nfsd_mutex);
@ -460,9 +446,6 @@ nfsd(void *vrqstp)
* The main request loop
*/
for (;;) {
/* Block all but the shutdown signals */
sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
/*
* Find a socket with data available and call its
* recvfrom routine.
@ -487,9 +470,6 @@ nfsd(void *vrqstp)
/* Lock the export hash tables for reading. */
exp_readlock();
/* Process request with signals blocked. */
sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
svc_process(rqstp);
/* Unlock export hash tables */