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authorLinus Torvalds2010-10-28 12:13:00 -0700
committerLinus Torvalds2010-10-28 12:13:00 -0700
commitf063a0c0c995d010960efcc1b2ed14b99674f25c (patch)
tree106e30acd1a58b3cf9f3c15abe1de83f1919e03b /fs/autofs/waitq.c
parent3c3762957818dc902222733a8184f23102e24472 (diff)
parent5af634789c93b97cfb314a102436716be8fbc577 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6: (841 commits) Staging: brcm80211: fix usage of roundup in structures Staging: bcm: fix up network device reference counting Staging: keucr: fix up US_ macro change staging: brcm80211: brcmfmac: Removed codeversion from firmware filenames. staging: brcm80211: Remove unnecessary header files. staging: brcm80211: Remove unnecessary includes from bcmutils.c staging: brcm80211: Removed unnecessary pktsetprio() function. Staging: brcm80211: remove typedefs.h Staging: brcm80211: remove uintptr typedef usage Staging: hv: remove struct vmbus_channel_interface Staging: hv: remove Open from struct vmbus_channel_interface Staging: hv: storvsc: call vmbus_open directly Staging: hv: netvsc: call vmbus_open directly Staging: hv: channel: export vmbus_open to modules Staging: hv: remove Close from struct vmbus_channel_interface Staging: hv: netvsc: call vmbus_close directly Staging: hv: storvsc: call vmbus_close directly Staging: hv: channel: export vmbus_close to modules Staging: hv: remove SendPacket from struct vmbus_channel_interface Staging: hv: storvsc: call vmbus_sendpacket directly ... Fix up conflicts in drivers/staging/cx25821/cx25821-audio-upstream.c drivers/staging/cx25821/cx25821-audio.h due to warring whitespace cleanups (neither of which were all that great)
Diffstat (limited to 'fs/autofs/waitq.c')
-rw-r--r--fs/autofs/waitq.c205
1 files changed, 0 insertions, 205 deletions
diff --git a/fs/autofs/waitq.c b/fs/autofs/waitq.c
deleted file mode 100644
index be46805972f0..000000000000
--- a/fs/autofs/waitq.c
+++ /dev/null
@@ -1,205 +0,0 @@
-/* -*- linux-c -*- --------------------------------------------------------- *
- *
- * linux/fs/autofs/waitq.c
- *
- * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- *
- * ------------------------------------------------------------------------- */
-
-#include <linux/slab.h>
-#include <linux/time.h>
-#include <linux/signal.h>
-#include <linux/file.h>
-#include "autofs_i.h"
-
-/* We make this a static variable rather than a part of the superblock; it
- is better if we don't reassign numbers easily even across filesystems */
-static autofs_wqt_t autofs_next_wait_queue = 1;
-
-/* These are the signals we allow interrupting a pending mount */
-#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT))
-
-void autofs_catatonic_mode(struct autofs_sb_info *sbi)
-{
- struct autofs_wait_queue *wq, *nwq;
-
- DPRINTK(("autofs: entering catatonic mode\n"));
-
- sbi->catatonic = 1;
- wq = sbi->queues;
- sbi->queues = NULL; /* Erase all wait queues */
- while ( wq ) {
- nwq = wq->next;
- wq->status = -ENOENT; /* Magic is gone - report failure */
- kfree(wq->name);
- wq->name = NULL;
- wake_up(&wq->queue);
- wq = nwq;
- }
- fput(sbi->pipe); /* Close the pipe */
- sbi->pipe = NULL;
- autofs_hash_dputall(&sbi->dirhash); /* Remove all dentry pointers */
-}
-
-static int autofs_write(struct file *file, const void *addr, int bytes)
-{
- unsigned long sigpipe, flags;
- mm_segment_t fs;
- const char *data = (const char *)addr;
- ssize_t wr = 0;
-
- /** WARNING: this is not safe for writing more than PIPE_BUF bytes! **/
-
- sigpipe = sigismember(&current->pending.signal, SIGPIPE);
-
- /* Save pointer to user space and point back to kernel space */
- fs = get_fs();
- set_fs(KERNEL_DS);
-
- while (bytes &&
- (wr = file->f_op->write(file,data,bytes,&file->f_pos)) > 0) {
- data += wr;
- bytes -= wr;
- }
-
- set_fs(fs);
-
- /* Keep the currently executing process from receiving a
- SIGPIPE unless it was already supposed to get one */
- if (wr == -EPIPE && !sigpipe) {
- spin_lock_irqsave(&current->sighand->siglock, flags);
- sigdelset(&current->pending.signal, SIGPIPE);
- recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
- }
-
- return (bytes > 0);
-}
-
-static void autofs_notify_daemon(struct autofs_sb_info *sbi, struct autofs_wait_queue *wq)
-{
- struct autofs_packet_missing pkt;
-
- DPRINTK(("autofs_wait: wait id = 0x%08lx, name = ", wq->wait_queue_token));
- autofs_say(wq->name,wq->len);
-
- memset(&pkt,0,sizeof pkt); /* For security reasons */
-
- pkt.hdr.proto_version = AUTOFS_PROTO_VERSION;
- pkt.hdr.type = autofs_ptype_missing;
- pkt.wait_queue_token = wq->wait_queue_token;
- pkt.len = wq->len;
- memcpy(pkt.name, wq->name, pkt.len);
- pkt.name[pkt.len] = '\0';
-
- if ( autofs_write(sbi->pipe,&pkt,sizeof(struct autofs_packet_missing)) )
- autofs_catatonic_mode(sbi);
-}
-
-int autofs_wait(struct autofs_sb_info *sbi, struct qstr *name)
-{
- struct autofs_wait_queue *wq;
- int status;
-
- /* In catatonic mode, we don't wait for nobody */
- if ( sbi->catatonic )
- return -ENOENT;
-
- /* We shouldn't be able to get here, but just in case */
- if ( name->len > NAME_MAX )
- return -ENOENT;
-
- for ( wq = sbi->queues ; wq ; wq = wq->next ) {
- if ( wq->hash == name->hash &&
- wq->len == name->len &&
- wq->name && !memcmp(wq->name,name->name,name->len) )
- break;
- }
-
- if ( !wq ) {
- /* Create a new wait queue */
- wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL);
- if ( !wq )
- return -ENOMEM;
-
- wq->name = kmalloc(name->len,GFP_KERNEL);
- if ( !wq->name ) {
- kfree(wq);
- return -ENOMEM;
- }
- wq->wait_queue_token = autofs_next_wait_queue++;
- init_waitqueue_head(&wq->queue);
- wq->hash = name->hash;
- wq->len = name->len;
- wq->status = -EINTR; /* Status return if interrupted */
- memcpy(wq->name, name->name, name->len);
- wq->next = sbi->queues;
- sbi->queues = wq;
-
- /* autofs_notify_daemon() may block */
- wq->wait_ctr = 2;
- autofs_notify_daemon(sbi,wq);
- } else
- wq->wait_ctr++;
-
- /* wq->name is NULL if and only if the lock is already released */
-
- if ( sbi->catatonic ) {
- /* We might have slept, so check again for catatonic mode */
- wq->status = -ENOENT;
- kfree(wq->name);
- wq->name = NULL;
- }
-
- if ( wq->name ) {
- /* Block all but "shutdown" signals while waiting */
- sigset_t sigmask;
-
- siginitsetinv(&sigmask, SHUTDOWN_SIGS);
- sigprocmask(SIG_BLOCK, &sigmask, &sigmask);
-
- interruptible_sleep_on(&wq->queue);
-
- sigprocmask(SIG_SETMASK, &sigmask, NULL);
- } else {
- DPRINTK(("autofs_wait: skipped sleeping\n"));
- }
-
- status = wq->status;
-
- if ( ! --wq->wait_ctr ) /* Are we the last process to need status? */
- kfree(wq);
-
- return status;
-}
-
-
-int autofs_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_token, int status)
-{
- struct autofs_wait_queue *wq, **wql;
-
- for (wql = &sbi->queues; (wq = *wql) != NULL; wql = &wq->next) {
- if ( wq->wait_queue_token == wait_queue_token )
- break;
- }
- if ( !wq )
- return -EINVAL;
-
- *wql = wq->next; /* Unlink from chain */
- kfree(wq->name);
- wq->name = NULL; /* Do not wait on this queue */
-
- wq->status = status;
-
- if ( ! --wq->wait_ctr ) /* Is anyone still waiting for this guy? */
- kfree(wq);
- else
- wake_up(&wq->queue);
-
- return 0;
-}
-