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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 06:04:44 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 17:37:18 -0400
commit232b14328050a4639130b0dec185f43968e72035 (patch)
treeeb3b525278bd3efd5403bc4f5cfb3e41614d40c4
parent2776365370b579afc36cff14dc70a567b66f0378 (diff)
freezer: do not sync filesystems from freeze_processes
The syncing of filesystems from within the freezer is generally not needed. Also, if there's an ext3 filesystem loopback-mounted from a FUSE one, the syncing results in writes to it and deadlocks. Similarly, it will deadlock if FUSE implements sync. Change freeze_processes() so that it doesn't execute sys_sync() and make the suspend and hibernation code path sync filesystems independently of the freezer. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Nigel Cunningham <nigel@nigel.suspend2.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/power/disk.c4
-rw-r--r--kernel/power/main.c6
-rw-r--r--kernel/power/process.c1
-rw-r--r--kernel/power/user.c4
4 files changed, 14 insertions, 1 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 9348d95a4fb8..555c0f0b2f7e 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -313,6 +313,10 @@ int hibernate(void)
313 if (error) 313 if (error)
314 goto Exit; 314 goto Exit;
315 315
316 printk("Syncing filesystems ... ");
317 sys_sync();
318 printk("done.\n");
319
316 error = prepare_processes(); 320 error = prepare_processes();
317 if (error) 321 if (error)
318 goto Finish; 322 goto Finish;
diff --git a/kernel/power/main.c b/kernel/power/main.c
index fb2412e7a0ce..3cdf95b1dc92 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -20,6 +20,7 @@
20#include <linux/resume-trace.h> 20#include <linux/resume-trace.h>
21#include <linux/freezer.h> 21#include <linux/freezer.h>
22#include <linux/vmstat.h> 22#include <linux/vmstat.h>
23#include <linux/syscalls.h>
23 24
24#include "power.h" 25#include "power.h"
25 26
@@ -230,9 +231,14 @@ static int enter_state(suspend_state_t state)
230 231
231 if (!valid_state(state)) 232 if (!valid_state(state))
232 return -ENODEV; 233 return -ENODEV;
234
233 if (!mutex_trylock(&pm_mutex)) 235 if (!mutex_trylock(&pm_mutex))
234 return -EBUSY; 236 return -EBUSY;
235 237
238 printk("Syncing filesystems ... ");
239 sys_sync();
240 printk("done.\n");
241
236 pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); 242 pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
237 if ((error = suspend_prepare())) 243 if ((error = suspend_prepare()))
238 goto Unlock; 244 goto Unlock;
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 3434940a3df1..dba2f3acb4f8 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -191,7 +191,6 @@ int freeze_processes(void)
191 if (error) 191 if (error)
192 return error; 192 return error;
193 193
194 sys_sync();
195 error = try_to_freeze_tasks(FREEZER_KERNEL_THREADS); 194 error = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
196 if (error) 195 if (error)
197 return error; 196 return error;
diff --git a/kernel/power/user.c b/kernel/power/user.c
index bd0723a7df3f..5bd321bcbb75 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -153,6 +153,10 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
153 mutex_lock(&pm_mutex); 153 mutex_lock(&pm_mutex);
154 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); 154 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
155 if (!error) { 155 if (!error) {
156 printk("Syncing filesystems ... ");
157 sys_sync();
158 printk("done.\n");
159
156 error = freeze_processes(); 160 error = freeze_processes();
157 if (error) 161 if (error)
158 thaw_processes(); 162 thaw_processes();