nfsd: 4.1 has an rfc number

[safe/jmp/linux-2.6] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 3c78fc3..0b19943 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -58,7 +58,7 @@ static inline long sync_writeback_pages(unsigned long dirtied)
 /* The following parameters are exported via /proc/sys/vm */
 
 /*
- * Start background writeback (via pdflush) at this percentage
+ * Start background writeback (via writeback threads) at this percentage
  */
 int dirty_background_ratio = 10;
 
@@ -158,37 +158,37 @@ static void update_completion_period(void)
 }
 
 int dirty_background_ratio_handler(struct ctl_table *table, int write,
-               struct file *filp, void __user *buffer, size_t *lenp,
+               void __user *buffer, size_t *lenp,
                loff_t *ppos)
 {
        int ret;
 
-       ret = proc_dointvec_minmax(table, write, filp, buffer, lenp, ppos);
+       ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
        if (ret == 0 && write)
                dirty_background_bytes = 0;
        return ret;
 }
 
 int dirty_background_bytes_handler(struct ctl_table *table, int write,
-               struct file *filp, void __user *buffer, size_t *lenp,
+               void __user *buffer, size_t *lenp,
                loff_t *ppos)
 {
        int ret;
 
-       ret = proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos);
+       ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
        if (ret == 0 && write)
                dirty_background_ratio = 0;
        return ret;
 }
 
 int dirty_ratio_handler(struct ctl_table *table, int write,
-               struct file *filp, void __user *buffer, size_t *lenp,
+               void __user *buffer, size_t *lenp,
                loff_t *ppos)
 {
        int old_ratio = vm_dirty_ratio;
        int ret;
 
-       ret = proc_dointvec_minmax(table, write, filp, buffer, lenp, ppos);
+       ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
        if (ret == 0 && write && vm_dirty_ratio != old_ratio) {
                update_completion_period();
                vm_dirty_bytes = 0;
@@ -198,13 +198,13 @@ int dirty_ratio_handler(struct ctl_table *table, int write,
 
 
 int dirty_bytes_handler(struct ctl_table *table, int write,
-               struct file *filp, void __user *buffer, size_t *lenp,
+               void __user *buffer, size_t *lenp,
                loff_t *ppos)
 {
        unsigned long old_bytes = vm_dirty_bytes;
        int ret;
 
-       ret = proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos);
+       ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
        if (ret == 0 && write && vm_dirty_bytes != old_bytes) {
                update_completion_period();
                vm_dirty_ratio = 0;
@@ -477,8 +477,8 @@ get_dirty_limits(unsigned long *pbackground, unsigned long *pdirty,
  * balance_dirty_pages() must be called by processes which are generating dirty
  * data.  It looks at the number of dirty pages in the machine and will force
  * the caller to perform writeback if the system is over `vm_dirty_ratio'.
- * If we're over `background_thresh' then pdflush is woken to perform some
- * writeout.
+ * If we're over `background_thresh' then the writeback threads are woken to
+ * perform some writeout.
  */
 static void balance_dirty_pages(struct address_space *mapping,
                                unsigned long write_chunk)
@@ -566,7 +566,8 @@ static void balance_dirty_pages(struct address_space *mapping,
                if (pages_written >= write_chunk)
                        break;          /* We've done our duty */
 
-               schedule_timeout_interruptible(pause);
+               __set_current_state(TASK_INTERRUPTIBLE);
+               io_schedule_timeout(pause);
 
                /*
                 * Increase the delay for each loop, up to our previous
@@ -582,7 +583,7 @@ static void balance_dirty_pages(struct address_space *mapping,
                bdi->dirty_exceeded = 0;
 
        if (writeback_in_progress(bdi))
-               return;         /* pdflush is already working this queue */
+               return;
 
        /*
         * In laptop mode, we wait until hitting the higher threshold before
@@ -596,7 +597,7 @@ static void balance_dirty_pages(struct address_space *mapping,
            (!laptop_mode && ((global_page_state(NR_FILE_DIRTY)
                               + global_page_state(NR_UNSTABLE_NFS))
                                          > background_thresh)))
-               bdi_start_writeback(bdi, 0);
+               bdi_start_writeback(bdi, NULL, 0);
 }
 
 void set_page_dirty_balance(struct page *page, int page_mkwrite)
@@ -690,9 +691,9 @@ static DEFINE_TIMER(laptop_mode_wb_timer, laptop_timer_fn, 0, 0);
  * sysctl handler for /proc/sys/vm/dirty_writeback_centisecs
  */
 int dirty_writeback_centisecs_handler(ctl_table *table, int write,
-       struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
+       void __user *buffer, size_t *length, loff_t *ppos)
 {
-       proc_dointvec(table, write, file, buffer, length, ppos);
+       proc_dointvec(table, write, buffer, length, ppos);
        return 0;
 }
 
@@ -820,7 +821,6 @@ int write_cache_pages(struct address_space *mapping,
                      struct writeback_control *wbc, writepage_t writepage,
                      void *data)
 {
-       struct backing_dev_info *bdi = mapping->backing_dev_info;
        int ret = 0;
        int done = 0;
        struct pagevec pvec;
@@ -833,11 +833,6 @@ int write_cache_pages(struct address_space *mapping,
        int range_whole = 0;
        long nr_to_write = wbc->nr_to_write;
 
-       if (wbc->nonblocking && bdi_write_congested(bdi)) {
-               wbc->encountered_congestion = 1;
-               return 0;
-       }
-
        pagevec_init(&pvec, 0);
        if (wbc->range_cyclic) {
                writeback_index = mapping->writeback_index; /* prev offset */
@@ -956,12 +951,6 @@ continue_unlock:
                                        break;
                                }
                        }
-
-                       if (wbc->nonblocking && bdi_write_congested(bdi)) {
-                               wbc->encountered_congestion = 1;
-                               done = 1;
-                               break;
-                       }
                }
                pagevec_release(&pvec);
                cond_resched();
@@ -1153,6 +1142,13 @@ int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page)
 EXPORT_SYMBOL(redirty_page_for_writepage);
 
 /*
+ * Dirty a page.
+ *
+ * For pages with a mapping this should be done under the page lock
+ * for the benefit of asynchronous memory errors who prefer a consistent
+ * dirty state. This rule can be broken in some special cases,
+ * but should be better not to.
+ *
  * If the mapping doesn't provide a set_page_dirty a_op, then
  * just fall through and assume that it wants buffer_heads.
  */