#include <linux/kernel.h>
#include <linux/backing-dev.h>
+#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/swap.h>
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/pagevec.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/buffer_head.h> /* grr. try_to_release_page,
do_invalidatepage */
+#include <linux/cleancache.h>
#include "internal.h"
static inline void truncate_partial_page(struct page *page, unsigned partial)
{
zero_user_segment(page, partial, PAGE_CACHE_SIZE);
+ cleancache_invalidate_page(page->mapping, page);
if (page_has_private(page))
do_invalidatepage(page, partial);
}
* its lock, b) when a concurrent invalidate_mapping_pages got there first and
* c) when tmpfs swizzles a page between a tmpfs inode and swapper_space.
*/
-static void
+static int
truncate_complete_page(struct address_space *mapping, struct page *page)
{
if (page->mapping != mapping)
- return;
+ return -EIO;
if (page_has_private(page))
do_invalidatepage(page, 0);
cancel_dirty_page(page, PAGE_CACHE_SIZE);
- clear_page_mlock(page);
- remove_from_page_cache(page);
ClearPageMappedToDisk(page);
- page_cache_release(page); /* pagecache ref */
+ delete_from_page_cache(page);
+ return 0;
}
/*
if (page_has_private(page) && !try_to_release_page(page, 0))
return 0;
- clear_page_mlock(page);
ret = remove_mapping(mapping, page);
return ret;
}
+int truncate_inode_page(struct address_space *mapping, struct page *page)
+{
+ if (page_mapped(page)) {
+ unmap_mapping_range(mapping,
+ (loff_t)page->index << PAGE_CACHE_SHIFT,
+ PAGE_CACHE_SIZE, 0);
+ }
+ return truncate_complete_page(mapping, page);
+}
+
+/*
+ * Used to get rid of pages on hardware memory corruption.
+ */
+int generic_error_remove_page(struct address_space *mapping, struct page *page)
+{
+ if (!mapping)
+ return -EINVAL;
+ /*
+ * Only punch for normal data pages for now.
+ * Handling other types like directories would need more auditing.
+ */
+ if (!S_ISREG(mapping->host->i_mode))
+ return -EIO;
+ return truncate_inode_page(mapping, page);
+}
+EXPORT_SYMBOL(generic_error_remove_page);
+
+/*
+ * Safely invalidate one page from its pagecache mapping.
+ * It only drops clean, unused pages. The page must be locked.
+ *
+ * Returns 1 if the page is successfully invalidated, otherwise 0.
+ */
+int invalidate_inode_page(struct page *page)
+{
+ struct address_space *mapping = page_mapping(page);
+ if (!mapping)
+ return 0;
+ if (PageDirty(page) || PageWriteback(page))
+ return 0;
+ if (page_mapped(page))
+ return 0;
+ return invalidate_complete_page(mapping, page);
+}
+
/**
- * truncate_inode_pages - truncate range of pages specified by start & end byte offsets
+ * truncate_inode_pages_range - truncate range of pages specified by start & end byte offsets
* @mapping: mapping to truncate
* @lstart: offset from which to truncate
* @lend: offset to which to truncate
* The first pass will remove most pages, so the search cost of the second pass
* is low.
*
- * When looking at page->index outside the page lock we need to be careful to
- * copy it into a local to avoid races (it could change at any time).
- *
* We pass down the cache-hot hint to the page freeing code. Even if the
* mapping is large, it is probably the case that the final pages are the most
* recently touched, and freeing happens in ascending file offset order.
loff_t lstart, loff_t lend)
{
const pgoff_t start = (lstart + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
- pgoff_t end;
const unsigned partial = lstart & (PAGE_CACHE_SIZE - 1);
struct pagevec pvec;
- pgoff_t next;
+ pgoff_t index;
+ pgoff_t end;
int i;
+ cleancache_invalidate_inode(mapping);
if (mapping->nrpages == 0)
return;
end = (lend >> PAGE_CACHE_SHIFT);
pagevec_init(&pvec, 0);
- next = start;
- while (next <= end &&
- pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
+ index = start;
+ while (index <= end && pagevec_lookup(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+ mem_cgroup_uncharge_start();
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
- pgoff_t page_index = page->index;
- if (page_index > end) {
- next = page_index;
+ /* We rely upon deletion not changing page->index */
+ index = page->index;
+ if (index > end)
break;
- }
- if (page_index > next)
- next = page_index;
- next++;
if (!trylock_page(page))
continue;
+ WARN_ON(page->index != index);
if (PageWriteback(page)) {
unlock_page(page);
continue;
}
- if (page_mapped(page)) {
- unmap_mapping_range(mapping,
- (loff_t)page_index<<PAGE_CACHE_SHIFT,
- PAGE_CACHE_SIZE, 0);
- }
- truncate_complete_page(mapping, page);
+ truncate_inode_page(mapping, page);
unlock_page(page);
}
pagevec_release(&pvec);
+ mem_cgroup_uncharge_end();
cond_resched();
+ index++;
}
if (partial) {
}
}
- next = start;
+ index = start;
for ( ; ; ) {
cond_resched();
- if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
- if (next == start)
+ if (!pagevec_lookup(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+ if (index == start)
break;
- next = start;
+ index = start;
continue;
}
- if (pvec.pages[0]->index > end) {
+ if (index == start && pvec.pages[0]->index > end) {
pagevec_release(&pvec);
break;
}
+ mem_cgroup_uncharge_start();
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
- if (page->index > end)
+ /* We rely upon deletion not changing page->index */
+ index = page->index;
+ if (index > end)
break;
+
lock_page(page);
+ WARN_ON(page->index != index);
wait_on_page_writeback(page);
- if (page_mapped(page)) {
- unmap_mapping_range(mapping,
- (loff_t)page->index<<PAGE_CACHE_SHIFT,
- PAGE_CACHE_SIZE, 0);
- }
- if (page->index > next)
- next = page->index;
- next++;
- truncate_complete_page(mapping, page);
+ truncate_inode_page(mapping, page);
unlock_page(page);
}
pagevec_release(&pvec);
+ mem_cgroup_uncharge_end();
+ index++;
}
+ cleancache_invalidate_inode(mapping);
}
EXPORT_SYMBOL(truncate_inode_pages_range);
* @lstart: offset from which to truncate
*
* Called under (and serialised by) inode->i_mutex.
+ *
+ * Note: When this function returns, there can be a page in the process of
+ * deletion (inside __delete_from_page_cache()) in the specified range. Thus
+ * mapping->nrpages can be non-zero when this function returns even after
+ * truncation of the whole mapping.
*/
void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
{
}
EXPORT_SYMBOL(truncate_inode_pages);
-unsigned long __invalidate_mapping_pages(struct address_space *mapping,
- pgoff_t start, pgoff_t end, bool be_atomic)
-{
- struct pagevec pvec;
- pgoff_t next = start;
- unsigned long ret = 0;
- int i;
-
- pagevec_init(&pvec, 0);
- while (next <= end &&
- pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
- for (i = 0; i < pagevec_count(&pvec); i++) {
- struct page *page = pvec.pages[i];
- pgoff_t index;
- int lock_failed;
-
- lock_failed = !trylock_page(page);
-
- /*
- * We really shouldn't be looking at the ->index of an
- * unlocked page. But we're not allowed to lock these
- * pages. So we rely upon nobody altering the ->index
- * of this (pinned-by-us) page.
- */
- index = page->index;
- if (index > next)
- next = index;
- next++;
- if (lock_failed)
- continue;
-
- if (PageDirty(page) || PageWriteback(page))
- goto unlock;
- if (page_mapped(page))
- goto unlock;
- ret += invalidate_complete_page(mapping, page);
-unlock:
- unlock_page(page);
- if (next > end)
- break;
- }
- pagevec_release(&pvec);
- if (likely(!be_atomic))
- cond_resched();
- }
- return ret;
-}
-
/**
* invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
* @mapping: the address_space which holds the pages to invalidate
* pagetables.
*/
unsigned long invalidate_mapping_pages(struct address_space *mapping,
- pgoff_t start, pgoff_t end)
+ pgoff_t start, pgoff_t end)
{
- return __invalidate_mapping_pages(mapping, start, end, false);
+ struct pagevec pvec;
+ pgoff_t index = start;
+ unsigned long ret;
+ unsigned long count = 0;
+ int i;
+
+ /*
+ * Note: this function may get called on a shmem/tmpfs mapping:
+ * pagevec_lookup() might then return 0 prematurely (because it
+ * got a gangful of swap entries); but it's hardly worth worrying
+ * about - it can rarely have anything to free from such a mapping
+ * (most pages are dirty), and already skips over any difficulties.
+ */
+
+ pagevec_init(&pvec, 0);
+ while (index <= end && pagevec_lookup(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+ mem_cgroup_uncharge_start();
+ for (i = 0; i < pagevec_count(&pvec); i++) {
+ struct page *page = pvec.pages[i];
+
+ /* We rely upon deletion not changing page->index */
+ index = page->index;
+ if (index > end)
+ break;
+
+ if (!trylock_page(page))
+ continue;
+ WARN_ON(page->index != index);
+ ret = invalidate_inode_page(page);
+ unlock_page(page);
+ /*
+ * Invalidation is a hint that the page is no longer
+ * of interest and try to speed up its reclaim.
+ */
+ if (!ret)
+ deactivate_page(page);
+ count += ret;
+ }
+ pagevec_release(&pvec);
+ mem_cgroup_uncharge_end();
+ cond_resched();
+ index++;
+ }
+ return count;
}
EXPORT_SYMBOL(invalidate_mapping_pages);
if (PageDirty(page))
goto failed;
- clear_page_mlock(page);
BUG_ON(page_has_private(page));
- __remove_from_page_cache(page);
+ __delete_from_page_cache(page);
spin_unlock_irq(&mapping->tree_lock);
+ mem_cgroup_uncharge_cache_page(page);
+
+ if (mapping->a_ops->freepage)
+ mapping->a_ops->freepage(page);
+
page_cache_release(page); /* pagecache ref */
return 1;
failed:
pgoff_t start, pgoff_t end)
{
struct pagevec pvec;
- pgoff_t next;
+ pgoff_t index;
int i;
int ret = 0;
int ret2 = 0;
int did_range_unmap = 0;
- int wrapped = 0;
+ cleancache_invalidate_inode(mapping);
pagevec_init(&pvec, 0);
- next = start;
- while (next <= end && !wrapped &&
- pagevec_lookup(&pvec, mapping, next,
- min(end - next, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+ index = start;
+ while (index <= end && pagevec_lookup(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+ mem_cgroup_uncharge_start();
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
- pgoff_t page_index;
+
+ /* We rely upon deletion not changing page->index */
+ index = page->index;
+ if (index > end)
+ break;
lock_page(page);
+ WARN_ON(page->index != index);
if (page->mapping != mapping) {
unlock_page(page);
continue;
}
- page_index = page->index;
- next = page_index + 1;
- if (next == 0)
- wrapped = 1;
- if (page_index > end) {
- unlock_page(page);
- break;
- }
wait_on_page_writeback(page);
if (page_mapped(page)) {
if (!did_range_unmap) {
* Zap the rest of the file in one hit.
*/
unmap_mapping_range(mapping,
- (loff_t)page_index<<PAGE_CACHE_SHIFT,
- (loff_t)(end - page_index + 1)
- << PAGE_CACHE_SHIFT,
+ (loff_t)index << PAGE_CACHE_SHIFT,
+ (loff_t)(1 + end - index)
+ << PAGE_CACHE_SHIFT,
0);
did_range_unmap = 1;
} else {
* Just zap this page
*/
unmap_mapping_range(mapping,
- (loff_t)page_index<<PAGE_CACHE_SHIFT,
- PAGE_CACHE_SIZE, 0);
+ (loff_t)index << PAGE_CACHE_SHIFT,
+ PAGE_CACHE_SIZE, 0);
}
}
BUG_ON(page_mapped(page));
unlock_page(page);
}
pagevec_release(&pvec);
+ mem_cgroup_uncharge_end();
cond_resched();
+ index++;
}
+ cleancache_invalidate_inode(mapping);
return ret;
}
EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);
* Any pages which are found to be mapped into pagetables are unmapped prior to
* invalidation.
*
- * Returns -EIO if any pages could not be invalidated.
+ * Returns -EBUSY if any pages could not be invalidated.
*/
int invalidate_inode_pages2(struct address_space *mapping)
{
return invalidate_inode_pages2_range(mapping, 0, -1);
}
EXPORT_SYMBOL_GPL(invalidate_inode_pages2);
+
+/**
+ * truncate_pagecache - unmap and remove pagecache that has been truncated
+ * @inode: inode
+ * @oldsize: old file size
+ * @newsize: new file size
+ *
+ * inode's new i_size must already be written before truncate_pagecache
+ * is called.
+ *
+ * This function should typically be called before the filesystem
+ * releases resources associated with the freed range (eg. deallocates
+ * blocks). This way, pagecache will always stay logically coherent
+ * with on-disk format, and the filesystem would not have to deal with
+ * situations such as writepage being called for a page that has already
+ * had its underlying blocks deallocated.
+ */
+void truncate_pagecache(struct inode *inode, loff_t oldsize, loff_t newsize)
+{
+ struct address_space *mapping = inode->i_mapping;
+ loff_t holebegin = round_up(newsize, PAGE_SIZE);
+
+ /*
+ * unmap_mapping_range is called twice, first simply for
+ * efficiency so that truncate_inode_pages does fewer
+ * single-page unmaps. However after this first call, and
+ * before truncate_inode_pages finishes, it is possible for
+ * private pages to be COWed, which remain after
+ * truncate_inode_pages finishes, hence the second
+ * unmap_mapping_range call must be made for correctness.
+ */
+ unmap_mapping_range(mapping, holebegin, 0, 1);
+ truncate_inode_pages(mapping, newsize);
+ unmap_mapping_range(mapping, holebegin, 0, 1);
+}
+EXPORT_SYMBOL(truncate_pagecache);
+
+/**
+ * truncate_setsize - update inode and pagecache for a new file size
+ * @inode: inode
+ * @newsize: new file size
+ *
+ * truncate_setsize updates i_size and performs pagecache truncation (if
+ * necessary) to @newsize. It will be typically be called from the filesystem's
+ * setattr function when ATTR_SIZE is passed in.
+ *
+ * Must be called with inode_mutex held and before all filesystem specific
+ * block truncation has been performed.
+ */
+void truncate_setsize(struct inode *inode, loff_t newsize)
+{
+ loff_t oldsize;
+
+ oldsize = inode->i_size;
+ i_size_write(inode, newsize);
+
+ truncate_pagecache(inode, oldsize, newsize);
+}
+EXPORT_SYMBOL(truncate_setsize);
+
+/**
+ * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
+ * @inode: inode
+ * @lstart: offset of beginning of hole
+ * @lend: offset of last byte of hole
+ *
+ * This function should typically be called before the filesystem
+ * releases resources associated with the freed range (eg. deallocates
+ * blocks). This way, pagecache will always stay logically coherent
+ * with on-disk format, and the filesystem would not have to deal with
+ * situations such as writepage being called for a page that has already
+ * had its underlying blocks deallocated.
+ */
+void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend)
+{
+ struct address_space *mapping = inode->i_mapping;
+ loff_t unmap_start = round_up(lstart, PAGE_SIZE);
+ loff_t unmap_end = round_down(1 + lend, PAGE_SIZE) - 1;
+ /*
+ * This rounding is currently just for example: unmap_mapping_range
+ * expands its hole outwards, whereas we want it to contract the hole
+ * inwards. However, existing callers of truncate_pagecache_range are
+ * doing their own page rounding first; and truncate_inode_pages_range
+ * currently BUGs if lend is not pagealigned-1 (it handles partial
+ * page at start of hole, but not partial page at end of hole). Note
+ * unmap_mapping_range allows holelen 0 for all, and we allow lend -1.
+ */
+
+ /*
+ * Unlike in truncate_pagecache, unmap_mapping_range is called only
+ * once (before truncating pagecache), and without "even_cows" flag:
+ * hole-punching should not remove private COWed pages from the hole.
+ */
+ if ((u64)unmap_end > (u64)unmap_start)
+ unmap_mapping_range(mapping, unmap_start,
+ 1 + unmap_end - unmap_start, 0);
+ truncate_inode_pages_range(mapping, lstart, lend);
+}
+EXPORT_SYMBOL(truncate_pagecache_range);
Code Review / linux-3.10.git / blobdiff