diff options
| -rw-r--r-- | drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h | 4 | ||||
| -rw-r--r-- | fs/buffer.c | 4 | ||||
| -rw-r--r-- | fs/hugetlbfs/inode.c | 2 | ||||
| -rw-r--r-- | fs/nfs/write.c | 5 | ||||
| -rw-r--r-- | include/linux/mm.h | 2 | ||||
| -rw-r--r-- | include/linux/page-flags.h | 2 | ||||
| -rw-r--r-- | mm/filemap.c | 15 | ||||
| -rw-r--r-- | mm/page-writeback.c | 19 | ||||
| -rw-r--r-- | mm/truncate.c | 37 |
9 files changed, 41 insertions, 49 deletions
diff --git a/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h b/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h index a260e99a4447..d72605864b0a 100644 --- a/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h +++ b/drivers/staging/lustre/lustre/include/linux/lustre_patchless_compat.h @@ -55,7 +55,9 @@ truncate_complete_page(struct address_space *mapping, struct page *page) if (PagePrivate(page)) page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); - cancel_dirty_page(page, PAGE_SIZE); + if (TestClearPageDirty(page)) + account_page_cleaned(page, mapping); + ClearPageMappedToDisk(page); ll_delete_from_page_cache(page); } diff --git a/fs/buffer.c b/fs/buffer.c index 20805db2c987..c7a5602d01ee 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3243,8 +3243,8 @@ int try_to_free_buffers(struct page *page) * to synchronise against __set_page_dirty_buffers and prevent the * dirty bit from being lost. */ - if (ret) - cancel_dirty_page(page, PAGE_CACHE_SIZE); + if (ret && TestClearPageDirty(page)) + account_page_cleaned(page, mapping); spin_unlock(&mapping->private_lock); out: if (buffers_to_free) { diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index c274aca8e8dc..db76cec3ce21 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -319,7 +319,7 @@ static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, static void truncate_huge_page(struct page *page) { - cancel_dirty_page(page, /* No IO accounting for huge pages? */0); + ClearPageDirty(page); ClearPageUptodate(page); delete_from_page_cache(page); } diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 849ed784d6ac..759931088094 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1876,11 +1876,6 @@ int nfs_wb_page_cancel(struct inode *inode, struct page *page) * request from the inode / page_private pointer and * release it */ nfs_inode_remove_request(req); - /* - * In case nfs_inode_remove_request has marked the - * page as being dirty - */ - cancel_dirty_page(page, PAGE_CACHE_SIZE); nfs_unlock_and_release_request(req); } diff --git a/include/linux/mm.h b/include/linux/mm.h index cccbbba12b9d..6571dd78e984 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1294,9 +1294,11 @@ int __set_page_dirty_no_writeback(struct page *page); int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page); void account_page_dirtied(struct page *page, struct address_space *mapping); +void account_page_cleaned(struct page *page, struct address_space *mapping); int set_page_dirty(struct page *page); int set_page_dirty_lock(struct page *page); int clear_page_dirty_for_io(struct page *page); + int get_cmdline(struct task_struct *task, char *buffer, int buflen); /* Is the vma a continuation of the stack vma above it? */ diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 5ed7bdaf22d5..c851ff92d5b3 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -328,8 +328,6 @@ static inline void SetPageUptodate(struct page *page) CLEARPAGEFLAG(Uptodate, uptodate) -extern void cancel_dirty_page(struct page *page, unsigned int account_size); - int test_clear_page_writeback(struct page *page); int __test_set_page_writeback(struct page *page, bool keep_write); diff --git a/mm/filemap.c b/mm/filemap.c index ad7242043bdb..434dba317400 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -203,16 +203,15 @@ void __delete_from_page_cache(struct page *page, void *shadow) BUG_ON(page_mapped(page)); /* - * Some filesystems seem to re-dirty the page even after - * the VM has canceled the dirty bit (eg ext3 journaling). + * At this point page must be either written or cleaned by truncate. + * Dirty page here signals a bug and loss of unwritten data. * - * Fix it up by doing a final dirty accounting check after - * having removed the page entirely. + * This fixes dirty accounting after removing the page entirely but + * leaves PageDirty set: it has no effect for truncated page and + * anyway will be cleared before returning page into buddy allocator. */ - if (PageDirty(page) && mapping_cap_account_dirty(mapping)) { - dec_zone_page_state(page, NR_FILE_DIRTY); - dec_bdi_stat(inode_to_bdi(mapping->host), BDI_RECLAIMABLE); - } + if (WARN_ON_ONCE(PageDirty(page))) + account_page_cleaned(page, mapping); } /** diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 644bcb665773..0372411f38fc 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2111,6 +2111,25 @@ void account_page_dirtied(struct page *page, struct address_space *mapping) EXPORT_SYMBOL(account_page_dirtied); /* + * Helper function for deaccounting dirty page without writeback. + * + * Doing this should *normally* only ever be done when a page + * is truncated, and is not actually mapped anywhere at all. However, + * fs/buffer.c does this when it notices that somebody has cleaned + * out all the buffers on a page without actually doing it through + * the VM. Can you say "ext3 is horribly ugly"? Thought you could. + */ +void account_page_cleaned(struct page *page, struct address_space *mapping) +{ + if (mapping_cap_account_dirty(mapping)) { + dec_zone_page_state(page, NR_FILE_DIRTY); + dec_bdi_stat(inode_to_bdi(mapping->host), BDI_RECLAIMABLE); + task_io_account_cancelled_write(PAGE_CACHE_SIZE); + } +} +EXPORT_SYMBOL(account_page_cleaned); + +/* * For address_spaces which do not use buffers. Just tag the page as dirty in * its radix tree. * diff --git a/mm/truncate.c b/mm/truncate.c index ddec5a5966d7..7a9d8a3cb143 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -93,35 +93,6 @@ void do_invalidatepage(struct page *page, unsigned int offset, } /* - * This cancels just the dirty bit on the kernel page itself, it - * does NOT actually remove dirty bits on any mmap's that may be - * around. It also leaves the page tagged dirty, so any sync - * activity will still find it on the dirty lists, and in particular, - * clear_page_dirty_for_io() will still look at the dirty bits in - * the VM. - * - * Doing this should *normally* only ever be done when a page - * is truncated, and is not actually mapped anywhere at all. However, - * fs/buffer.c does this when it notices that somebody has cleaned - * out all the buffers on a page without actually doing it through - * the VM. Can you say "ext3 is horribly ugly"? Tought you could. - */ -void cancel_dirty_page(struct page *page, unsigned int account_size) -{ - if (TestClearPageDirty(page)) { - struct address_space *mapping = page->mapping; - if (mapping && mapping_cap_account_dirty(mapping)) { - dec_zone_page_state(page, NR_FILE_DIRTY); - dec_bdi_stat(inode_to_bdi(mapping->host), - BDI_RECLAIMABLE); - if (account_size) - task_io_account_cancelled_write(account_size); - } - } -} -EXPORT_SYMBOL(cancel_dirty_page); - -/* * If truncate cannot remove the fs-private metadata from the page, the page * becomes orphaned. It will be left on the LRU and may even be mapped into * user pagetables if we're racing with filemap_fault(). @@ -140,7 +111,13 @@ truncate_complete_page(struct address_space *mapping, struct page *page) if (page_has_private(page)) do_invalidatepage(page, 0, PAGE_CACHE_SIZE); - cancel_dirty_page(page, PAGE_CACHE_SIZE); + /* + * Some filesystems seem to re-dirty the page even after + * the VM has canceled the dirty bit (eg ext3 journaling). + * Hence dirty accounting check is placed after invalidation. + */ + if (TestClearPageDirty(page)) + account_page_cleaned(page, mapping); ClearPageMappedToDisk(page); delete_from_page_cache(page); |