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Commit 43d871f0 authored by Chris Mason's avatar Chris Mason
Browse files

Merge branch 'integration-4.5' of... 

Merge branch 'integration-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux into for-linus-4.5
parents e410e34f 0c0fe3b0

fs/btrfs/backref.c

+6 −4
Original line number Diff line number Diff line
@@ -1406,6 +1406,7 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path, 
			read_extent_buffer(eb, dest + bytes_left,

					   name_off, name_len);

		if (eb != eb_in) {

			if (!path->skip_locking)

				btrfs_tree_read_unlock_blocking(eb);

			free_extent_buffer(eb);

		}
@@ -1426,9 +1427,10 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path, 
		eb = path->nodes[0];

		/* make sure we can use eb after releasing the path */

		if (eb != eb_in) {

			atomic_inc(&eb->refs);

			btrfs_tree_read_lock(eb);

			if (!path->skip_locking)

				btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);

			path->nodes[0] = NULL;

			path->locks[0] = 0;

		}

		btrfs_release_path(path);

		iref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref);

fs/btrfs/compression.c

+1 −5
Original line number Diff line number Diff line
@@ -637,10 +637,6 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, 
	faili = nr_pages - 1;

	cb->nr_pages = nr_pages;



	/* In the parent-locked case, we only locked the range we are

	 * interested in.  In all other cases, we can opportunistically

	 * cache decompressed data that goes beyond the requested range. */

	if (!(bio_flags & EXTENT_BIO_PARENT_LOCKED))

	add_ra_bio_pages(inode, em_start + em_len, cb);



	/* include any pages we added in add_ra-bio_pages */

fs/btrfs/extent_io.c

+11 −34
Original line number Diff line number Diff line
@@ -2897,12 +2897,11 @@ static int __do_readpage(struct extent_io_tree *tree, 
	struct block_device *bdev;

	int ret;

	int nr = 0;

	int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED;

	size_t pg_offset = 0;

	size_t iosize;

	size_t disk_io_size;

	size_t blocksize = inode->i_sb->s_blocksize;

	unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED;

	unsigned long this_bio_flag = 0;



	set_page_extent_mapped(page);
@@ -2942,7 +2941,6 @@ static int __do_readpage(struct extent_io_tree *tree, 
			kunmap_atomic(userpage);

			set_extent_uptodate(tree, cur, cur + iosize - 1,

					    &cached, GFP_NOFS);

			if (!parent_locked)

			unlock_extent_cached(tree, cur,

					     cur + iosize - 1,

					     &cached, GFP_NOFS);
@@ -2952,7 +2950,6 @@ static int __do_readpage(struct extent_io_tree *tree, 
				      end - cur + 1, get_extent, em_cached);

		if (IS_ERR_OR_NULL(em)) {

			SetPageError(page);

			if (!parent_locked)

			unlock_extent(tree, cur, end);

			break;

		}
@@ -3038,9 +3035,6 @@ static int __do_readpage(struct extent_io_tree *tree, 


			set_extent_uptodate(tree, cur, cur + iosize - 1,

					    &cached, GFP_NOFS);

			if (parent_locked)

				free_extent_state(cached);

			else

			unlock_extent_cached(tree, cur,

					     cur + iosize - 1,

					     &cached, GFP_NOFS);
@@ -3052,7 +3046,6 @@ static int __do_readpage(struct extent_io_tree *tree, 
		if (test_range_bit(tree, cur, cur_end,

				   EXTENT_UPTODATE, 1, NULL)) {

			check_page_uptodate(tree, page);

			if (!parent_locked)

			unlock_extent(tree, cur, cur + iosize - 1);

			cur = cur + iosize;

			pg_offset += iosize;
@@ -3063,7 +3056,6 @@ static int __do_readpage(struct extent_io_tree *tree, 
		 */

		if (block_start == EXTENT_MAP_INLINE) {

			SetPageError(page);

			if (!parent_locked)

			unlock_extent(tree, cur, cur + iosize - 1);

			cur = cur + iosize;

			pg_offset += iosize;
@@ -3083,7 +3075,6 @@ static int __do_readpage(struct extent_io_tree *tree, 
			*bio_flags = this_bio_flag;

		} else {

			SetPageError(page);

			if (!parent_locked)

			unlock_extent(tree, cur, cur + iosize - 1);

		}

		cur = cur + iosize;
@@ -3213,20 +3204,6 @@ int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 
	return ret;

}



int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,

				 get_extent_t *get_extent, int mirror_num)

{

	struct bio *bio = NULL;

	unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED;

	int ret;



	ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num,

			    &bio_flags, READ, NULL);

	if (bio)

		ret = submit_one_bio(READ, bio, mirror_num, bio_flags);

	return ret;

}



static noinline void update_nr_written(struct page *page,

				      struct writeback_control *wbc,

				      unsigned long nr_written)

fs/btrfs/extent_io.h

+0 −3
Original line number Diff line number Diff line
@@ -29,7 +29,6 @@ 
 */

#define EXTENT_BIO_COMPRESSED 1

#define EXTENT_BIO_TREE_LOG 2

#define EXTENT_BIO_PARENT_LOCKED 4

#define EXTENT_BIO_FLAG_SHIFT 16



/* these are bit numbers for test/set bit */
@@ -210,8 +209,6 @@ static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) 
int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);

int extent_read_full_page(struct extent_io_tree *tree, struct page *page,

			  get_extent_t *get_extent, int mirror_num);

int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,

				 get_extent_t *get_extent, int mirror_num);

int __init extent_io_init(void);

void extent_io_exit(void);

fs/btrfs/ioctl.c

+97 −22
Original line number Diff line number Diff line
@@ -2794,24 +2794,29 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) 
static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)

{

	struct page *page;

	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;



	page = grab_cache_page(inode->i_mapping, index);

	if (!page)

		return NULL;

		return ERR_PTR(-ENOMEM);



	if (!PageUptodate(page)) {

		if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,

						 0))

			return NULL;

		int ret;



		ret = btrfs_readpage(NULL, page);

		if (ret)

			return ERR_PTR(ret);

		lock_page(page);

		if (!PageUptodate(page)) {

			unlock_page(page);

			page_cache_release(page);

			return NULL;

		}

			return ERR_PTR(-EIO);

		}

		if (page->mapping != inode->i_mapping) {

			unlock_page(page);

			page_cache_release(page);

			return ERR_PTR(-EAGAIN);

		}

	}



	return page;

}
@@ -2823,17 +2828,31 @@ static int gather_extent_pages(struct inode *inode, struct page **pages, 
	pgoff_t index = off >> PAGE_CACHE_SHIFT;



	for (i = 0; i < num_pages; i++) {

again:

		pages[i] = extent_same_get_page(inode, index + i);

		if (!pages[i])

			return -ENOMEM;

		if (IS_ERR(pages[i])) {

			int err = PTR_ERR(pages[i]);



			if (err == -EAGAIN)

				goto again;

			pages[i] = NULL;

			return err;

		}

	}

	return 0;

}



static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)

static int lock_extent_range(struct inode *inode, u64 off, u64 len,

			     bool retry_range_locking)

{

	/* do any pending delalloc/csum calc on src, one way or

	   another, and lock file content */

	/*

	 * Do any pending delalloc/csum calculations on inode, one way or

	 * another, and lock file content.

	 * The locking order is:

	 *

	 *   1) pages

	 *   2) range in the inode's io tree

	 */

	while (1) {

		struct btrfs_ordered_extent *ordered;

		lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
@@ -2851,8 +2870,11 @@ static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) 
		unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);

		if (ordered)

			btrfs_put_ordered_extent(ordered);

		if (!retry_range_locking)

			return -EAGAIN;

		btrfs_wait_ordered_range(inode, off, len);

	}

	return 0;

}



static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
@@ -2877,15 +2899,24 @@ static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, 
	unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);

}



static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,

				     struct inode *inode2, u64 loff2, u64 len)

static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,

				    struct inode *inode2, u64 loff2, u64 len,

				    bool retry_range_locking)

{

	int ret;



	if (inode1 < inode2) {

		swap(inode1, inode2);

		swap(loff1, loff2);

	}

	lock_extent_range(inode1, loff1, len);

	lock_extent_range(inode2, loff2, len);

	ret = lock_extent_range(inode1, loff1, len, retry_range_locking);

	if (ret)

		return ret;

	ret = lock_extent_range(inode2, loff2, len, retry_range_locking);

	if (ret)

		unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,

			      loff1 + len - 1);

	return ret;

}



struct cmp_pages {
@@ -2901,12 +2932,16 @@ static void btrfs_cmp_data_free(struct cmp_pages *cmp) 


	for (i = 0; i < cmp->num_pages; i++) {

		pg = cmp->src_pages[i];

		if (pg)

		if (pg) {

			unlock_page(pg);

			page_cache_release(pg);

		}

		pg = cmp->dst_pages[i];

		if (pg)

		if (pg) {

			unlock_page(pg);

			page_cache_release(pg);

		}

	}

	kfree(cmp->src_pages);

	kfree(cmp->dst_pages);

}
@@ -2966,6 +3001,8 @@ static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, 


		src_page = cmp->src_pages[i];

		dst_page = cmp->dst_pages[i];

		ASSERT(PageLocked(src_page));

		ASSERT(PageLocked(dst_page));



		addr = kmap_atomic(src_page);

		dst_addr = kmap_atomic(dst_page);
@@ -3078,14 +3115,46 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, 
		goto out_unlock;

	}



again:

	ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp);

	if (ret)

		goto out_unlock;



	if (same_inode)

		lock_extent_range(src, same_lock_start, same_lock_len);

		ret = lock_extent_range(src, same_lock_start, same_lock_len,

					false);

	else

		btrfs_double_extent_lock(src, loff, dst, dst_loff, len);

		ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,

					       false);

	/*

	 * If one of the inodes has dirty pages in the respective range or

	 * ordered extents, we need to flush dellaloc and wait for all ordered

	 * extents in the range. We must unlock the pages and the ranges in the

	 * io trees to avoid deadlocks when flushing delalloc (requires locking

	 * pages) and when waiting for ordered extents to complete (they require

	 * range locking).

	 */

	if (ret == -EAGAIN) {

		/*

		 * Ranges in the io trees already unlocked. Now unlock all

		 * pages before waiting for all IO to complete.

		 */

		btrfs_cmp_data_free(&cmp);

		if (same_inode) {

			btrfs_wait_ordered_range(src, same_lock_start,

						 same_lock_len);

		} else {

			btrfs_wait_ordered_range(src, loff, len);

			btrfs_wait_ordered_range(dst, dst_loff, len);

		}

		goto again;

	}

	ASSERT(ret == 0);

	if (WARN_ON(ret)) {

		/* ranges in the io trees already unlocked */

		btrfs_cmp_data_free(&cmp);

		return ret;

	}



	/* pass original length for comparison so we stay within i_size */

	ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp);
@@ -3907,9 +3976,15 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 
		u64 lock_start = min_t(u64, off, destoff);

		u64 lock_len = max_t(u64, off, destoff) + len - lock_start;



		lock_extent_range(src, lock_start, lock_len);

		ret = lock_extent_range(src, lock_start, lock_len, true);

	} else {

		btrfs_double_extent_lock(src, off, inode, destoff, len);

		ret = btrfs_double_extent_lock(src, off, inode, destoff, len,

					       true);

	}

	ASSERT(ret == 0);

	if (WARN_ON(ret)) {

		/* ranges in the io trees already unlocked */

		goto out_unlock;

	}



	ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);