From f47960f49e59b9d77bd2919c3513dbbe088c3908 Mon Sep 17 00:00:00 2001
From: Qu Wenruo <wqu@suse.com>
Date: Mon, 26 Jul 2021 14:34:56 +0800
Patch-mainline: v5.15-rc1
References: jsc#SLE-17681
Git-commit: f47960f49e59b9d77bd2919c3513dbbe088c3908
Subject: [PATCH 07/18] btrfs: reloc: factor out relocation page read and dirty
part
In function relocate_file_extent_cluster(), we have a big loop for
marking all involved page delalloc.
That part is long enough to be contained in one function, so this patch
will move that code chunk into a new function, relocate_one_page().
This also provides enough space for later subpage work.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/relocation.c | 198 ++++++++++++++++++++----------------------
1 file changed, 93 insertions(+), 105 deletions(-)
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index fc831597cb22..e28c3b936937 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2886,19 +2886,102 @@ noinline int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info)
}
ALLOW_ERROR_INJECTION(btrfs_should_cancel_balance, TRUE);
-static int relocate_file_extent_cluster(struct inode *inode,
- struct file_extent_cluster *cluster)
+static int relocate_one_page(struct inode *inode, struct file_ra_state *ra,
+ struct file_extent_cluster *cluster,
+ int *cluster_nr, unsigned long page_index)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+ u64 offset = BTRFS_I(inode)->index_cnt;
+ const unsigned long last_index = (cluster->end - offset) >> PAGE_SHIFT;
+ gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
+ struct page *page;
u64 page_start;
u64 page_end;
+ int ret;
+
+ ASSERT(page_index <= last_index);
+ ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), PAGE_SIZE);
+ if (ret)
+ return ret;
+
+ page = find_lock_page(inode->i_mapping, page_index);
+ if (!page) {
+ page_cache_sync_readahead(inode->i_mapping, ra, NULL,
+ page_index, last_index + 1 - page_index);
+ page = find_or_create_page(inode->i_mapping, page_index, mask);
+ if (!page) {
+ ret = -ENOMEM;
+ goto release_delalloc;
+ }
+ }
+ ret = set_page_extent_mapped(page);
+ if (ret < 0)
+ goto release_page;
+
+ if (PageReadahead(page))
+ page_cache_async_readahead(inode->i_mapping, ra, NULL, page,
+ page_index, last_index + 1 - page_index);
+
+ if (!PageUptodate(page)) {
+ btrfs_readpage(NULL, page);
+ lock_page(page);
+ if (!PageUptodate(page)) {
+ ret = -EIO;
+ goto release_page;
+ }
+ }
+
+ page_start = page_offset(page);
+ page_end = page_start + PAGE_SIZE - 1;
+
+ lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end);
+
+ if (*cluster_nr < cluster->nr &&
+ page_start + offset == cluster->boundary[*cluster_nr]) {
+ set_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
+ EXTENT_BOUNDARY);
+ (*cluster_nr)++;
+ }
+
+ ret = btrfs_set_extent_delalloc(BTRFS_I(inode), page_start, page_end,
+ 0, NULL);
+ if (ret) {
+ clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start,
+ page_end, EXTENT_LOCKED | EXTENT_BOUNDARY);
+ goto release_page;
+
+ }
+ set_page_dirty(page);
+
+ unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end);
+ unlock_page(page);
+ put_page(page);
+
+ btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
+ balance_dirty_pages_ratelimited(inode->i_mapping);
+ btrfs_throttle(fs_info);
+ if (btrfs_should_cancel_balance(fs_info))
+ ret = -ECANCELED;
+ return ret;
+
+release_page:
+ unlock_page(page);
+ put_page(page);
+release_delalloc:
+ btrfs_delalloc_release_metadata(BTRFS_I(inode), PAGE_SIZE, true);
+ btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
+ return ret;
+}
+
+static int relocate_file_extent_cluster(struct inode *inode,
+ struct file_extent_cluster *cluster)
+{
+ struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
u64 offset = BTRFS_I(inode)->index_cnt;
unsigned long index;
unsigned long last_index;
- struct page *page;
struct file_ra_state *ra;
- gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
- int nr = 0;
+ int cluster_nr = 0;
int ret = 0;
if (!cluster->nr)
@@ -2919,109 +3002,14 @@ static int relocate_file_extent_cluster(struct inode *inode,
if (ret)
goto out;
- index = (cluster->start - offset) >> PAGE_SHIFT;
last_index = (cluster->end - offset) >> PAGE_SHIFT;
- while (index <= last_index) {
- ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode),
- PAGE_SIZE);
- if (ret)
- goto out;
-
- page = find_lock_page(inode->i_mapping, index);
- if (!page) {
- page_cache_sync_readahead(inode->i_mapping,
- ra, NULL, index,
- last_index + 1 - index);
- page = find_or_create_page(inode->i_mapping, index,
- mask);
- if (!page) {
- btrfs_delalloc_release_metadata(BTRFS_I(inode),
- PAGE_SIZE, true);
- btrfs_delalloc_release_extents(BTRFS_I(inode),
- PAGE_SIZE);
- ret = -ENOMEM;
- goto out;
- }
- }
- ret = set_page_extent_mapped(page);
- if (ret < 0) {
- btrfs_delalloc_release_metadata(BTRFS_I(inode),
- PAGE_SIZE, true);
- btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
- unlock_page(page);
- put_page(page);
- goto out;
- }
-
- if (PageReadahead(page)) {
- page_cache_async_readahead(inode->i_mapping,
- ra, NULL, page, index,
- last_index + 1 - index);
- }
-
- if (!PageUptodate(page)) {
- btrfs_readpage(NULL, page);
- lock_page(page);
- if (!PageUptodate(page)) {
- unlock_page(page);
- put_page(page);
- btrfs_delalloc_release_metadata(BTRFS_I(inode),
- PAGE_SIZE, true);
- btrfs_delalloc_release_extents(BTRFS_I(inode),
- PAGE_SIZE);
- ret = -EIO;
- goto out;
- }
- }
-
- page_start = page_offset(page);
- page_end = page_start + PAGE_SIZE - 1;
-
- lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end);
-
- if (nr < cluster->nr &&
- page_start + offset == cluster->boundary[nr]) {
- set_extent_bits(&BTRFS_I(inode)->io_tree,
- page_start, page_end,
- EXTENT_BOUNDARY);
- nr++;
- }
-
- ret = btrfs_set_extent_delalloc(BTRFS_I(inode), page_start,
- page_end, 0, NULL);
- if (ret) {
- unlock_page(page);
- put_page(page);
- btrfs_delalloc_release_metadata(BTRFS_I(inode),
- PAGE_SIZE, true);
- btrfs_delalloc_release_extents(BTRFS_I(inode),
- PAGE_SIZE);
-
- clear_extent_bits(&BTRFS_I(inode)->io_tree,
- page_start, page_end,
- EXTENT_LOCKED | EXTENT_BOUNDARY);
- goto out;
-
- }
- set_page_dirty(page);
-
- unlock_extent(&BTRFS_I(inode)->io_tree,
- page_start, page_end);
- unlock_page(page);
- put_page(page);
-
- index++;
- btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
- balance_dirty_pages_ratelimited(inode->i_mapping);
- btrfs_throttle(fs_info);
- if (btrfs_should_cancel_balance(fs_info)) {
- ret = -ECANCELED;
- goto out;
- }
- }
- WARN_ON(nr != cluster->nr);
+ for (index = (cluster->start - offset) >> PAGE_SHIFT;
+ index <= last_index && !ret; index++)
+ ret = relocate_one_page(inode, ra, cluster, &cluster_nr, index);
if (btrfs_is_zoned(fs_info) && !ret)
ret = btrfs_wait_ordered_range(inode, 0, (u64)-1);
+ if (ret == 0)
+ WARN_ON(cluster_nr != cluster->nr);
out:
kfree(ra);
return ret;
--
2.33.0