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btrfs: convert end_compressed_writeback() to use filemap_get_folios()

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Converted function to use folios throughout.  This is in preparation for
the removal of find_get_pages_contig().  Now also supports large folios.

Since we may receive more than nr_pages pages, nr_pages may underflow. 
Since nr_pages > 0 is equivalent to index <= end_index, we replaced it
with this check instead.

Also this function does not care about the pages being contiguous so we
can just use filemap_get_folios() to be more efficient.

Link: https://lkml.kernel.org/r/20220824004023.77310-4-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Acked-by: David Sterba <dsterba@suse.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Chris Mason <clm@fb.com>
Cc: David Sterba <dsterb@suse.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vishal Moola (Oracle) 2022-08-23 17:40:19 -07:00 committed by Andrew Morton
parent 04c6b79ae4
commit a75b81c3f6
1 changed files with 15 additions and 16 deletions
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31
fs/btrfs/compression.c
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@ -8,6 +8,7 @@
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
#include <linux/highmem.h>
#include <linux/kthread.h>
#include <linux/time.h>
@ -222,8 +223,7 @@ static noinline void end_compressed_writeback(struct inode *inode,
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
unsigned long index = cb->start >> PAGE_SHIFT;
unsigned long end_index = (cb->start + cb->len - 1) >> PAGE_SHIFT;
struct page *pages[16];
unsigned long nr_pages = end_index - index + 1;
struct folio_batch fbatch;
const int errno = blk_status_to_errno(cb->status);
int i;
int ret;
@ -231,24 +231,23 @@ static noinline void end_compressed_writeback(struct inode *inode,
if (errno)
mapping_set_error(inode->i_mapping, errno);
while (nr_pages > 0) {
ret = find_get_pages_contig(inode->i_mapping, index,
min_t(unsigned long,
nr_pages, ARRAY_SIZE(pages)), pages);
if (ret == 0) {
nr_pages -= 1;
index += 1;
continue;
}
folio_batch_init(&fbatch);
while (index <= end_index) {
ret = filemap_get_folios(inode->i_mapping, &index, end_index,
&fbatch);
if (ret == 0)
return;
for (i = 0; i < ret; i++) {
struct folio *folio = fbatch.folios[i];
if (errno)
SetPageError(pages[i]);
btrfs_page_clamp_clear_writeback(fs_info, pages[i],
folio_set_error(folio);
btrfs_page_clamp_clear_writeback(fs_info, &folio->page,
cb->start, cb->len);
put_page(pages[i]);
}
nr_pages -= ret;
index += ret;
folio_batch_release(&fbatch);
}
/* the inode may be gone now */
}