When fewer pages are read, nr_pages may be smaller than nr_cpages. Due
to the nr_vecs limit, the compressed pages will be split into multiple
bios and then merged at the block level. In this case, nr_cpages should
be used to pre-allocate bvecs.
To handle this case, align max_nr_pages to cluster_size, which should be
enough for all compressed pages.
Signed-off-by: Jianan Huang <huangjia...@xiaomi.com>
Signed-off-by: Sheng Yong <shengyo...@xiaomi.com>
---
Changes since v3:
- Keep max_nr_pages unchanged across multiple reads.
Changes since v2:
- Initialize index only for compressed files.
Changes since v1:
- Use aligned nr_pages instead of nr_cpages to pre-allocate bvecs.
fs/f2fs/data.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 31e892842625..40292e4ad341 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2303,7 +2303,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct
bio **bio_ret,
}
if (!bio) {
- bio = f2fs_grab_read_bio(inode, blkaddr, nr_pages,
+ bio = f2fs_grab_read_bio(inode, blkaddr, nr_pages - i,
f2fs_ra_op_flags(rac),
folio->index, for_write);
if (IS_ERR(bio)) {
@@ -2376,6 +2376,14 @@ static int f2fs_mpage_readpages(struct inode *inode,
unsigned max_nr_pages = nr_pages;
int ret = 0;
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+ if (f2fs_compressed_file(inode)) {
+ index = rac ? readahead_index(rac) : folio->index;
+ max_nr_pages = round_up(index + nr_pages, cc.cluster_size) -
+ round_down(index, cc.cluster_size);
+ }
+#endif
+
map.m_pblk = 0;
map.m_lblk = 0;
map.m_len = 0;
--
2.43.0
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