在 2024/8/15 3:59, Matthew Wilcox (Oracle) 写道:
Call read_cache_folio() instead of read_cache_page() to get the folio
containing the page. No attempt is made here to support large folios
as I assume that will never be interesting for jffs2. Includes a switch
from kmap to kmap_local which looks safe.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/jffs2/gc.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
Reviewed-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
diff --git a/fs/jffs2/gc.c b/fs/jffs2/gc.c
index 5c6602f3c189..822949d0eb00 100644
--- a/fs/jffs2/gc.c
+++ b/fs/jffs2/gc.c
@@ -1171,7 +1171,7 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
uint32_t alloclen, offset, orig_end, orig_start;
int ret = 0;
unsigned char *comprbuf = NULL, *writebuf;
- struct page *page;
+ struct folio *folio;
unsigned char *pg_ptr;
memset(&ri, 0, sizeof(ri));
@@ -1317,25 +1317,25 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
BUG_ON(start > orig_start);
}
- /* The rules state that we must obtain the page lock *before* f->sem, so
+ /* The rules state that we must obtain the folio lock *before* f->sem, so
* drop f->sem temporarily. Since we also hold c->alloc_sem, nothing's
* actually going to *change* so we're safe; we only allow reading.
*
* It is important to note that jffs2_write_begin() will ensure that its
- * page is marked Uptodate before allocating space. That means that if we
- * end up here trying to GC the *same* page that jffs2_write_begin() is
- * trying to write out, read_cache_page() will not deadlock. */
+ * folio is marked uptodate before allocating space. That means that if we
+ * end up here trying to GC the *same* folio that jffs2_write_begin() is
+ * trying to write out, read_cache_folio() will not deadlock. */
mutex_unlock(&f->sem);
- page = read_cache_page(inode->i_mapping, start >> PAGE_SHIFT,
+ folio = read_cache_folio(inode->i_mapping, start >> PAGE_SHIFT,
__jffs2_read_folio, NULL);
- if (IS_ERR(page)) {
- pr_warn("read_cache_page() returned error: %ld\n",
- PTR_ERR(page));
+ if (IS_ERR(folio)) {
+ pr_warn("read_cache_folio() returned error: %ld\n",
+ PTR_ERR(folio));
mutex_lock(&f->sem);
- return PTR_ERR(page);
+ return PTR_ERR(folio);
}
- pg_ptr = kmap(page);
+ pg_ptr = kmap_local_folio(folio, 0);
mutex_lock(&f->sem);
offset = start;
@@ -1400,7 +1400,6 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
}
}
- kunmap(page);
- put_page(page);
+ folio_release_kmap(folio, pg_ptr);
return ret;
}
