Re: [PATCH 1/5] squashfs: Use a folio throughout squashfs_read_folio()

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On 1/14/25 21:07, Phillip Lougher wrote:


On 12/16/24 16:26, Matthew Wilcox (Oracle) wrote:
Use modern folio APIs where they exist and convert back to struct
page for the internal functions.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>

Reviewed-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
Tested-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>

Oops, wrong patch-series.


---
  fs/squashfs/file.c | 25 +++++++++----------------
  1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c
index 21aaa96856c1..bc6598c3a48f 100644
--- a/fs/squashfs/file.c
+++ b/fs/squashfs/file.c
@@ -445,21 +445,19 @@ static int squashfs_readpage_sparse(struct page *page, int expected)
  static int squashfs_read_folio(struct file *file, struct folio *folio)
  {
-    struct page *page = &folio->page;
-    struct inode *inode = page->mapping->host;
+    struct inode *inode = folio->mapping->host;
      struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
-    int index = page->index >> (msblk->block_log - PAGE_SHIFT);
+    int index = folio->index >> (msblk->block_log - PAGE_SHIFT);
      int file_end = i_size_read(inode) >> msblk->block_log;
      int expected = index == file_end ?
              (i_size_read(inode) & (msblk->block_size - 1)) :
               msblk->block_size;
      int res = 0;
-    void *pageaddr;
      TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
-                page->index, squashfs_i(inode)->start);
+                folio->index, squashfs_i(inode)->start);
-    if (page->index >= ((i_size_read(inode) + PAGE_SIZE - 1) >>
+    if (folio->index >= ((i_size_read(inode) + PAGE_SIZE - 1) >>
                      PAGE_SHIFT))
          goto out;
@@ -472,23 +470,18 @@ static int squashfs_read_folio(struct file *file, struct folio *folio)
              goto out;
          if (res == 0)
-            res = squashfs_readpage_sparse(page, expected);
+            res = squashfs_readpage_sparse(&folio->page, expected);
          else
-            res = squashfs_readpage_block(page, block, res, expected);
+            res = squashfs_readpage_block(&folio->page, block, res, expected);
      } else
-        res = squashfs_readpage_fragment(page, expected);
+        res = squashfs_readpage_fragment(&folio->page, expected);
      if (!res)
          return 0;
  out:
-    pageaddr = kmap_atomic(page);
-    memset(pageaddr, 0, PAGE_SIZE);
-    kunmap_atomic(pageaddr);
-    flush_dcache_page(page);
-    if (res == 0)
-        SetPageUptodate(page);
-    unlock_page(page);
+    folio_zero_segment(folio, 0, folio_size(folio));
+    folio_end_read(folio, res == 0);
      return res;
  }




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