@@ -1024,40 +1024,43 @@ static sector_t folio_init_buffers(struct folio *folio,
}
/*
- * Create the page-cache page that contains the requested block.
+ * Create the page-cache folio that contains the requested block.
*
* This is used purely for blockdev mappings.
+ *
+ * Returns false if we have a 'permanent' failure. Returns true if
+ * we succeeded, or the caller should retry.
*/
-static int
-grow_dev_page(struct block_device *bdev, sector_t block,
- pgoff_t index, int size, int sizebits, gfp_t gfp)
+static bool grow_dev_folio(struct block_device *bdev, sector_t block,
+ pgoff_t index, unsigned size, int sizebits, gfp_t gfp)
{
struct inode *inode = bdev->bd_inode;
struct folio *folio;
struct buffer_head *bh;
- sector_t end_block;
- int ret = 0;
+ sector_t end_block = 0;
folio = __filemap_get_folio(inode->i_mapping, index,
FGP_LOCK | FGP_ACCESSED | FGP_CREAT, gfp);
if (IS_ERR(folio))
- return PTR_ERR(folio);
+ return false;
bh = folio_buffers(folio);
if (bh) {
if (bh->b_size == size) {
end_block = folio_init_buffers(folio, bdev,
(sector_t)index << sizebits, size);
- goto done;
+ goto unlock;
}
+
+ /* Caller should retry if this call fails */
+ end_block = ~0ULL;
if (!try_to_free_buffers(folio))
- goto failed;
+ goto unlock;
}
- ret = -ENOMEM;
bh = folio_alloc_buffers(folio, size, gfp | __GFP_ACCOUNT);
if (!bh)
- goto failed;
+ goto unlock;
/*
* Link the folio to the buffers and initialise them. Take the
@@ -1069,20 +1072,19 @@ grow_dev_page(struct block_device *bdev, sector_t block,
end_block = folio_init_buffers(folio, bdev,
(sector_t)index << sizebits, size);
spin_unlock(&inode->i_mapping->private_lock);
-done:
- ret = (block < end_block) ? 1 : -ENXIO;
-failed:
+unlock:
folio_unlock(folio);
folio_put(folio);
- return ret;
+ return block < end_block;
}
/*
- * Create buffers for the specified block device block's page. If
- * that page was dirty, the buffers are set dirty also.
+ * Create buffers for the specified block device block's folio. If
+ * that folio was dirty, the buffers are set dirty also. Returns false
+ * if we've hit a permanent error.
*/
-static int
-grow_buffers(struct block_device *bdev, sector_t block, int size, gfp_t gfp)
+static bool grow_buffers(struct block_device *bdev, sector_t block,
+ unsigned size, gfp_t gfp)
{
pgoff_t index;
int sizebits;
@@ -1099,11 +1101,11 @@ grow_buffers(struct block_device *bdev, sector_t block, int size, gfp_t gfp)
"device %pg\n",
__func__, (unsigned long long)block,
bdev);
- return -EIO;
+ return false;
}
- /* Create a page with the proper size buffers.. */
- return grow_dev_page(bdev, block, index, size, sizebits, gfp);
+ /* Create a folio with the proper size buffers */
+ return grow_dev_folio(bdev, block, index, size, sizebits, gfp);
}
static struct buffer_head *
@@ -1124,14 +1126,12 @@ __getblk_slow(struct block_device *bdev, sector_t block,
for (;;) {
struct buffer_head *bh;
- int ret;
bh = __find_get_block(bdev, block, size);
if (bh)
return bh;
- ret = grow_buffers(bdev, block, size, gfp);
- if (ret < 0)
+ if (!grow_buffers(bdev, block, size, gfp))
return NULL;
}
}
Rename grow_dev_page() to grow_dev_folio() and make it return a bool. Document what that bool means; it's more subtle than it first appears. Also rename the 'failed' label to 'unlock' beacuse it's not exactly 'failed'. It just hasn't succeeded. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- fs/buffer.c | 50 +++++++++++++++++++++++++------------------------- 1 file changed, 25 insertions(+), 25 deletions(-)