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Date: Tue, 6 Dec 2022 12:41:15 -0800
From: "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To: linux-mm@...ck.org
Cc: tytso@....edu, linux-ext4@...r.kernel.org,
linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
"Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH mm-unstable] ext4: Convert mext_page_double_lock() to mext_folio_double_lock()
Converts mext_page_double_lock() to use folios. This change saves
146 bytes of kernel text and removes 3 calls to compound_head().
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
fs/ext4/move_extent.c | 46 +++++++++++++++++++++----------------------
1 file changed, 23 insertions(+), 23 deletions(-)
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 8dbb87edf24c..2de9829aed63 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -110,22 +110,23 @@ mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count,
}
/**
- * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2
+ * mext_folio_double_lock - Grab and lock folio on both @inode1 and @inode2
*
* @inode1: the inode structure
* @inode2: the inode structure
- * @index1: page index
- * @index2: page index
- * @page: result page vector
+ * @index1: folio index
+ * @index2: folio index
+ * @folio: result folio vector
*
- * Grab two locked pages for inode's by inode order
+ * Grab two locked folio for inode's by inode order
*/
static int
-mext_page_double_lock(struct inode *inode1, struct inode *inode2,
- pgoff_t index1, pgoff_t index2, struct page *page[2])
+mext_folio_double_lock(struct inode *inode1, struct inode *inode2,
+ pgoff_t index1, pgoff_t index2, struct folio *folio[2])
{
struct address_space *mapping[2];
unsigned int flags;
+ unsigned fgp_flags = FGP_LOCK | FGP_WRITE | FGP_CREAT | FGP_STABLE;
BUG_ON(!inode1 || !inode2);
if (inode1 < inode2) {
@@ -138,28 +139,30 @@ mext_page_double_lock(struct inode *inode1, struct inode *inode2,
}
flags = memalloc_nofs_save();
- page[0] = grab_cache_page_write_begin(mapping[0], index1);
- if (!page[0]) {
+ folio[0] = __filemap_get_folio(mapping[0], index1, fgp_flags,
+ mapping_gfp_mask(mapping[0]));
+ if (!folio[0]) {
memalloc_nofs_restore(flags);
return -ENOMEM;
}
- page[1] = grab_cache_page_write_begin(mapping[1], index2);
+ folio[1] = __filemap_get_folio(mapping[1], index2, fgp_flags,
+ mapping_gfp_mask(mapping[1]));
memalloc_nofs_restore(flags);
- if (!page[1]) {
- unlock_page(page[0]);
- put_page(page[0]);
+ if (!folio[1]) {
+ folio_unlock(folio[0]);
+ folio_put(folio[0]);
return -ENOMEM;
}
/*
- * grab_cache_page_write_begin() may not wait on page's writeback if
+ * __filemap_get_folio() may not wait on folio's writeback if
* BDI not demand that. But it is reasonable to be very conservative
- * here and explicitly wait on page's writeback
+ * here and explicitly wait on folio's writeback
*/
- wait_on_page_writeback(page[0]);
- wait_on_page_writeback(page[1]);
+ folio_wait_writeback(folio[0]);
+ folio_wait_writeback(folio[1]);
if (inode1 > inode2)
- swap(page[0], page[1]);
+ swap(folio[0], folio[1]);
return 0;
}
@@ -252,7 +255,6 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
int block_len_in_page, int unwritten, int *err)
{
struct inode *orig_inode = file_inode(o_filp);
- struct page *pagep[2] = {NULL, NULL};
struct folio *folio[2] = {NULL, NULL};
handle_t *handle;
ext4_lblk_t orig_blk_offset, donor_blk_offset;
@@ -303,8 +305,8 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
replaced_size = data_size;
- *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset,
- donor_page_offset, pagep);
+ *err = mext_folio_double_lock(orig_inode, donor_inode, orig_page_offset,
+ donor_page_offset, folio);
if (unlikely(*err < 0))
goto stop_journal;
/*
@@ -314,8 +316,6 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
* hold page's lock, if it is still the case data copy is not
* necessary, just swap data blocks between orig and donor.
*/
- folio[0] = page_folio(pagep[0]);
- folio[1] = page_folio(pagep[1]);
VM_BUG_ON_FOLIO(folio_test_large(folio[0]), folio[0]);
VM_BUG_ON_FOLIO(folio_test_large(folio[1]), folio[1]);
--
2.38.1
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