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ext4: convert mext_page_double_lock() to mext_folio_double_lock()

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Convert mext_page_double_lock() to use folios.  This change saves 146
bytes of kernel text.  It also removes 6 calls to compound_head() and 2
calls to folio_file_page().

Link: https://lkml.kernel.org/r/20221207181009.4016-1-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vishal Moola (Oracle) 2022-12-07 10:10:09 -08:00 • committed by Andrew Morton
parent f4d9139f13
commit e8dfc854ee
1 changed files with 23 additions and 23 deletions
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46
fs/ext4/move_extent.c
View file

@ -110,22 +110,23 @@ out:
}
/**
* 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 @@ again:
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 @@ again:
* 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]);