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From: Matthew W. (Oracle) <wi...@in...> - 2023-10-16 20:11:43
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Convert each element of the pages array to a folio before using it.
This in no way renders the function large-folio safe, but it does remove
a lot of hidden calls to compound_head().
Signed-off-by: Matthew Wilcox (Oracle) <wi...@in...>
---
fs/ntfs/file.c | 89 +++++++++++++++++++++++---------------------------
1 file changed, 41 insertions(+), 48 deletions(-)
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index cbc545999cfe..099141d20db6 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -567,7 +567,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
LCN lcn;
s64 bh_pos, vcn_len, end, initialized_size;
sector_t lcn_block;
- struct page *page;
+ struct folio *folio;
struct inode *vi;
ntfs_inode *ni, *base_ni = NULL;
ntfs_volume *vol;
@@ -601,20 +601,6 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
(long long)pos, bytes);
blocksize = vol->sb->s_blocksize;
blocksize_bits = vol->sb->s_blocksize_bits;
- u = 0;
- do {
- page = pages[u];
- BUG_ON(!page);
- /*
- * create_empty_buffers() will create uptodate/dirty buffers if
- * the page is uptodate/dirty.
- */
- if (!page_has_buffers(page)) {
- create_empty_buffers(page, blocksize, 0);
- if (unlikely(!page_has_buffers(page)))
- return -ENOMEM;
- }
- } while (++u < nr_pages);
rl_write_locked = false;
rl = NULL;
err = 0;
@@ -626,14 +612,21 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
end = pos + bytes;
cend = (end + vol->cluster_size - 1) >> vol->cluster_size_bits;
/*
- * Loop over each page and for each page over each buffer. Use goto to
+ * Loop over each buffer in each folio. Use goto to
* reduce indentation.
*/
u = 0;
-do_next_page:
- page = pages[u];
- bh_pos = (s64)page->index << PAGE_SHIFT;
- bh = head = page_buffers(page);
+do_next_folio:
+ folio = page_folio(pages[u]);
+ bh_pos = folio_pos(folio);
+ head = folio_buffers(folio);
+ if (!head)
+ /*
+ * create_empty_buffers() will create uptodate/dirty
+ * buffers if the folio is uptodate/dirty.
+ */
+ head = folio_create_empty_buffers(folio, blocksize, 0);
+ bh = head;
do {
VCN cdelta;
s64 bh_end;
@@ -653,15 +646,15 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
if (buffer_uptodate(bh))
continue;
/*
- * The buffer is not uptodate. If the page is uptodate
+ * The buffer is not uptodate. If the folio is uptodate
* set the buffer uptodate and otherwise ignore it.
*/
- if (PageUptodate(page)) {
+ if (folio_test_uptodate(folio)) {
set_buffer_uptodate(bh);
continue;
}
/*
- * Neither the page nor the buffer are uptodate. If
+ * Neither the folio nor the buffer are uptodate. If
* the buffer is only partially being written to, we
* need to read it in before the write, i.e. now.
*/
@@ -679,7 +672,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
- zero_user(page, bh_offset(bh),
+ folio_zero_range(folio, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
@@ -706,7 +699,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
(bh_cofs >> blocksize_bits);
set_buffer_mapped(bh);
/*
- * If the page is uptodate so is the buffer. If the
+ * If the folio is uptodate so is the buffer. If the
* buffer is fully outside the write, we ignore it if
* it was already allocated and we mark it dirty so it
* gets written out if we allocated it. On the other
@@ -714,7 +707,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
* marking it dirty we set buffer_new so we can do
* error recovery.
*/
- if (PageUptodate(page)) {
+ if (folio_test_uptodate(folio)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
if (unlikely(was_hole)) {
@@ -754,7 +747,8 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
- zero_user(page, bh_offset(bh),
+ folio_zero_range(folio,
+ bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
@@ -773,7 +767,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
*/
if (bh_end <= pos || bh_pos >= end) {
if (!buffer_uptodate(bh)) {
- zero_user(page, bh_offset(bh),
+ folio_zero_range(folio, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
@@ -786,7 +780,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
u8 *kaddr;
unsigned pofs;
- kaddr = kmap_atomic(page);
+ kaddr = kmap_local_folio(folio, 0);
if (bh_pos < pos) {
pofs = bh_pos & ~PAGE_MASK;
memset(kaddr + pofs, 0, pos - bh_pos);
@@ -795,8 +789,8 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
pofs = end & ~PAGE_MASK;
memset(kaddr + pofs, 0, bh_end - end);
}
- kunmap_atomic(kaddr);
- flush_dcache_page(page);
+ kunmap_local(kaddr);
+ flush_dcache_folio(folio);
}
continue;
}
@@ -809,11 +803,12 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
initialized_size = ni->allocated_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (bh_pos > initialized_size) {
- if (PageUptodate(page)) {
+ if (folio_test_uptodate(folio)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
- zero_user(page, bh_offset(bh), blocksize);
+ folio_zero_range(folio, bh_offset(bh),
+ blocksize);
set_buffer_uptodate(bh);
}
continue;
@@ -927,17 +922,17 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
bh->b_blocknr = -1;
/*
* If the buffer is uptodate we skip it. If it
- * is not but the page is uptodate, we can set
- * the buffer uptodate. If the page is not
+ * is not but the folio is uptodate, we can set
+ * the buffer uptodate. If the folio is not
* uptodate, we can clear the buffer and set it
* uptodate. Whether this is worthwhile is
* debatable and this could be removed.
*/
- if (PageUptodate(page)) {
+ if (folio_test_uptodate(folio)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
- zero_user(page, bh_offset(bh),
+ folio_zero_range(folio, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
@@ -1167,7 +1162,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
} while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
/* If there are no errors, do the next page. */
if (likely(!err && ++u < nr_pages))
- goto do_next_page;
+ goto do_next_folio;
/* If there are no errors, release the runlist lock if we took it. */
if (likely(!err)) {
if (unlikely(rl_write_locked)) {
@@ -1185,9 +1180,8 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
bh = *--wait_bh;
wait_on_buffer(bh);
if (likely(buffer_uptodate(bh))) {
- page = bh->b_page;
- bh_pos = ((s64)page->index << PAGE_SHIFT) +
- bh_offset(bh);
+ folio = bh->b_folio;
+ bh_pos = folio_pos(folio) + bh_offset(bh);
/*
* If the buffer overflows the initialized size, need
* to zero the overflowing region.
@@ -1197,7 +1191,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
if (likely(bh_pos < initialized_size))
ofs = initialized_size - bh_pos;
- zero_user_segment(page, bh_offset(bh) + ofs,
+ folio_zero_segment(folio, bh_offset(bh) + ofs,
blocksize);
}
} else /* if (unlikely(!buffer_uptodate(bh))) */
@@ -1324,21 +1318,20 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
u = 0;
end = bh_cpos << vol->cluster_size_bits;
do {
- page = pages[u];
- bh = head = page_buffers(page);
+ folio = page_folio(pages[u]);
+ bh = head = folio_buffers(folio);
do {
if (u == nr_pages &&
- ((s64)page->index << PAGE_SHIFT) +
- bh_offset(bh) >= end)
+ folio_pos(folio) + bh_offset(bh) >= end)
break;
if (!buffer_new(bh))
continue;
clear_buffer_new(bh);
if (!buffer_uptodate(bh)) {
- if (PageUptodate(page))
+ if (folio_test_uptodate(folio))
set_buffer_uptodate(bh);
else {
- zero_user(page, bh_offset(bh),
+ folio_zero_range(folio, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
--
2.40.1
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