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ntfs: convert ntfs_prepare_pages_for_non_resident_write() to folios

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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().

Link: https://lkml.kernel.org/r/20231016201114.1928083-20-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Pankaj Raghav <p.raghav@samsung.com>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-10-16 21:11:06 +01:00 committed by Andrew Morton
parent a04eb7cb18
commit 24a7b35285
1 changed files with 41 additions and 48 deletions
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89
fs/ntfs/file.c
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@ -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);
}