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NFS: Convert nfs_write_begin/end to use folios 

Add a helper nfs_folio_grab_cache_write_begin() that can call
__filemap_get_folio() directly with the appropriate parameters.

Since write_begin()/write_end() take struct page arguments, just pass
the folio->page back for now.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2023-01-19 16:33:45 -05:00 committed by Anna Schumaker
parent 4cbf76948c
commit 54d99381b7
1 changed files with 41 additions and 34 deletions
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75
fs/nfs/file.c
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@ -276,27 +276,28 @@ EXPORT_SYMBOL_GPL(nfs_file_fsync);
* and that the new data won't completely replace the old data in
* that range of the file.
*/
static bool nfs_full_page_write(struct page *page, loff_t pos, unsigned int len)
static bool nfs_folio_is_full_write(struct folio *folio, loff_t pos,
unsigned int len)
{
unsigned int pglen = nfs_page_length(page);
unsigned int offset = pos & (PAGE_SIZE - 1);
unsigned int pglen = nfs_folio_length(folio);
unsigned int offset = offset_in_folio(folio, pos);
unsigned int end = offset + len;
return !pglen || (end >= pglen && !offset);
}
static bool nfs_want_read_modify_write(struct file *file, struct page *page,
loff_t pos, unsigned int len)
static bool nfs_want_read_modify_write(struct file *file, struct folio *folio,
loff_t pos, unsigned int len)
{
/*
* Up-to-date pages, those with ongoing or full-page write
* don't need read/modify/write
*/
if (PageUptodate(page) || PagePrivate(page) ||
nfs_full_page_write(page, pos, len))
if (folio_test_uptodate(folio) || folio_test_private(folio) ||
nfs_folio_is_full_write(folio, pos, len))
return false;
if (pnfs_ld_read_whole_page(file->f_mapping->host))
if (pnfs_ld_read_whole_page(file_inode(file)))
return true;
/* Open for reading too? */
if (file->f_mode & FMODE_READ)
@ -304,6 +305,15 @@ static bool nfs_want_read_modify_write(struct file *file, struct page *page,
return false;
}
static struct folio *
nfs_folio_grab_cache_write_begin(struct address_space *mapping, pgoff_t index)
{
unsigned fgp_flags = FGP_LOCK | FGP_WRITE | FGP_CREAT | FGP_STABLE;
return __filemap_get_folio(mapping, index, fgp_flags,
mapping_gfp_mask(mapping));
}
/*
* This does the "real" work of the write. We must allocate and lock the
* page to be sent back to the generic routine, which then copies the
@ -313,34 +323,31 @@ static bool nfs_want_read_modify_write(struct file *file, struct page *page,
* increment the page use counts until he is done with the page.
*/
static int nfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len,
struct page **pagep, void **fsdata)
loff_t pos, unsigned len, struct page **pagep,
void **fsdata)
{
int ret;
pgoff_t index = pos >> PAGE_SHIFT;
struct page *page;
struct folio *folio;
int once_thru = 0;
int ret;
dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
file, mapping->host->i_ino, len, (long long) pos);
start:
page = grab_cache_page_write_begin(mapping, index);
if (!page)
folio = nfs_folio_grab_cache_write_begin(mapping, pos >> PAGE_SHIFT);
if (!folio)
return -ENOMEM;
*pagep = page;
folio = page_folio(page);
*pagep = &folio->page;
ret = nfs_flush_incompatible(file, folio);
if (ret) {
unlock_page(page);
put_page(page);
folio_unlock(folio);
folio_put(folio);
} else if (!once_thru &&
nfs_want_read_modify_write(file, page, pos, len)) {
nfs_want_read_modify_write(file, folio, pos, len)) {
once_thru = 1;
ret = nfs_read_folio(file, folio);
put_page(page);
folio_put(folio);
if (!ret)
goto start;
}
@ -348,12 +355,12 @@ start:
}
static int nfs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
unsigned offset = pos & (PAGE_SIZE - 1);
struct nfs_open_context *ctx = nfs_file_open_context(file);
struct folio *folio = page_folio(page);
unsigned offset = offset_in_folio(folio, pos);
int status;
dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
@ -363,26 +370,26 @@ static int nfs_write_end(struct file *file, struct address_space *mapping,
* Zero any uninitialised parts of the page, and then mark the page
* as up to date if it turns out that we're extending the file.
*/
if (!PageUptodate(page)) {
unsigned pglen = nfs_page_length(page);
if (!folio_test_uptodate(folio)) {
size_t fsize = folio_size(folio);
unsigned pglen = nfs_folio_length(folio);
unsigned end = offset + copied;
if (pglen == 0) {
zero_user_segments(page, 0, offset,
end, PAGE_SIZE);
SetPageUptodate(page);
folio_zero_segments(folio, 0, offset, end, fsize);
folio_mark_uptodate(folio);
} else if (end >= pglen) {
zero_user_segment(page, end, PAGE_SIZE);
folio_zero_segment(folio, end, fsize);
if (offset == 0)
SetPageUptodate(page);
folio_mark_uptodate(folio);
} else
zero_user_segment(page, pglen, PAGE_SIZE);
folio_zero_segment(folio, pglen, fsize);
}
status = nfs_update_folio(file, folio, offset, copied);
unlock_page(page);
put_page(page);
folio_unlock(folio);
folio_put(folio);
if (status < 0)
return status;