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NFS: Convert the readdir array-of-pages into an array-of-folios
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This patch only converts the actual array, but doesn't touch the
individual nfs_cache_array pages and related functions (that will be
done in the next patch).

I also adjust the names of the fields in the nfs_readdir_descriptor to
say "folio" instead of "page".

Signed-off-by: Anna Schumaker <[email protected]>
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@amschuma-ntap
amschuma-ntap committed Apr 12, 2023
1 parent 3db63da commit 61f02e0
Showing 1 changed file with 65 additions and 64 deletions.
129 changes: 65 additions & 64 deletions fs/nfs/dir.c
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Original file line number Diff line number Diff line change
Expand Up @@ -154,10 +154,10 @@ struct nfs_cache_array {

struct nfs_readdir_descriptor {
struct file *file;
struct page *page;
struct folio *folio;
struct dir_context *ctx;
pgoff_t page_index;
pgoff_t page_index_max;
pgoff_t folio_index;
pgoff_t folio_index_max;
u64 dir_cookie;
u64 last_cookie;
loff_t current_index;
Expand Down Expand Up @@ -312,8 +312,8 @@ static int nfs_readdir_array_can_expand(struct nfs_cache_array *array)
}

static int nfs_readdir_page_array_append(struct page *page,
const struct nfs_entry *entry,
u64 *cookie)
const struct nfs_entry *entry,
u64 *cookie)
{
struct nfs_cache_array *array;
struct nfs_cache_array_entry *cache_entry;
Expand Down Expand Up @@ -485,7 +485,7 @@ static void nfs_readdir_seek_next_array(struct nfs_cache_array *array,
desc->last_cookie = array->last_cookie;
desc->current_index += array->size;
desc->cache_entry_index = 0;
desc->page_index++;
desc->folio_index++;
} else
desc->last_cookie = nfs_readdir_array_index_cookie(array);
}
Expand All @@ -494,7 +494,7 @@ static void nfs_readdir_rewind_search(struct nfs_readdir_descriptor *desc)
{
desc->current_index = 0;
desc->last_cookie = 0;
desc->page_index = 0;
desc->folio_index = 0;
}

static int nfs_readdir_search_for_pos(struct nfs_cache_array *array,
Expand Down Expand Up @@ -568,7 +568,7 @@ static int nfs_readdir_search_array(struct nfs_readdir_descriptor *desc)
struct nfs_cache_array *array;
int status;

array = kmap_local_page(desc->page);
array = kmap_local_folio(desc->folio, 0);

if (desc->dir_cookie == 0)
status = nfs_readdir_search_for_pos(array, desc);
Expand Down Expand Up @@ -819,16 +819,17 @@ static int nfs_readdir_entry_decode(struct nfs_readdir_descriptor *desc,
}

/* Perform conversion from xdr to cache array */
static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc,
struct nfs_entry *entry,
struct page **xdr_pages, unsigned int buflen,
struct page **arrays, size_t narrays,
u64 change_attr)
static int nfs_readdir_folio_filler(struct nfs_readdir_descriptor *desc,
struct nfs_entry *entry,
struct page **xdr_pages, unsigned int buflen,
struct folio **arrays, size_t narrays,
u64 change_attr)
{
struct address_space *mapping = desc->file->f_mapping;
struct folio *folio = *arrays;
struct xdr_stream stream;
struct page *scratch, *new;
struct xdr_buf buf;
struct page *scratch, *new, *page = *arrays;
u64 cookie;
int status;

Expand All @@ -844,36 +845,36 @@ static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc,
if (status != 0)
break;

status = nfs_readdir_page_array_append(page, entry, &cookie);
status = nfs_readdir_page_array_append(folio_page(folio, 0), entry, &cookie);
if (status != -ENOSPC)
continue;

if (page->mapping != mapping) {
if (folio->mapping != mapping) {
if (!--narrays)
break;
new = nfs_readdir_page_array_alloc(cookie, GFP_KERNEL);
if (!new)
break;
arrays++;
*arrays = page = new;
*arrays = folio = page_folio(new);
} else {
new = nfs_readdir_page_get_next(mapping, cookie,
change_attr);
if (!new)
break;
if (page != *arrays)
nfs_readdir_page_unlock_and_put(page);
page = new;
if (folio != *arrays)
nfs_readdir_page_unlock_and_put(folio_page(folio, 0));
folio = page_folio(new);
}
desc->page_index_max++;
status = nfs_readdir_page_array_append(page, entry, &cookie);
desc->folio_index_max++;
status = nfs_readdir_page_array_append(folio_page(folio, 0), entry, &cookie);
} while (!status && !entry->eof);

switch (status) {
case -EBADCOOKIE:
if (!entry->eof)
break;
nfs_readdir_page_set_eof(page);
nfs_readdir_page_set_eof(folio_page(folio, 0));
fallthrough;
case -EAGAIN:
status = 0;
Expand All @@ -886,8 +887,8 @@ static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc,
;
}

if (page != *arrays)
nfs_readdir_page_unlock_and_put(page);
if (folio != *arrays)
nfs_readdir_page_unlock_and_put(folio_page(folio, 0));

put_page(scratch);
return status;
Expand Down Expand Up @@ -927,11 +928,11 @@ static struct page **nfs_readdir_alloc_pages(size_t npages)

static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
__be32 *verf_arg, __be32 *verf_res,
struct page **arrays, size_t narrays)
struct folio **arrays, size_t narrays)
{
u64 change_attr;
struct page **pages;
struct page *page = *arrays;
struct folio *folio = *arrays;
struct nfs_entry *entry;
size_t array_size;
struct inode *inode = file_inode(desc->file);
Expand All @@ -942,7 +943,7 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->cookie = nfs_readdir_page_last_cookie(page);
entry->cookie = nfs_readdir_page_last_cookie(folio_page(folio, 0));
entry->fh = nfs_alloc_fhandle();
entry->fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
entry->server = NFS_SERVER(inode);
Expand All @@ -962,10 +963,10 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,

pglen = status;
if (pglen != 0)
status = nfs_readdir_page_filler(desc, entry, pages, pglen,
arrays, narrays, change_attr);
status = nfs_readdir_folio_filler(desc, entry, pages, pglen,
arrays, narrays, change_attr);
else
nfs_readdir_page_set_eof(page);
nfs_readdir_page_set_eof(folio_page(folio, 0));
desc->buffer_fills++;

free_pages:
Expand All @@ -977,21 +978,21 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
return status;
}

static void nfs_readdir_page_put(struct nfs_readdir_descriptor *desc)
static void nfs_readdir_folio_put(struct nfs_readdir_descriptor *desc)
{
put_page(desc->page);
desc->page = NULL;
folio_put(desc->folio);
desc->folio = NULL;
}

static void
nfs_readdir_page_unlock_and_put_cached(struct nfs_readdir_descriptor *desc)
nfs_readdir_folio_unlock_and_put_cached(struct nfs_readdir_descriptor *desc)
{
unlock_page(desc->page);
nfs_readdir_page_put(desc);
folio_unlock(desc->folio);
nfs_readdir_folio_put(desc);
}

static struct page *
nfs_readdir_page_get_cached(struct nfs_readdir_descriptor *desc)
static struct folio *
nfs_readdir_folio_get_cached(struct nfs_readdir_descriptor *desc)
{
struct address_space *mapping = desc->file->f_mapping;
u64 change_attr = inode_peek_iversion_raw(mapping->host);
Expand All @@ -1003,7 +1004,7 @@ nfs_readdir_page_get_cached(struct nfs_readdir_descriptor *desc)
return NULL;
if (desc->clear_cache && !nfs_readdir_page_needs_filling(page))
nfs_readdir_page_reinit_array(page, cookie, change_attr);
return page;
return page_folio(page);
}

/*
Expand All @@ -1017,21 +1018,21 @@ static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc)
__be32 verf[NFS_DIR_VERIFIER_SIZE];
int res;

desc->page = nfs_readdir_page_get_cached(desc);
if (!desc->page)
desc->folio = nfs_readdir_folio_get_cached(desc);
if (!desc->folio)
return -ENOMEM;
if (nfs_readdir_page_needs_filling(desc->page)) {
if (nfs_readdir_page_needs_filling(folio_page(desc->folio, 0))) {
/* Grow the dtsize if we had to go back for more pages */
if (desc->page_index == desc->page_index_max)
if (desc->folio_index == desc->folio_index_max)
nfs_grow_dtsize(desc);
desc->page_index_max = desc->page_index;
desc->folio_index_max = desc->folio_index;
trace_nfs_readdir_cache_fill(desc->file, nfsi->cookieverf,
desc->last_cookie,
desc->page->index, desc->dtsize);
desc->folio->index, desc->dtsize);
res = nfs_readdir_xdr_to_array(desc, nfsi->cookieverf, verf,
&desc->page, 1);
&desc->folio, 1);
if (res < 0) {
nfs_readdir_page_unlock_and_put_cached(desc);
nfs_readdir_folio_unlock_and_put_cached(desc);
trace_nfs_readdir_cache_fill_done(inode, res);
if (res == -EBADCOOKIE || res == -ENOTSYNC) {
invalidate_inode_pages2(desc->file->f_mapping);
Expand Down Expand Up @@ -1059,7 +1060,7 @@ static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc)
res = nfs_readdir_search_array(desc);
if (res == 0)
return 0;
nfs_readdir_page_unlock_and_put_cached(desc);
nfs_readdir_folio_unlock_and_put_cached(desc);
return res;
}

Expand Down Expand Up @@ -1087,7 +1088,7 @@ static void nfs_do_filldir(struct nfs_readdir_descriptor *desc,
unsigned int i;
bool first_emit = !desc->dir_cookie;

array = kmap_local_page(desc->page);
array = kmap_local_folio(desc->folio, 0);
for (i = desc->cache_entry_index; i < array->size; i++) {
struct nfs_cache_array_entry *ent;

Expand Down Expand Up @@ -1136,7 +1137,7 @@ static void nfs_do_filldir(struct nfs_readdir_descriptor *desc,
*/
static int uncached_readdir(struct nfs_readdir_descriptor *desc)
{
struct page **arrays;
struct folio **arrays;
size_t i, sz = 512;
__be32 verf[NFS_DIR_VERIFIER_SIZE];
int status = -ENOMEM;
Expand All @@ -1147,14 +1148,14 @@ static int uncached_readdir(struct nfs_readdir_descriptor *desc)
arrays = kcalloc(sz, sizeof(*arrays), GFP_KERNEL);
if (!arrays)
goto out;
arrays[0] = nfs_readdir_page_array_alloc(desc->dir_cookie, GFP_KERNEL);
arrays[0] = page_folio(nfs_readdir_page_array_alloc(desc->dir_cookie, GFP_KERNEL));
if (!arrays[0])
goto out;

desc->page_index = 0;
desc->folio_index = 0;
desc->cache_entry_index = 0;
desc->last_cookie = desc->dir_cookie;
desc->page_index_max = 0;
desc->folio_index_max = 0;

trace_nfs_readdir_uncached(desc->file, desc->verf, desc->last_cookie,
-1, desc->dtsize);
Expand All @@ -1166,10 +1167,10 @@ static int uncached_readdir(struct nfs_readdir_descriptor *desc)
}

for (i = 0; !desc->eob && i < sz && arrays[i]; i++) {
desc->page = arrays[i];
desc->folio = arrays[i];
nfs_do_filldir(desc, verf);
}
desc->page = NULL;
desc->folio = NULL;

/*
* Grow the dtsize if we have to go back for more pages,
Expand All @@ -1179,16 +1180,16 @@ static int uncached_readdir(struct nfs_readdir_descriptor *desc)
if (!desc->eob)
nfs_grow_dtsize(desc);
else if (desc->buffer_fills == 1 &&
i < (desc->page_index_max >> 1))
i < (desc->folio_index_max >> 1))
nfs_shrink_dtsize(desc);
}
out_free:
for (i = 0; i < sz && arrays[i]; i++)
nfs_readdir_page_array_free(arrays[i]);
nfs_readdir_page_array_free(folio_page(arrays[i], 0));
out:
if (!nfs_readdir_use_cookie(desc->file))
nfs_readdir_rewind_search(desc);
desc->page_index_max = -1;
desc->folio_index_max = -1;
kfree(arrays);
dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, status);
return status;
Expand Down Expand Up @@ -1240,11 +1241,11 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
goto out;
desc->file = file;
desc->ctx = ctx;
desc->page_index_max = -1;
desc->folio_index_max = -1;

spin_lock(&file->f_lock);
desc->dir_cookie = dir_ctx->dir_cookie;
desc->page_index = dir_ctx->page_index;
desc->folio_index = dir_ctx->page_index;
desc->last_cookie = dir_ctx->last_cookie;
desc->attr_gencount = dir_ctx->attr_gencount;
desc->eof = dir_ctx->eof;
Expand Down Expand Up @@ -1291,16 +1292,16 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
break;

nfs_do_filldir(desc, nfsi->cookieverf);
nfs_readdir_page_unlock_and_put_cached(desc);
if (desc->page_index == desc->page_index_max)
nfs_readdir_folio_unlock_and_put_cached(desc);
if (desc->folio_index == desc->folio_index_max)
desc->clear_cache = force_clear;
} while (!desc->eob && !desc->eof);

spin_lock(&file->f_lock);
dir_ctx->dir_cookie = desc->dir_cookie;
dir_ctx->last_cookie = desc->last_cookie;
dir_ctx->attr_gencount = desc->attr_gencount;
dir_ctx->page_index = desc->page_index;
dir_ctx->page_index = desc->folio_index;
dir_ctx->force_clear = force_clear;
dir_ctx->eof = desc->eof;
dir_ctx->dtsize = desc->dtsize;
Expand Down

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