niansa-misc/linux
1
0
Fork 0
mirror of synced 2025-03-06 20:59:54 +01:00
Code Issues Projects Releases Packages Wiki Activity

NFS: Convert readdir page array functions to use a folio

Browse source 
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Anna Schumaker 2023-04-04 15:12:52 -04:00
parent 61f02e0ab8
commit ec108d3cc7
1 changed files with 99 additions and 102 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

187
fs/nfs/dir.c
View file

@ -55,7 +55,7 @@ static int nfs_closedir(struct inode *, struct file *);
static int nfs_readdir(struct file *, struct dir_context *); static int nfs_readdir(struct file *, struct dir_context *);
static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); static int nfs_fsync_dir(struct file *, loff_t, loff_t, int);
static loff_t nfs_llseek_dir(struct file *, loff_t, int); static loff_t nfs_llseek_dir(struct file *, loff_t, int);
static void nfs_readdir_free_folio(struct folio *); static void nfs_readdir_clear_array(struct folio *);
const struct file_operations nfs_dir_operations = { const struct file_operations nfs_dir_operations = {
.llseek = nfs_llseek_dir, .llseek = nfs_llseek_dir,
@ -67,7 +67,7 @@ const struct file_operations nfs_dir_operations = {
}; };
const struct address_space_operations nfs_dir_aops = { const struct address_space_operations nfs_dir_aops = {
.free_folio = nfs_readdir_free_folio, .free_folio = nfs_readdir_clear_array,
}; };
#define NFS_INIT_DTSIZE PAGE_SIZE #define NFS_INIT_DTSIZE PAGE_SIZE
@ -146,8 +146,8 @@ struct nfs_cache_array {
u64 change_attr; u64 change_attr;
u64 last_cookie; u64 last_cookie;
unsigned int size; unsigned int size;
unsigned char page_full : 1, unsigned char folio_full : 1,
page_is_eof : 1, folio_is_eof : 1,
cookies_are_ordered : 1; cookies_are_ordered : 1;
struct nfs_cache_array_entry array[]; struct nfs_cache_array_entry array[];
}; };
@ -198,17 +198,17 @@ static void nfs_grow_dtsize(struct nfs_readdir_descriptor *desc)
nfs_set_dtsize(desc, desc->dtsize << 1); nfs_set_dtsize(desc, desc->dtsize << 1);
} }
static void nfs_readdir_page_init_array(struct page *page, u64 last_cookie, static void nfs_readdir_folio_init_array(struct folio *folio, u64 last_cookie,
u64 change_attr) u64 change_attr)
{ {
struct nfs_cache_array *array; struct nfs_cache_array *array;
array = kmap_local_page(page); array = kmap_local_folio(folio, 0);
array->change_attr = change_attr; array->change_attr = change_attr;
array->last_cookie = last_cookie; array->last_cookie = last_cookie;
array->size = 0; array->size = 0;
array->page_full = 0; array->folio_full = 0;
array->page_is_eof = 0; array->folio_is_eof = 0;
array->cookies_are_ordered = 1; array->cookies_are_ordered = 1;
kunmap_local(array); kunmap_local(array);
} }
@ -216,44 +216,39 @@ static void nfs_readdir_page_init_array(struct page *page, u64 last_cookie,
/* /*
* we are freeing strings created by nfs_add_to_readdir_array() * we are freeing strings created by nfs_add_to_readdir_array()
*/ */
static void nfs_readdir_clear_array(struct page *page) static void nfs_readdir_clear_array(struct folio *folio)
{ {
struct nfs_cache_array *array; struct nfs_cache_array *array;
unsigned int i; unsigned int i;
array = kmap_local_page(page); array = kmap_local_folio(folio, 0);
for (i = 0; i < array->size; i++) for (i = 0; i < array->size; i++)
kfree(array->array[i].name); kfree(array->array[i].name);
array->size = 0; array->size = 0;
kunmap_local(array); kunmap_local(array);
} }
static void nfs_readdir_free_folio(struct folio *folio) static void nfs_readdir_folio_reinit_array(struct folio *folio, u64 last_cookie,
{
nfs_readdir_clear_array(&folio->page);
}
static void nfs_readdir_page_reinit_array(struct page *page, u64 last_cookie,
u64 change_attr) u64 change_attr)
{ {
nfs_readdir_clear_array(page); nfs_readdir_clear_array(folio);
nfs_readdir_page_init_array(page, last_cookie, change_attr); nfs_readdir_folio_init_array(folio, last_cookie, change_attr);
} }
static struct page * static struct folio *
nfs_readdir_page_array_alloc(u64 last_cookie, gfp_t gfp_flags) nfs_readdir_folio_array_alloc(u64 last_cookie, gfp_t gfp_flags)
{ {
struct page *page = alloc_page(gfp_flags); struct folio *folio = folio_alloc(gfp_flags, 0);
if (page) if (folio)
nfs_readdir_page_init_array(page, last_cookie, 0); nfs_readdir_folio_init_array(folio, last_cookie, 0);
return page; return folio;
} }
static void nfs_readdir_page_array_free(struct page *page) static void nfs_readdir_folio_array_free(struct folio *folio)
{ {
if (page) { if (folio) {
nfs_readdir_clear_array(page); nfs_readdir_clear_array(folio);
put_page(page); folio_put(folio);
} }
} }
@ -264,13 +259,13 @@ static u64 nfs_readdir_array_index_cookie(struct nfs_cache_array *array)
static void nfs_readdir_array_set_eof(struct nfs_cache_array *array) static void nfs_readdir_array_set_eof(struct nfs_cache_array *array)
{ {
array->page_is_eof = 1; array->folio_is_eof = 1;
array->page_full = 1; array->folio_full = 1;
} }
static bool nfs_readdir_array_is_full(struct nfs_cache_array *array) static bool nfs_readdir_array_is_full(struct nfs_cache_array *array)
{ {
return array->page_full; return array->folio_full;
} }
/* /*
@ -302,16 +297,16 @@ static size_t nfs_readdir_array_maxentries(void)
*/ */
static int nfs_readdir_array_can_expand(struct nfs_cache_array *array) static int nfs_readdir_array_can_expand(struct nfs_cache_array *array)
{ {
if (array->page_full) if (array->folio_full)
return -ENOSPC; return -ENOSPC;
if (array->size == nfs_readdir_array_maxentries()) { if (array->size == nfs_readdir_array_maxentries()) {
array->page_full = 1; array->folio_full = 1;
return -ENOSPC; return -ENOSPC;
} }
return 0; return 0;
} }
static int nfs_readdir_page_array_append(struct page *page, static int nfs_readdir_folio_array_append(struct folio *folio,
const struct nfs_entry *entry, const struct nfs_entry *entry,
u64 *cookie) u64 *cookie)
{ {
@ -322,7 +317,7 @@ static int nfs_readdir_page_array_append(struct page *page,
name = nfs_readdir_copy_name(entry->name, entry->len); name = nfs_readdir_copy_name(entry->name, entry->len);
array = kmap_atomic(page); array = kmap_atomic(folio_page(folio, 0));
if (!name) if (!name)
goto out; goto out;
ret = nfs_readdir_array_can_expand(array); ret = nfs_readdir_array_can_expand(array);
@ -361,17 +356,17 @@ out:
* 127 readdir entries for a typical 64-bit system, that works out to a * 127 readdir entries for a typical 64-bit system, that works out to a
* cache of ~ 33 million entries per directory. * cache of ~ 33 million entries per directory.
*/ */
static pgoff_t nfs_readdir_page_cookie_hash(u64 cookie) static pgoff_t nfs_readdir_folio_cookie_hash(u64 cookie)
{ {
if (cookie == 0) if (cookie == 0)
return 0; return 0;
return hash_64(cookie, 18); return hash_64(cookie, 18);
} }
static bool nfs_readdir_page_validate(struct page *page, u64 last_cookie, static bool nfs_readdir_folio_validate(struct folio *folio, u64 last_cookie,
u64 change_attr) u64 change_attr)
{ {
struct nfs_cache_array *array = kmap_local_page(page); struct nfs_cache_array *array = kmap_local_folio(folio, 0);
int ret = true; int ret = true;
if (array->change_attr != change_attr) if (array->change_attr != change_attr)
@ -382,81 +377,83 @@ static bool nfs_readdir_page_validate(struct page *page, u64 last_cookie,
return ret; return ret;
} }
static void nfs_readdir_page_unlock_and_put(struct page *page) static void nfs_readdir_folio_unlock_and_put(struct folio *folio)
{ {
unlock_page(page); folio_unlock(folio);
put_page(page); folio_put(folio);
} }
static void nfs_readdir_page_init_and_validate(struct page *page, u64 cookie, static void nfs_readdir_folio_init_and_validate(struct folio *folio, u64 cookie,
u64 change_attr) u64 change_attr)
{ {
if (PageUptodate(page)) { if (folio_test_uptodate(folio)) {
if (nfs_readdir_page_validate(page, cookie, change_attr)) if (nfs_readdir_folio_validate(folio, cookie, change_attr))
return; return;
nfs_readdir_clear_array(page); nfs_readdir_clear_array(folio);
} }
nfs_readdir_page_init_array(page, cookie, change_attr); nfs_readdir_folio_init_array(folio, cookie, change_attr);
SetPageUptodate(page); folio_mark_uptodate(folio);
} }
static struct page *nfs_readdir_page_get_locked(struct address_space *mapping, static struct folio *nfs_readdir_folio_get_locked(struct address_space *mapping,
u64 cookie, u64 change_attr) u64 cookie, u64 change_attr)
{ {
pgoff_t index = nfs_readdir_page_cookie_hash(cookie); pgoff_t index = nfs_readdir_folio_cookie_hash(cookie);
struct page *page; struct folio *folio;
page = grab_cache_page(mapping, index); folio = filemap_grab_folio(mapping, index);
if (!page) if (!folio)
return NULL; return NULL;
nfs_readdir_page_init_and_validate(page, cookie, change_attr); nfs_readdir_folio_init_and_validate(folio, cookie, change_attr);
return page; return folio;
} }
static u64 nfs_readdir_page_last_cookie(struct page *page) static u64 nfs_readdir_folio_last_cookie(struct folio *folio)
{ {
struct nfs_cache_array *array; struct nfs_cache_array *array;
u64 ret; u64 ret;
array = kmap_local_page(page); array = kmap_local_folio(folio, 0);
ret = array->last_cookie; ret = array->last_cookie;
kunmap_local(array); kunmap_local(array);
return ret; return ret;
} }
static bool nfs_readdir_page_needs_filling(struct page *page) static bool nfs_readdir_folio_needs_filling(struct folio *folio)
{ {
struct nfs_cache_array *array; struct nfs_cache_array *array;
bool ret; bool ret;
array = kmap_local_page(page); array = kmap_local_folio(folio, 0);
ret = !nfs_readdir_array_is_full(array); ret = !nfs_readdir_array_is_full(array);
kunmap_local(array); kunmap_local(array);
return ret; return ret;
} }
static void nfs_readdir_page_set_eof(struct page *page) static void nfs_readdir_folio_set_eof(struct folio *folio)
{ {
struct nfs_cache_array *array; struct nfs_cache_array *array;
array = kmap_local_page(page); array = kmap_local_folio(folio, 0);
nfs_readdir_array_set_eof(array); nfs_readdir_array_set_eof(array);
kunmap_local(array); kunmap_local(array);
} }
static struct page *nfs_readdir_page_get_next(struct address_space *mapping, static struct folio *nfs_readdir_folio_get_next(struct address_space *mapping,
u64 cookie, u64 change_attr) u64 cookie, u64 change_attr)
{ {
pgoff_t index = nfs_readdir_page_cookie_hash(cookie); pgoff_t index = nfs_readdir_folio_cookie_hash(cookie);
struct page *page; struct folio *folio;
page = grab_cache_page_nowait(mapping, index); folio = __filemap_get_folio(mapping, index,
if (!page) FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
mapping_gfp_mask(mapping));
if (!folio)
return NULL; return NULL;
nfs_readdir_page_init_and_validate(page, cookie, change_attr); nfs_readdir_folio_init_and_validate(folio, cookie, change_attr);
if (nfs_readdir_page_last_cookie(page) != cookie) if (nfs_readdir_folio_last_cookie(folio) != cookie)
nfs_readdir_page_reinit_array(page, cookie, change_attr); nfs_readdir_folio_reinit_array(folio, cookie, change_attr);
return page; return folio;
} }
static inline static inline
@ -481,7 +478,7 @@ bool nfs_readdir_use_cookie(const struct file *filp)
static void nfs_readdir_seek_next_array(struct nfs_cache_array *array, static void nfs_readdir_seek_next_array(struct nfs_cache_array *array,
struct nfs_readdir_descriptor *desc) struct nfs_readdir_descriptor *desc)
{ {
if (array->page_full) { if (array->folio_full) {
desc->last_cookie = array->last_cookie; desc->last_cookie = array->last_cookie;
desc->current_index += array->size; desc->current_index += array->size;
desc->cache_entry_index = 0; desc->cache_entry_index = 0;
@ -506,7 +503,7 @@ static int nfs_readdir_search_for_pos(struct nfs_cache_array *array,
if (diff < 0) if (diff < 0)
goto out_eof; goto out_eof;
if (diff >= array->size) { if (diff >= array->size) {
if (array->page_is_eof) if (array->folio_is_eof)
goto out_eof; goto out_eof;
nfs_readdir_seek_next_array(array, desc); nfs_readdir_seek_next_array(array, desc);
return -EAGAIN; return -EAGAIN;
@ -554,7 +551,7 @@ static int nfs_readdir_search_for_cookie(struct nfs_cache_array *array,
} }
} }
check_eof: check_eof:
if (array->page_is_eof) { if (array->folio_is_eof) {
status = -EBADCOOKIE; status = -EBADCOOKIE;
if (desc->dir_cookie == array->last_cookie) if (desc->dir_cookie == array->last_cookie)
desc->eof = true; desc->eof = true;
@ -826,9 +823,9 @@ static int nfs_readdir_folio_filler(struct nfs_readdir_descriptor *desc,
u64 change_attr) u64 change_attr)
{ {
struct address_space *mapping = desc->file->f_mapping; struct address_space *mapping = desc->file->f_mapping;
struct folio *folio = *arrays; struct folio *new, *folio = *arrays;
struct xdr_stream stream; struct xdr_stream stream;
struct page *scratch, *new; struct page *scratch;
struct xdr_buf buf; struct xdr_buf buf;
u64 cookie; u64 cookie;
int status; int status;
@ -845,36 +842,36 @@ static int nfs_readdir_folio_filler(struct nfs_readdir_descriptor *desc,
if (status != 0) if (status != 0)
break; break;
status = nfs_readdir_page_array_append(folio_page(folio, 0), entry, &cookie); status = nfs_readdir_folio_array_append(folio, entry, &cookie);
if (status != -ENOSPC) if (status != -ENOSPC)
continue; continue;
if (folio->mapping != mapping) { if (folio->mapping != mapping) {
if (!--narrays) if (!--narrays)
break; break;
new = nfs_readdir_page_array_alloc(cookie, GFP_KERNEL); new = nfs_readdir_folio_array_alloc(cookie, GFP_KERNEL);
if (!new) if (!new)
break; break;
arrays++; arrays++;
*arrays = folio = page_folio(new); *arrays = folio = new;
} else { } else {
new = nfs_readdir_page_get_next(mapping, cookie, new = nfs_readdir_folio_get_next(mapping, cookie,
change_attr); change_attr);
if (!new) if (!new)
break; break;
if (folio != *arrays) if (folio != *arrays)
nfs_readdir_page_unlock_and_put(folio_page(folio, 0)); nfs_readdir_folio_unlock_and_put(folio);
folio = page_folio(new); folio = new;
} }
desc->folio_index_max++; desc->folio_index_max++;
status = nfs_readdir_page_array_append(folio_page(folio, 0), entry, &cookie); status = nfs_readdir_folio_array_append(folio, entry, &cookie);
} while (!status && !entry->eof); } while (!status && !entry->eof);
switch (status) { switch (status) {
case -EBADCOOKIE: case -EBADCOOKIE:
if (!entry->eof) if (!entry->eof)
break; break;
nfs_readdir_page_set_eof(folio_page(folio, 0)); nfs_readdir_folio_set_eof(folio);
fallthrough; fallthrough;
case -EAGAIN: case -EAGAIN:
status = 0; status = 0;
@ -888,7 +885,7 @@ static int nfs_readdir_folio_filler(struct nfs_readdir_descriptor *desc,
} }
if (folio != *arrays) if (folio != *arrays)
nfs_readdir_page_unlock_and_put(folio_page(folio, 0)); nfs_readdir_folio_unlock_and_put(folio);
put_page(scratch); put_page(scratch);
return status; return status;
@ -943,7 +940,7 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
entry = kzalloc(sizeof(*entry), GFP_KERNEL); entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) if (!entry)
return -ENOMEM; return -ENOMEM;
entry->cookie = nfs_readdir_page_last_cookie(folio_page(folio, 0)); entry->cookie = nfs_readdir_folio_last_cookie(folio);
entry->fh = nfs_alloc_fhandle(); entry->fh = nfs_alloc_fhandle();
entry->fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); entry->fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
entry->server = NFS_SERVER(inode); entry->server = NFS_SERVER(inode);
@ -966,7 +963,7 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
status = nfs_readdir_folio_filler(desc, entry, pages, pglen, status = nfs_readdir_folio_filler(desc, entry, pages, pglen,
arrays, narrays, change_attr); arrays, narrays, change_attr);
else else
nfs_readdir_page_set_eof(folio_page(folio, 0)); nfs_readdir_folio_set_eof(folio);
desc->buffer_fills++; desc->buffer_fills++;
free_pages: free_pages:
@ -997,14 +994,14 @@ nfs_readdir_folio_get_cached(struct nfs_readdir_descriptor *desc)
struct address_space *mapping = desc->file->f_mapping; struct address_space *mapping = desc->file->f_mapping;
u64 change_attr = inode_peek_iversion_raw(mapping->host); u64 change_attr = inode_peek_iversion_raw(mapping->host);
u64 cookie = desc->last_cookie; u64 cookie = desc->last_cookie;
struct page *page; struct folio *folio;
page = nfs_readdir_page_get_locked(mapping, cookie, change_attr); folio = nfs_readdir_folio_get_locked(mapping, cookie, change_attr);
if (!page) if (!folio)
return NULL; return NULL;
if (desc->clear_cache && !nfs_readdir_page_needs_filling(page)) if (desc->clear_cache && !nfs_readdir_folio_needs_filling(folio))
nfs_readdir_page_reinit_array(page, cookie, change_attr); nfs_readdir_folio_reinit_array(folio, cookie, change_attr);
return page_folio(page); return folio;
} }
/* /*
@ -1021,7 +1018,7 @@ static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc)
desc->folio = nfs_readdir_folio_get_cached(desc); desc->folio = nfs_readdir_folio_get_cached(desc);
if (!desc->folio) if (!desc->folio)
return -ENOMEM; return -ENOMEM;
if (nfs_readdir_page_needs_filling(folio_page(desc->folio, 0))) { if (nfs_readdir_folio_needs_filling(desc->folio)) {
/* Grow the dtsize if we had to go back for more pages */ /* Grow the dtsize if we had to go back for more pages */
if (desc->folio_index == desc->folio_index_max) if (desc->folio_index == desc->folio_index_max)
nfs_grow_dtsize(desc); nfs_grow_dtsize(desc);
@ -1115,7 +1112,7 @@ static void nfs_do_filldir(struct nfs_readdir_descriptor *desc,
break; break;
} }
} }
if (array->page_is_eof) if (array->folio_is_eof)
desc->eof = !desc->eob; desc->eof = !desc->eob;
kunmap_local(array); kunmap_local(array);
@ -1148,7 +1145,7 @@ static int uncached_readdir(struct nfs_readdir_descriptor *desc)
arrays = kcalloc(sz, sizeof(*arrays), GFP_KERNEL); arrays = kcalloc(sz, sizeof(*arrays), GFP_KERNEL);
if (!arrays) if (!arrays)
goto out; goto out;
arrays[0] = page_folio(nfs_readdir_page_array_alloc(desc->dir_cookie, GFP_KERNEL)); arrays[0] = nfs_readdir_folio_array_alloc(desc->dir_cookie, GFP_KERNEL);
if (!arrays[0]) if (!arrays[0])
goto out; goto out;
@ -1185,7 +1182,7 @@ static int uncached_readdir(struct nfs_readdir_descriptor *desc)
} }
out_free: out_free:
for (i = 0; i < sz && arrays[i]; i++) for (i = 0; i < sz && arrays[i]; i++)
nfs_readdir_page_array_free(folio_page(arrays[i], 0)); nfs_readdir_folio_array_free(arrays[i]);
out: out:
if (!nfs_readdir_use_cookie(desc->file)) if (!nfs_readdir_use_cookie(desc->file))
nfs_readdir_rewind_search(desc); nfs_readdir_rewind_search(desc);