netfs: Provide a writepages implementation
Provide an implementation of writepages for network filesystems to delegate to. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org
This commit is contained in:
David Howells
parent
e0ace6ca98
commit
62c3b7481b
|
|
@ -32,6 +32,18 @@ static void netfs_set_group(struct folio *folio, struct netfs_group *netfs_group
|
|||
folio_attach_private(folio, netfs_get_group(netfs_group));
|
||||
}
|
||||
|
||||
#if IS_ENABLED(CONFIG_FSCACHE)
|
||||
static void netfs_folio_start_fscache(bool caching, struct folio *folio)
|
||||
{
|
||||
if (caching)
|
||||
folio_start_fscache(folio);
|
||||
}
|
||||
#else
|
||||
static void netfs_folio_start_fscache(bool caching, struct folio *folio)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Decide how we should modify a folio. We might be attempting to do
|
||||
* write-streaming, in which case we don't want to a local RMW cycle if we can
|
||||
|
|
@ -475,3 +487,627 @@ out:
|
|||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(netfs_page_mkwrite);
|
||||
|
||||
/*
|
||||
* Kill all the pages in the given range
|
||||
*/
|
||||
static void netfs_kill_pages(struct address_space *mapping,
|
||||
loff_t start, loff_t len)
|
||||
{
|
||||
struct folio *folio;
|
||||
pgoff_t index = start / PAGE_SIZE;
|
||||
pgoff_t last = (start + len - 1) / PAGE_SIZE, next;
|
||||
|
||||
_enter("%llx-%llx", start, start + len - 1);
|
||||
|
||||
do {
|
||||
_debug("kill %lx (to %lx)", index, last);
|
||||
|
||||
folio = filemap_get_folio(mapping, index);
|
||||
if (IS_ERR(folio)) {
|
||||
next = index + 1;
|
||||
continue;
|
||||
}
|
||||
|
||||
next = folio_next_index(folio);
|
||||
|
||||
trace_netfs_folio(folio, netfs_folio_trace_kill);
|
||||
folio_clear_uptodate(folio);
|
||||
if (folio_test_fscache(folio))
|
||||
folio_end_fscache(folio);
|
||||
folio_end_writeback(folio);
|
||||
folio_lock(folio);
|
||||
generic_error_remove_page(mapping, &folio->page);
|
||||
folio_unlock(folio);
|
||||
folio_put(folio);
|
||||
|
||||
} while (index = next, index <= last);
|
||||
|
||||
_leave("");
|
||||
}
|
||||
|
||||
/*
|
||||
* Redirty all the pages in a given range.
|
||||
*/
|
||||
static void netfs_redirty_pages(struct address_space *mapping,
|
||||
loff_t start, loff_t len)
|
||||
{
|
||||
struct folio *folio;
|
||||
pgoff_t index = start / PAGE_SIZE;
|
||||
pgoff_t last = (start + len - 1) / PAGE_SIZE, next;
|
||||
|
||||
_enter("%llx-%llx", start, start + len - 1);
|
||||
|
||||
do {
|
||||
_debug("redirty %llx @%llx", len, start);
|
||||
|
||||
folio = filemap_get_folio(mapping, index);
|
||||
if (IS_ERR(folio)) {
|
||||
next = index + 1;
|
||||
continue;
|
||||
}
|
||||
|
||||
next = folio_next_index(folio);
|
||||
trace_netfs_folio(folio, netfs_folio_trace_redirty);
|
||||
filemap_dirty_folio(mapping, folio);
|
||||
if (folio_test_fscache(folio))
|
||||
folio_end_fscache(folio);
|
||||
folio_end_writeback(folio);
|
||||
folio_put(folio);
|
||||
} while (index = next, index <= last);
|
||||
|
||||
balance_dirty_pages_ratelimited(mapping);
|
||||
|
||||
_leave("");
|
||||
}
|
||||
|
||||
/*
|
||||
* Completion of write to server
|
||||
*/
|
||||
static void netfs_pages_written_back(struct netfs_io_request *wreq)
|
||||
{
|
||||
struct address_space *mapping = wreq->mapping;
|
||||
struct netfs_folio *finfo;
|
||||
struct netfs_group *group = NULL;
|
||||
struct folio *folio;
|
||||
pgoff_t last;
|
||||
int gcount = 0;
|
||||
|
||||
XA_STATE(xas, &mapping->i_pages, wreq->start / PAGE_SIZE);
|
||||
|
||||
_enter("%llx-%llx", wreq->start, wreq->start + wreq->len);
|
||||
|
||||
rcu_read_lock();
|
||||
|
||||
last = (wreq->start + wreq->len - 1) / PAGE_SIZE;
|
||||
xas_for_each(&xas, folio, last) {
|
||||
WARN(!folio_test_writeback(folio),
|
||||
"bad %zx @%llx page %lx %lx\n",
|
||||
wreq->len, wreq->start, folio_index(folio), last);
|
||||
|
||||
if ((finfo = netfs_folio_info(folio))) {
|
||||
/* Streaming writes cannot be redirtied whilst under
|
||||
* writeback, so discard the streaming record.
|
||||
*/
|
||||
folio_detach_private(folio);
|
||||
group = finfo->netfs_group;
|
||||
gcount++;
|
||||
trace_netfs_folio(folio, netfs_folio_trace_clear_s);
|
||||
kfree(finfo);
|
||||
} else if ((group = netfs_folio_group(folio))) {
|
||||
/* Need to detach the group pointer if the page didn't
|
||||
* get redirtied. If it has been redirtied, then it
|
||||
* must be within the same group.
|
||||
*/
|
||||
if (folio_test_dirty(folio)) {
|
||||
trace_netfs_folio(folio, netfs_folio_trace_redirtied);
|
||||
goto end_wb;
|
||||
}
|
||||
if (folio_trylock(folio)) {
|
||||
if (!folio_test_dirty(folio)) {
|
||||
folio_detach_private(folio);
|
||||
gcount++;
|
||||
trace_netfs_folio(folio, netfs_folio_trace_clear_g);
|
||||
} else {
|
||||
trace_netfs_folio(folio, netfs_folio_trace_redirtied);
|
||||
}
|
||||
folio_unlock(folio);
|
||||
goto end_wb;
|
||||
}
|
||||
|
||||
xas_pause(&xas);
|
||||
rcu_read_unlock();
|
||||
folio_lock(folio);
|
||||
if (!folio_test_dirty(folio)) {
|
||||
folio_detach_private(folio);
|
||||
gcount++;
|
||||
trace_netfs_folio(folio, netfs_folio_trace_clear_g);
|
||||
} else {
|
||||
trace_netfs_folio(folio, netfs_folio_trace_redirtied);
|
||||
}
|
||||
folio_unlock(folio);
|
||||
rcu_read_lock();
|
||||
} else {
|
||||
trace_netfs_folio(folio, netfs_folio_trace_clear);
|
||||
}
|
||||
end_wb:
|
||||
if (folio_test_fscache(folio))
|
||||
folio_end_fscache(folio);
|
||||
folio_end_writeback(folio);
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
netfs_put_group_many(group, gcount);
|
||||
_leave("");
|
||||
}
|
||||
|
||||
/*
|
||||
* Deal with the disposition of the folios that are under writeback to close
|
||||
* out the operation.
|
||||
*/
|
||||
static void netfs_cleanup_buffered_write(struct netfs_io_request *wreq)
|
||||
{
|
||||
struct address_space *mapping = wreq->mapping;
|
||||
|
||||
_enter("");
|
||||
|
||||
switch (wreq->error) {
|
||||
case 0:
|
||||
netfs_pages_written_back(wreq);
|
||||
break;
|
||||
|
||||
default:
|
||||
pr_notice("R=%08x Unexpected error %d\n", wreq->debug_id, wreq->error);
|
||||
fallthrough;
|
||||
case -EACCES:
|
||||
case -EPERM:
|
||||
case -ENOKEY:
|
||||
case -EKEYEXPIRED:
|
||||
case -EKEYREJECTED:
|
||||
case -EKEYREVOKED:
|
||||
case -ENETRESET:
|
||||
case -EDQUOT:
|
||||
case -ENOSPC:
|
||||
netfs_redirty_pages(mapping, wreq->start, wreq->len);
|
||||
break;
|
||||
|
||||
case -EROFS:
|
||||
case -EIO:
|
||||
case -EREMOTEIO:
|
||||
case -EFBIG:
|
||||
case -ENOENT:
|
||||
case -ENOMEDIUM:
|
||||
case -ENXIO:
|
||||
netfs_kill_pages(mapping, wreq->start, wreq->len);
|
||||
break;
|
||||
}
|
||||
|
||||
if (wreq->error)
|
||||
mapping_set_error(mapping, wreq->error);
|
||||
if (wreq->netfs_ops->done)
|
||||
wreq->netfs_ops->done(wreq);
|
||||
}
|
||||
|
||||
/*
|
||||
* Extend the region to be written back to include subsequent contiguously
|
||||
* dirty pages if possible, but don't sleep while doing so.
|
||||
*
|
||||
* If this page holds new content, then we can include filler zeros in the
|
||||
* writeback.
|
||||
*/
|
||||
static void netfs_extend_writeback(struct address_space *mapping,
|
||||
struct netfs_group *group,
|
||||
struct xa_state *xas,
|
||||
long *_count,
|
||||
loff_t start,
|
||||
loff_t max_len,
|
||||
bool caching,
|
||||
size_t *_len,
|
||||
size_t *_top)
|
||||
{
|
||||
struct netfs_folio *finfo;
|
||||
struct folio_batch fbatch;
|
||||
struct folio *folio;
|
||||
unsigned int i;
|
||||
pgoff_t index = (start + *_len) / PAGE_SIZE;
|
||||
size_t len;
|
||||
void *priv;
|
||||
bool stop = true;
|
||||
|
||||
folio_batch_init(&fbatch);
|
||||
|
||||
do {
|
||||
/* Firstly, we gather up a batch of contiguous dirty pages
|
||||
* under the RCU read lock - but we can't clear the dirty flags
|
||||
* there if any of those pages are mapped.
|
||||
*/
|
||||
rcu_read_lock();
|
||||
|
||||
xas_for_each(xas, folio, ULONG_MAX) {
|
||||
stop = true;
|
||||
if (xas_retry(xas, folio))
|
||||
continue;
|
||||
if (xa_is_value(folio))
|
||||
break;
|
||||
if (folio_index(folio) != index) {
|
||||
xas_reset(xas);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!folio_try_get_rcu(folio)) {
|
||||
xas_reset(xas);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Has the folio moved or been split? */
|
||||
if (unlikely(folio != xas_reload(xas))) {
|
||||
folio_put(folio);
|
||||
xas_reset(xas);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!folio_trylock(folio)) {
|
||||
folio_put(folio);
|
||||
xas_reset(xas);
|
||||
break;
|
||||
}
|
||||
if (!folio_test_dirty(folio) ||
|
||||
folio_test_writeback(folio) ||
|
||||
folio_test_fscache(folio)) {
|
||||
folio_unlock(folio);
|
||||
folio_put(folio);
|
||||
xas_reset(xas);
|
||||
break;
|
||||
}
|
||||
|
||||
stop = false;
|
||||
len = folio_size(folio);
|
||||
priv = folio_get_private(folio);
|
||||
if ((const struct netfs_group *)priv != group) {
|
||||
stop = true;
|
||||
finfo = netfs_folio_info(folio);
|
||||
if (finfo->netfs_group != group ||
|
||||
finfo->dirty_offset > 0) {
|
||||
folio_unlock(folio);
|
||||
folio_put(folio);
|
||||
xas_reset(xas);
|
||||
break;
|
||||
}
|
||||
len = finfo->dirty_len;
|
||||
}
|
||||
|
||||
*_top += folio_size(folio);
|
||||
index += folio_nr_pages(folio);
|
||||
*_count -= folio_nr_pages(folio);
|
||||
*_len += len;
|
||||
if (*_len >= max_len || *_count <= 0)
|
||||
stop = true;
|
||||
|
||||
if (!folio_batch_add(&fbatch, folio))
|
||||
break;
|
||||
if (stop)
|
||||
break;
|
||||
}
|
||||
|
||||
xas_pause(xas);
|
||||
rcu_read_unlock();
|
||||
|
||||
/* Now, if we obtained any folios, we can shift them to being
|
||||
* writable and mark them for caching.
|
||||
*/
|
||||
if (!folio_batch_count(&fbatch))
|
||||
break;
|
||||
|
||||
for (i = 0; i < folio_batch_count(&fbatch); i++) {
|
||||
folio = fbatch.folios[i];
|
||||
trace_netfs_folio(folio, netfs_folio_trace_store_plus);
|
||||
|
||||
if (!folio_clear_dirty_for_io(folio))
|
||||
BUG();
|
||||
folio_start_writeback(folio);
|
||||
netfs_folio_start_fscache(caching, folio);
|
||||
folio_unlock(folio);
|
||||
}
|
||||
|
||||
folio_batch_release(&fbatch);
|
||||
cond_resched();
|
||||
} while (!stop);
|
||||
}
|
||||
|
||||
/*
|
||||
* Synchronously write back the locked page and any subsequent non-locked dirty
|
||||
* pages.
|
||||
*/
|
||||
static ssize_t netfs_write_back_from_locked_folio(struct address_space *mapping,
|
||||
struct writeback_control *wbc,
|
||||
struct netfs_group *group,
|
||||
struct xa_state *xas,
|
||||
struct folio *folio,
|
||||
unsigned long long start,
|
||||
unsigned long long end)
|
||||
{
|
||||
struct netfs_io_request *wreq;
|
||||
struct netfs_folio *finfo;
|
||||
struct netfs_inode *ctx = netfs_inode(mapping->host);
|
||||
unsigned long long i_size = i_size_read(&ctx->inode);
|
||||
size_t len, max_len;
|
||||
bool caching = netfs_is_cache_enabled(ctx);
|
||||
long count = wbc->nr_to_write;
|
||||
int ret;
|
||||
|
||||
_enter(",%lx,%llx-%llx,%u", folio_index(folio), start, end, caching);
|
||||
|
||||
wreq = netfs_alloc_request(mapping, NULL, start, folio_size(folio),
|
||||
NETFS_WRITEBACK);
|
||||
if (IS_ERR(wreq)) {
|
||||
folio_unlock(folio);
|
||||
return PTR_ERR(wreq);
|
||||
}
|
||||
|
||||
if (!folio_clear_dirty_for_io(folio))
|
||||
BUG();
|
||||
folio_start_writeback(folio);
|
||||
netfs_folio_start_fscache(caching, folio);
|
||||
|
||||
count -= folio_nr_pages(folio);
|
||||
|
||||
/* Find all consecutive lockable dirty pages that have contiguous
|
||||
* written regions, stopping when we find a page that is not
|
||||
* immediately lockable, is not dirty or is missing, or we reach the
|
||||
* end of the range.
|
||||
*/
|
||||
trace_netfs_folio(folio, netfs_folio_trace_store);
|
||||
|
||||
len = wreq->len;
|
||||
finfo = netfs_folio_info(folio);
|
||||
if (finfo) {
|
||||
start += finfo->dirty_offset;
|
||||
if (finfo->dirty_offset + finfo->dirty_len != len) {
|
||||
len = finfo->dirty_len;
|
||||
goto cant_expand;
|
||||
}
|
||||
len = finfo->dirty_len;
|
||||
}
|
||||
|
||||
if (start < i_size) {
|
||||
/* Trim the write to the EOF; the extra data is ignored. Also
|
||||
* put an upper limit on the size of a single storedata op.
|
||||
*/
|
||||
max_len = 65536 * 4096;
|
||||
max_len = min_t(unsigned long long, max_len, end - start + 1);
|
||||
max_len = min_t(unsigned long long, max_len, i_size - start);
|
||||
|
||||
if (len < max_len)
|
||||
netfs_extend_writeback(mapping, group, xas, &count, start,
|
||||
max_len, caching, &len, &wreq->upper_len);
|
||||
}
|
||||
|
||||
cant_expand:
|
||||
len = min_t(unsigned long long, len, i_size - start);
|
||||
|
||||
/* We now have a contiguous set of dirty pages, each with writeback
|
||||
* set; the first page is still locked at this point, but all the rest
|
||||
* have been unlocked.
|
||||
*/
|
||||
folio_unlock(folio);
|
||||
wreq->start = start;
|
||||
wreq->len = len;
|
||||
|
||||
if (start < i_size) {
|
||||
_debug("write back %zx @%llx [%llx]", len, start, i_size);
|
||||
|
||||
/* Speculatively write to the cache. We have to fix this up
|
||||
* later if the store fails.
|
||||
*/
|
||||
wreq->cleanup = netfs_cleanup_buffered_write;
|
||||
|
||||
iov_iter_xarray(&wreq->iter, ITER_SOURCE, &mapping->i_pages, start,
|
||||
wreq->upper_len);
|
||||
__set_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags);
|
||||
ret = netfs_begin_write(wreq, true, netfs_write_trace_writeback);
|
||||
if (ret == 0 || ret == -EIOCBQUEUED)
|
||||
wbc->nr_to_write -= len / PAGE_SIZE;
|
||||
} else {
|
||||
_debug("write discard %zx @%llx [%llx]", len, start, i_size);
|
||||
|
||||
/* The dirty region was entirely beyond the EOF. */
|
||||
fscache_clear_page_bits(mapping, start, len, caching);
|
||||
netfs_pages_written_back(wreq);
|
||||
ret = 0;
|
||||
}
|
||||
|
||||
netfs_put_request(wreq, false, netfs_rreq_trace_put_return);
|
||||
_leave(" = 1");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Write a region of pages back to the server
|
||||
*/
|
||||
static ssize_t netfs_writepages_begin(struct address_space *mapping,
|
||||
struct writeback_control *wbc,
|
||||
struct netfs_group *group,
|
||||
struct xa_state *xas,
|
||||
unsigned long long *_start,
|
||||
unsigned long long end)
|
||||
{
|
||||
const struct netfs_folio *finfo;
|
||||
struct folio *folio;
|
||||
unsigned long long start = *_start;
|
||||
ssize_t ret;
|
||||
void *priv;
|
||||
int skips = 0;
|
||||
|
||||
_enter("%llx,%llx,", start, end);
|
||||
|
||||
search_again:
|
||||
/* Find the first dirty page in the group. */
|
||||
rcu_read_lock();
|
||||
|
||||
for (;;) {
|
||||
folio = xas_find_marked(xas, end / PAGE_SIZE, PAGECACHE_TAG_DIRTY);
|
||||
if (xas_retry(xas, folio) || xa_is_value(folio))
|
||||
continue;
|
||||
if (!folio)
|
||||
break;
|
||||
|
||||
if (!folio_try_get_rcu(folio)) {
|
||||
xas_reset(xas);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (unlikely(folio != xas_reload(xas))) {
|
||||
folio_put(folio);
|
||||
xas_reset(xas);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Skip any dirty folio that's not in the group of interest. */
|
||||
priv = folio_get_private(folio);
|
||||
if ((const struct netfs_group *)priv != group) {
|
||||
finfo = netfs_folio_info(folio);
|
||||
if (finfo->netfs_group != group) {
|
||||
folio_put(folio);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
xas_pause(xas);
|
||||
break;
|
||||
}
|
||||
rcu_read_unlock();
|
||||
if (!folio)
|
||||
return 0;
|
||||
|
||||
start = folio_pos(folio); /* May regress with THPs */
|
||||
|
||||
_debug("wback %lx", folio_index(folio));
|
||||
|
||||
/* At this point we hold neither the i_pages lock nor the page lock:
|
||||
* the page may be truncated or invalidated (changing page->mapping to
|
||||
* NULL), or even swizzled back from swapper_space to tmpfs file
|
||||
* mapping
|
||||
*/
|
||||
lock_again:
|
||||
if (wbc->sync_mode != WB_SYNC_NONE) {
|
||||
ret = folio_lock_killable(folio);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
} else {
|
||||
if (!folio_trylock(folio))
|
||||
goto search_again;
|
||||
}
|
||||
|
||||
if (folio->mapping != mapping ||
|
||||
!folio_test_dirty(folio)) {
|
||||
start += folio_size(folio);
|
||||
folio_unlock(folio);
|
||||
goto search_again;
|
||||
}
|
||||
|
||||
if (folio_test_writeback(folio) ||
|
||||
folio_test_fscache(folio)) {
|
||||
folio_unlock(folio);
|
||||
if (wbc->sync_mode != WB_SYNC_NONE) {
|
||||
folio_wait_writeback(folio);
|
||||
#ifdef CONFIG_NETFS_FSCACHE
|
||||
folio_wait_fscache(folio);
|
||||
#endif
|
||||
goto lock_again;
|
||||
}
|
||||
|
||||
start += folio_size(folio);
|
||||
if (wbc->sync_mode == WB_SYNC_NONE) {
|
||||
if (skips >= 5 || need_resched()) {
|
||||
ret = 0;
|
||||
goto out;
|
||||
}
|
||||
skips++;
|
||||
}
|
||||
goto search_again;
|
||||
}
|
||||
|
||||
ret = netfs_write_back_from_locked_folio(mapping, wbc, group, xas,
|
||||
folio, start, end);
|
||||
out:
|
||||
if (ret > 0)
|
||||
*_start = start + ret;
|
||||
_leave(" = %zd [%llx]", ret, *_start);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Write a region of pages back to the server
|
||||
*/
|
||||
static int netfs_writepages_region(struct address_space *mapping,
|
||||
struct writeback_control *wbc,
|
||||
struct netfs_group *group,
|
||||
unsigned long long *_start,
|
||||
unsigned long long end)
|
||||
{
|
||||
ssize_t ret;
|
||||
|
||||
XA_STATE(xas, &mapping->i_pages, *_start / PAGE_SIZE);
|
||||
|
||||
do {
|
||||
ret = netfs_writepages_begin(mapping, wbc, group, &xas,
|
||||
_start, end);
|
||||
if (ret > 0 && wbc->nr_to_write > 0)
|
||||
cond_resched();
|
||||
} while (ret > 0 && wbc->nr_to_write > 0);
|
||||
|
||||
return ret > 0 ? 0 : ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* write some of the pending data back to the server
|
||||
*/
|
||||
int netfs_writepages(struct address_space *mapping,
|
||||
struct writeback_control *wbc)
|
||||
{
|
||||
struct netfs_group *group = NULL;
|
||||
loff_t start, end;
|
||||
int ret;
|
||||
|
||||
_enter("");
|
||||
|
||||
/* We have to be careful as we can end up racing with setattr()
|
||||
* truncating the pagecache since the caller doesn't take a lock here
|
||||
* to prevent it.
|
||||
*/
|
||||
|
||||
if (wbc->range_cyclic && mapping->writeback_index) {
|
||||
start = mapping->writeback_index * PAGE_SIZE;
|
||||
ret = netfs_writepages_region(mapping, wbc, group,
|
||||
&start, LLONG_MAX);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
if (wbc->nr_to_write <= 0) {
|
||||
mapping->writeback_index = start / PAGE_SIZE;
|
||||
goto out;
|
||||
}
|
||||
|
||||
start = 0;
|
||||
end = mapping->writeback_index * PAGE_SIZE;
|
||||
mapping->writeback_index = 0;
|
||||
ret = netfs_writepages_region(mapping, wbc, group, &start, end);
|
||||
if (ret == 0)
|
||||
mapping->writeback_index = start / PAGE_SIZE;
|
||||
} else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) {
|
||||
start = 0;
|
||||
ret = netfs_writepages_region(mapping, wbc, group,
|
||||
&start, LLONG_MAX);
|
||||
if (wbc->nr_to_write > 0 && ret == 0)
|
||||
mapping->writeback_index = start / PAGE_SIZE;
|
||||
} else {
|
||||
start = wbc->range_start;
|
||||
ret = netfs_writepages_region(mapping, wbc, group,
|
||||
&start, wbc->range_end);
|
||||
}
|
||||
|
||||
out:
|
||||
_leave(" = %d", ret);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(netfs_writepages);
|
||||
|
|
|
|||
|
|
@ -397,6 +397,8 @@ int netfs_read_folio(struct file *, struct folio *);
|
|||
int netfs_write_begin(struct netfs_inode *, struct file *,
|
||||
struct address_space *, loff_t pos, unsigned int len,
|
||||
struct folio **, void **fsdata);
|
||||
int netfs_writepages(struct address_space *mapping,
|
||||
struct writeback_control *wbc);
|
||||
bool netfs_dirty_folio(struct address_space *mapping, struct folio *folio);
|
||||
int netfs_unpin_writeback(struct inode *inode, struct writeback_control *wbc);
|
||||
void netfs_clear_inode_writeback(struct inode *inode, const void *aux);
|
||||
|
|
|
|||
Loading…
Reference in New Issue