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afs: Stop implementing ->writepage()
We're trying to get rid of the ->writepage() hook[1]. Stop afs from using it by unlocking the page and calling afs_writepages_region() rather than folio_write_one(). A flag is passed to afs_writepages_region() to indicate that it should only write a single region so that we don't flush the entire file in ->write_begin(), but do add other dirty data to the region being written to try and reduce the number of RPC ops. This requires ->migrate_folio() to be implemented, so point that at filemap_migrate_folio() for files and also for symlinks and directories. This can be tested by turning on the afs_folio_dirty tracepoint and then doing something like: xfs_io -c "w 2223 7000" -c "w 15000 22222" -c "w 23 7" /afs/my/test/foo and then looking in the trace to see if the write at position 15000 gets stored before page 0 gets dirtied for the write at position 23. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: Christoph Hellwig <hch@lst.de> cc: Matthew Wilcox <willy@infradead.org> cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/20221113162902.883850-1-hch@lst.de/ [1] Link: https://lore.kernel.org/r/166876785552.222254.4403222906022558715.stgit@warthog.procyon.org.uk/ # v1
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@ -77,6 +77,7 @@ const struct address_space_operations afs_dir_aops = {
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.dirty_folio = afs_dir_dirty_folio,
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.release_folio = afs_dir_release_folio,
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.invalidate_folio = afs_dir_invalidate_folio,
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.migrate_folio = filemap_migrate_folio,
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};
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const struct dentry_operations afs_fs_dentry_operations = {
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@ -58,14 +58,15 @@ const struct address_space_operations afs_file_aops = {
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.invalidate_folio = afs_invalidate_folio,
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.write_begin = afs_write_begin,
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.write_end = afs_write_end,
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.writepage = afs_writepage,
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.writepages = afs_writepages,
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.migrate_folio = filemap_migrate_folio,
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};
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const struct address_space_operations afs_symlink_aops = {
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.read_folio = afs_symlink_read_folio,
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.release_folio = afs_release_folio,
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.invalidate_folio = afs_invalidate_folio,
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.migrate_folio = filemap_migrate_folio,
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};
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static const struct vm_operations_struct afs_vm_ops = {
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@ -14,6 +14,11 @@
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#include <linux/netfs.h>
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#include "internal.h"
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static int afs_writepages_region(struct address_space *mapping,
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struct writeback_control *wbc,
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loff_t start, loff_t end, loff_t *_next,
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bool max_one_loop);
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static void afs_write_to_cache(struct afs_vnode *vnode, loff_t start, size_t len,
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loff_t i_size, bool caching);
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@ -38,6 +43,25 @@ static void afs_folio_start_fscache(bool caching, struct folio *folio)
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}
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#endif
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/*
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* Flush out a conflicting write. This may extend the write to the surrounding
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* pages if also dirty and contiguous to the conflicting region..
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*/
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static int afs_flush_conflicting_write(struct address_space *mapping,
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struct folio *folio)
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{
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struct writeback_control wbc = {
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.sync_mode = WB_SYNC_ALL,
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.nr_to_write = LONG_MAX,
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.range_start = folio_pos(folio),
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.range_end = LLONG_MAX,
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};
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loff_t next;
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return afs_writepages_region(mapping, &wbc, folio_pos(folio), LLONG_MAX,
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&next, true);
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}
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/*
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* prepare to perform part of a write to a page
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*/
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@ -80,7 +104,8 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
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if (folio_test_writeback(folio)) {
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trace_afs_folio_dirty(vnode, tracepoint_string("alrdy"), folio);
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goto flush_conflicting_write;
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folio_unlock(folio);
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goto wait_for_writeback;
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}
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/* If the file is being filled locally, allow inter-write
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* spaces to be merged into writes. If it's not, only write
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@ -99,8 +124,15 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
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* flush the page out.
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*/
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flush_conflicting_write:
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_debug("flush conflict");
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ret = folio_write_one(folio);
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trace_afs_folio_dirty(vnode, tracepoint_string("confl"), folio);
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folio_unlock(folio);
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ret = afs_flush_conflicting_write(mapping, folio);
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if (ret < 0)
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goto error;
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wait_for_writeback:
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ret = folio_wait_writeback_killable(folio);
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if (ret < 0)
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goto error;
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@ -663,40 +695,13 @@ static ssize_t afs_write_back_from_locked_folio(struct address_space *mapping,
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return ret;
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}
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/*
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* write a page back to the server
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* - the caller locked the page for us
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*/
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int afs_writepage(struct page *subpage, struct writeback_control *wbc)
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{
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struct folio *folio = page_folio(subpage);
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ssize_t ret;
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loff_t start;
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_enter("{%lx},", folio_index(folio));
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#ifdef CONFIG_AFS_FSCACHE
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folio_wait_fscache(folio);
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#endif
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start = folio_index(folio) * PAGE_SIZE;
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ret = afs_write_back_from_locked_folio(folio_mapping(folio), wbc,
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folio, start, LLONG_MAX - start);
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if (ret < 0) {
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_leave(" = %zd", ret);
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return ret;
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}
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_leave(" = 0");
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return 0;
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}
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/*
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* write a region of pages back to the server
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*/
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static int afs_writepages_region(struct address_space *mapping,
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struct writeback_control *wbc,
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loff_t start, loff_t end, loff_t *_next)
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loff_t start, loff_t end, loff_t *_next,
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bool max_one_loop)
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{
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struct folio *folio;
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struct page *head_page;
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@ -775,6 +780,9 @@ static int afs_writepages_region(struct address_space *mapping,
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start += ret;
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if (max_one_loop)
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break;
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cond_resched();
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} while (wbc->nr_to_write > 0);
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@ -806,24 +814,27 @@ int afs_writepages(struct address_space *mapping,
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if (wbc->range_cyclic) {
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start = mapping->writeback_index * PAGE_SIZE;
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ret = afs_writepages_region(mapping, wbc, start, LLONG_MAX, &next);
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ret = afs_writepages_region(mapping, wbc, start, LLONG_MAX,
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&next, false);
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if (ret == 0) {
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mapping->writeback_index = next / PAGE_SIZE;
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if (start > 0 && wbc->nr_to_write > 0) {
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ret = afs_writepages_region(mapping, wbc, 0,
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start, &next);
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start, &next, false);
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if (ret == 0)
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mapping->writeback_index =
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next / PAGE_SIZE;
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}
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}
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} else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) {
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ret = afs_writepages_region(mapping, wbc, 0, LLONG_MAX, &next);
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ret = afs_writepages_region(mapping, wbc, 0, LLONG_MAX,
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&next, false);
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if (wbc->nr_to_write > 0 && ret == 0)
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mapping->writeback_index = next / PAGE_SIZE;
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} else {
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ret = afs_writepages_region(mapping, wbc,
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wbc->range_start, wbc->range_end, &next);
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wbc->range_start, wbc->range_end,
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&next, false);
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}
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up_read(&vnode->validate_lock);
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