Disable use of the fscache I/O routined by the AFS filesystem. It's about to transition to passing iov_iters down and fscache is about to have its I/O path to use iov_iter, so all that needs to change.
Signed-off-by: David Howells <dhowe...@redhat.com> cc: linux-...@lists.infradead.org cc: linux-cach...@redhat.com cc: linux-fsde...@vger.kernel.org Link: https://lore.kernel.org/r/158861209824.340223.1864211542341758994.st...@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/159465768717.1376105.2229314852486665807.st...@warthog.procyon.org.uk/ Link: https://lore.kernel.org/r/160588457929.3465195.1730097418904945578.st...@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/161118143744.1232039.2727898205333669064.st...@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/161161039077.2537118.7986870854927176905.st...@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/161340403323.1303470.8159439948319423431.st...@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/161539547167.286939.3536238932531122332.st...@warthog.procyon.org.uk/ # v4 --- fs/afs/file.c | 199 ++++++++++---------------------------------------------- fs/afs/inode.c | 2 - fs/afs/write.c | 10 --- 3 files changed, 36 insertions(+), 175 deletions(-) diff --git a/fs/afs/file.c b/fs/afs/file.c index 85f5adf21aa0..6d43713fde01 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -203,24 +203,6 @@ void afs_put_read(struct afs_read *req) } } -#ifdef CONFIG_AFS_FSCACHE -/* - * deal with notification that a page was read from the cache - */ -static void afs_file_readpage_read_complete(struct page *page, - void *data, - int error) -{ - _enter("%p,%p,%d", page, data, error); - - /* if the read completes with an error, we just unlock the page and let - * the VM reissue the readpage */ - if (!error) - SetPageUptodate(page); - unlock_page(page); -} -#endif - static void afs_fetch_data_success(struct afs_operation *op) { struct afs_vnode *vnode = op->file[0].vnode; @@ -288,89 +270,46 @@ int afs_page_filler(void *data, struct page *page) if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) goto error; - /* is it cached? */ -#ifdef CONFIG_AFS_FSCACHE - ret = fscache_read_or_alloc_page(vnode->cache, - page, - afs_file_readpage_read_complete, - NULL, - GFP_KERNEL); -#else - ret = -ENOBUFS; -#endif - switch (ret) { - /* read BIO submitted (page in cache) */ - case 0: - break; - - /* page not yet cached */ - case -ENODATA: - _debug("cache said ENODATA"); - goto go_on; - - /* page will not be cached */ - case -ENOBUFS: - _debug("cache said ENOBUFS"); - - fallthrough; - default: - go_on: - req = kzalloc(struct_size(req, array, 1), GFP_KERNEL); - if (!req) - goto enomem; - - /* We request a full page. If the page is a partial one at the - * end of the file, the server will return a short read and the - * unmarshalling code will clear the unfilled space. - */ - refcount_set(&req->usage, 1); - req->pos = (loff_t)page->index << PAGE_SHIFT; - req->len = PAGE_SIZE; - req->nr_pages = 1; - req->pages = req->array; - req->pages[0] = page; - get_page(page); - - /* read the contents of the file from the server into the - * page */ - ret = afs_fetch_data(vnode, key, req); - afs_put_read(req); - - if (ret < 0) { - if (ret == -ENOENT) { - _debug("got NOENT from server" - " - marking file deleted and stale"); - set_bit(AFS_VNODE_DELETED, &vnode->flags); - ret = -ESTALE; - } - -#ifdef CONFIG_AFS_FSCACHE - fscache_uncache_page(vnode->cache, page); -#endif - BUG_ON(PageFsCache(page)); - - if (ret == -EINTR || - ret == -ENOMEM || - ret == -ERESTARTSYS || - ret == -EAGAIN) - goto error; - goto io_error; - } + req = kzalloc(struct_size(req, array, 1), GFP_KERNEL); + if (!req) + goto enomem; - SetPageUptodate(page); + /* We request a full page. If the page is a partial one at the + * end of the file, the server will return a short read and the + * unmarshalling code will clear the unfilled space. + */ + refcount_set(&req->usage, 1); + req->pos = (loff_t)page->index << PAGE_SHIFT; + req->len = PAGE_SIZE; + req->nr_pages = 1; + req->pages = req->array; + req->pages[0] = page; + get_page(page); + + /* read the contents of the file from the server into the + * page */ + ret = afs_fetch_data(vnode, key, req); + afs_put_read(req); - /* send the page to the cache */ -#ifdef CONFIG_AFS_FSCACHE - if (PageFsCache(page) && - fscache_write_page(vnode->cache, page, vnode->status.size, - GFP_KERNEL) != 0) { - fscache_uncache_page(vnode->cache, page); - BUG_ON(PageFsCache(page)); + if (ret < 0) { + if (ret == -ENOENT) { + _debug("got NOENT from server" + " - marking file deleted and stale"); + set_bit(AFS_VNODE_DELETED, &vnode->flags); + ret = -ESTALE; } -#endif - unlock_page(page); + + if (ret == -EINTR || + ret == -ENOMEM || + ret == -ERESTARTSYS || + ret == -EAGAIN) + goto error; + goto io_error; } + SetPageUptodate(page); + unlock_page(page); + _leave(" = 0"); return 0; @@ -416,23 +355,10 @@ static int afs_readpage(struct file *file, struct page *page) */ static void afs_readpages_page_done(struct afs_read *req) { -#ifdef CONFIG_AFS_FSCACHE - struct afs_vnode *vnode = req->vnode; -#endif struct page *page = req->pages[req->index]; req->pages[req->index] = NULL; SetPageUptodate(page); - - /* send the page to the cache */ -#ifdef CONFIG_AFS_FSCACHE - if (PageFsCache(page) && - fscache_write_page(vnode->cache, page, vnode->status.size, - GFP_KERNEL) != 0) { - fscache_uncache_page(vnode->cache, page); - BUG_ON(PageFsCache(page)); - } -#endif unlock_page(page); put_page(page); } @@ -491,9 +417,6 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping, index = page->index; if (add_to_page_cache_lru(page, mapping, index, readahead_gfp_mask(mapping))) { -#ifdef CONFIG_AFS_FSCACHE - fscache_uncache_page(vnode->cache, page); -#endif put_page(page); break; } @@ -526,9 +449,6 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping, for (i = 0; i < req->nr_pages; i++) { page = req->pages[i]; if (page) { -#ifdef CONFIG_AFS_FSCACHE - fscache_uncache_page(vnode->cache, page); -#endif SetPageError(page); unlock_page(page); } @@ -560,37 +480,6 @@ static int afs_readpages(struct file *file, struct address_space *mapping, } /* attempt to read as many of the pages as possible */ -#ifdef CONFIG_AFS_FSCACHE - ret = fscache_read_or_alloc_pages(vnode->cache, - mapping, - pages, - &nr_pages, - afs_file_readpage_read_complete, - NULL, - mapping_gfp_mask(mapping)); -#else - ret = -ENOBUFS; -#endif - - switch (ret) { - /* all pages are being read from the cache */ - case 0: - BUG_ON(!list_empty(pages)); - BUG_ON(nr_pages != 0); - _leave(" = 0 [reading all]"); - return 0; - - /* there were pages that couldn't be read from the cache */ - case -ENODATA: - case -ENOBUFS: - break; - - /* other error */ - default: - _leave(" = %d", ret); - return ret; - } - while (!list_empty(pages)) { ret = afs_readpages_one(file, mapping, pages); if (ret < 0) @@ -670,17 +559,6 @@ static void afs_invalidatepage(struct page *page, unsigned int offset, BUG_ON(!PageLocked(page)); -#ifdef CONFIG_AFS_FSCACHE - /* we clean up only if the entire page is being invalidated */ - if (offset == 0 && length == PAGE_SIZE) { - if (PageFsCache(page)) { - struct afs_vnode *vnode = AFS_FS_I(page->mapping->host); - fscache_wait_on_page_write(vnode->cache, page); - fscache_uncache_page(vnode->cache, page); - } - } -#endif - if (PagePrivate(page)) afs_invalidate_dirty(page, offset, length); @@ -702,13 +580,6 @@ static int afs_releasepage(struct page *page, gfp_t gfp_flags) /* deny if page is being written to the cache and the caller hasn't * elected to wait */ -#ifdef CONFIG_AFS_FSCACHE - if (!fscache_maybe_release_page(vnode->cache, page, gfp_flags)) { - _leave(" = F [cache busy]"); - return 0; - } -#endif - if (PagePrivate(page)) { priv = (unsigned long)detach_page_private(page); trace_afs_page_dirty(vnode, tracepoint_string("rel"), diff --git a/fs/afs/inode.c b/fs/afs/inode.c index 1156b2df28d3..48519ee00eef 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -428,7 +428,7 @@ static void afs_get_inode_cache(struct afs_vnode *vnode) } __packed key; struct afs_vnode_cache_aux aux; - if (vnode->status.type == AFS_FTYPE_DIR) { + if (vnode->status.type != AFS_FTYPE_FILE) { vnode->cache = NULL; return; } diff --git a/fs/afs/write.c b/fs/afs/write.c index c9195fc67fd8..92eaa88000d7 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -847,9 +847,6 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) /* Wait for the page to be written to the cache before we allow it to * be modified. We then assume the entire page will need writing back. */ -#ifdef CONFIG_AFS_FSCACHE - fscache_wait_on_page_write(vnode->cache, vmf->page); -#endif if (PageWriteback(vmf->page) && wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) @@ -936,12 +933,5 @@ int afs_launder_page(struct page *page) priv = (unsigned long)detach_page_private(page); trace_afs_page_dirty(vnode, tracepoint_string("laundered"), page->index, priv); - -#ifdef CONFIG_AFS_FSCACHE - if (PageFsCache(page)) { - fscache_wait_on_page_write(vnode->cache, page); - fscache_uncache_page(vnode->cache, page); - } -#endif return ret; }
