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smtp.kernel.org (Postfix) with ESMTPSA id 97FF9C433C8; Wed, 13 Dec 2023 16:05:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1702483557; bh=kELEnVlcoDolhSWet6c+R6d2i2N//H1HAVNrhARH3fI=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=dK9rbljkcrgkshS77/YHsB8LELPQQvNPvJ8AiCpghYOCci9IcTg+MFm4E5Igim/86 xgHDV07N2j1miWILt99OlTmyUJkKzgcWfQykud9oF6ps9ndk6GPzI9ktazsuaJlP49 2XwYF5Bm6lCn9kF16srYYUamxfnrixSR4id+sbF520p12BqAMqR0SD1rE8zm85XeLt 9ofogqLsxnLWD6MpiO8UeyBUAPxOg8pUqBH2wW++/xydOfAVc2JnJLZB1iT/ASVH9v lkZzlxCrmTChXIjD12+yIgO5gjb0eFcgra5F10hw/Zn/pBanP/oN+UF2WsEtqvgguB AvfYSw9+x328Q== Message-ID: <987d3f0ac5cafc9706f5d532e60f9cc0379b3153.camel@kernel.org> Subject: Re: [PATCH v4 10/39] netfs: Provide invalidate_folio and release_folio calls From: Jeff Layton To: David Howells , Steve French Cc: Matthew Wilcox , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Dominique Martinet , Eric Van Hensbergen , Ilya Dryomov , 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 abzIgWVI 2c/UXPxFB89XQkYrMaxCqfWvhlMQW94Nh7fvQocB6lgXs8Tgz20oewY0JKws8d73AtR2/+Dje9xWdTcYkZQuz3Yo10ijyQDUGkIkN6MyV3E2NcUPsLqSAmA2/bo1vm2+GhQhp86fMQ3SKOtfLumBNByIMykdQjo5Uzyd7znZCvbL1Tuih0hw3XZTqVTtm8lXXjU55WN9uUbm90W5qwWEjZRAF1A1XPTZsb7hkix+9ZrYHT+xmFw42wH2sm60KfHYaW6PST73PzRYgna1wisXvAlMY5Ez5AHqeL73lpz2+GhvS5xBXlUBRsaUHuGPVFb1CeEIM3tRLby2PLpUKtfa4j/26CJPo+FAb1RuaHBfNtR+98PxfI1RLIQWj3Je6Bh7jUJcN X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 2023-12-13 at 15:23 +0000, David Howells wrote: > Provide default invalidate_folio and release_folio calls. These will nee= d > to interact with invalidation correctly at some point. They will be need= ed > if netfslib is to make use of folio->private for its own purposes. >=20 > Signed-off-by: David Howells > Reviewed-by: Jeff Layton > cc: linux-cachefs@redhat.com > cc: linux-fsdevel@vger.kernel.org > cc: linux-mm@kvack.org > --- > fs/9p/vfs_addr.c | 33 ++------------------------- > fs/afs/file.c | 53 ++++--------------------------------------- > fs/ceph/addr.c | 24 ++------------------ > fs/netfs/misc.c | 42 ++++++++++++++++++++++++++++++++++ > include/linux/netfs.h | 6 +++-- > 5 files changed, 54 insertions(+), 104 deletions(-) >=20 > diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c > index 131b83c31f85..055b672a247d 100644 > --- a/fs/9p/vfs_addr.c > +++ b/fs/9p/vfs_addr.c > @@ -88,35 +88,6 @@ const struct netfs_request_ops v9fs_req_ops =3D { > .issue_read =3D v9fs_issue_read, > }; > =20 > -/** > - * v9fs_release_folio - release the private state associated with a foli= o > - * @folio: The folio to be released > - * @gfp: The caller's allocation restrictions > - * > - * Returns true if the page can be released, false otherwise. > - */ > - > -static bool v9fs_release_folio(struct folio *folio, gfp_t gfp) > -{ > - if (folio_test_private(folio)) > - return false; > -#ifdef CONFIG_9P_FSCACHE > - if (folio_test_fscache(folio)) { > - if (current_is_kswapd() || !(gfp & __GFP_FS)) > - return false; > - folio_wait_fscache(folio); > - } > - fscache_note_page_release(v9fs_inode_cookie(V9FS_I(folio_inode(folio)))= ); > -#endif > - return true; > -} > - > -static void v9fs_invalidate_folio(struct folio *folio, size_t offset, > - size_t length) > -{ > - folio_wait_fscache(folio); > -} > - > #ifdef CONFIG_9P_FSCACHE > static void v9fs_write_to_cache_done(void *priv, ssize_t transferred_or_= error, > bool was_async) > @@ -324,8 +295,8 @@ const struct address_space_operations v9fs_addr_opera= tions =3D { > .writepage =3D v9fs_vfs_writepage, > .write_begin =3D v9fs_write_begin, > .write_end =3D v9fs_write_end, > - .release_folio =3D v9fs_release_folio, > - .invalidate_folio =3D v9fs_invalidate_folio, > + .release_folio =3D netfs_release_folio, > + .invalidate_folio =3D netfs_invalidate_folio, > .launder_folio =3D v9fs_launder_folio, > .direct_IO =3D v9fs_direct_IO, > }; > diff --git a/fs/afs/file.c b/fs/afs/file.c > index 5e2bca3b02fd..c5013ec3c1dc 100644 > --- a/fs/afs/file.c > +++ b/fs/afs/file.c > @@ -20,9 +20,6 @@ > =20 > static int afs_file_mmap(struct file *file, struct vm_area_struct *vma); > static int afs_symlink_read_folio(struct file *file, struct folio *folio= ); > -static void afs_invalidate_folio(struct folio *folio, size_t offset, > - size_t length); > -static bool afs_release_folio(struct folio *folio, gfp_t gfp_flags); > =20 > static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *i= ter); > static ssize_t afs_file_splice_read(struct file *in, loff_t *ppos, > @@ -57,8 +54,8 @@ const struct address_space_operations afs_file_aops =3D= { > .readahead =3D netfs_readahead, > .dirty_folio =3D netfs_dirty_folio, > .launder_folio =3D afs_launder_folio, > - .release_folio =3D afs_release_folio, > - .invalidate_folio =3D afs_invalidate_folio, > + .release_folio =3D netfs_release_folio, > + .invalidate_folio =3D netfs_invalidate_folio, > .write_begin =3D afs_write_begin, > .write_end =3D afs_write_end, > .writepages =3D afs_writepages, > @@ -67,8 +64,8 @@ const struct address_space_operations afs_file_aops =3D= { > =20 > const struct address_space_operations afs_symlink_aops =3D { > .read_folio =3D afs_symlink_read_folio, > - .release_folio =3D afs_release_folio, > - .invalidate_folio =3D afs_invalidate_folio, > + .release_folio =3D netfs_release_folio, > + .invalidate_folio =3D netfs_invalidate_folio, > .migrate_folio =3D filemap_migrate_folio, > }; > =20 > @@ -383,48 +380,6 @@ const struct netfs_request_ops afs_req_ops =3D { > .issue_read =3D afs_issue_read, > }; > =20 > -/* > - * invalidate part or all of a page > - * - release a page and clean up its private data if offset is 0 (indica= ting > - * the entire page) > - */ > -static void afs_invalidate_folio(struct folio *folio, size_t offset, > - size_t length) > -{ > - _enter("{%lu},%zu,%zu", folio->index, offset, length); > - > - folio_wait_fscache(folio); > - _leave(""); > -} > - > -/* > - * release a page and clean up its private state if it's not busy > - * - return true if the page can now be released, false if not > - */ > -static bool afs_release_folio(struct folio *folio, gfp_t gfp) > -{ > - struct afs_vnode *vnode =3D AFS_FS_I(folio_inode(folio)); > - > - _enter("{{%llx:%llu}[%lu],%lx},%x", > - vnode->fid.vid, vnode->fid.vnode, folio_index(folio), folio->fla= gs, > - gfp); > - > - /* deny if folio is being written to the cache and the caller hasn't > - * elected to wait */ > -#ifdef CONFIG_AFS_FSCACHE > - if (folio_test_fscache(folio)) { > - if (current_is_kswapd() || !(gfp & __GFP_FS)) > - return false; > - folio_wait_fscache(folio); > - } > - fscache_note_page_release(afs_vnode_cache(vnode)); > -#endif > - > - /* Indicate that the folio can be released */ > - _leave(" =3D T"); > - return true; > -} > - > static void afs_add_open_mmap(struct afs_vnode *vnode) > { > if (atomic_inc_return(&vnode->cb_nr_mmap) =3D=3D 1) { > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c > index 654f408a0aca..500a87b68a9a 100644 > --- a/fs/ceph/addr.c > +++ b/fs/ceph/addr.c > @@ -159,27 +159,7 @@ static void ceph_invalidate_folio(struct folio *foli= o, size_t offset, > ceph_put_snap_context(snapc); > } > =20 > - folio_wait_fscache(folio); > -} > - > -static bool ceph_release_folio(struct folio *folio, gfp_t gfp) > -{ > - struct inode *inode =3D folio->mapping->host; > - struct ceph_client *cl =3D ceph_inode_to_client(inode); > - > - doutc(cl, "%llx.%llx idx %lu (%sdirty)\n", ceph_vinop(inode), > - folio->index, folio_test_dirty(folio) ? "" : "not "); > - > - if (folio_test_private(folio)) > - return false; > - > - if (folio_test_fscache(folio)) { > - if (current_is_kswapd() || !(gfp & __GFP_FS)) > - return false; > - folio_wait_fscache(folio); > - } > - ceph_fscache_note_page_release(inode); I think this is the only call to ceph_fscache_note_page_release, so that can likely be removed as well. > - return true; > + netfs_invalidate_folio(folio, offset, length); > } > =20 > static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq) > @@ -1585,7 +1565,7 @@ const struct address_space_operations ceph_aops =3D= { > .write_end =3D ceph_write_end, > .dirty_folio =3D ceph_dirty_folio, > .invalidate_folio =3D ceph_invalidate_folio, > - .release_folio =3D ceph_release_folio, > + .release_folio =3D netfs_release_folio, > .direct_IO =3D noop_direct_IO, > }; > =20 > diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c > index 68baf55c47a4..d946d85764de 100644 > --- a/fs/netfs/misc.c > +++ b/fs/netfs/misc.c > @@ -84,3 +84,45 @@ void netfs_clear_inode_writeback(struct inode *inode, = const void *aux) > } > } > EXPORT_SYMBOL(netfs_clear_inode_writeback); > + > +/* > + * netfs_invalidate_folio - Invalidate or partially invalidate a folio > + * @folio: Folio proposed for release > + * @offset: Offset of the invalidated region > + * @length: Length of the invalidated region > + * > + * Invalidate part or all of a folio for a network filesystem. The foli= o will > + * be removed afterwards if the invalidated region covers the entire fol= io. > + */ > +void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t l= ength) > +{ > + _enter("{%lx},%zx,%zx", folio_index(folio), offset, length); > + > + folio_wait_fscache(folio); > +} > +EXPORT_SYMBOL(netfs_invalidate_folio); > + > +/** > + * netfs_release_folio - Try to release a folio > + * @folio: Folio proposed for release > + * @gfp: Flags qualifying the release > + * > + * Request release of a folio and clean up its private state if it's not= busy. > + * Returns true if the folio can now be released, false if not > + */ > +bool netfs_release_folio(struct folio *folio, gfp_t gfp) > +{ > + struct netfs_inode *ctx =3D netfs_inode(folio_inode(folio)); > + > + if (folio_test_private(folio)) > + return false; > + if (folio_test_fscache(folio)) { > + if (current_is_kswapd() || !(gfp & __GFP_FS)) > + return false; > + folio_wait_fscache(folio); > + } > + > + fscache_note_page_release(netfs_i_cookie(ctx)); > + return true; > +} > +EXPORT_SYMBOL(netfs_release_folio); > diff --git a/include/linux/netfs.h b/include/linux/netfs.h > index 06f57d9d09f6..8efbfd3b2820 100644 > --- a/include/linux/netfs.h > +++ b/include/linux/netfs.h > @@ -293,11 +293,13 @@ struct readahead_control; > void netfs_readahead(struct readahead_control *); > 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); > + struct address_space *, loff_t pos, unsigned int len, > + struct folio **, void **fsdata); > bool netfs_dirty_folio(struct address_space *mapping, struct folio *foli= o); > int netfs_unpin_writeback(struct inode *inode, struct writeback_control = *wbc); > void netfs_clear_inode_writeback(struct inode *inode, const void *aux); > +void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t l= ength); > +bool netfs_release_folio(struct folio *folio, gfp_t gfp); > =20 > void netfs_subreq_terminated(struct netfs_io_subrequest *, ssize_t, bool= ); > void netfs_get_subrequest(struct netfs_io_subrequest *subreq, >=20 --=20 Jeff Layton