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Tue, 17 Jun 2025 19:00:46 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id CFZsHl67UWjKOQAAD6G6ig (envelope-from ); Tue, 17 Jun 2025 19:00:46 +0000 Message-ID: <540449d2-e1fe-4736-bc40-b6922db0b1a4@suse.cz> Date: Tue, 17 Jun 2025 21:00:46 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 07/10] mm/filemap: introduce generic_file_*_mmap_prepare() helpers Content-Language: en-US To: Lorenzo Stoakes , Andrew Morton Cc: "Liam R . Howlett" , Jens Axboe , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Sterba , David Howells , Marc Dionne , Alexander Viro , Christian Brauner , Jan Kara , Benjamin LaHaise , Miklos Szeredi , Amir Goldstein , Kent Overstreet , "Tigran A . Aivazian" , Kees Cook , Chris Mason , Josef Bacik , Xiubo Li , Ilya Dryomov , Jan Harkes , coda@cs.cmu.edu, Tyler Hicks , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Namjae Jeon , Sungjong Seo , Yuezhang Mo , Theodore Ts'o , Andreas Dilger , Jaegeuk Kim , OGAWA Hirofumi , Viacheslav Dubeyko , John Paul Adrian Glaubitz , Yangtao Li , Richard Weinberger , Anton Ivanov , Johannes Berg , Mikulas Patocka , David Woodhouse , Dave Kleikamp , Trond Myklebust , Anna Schumaker , Ryusuke Konishi , Konstantin Komarov , Mark Fasheh , Joel Becker , Joseph Qi , Bob Copeland , Mike Marshall , Martin Brandenburg , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , Zhihao Cheng , Hans de Goede , Carlos Maiolino , Damien Le Moal , Naohiro Aota , Johannes Thumshirn , Dan Williams , Matthew Wilcox , Jann Horn , Pedro Falcato , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, v9fs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, linux-aio@kvack.org, linux-unionfs@vger.kernel.org, linux-bcachefs@vger.kernel.org, linux-mm@kvack.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, linux-karma-devel@lists.sourceforge.net, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev References: <30622c1f0b98c66840bc8c02668bda276a810b70.1750099179.git.lorenzo.stoakes@oracle.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <30622c1f0b98c66840bc8c02668bda276a810b70.1750099179.git.lorenzo.stoakes@oracle.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 0E9F64001B X-Stat-Signature: n7tirqqfmr1cnyrofe5c6yusc3883dy3 X-Rspam-User: X-HE-Tag: 1750186848-342874 X-HE-Meta: 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 El3RQm25 YeFq4SDpvrY8Ffx7M+5CLEcAEJxUsM1ZLgQmzKMN7hCTDvfDbBD5VXL13AoeQEGMEiI11vc/2mX/FyblZqQVPQdXGFw== 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 6/16/25 21:33, Lorenzo Stoakes wrote: > Since commit c84bf6dd2b83 ("mm: introduce new .mmap_prepare() file > callback"), the f_op->mmap() hook has been deprecated in favour of > f_op->mmap_prepare(). > > The generic mmap handlers are very simple, so we can very easily convert > these in advance of converting file systems which use them. > > This patch does so. > > Signed-off-by: Lorenzo Stoakes Acked-by: Vlastimil Babka > --- > include/linux/fs.h | 6 ++++-- > mm/filemap.c | 29 +++++++++++++++++++++++++++++ > 2 files changed, 33 insertions(+), 2 deletions(-) > > diff --git a/include/linux/fs.h b/include/linux/fs.h > index 7120f80255b3..65cffc445fcc 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -3395,8 +3395,10 @@ extern void inode_add_lru(struct inode *inode); > extern int sb_set_blocksize(struct super_block *, int); > extern int sb_min_blocksize(struct super_block *, int); > > -extern int generic_file_mmap(struct file *, struct vm_area_struct *); > -extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); > +int generic_file_mmap(struct file *, struct vm_area_struct *); > +int generic_file_mmap_prepare(struct vm_area_desc *desc); > +int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); > +int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc); > extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *); > int generic_write_checks_count(struct kiocb *iocb, loff_t *count); > extern int generic_write_check_limits(struct file *file, loff_t pos, > diff --git a/mm/filemap.c b/mm/filemap.c > index 93fbc2ef232a..e75608cbf420 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -3847,6 +3847,18 @@ int generic_file_mmap(struct file *file, struct vm_area_struct *vma) > return 0; > } > > +int generic_file_mmap_prepare(struct vm_area_desc *desc) > +{ > + struct file *file = desc->file; > + struct address_space *mapping = file->f_mapping; > + > + if (!mapping->a_ops->read_folio) > + return -ENOEXEC; > + file_accessed(file); > + desc->vm_ops = &generic_file_vm_ops; > + return 0; > +} > + > /* > * This is for filesystems which do not implement ->writepage. > */ > @@ -3856,6 +3868,13 @@ int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *vma) > return -EINVAL; > return generic_file_mmap(file, vma); > } > + > +int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc) > +{ > + if (is_shared_maywrite(desc->vm_flags)) > + return -EINVAL; > + return generic_file_mmap_prepare(desc); > +} > #else > vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) > { > @@ -3865,15 +3884,25 @@ int generic_file_mmap(struct file *file, struct vm_area_struct *vma) > { > return -ENOSYS; > } > +int generic_file_mmap_prepare(struct vm_area_desc *desc) > +{ > + return -ENOSYS; > +} > int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *vma) > { > return -ENOSYS; > } > +int generic_file_readonly_mmap_prepare(struct vm_area_desc *desc) > +{ > + return -ENOSYS; > +} > #endif /* CONFIG_MMU */ > > EXPORT_SYMBOL(filemap_page_mkwrite); > EXPORT_SYMBOL(generic_file_mmap); > +EXPORT_SYMBOL(generic_file_mmap_prepare); > EXPORT_SYMBOL(generic_file_readonly_mmap); > +EXPORT_SYMBOL(generic_file_readonly_mmap_prepare); > > static struct folio *do_read_cache_folio(struct address_space *mapping, > pgoff_t index, filler_t filler, struct file *file, gfp_t gfp)