From: email@example.com To: firstname.lastname@example.org Cc: Ira Weiny <email@example.com>, Alexander Viro <firstname.lastname@example.org>, "Darrick J. Wong" <email@example.com>, Dan Williams <firstname.lastname@example.org>, Dave Chinner <email@example.com>, Christoph Hellwig <firstname.lastname@example.org>, "Theodore Y. Ts'o" <email@example.com>, Jan Kara <firstname.lastname@example.org>, email@example.com, firstname.lastname@example.org, email@example.com Subject: [PATCH V5 00/12] Enable per-file/per-directory DAX operations V5 Date: Wed, 26 Feb 2020 21:24:30 -0800 [thread overview] Message-ID: <firstname.lastname@example.org> (raw) From: Ira Weiny <email@example.com> Changes from V4: * Open code the aops lock rather than add it to the xfs_ilock() subsystem (Darrick's comments were obsoleted by this change) * Fix lkp build suggestions and bugs Changes from V3: * Remove global locking... :-D * put back per inode locking and remove pre-mature optimizations * Fix issues with Directories having IS_DAX() set * Fix kernel crash issues reported by Jeff * Add some clean up patches * Consolidate diflags to iflags functions * Update/add documentation * Reorder/rename patches quite a bit Changes from V2: * Move i_dax_sem to be a global percpu_rw_sem rather than per inode Internal discussions with Dan determined this would be easier, just as performant, and slightly less overhead that having it in the SB as suggested by Jan * Fix locking order in comments and throughout code * Change "mode" to "state" throughout commits * Add CONFIG_FS_DAX wrapper to disable inode_[un]lock_state() when not configured * Add static branch for which is activated by a device which supports DAX in XFS * Change "lock/unlock" to up/down read/write as appropriate Previous names were over simplified * Update comments/documentation * Remove the xfs specific lock to the vfs (global) layer. * Fix i_dax_sem locking order and comments * Move 'i_mapped' count from struct inode to struct address_space and rename it to mmap_count * Add inode_has_mappings() call * Fix build issues * Clean up syntax spacing and minor issues * Update man page text for STATX_ATTR_DAX * Add reviewed-by's * Rebase to 5.6 Rename patch: from: fs/xfs: Add lock/unlock state to xfs to: fs/xfs: Add write DAX lock to xfs layer Add patch: fs/xfs: Clarify lockdep dependency for xfs_isilocked() Drop patch: fs/xfs: Fix truncate up At LSF/MM'19   we discussed applications that overestimate memory consumption due to their inability to detect whether the kernel will instantiate page cache for a file, and cases where a global dax enable via a mount option is too coarse. The following patch series enables selecting the use of DAX on individual files and/or directories on xfs, and lays some groundwork to do so in ext4. In this scheme the dax mount option can be omitted to allow the per-file property to take effect. The insight at LSF/MM was to separate the per-mount or per-file "physical" capability switch from an "effective" attribute for the file. At LSF/MM we discussed the difficulties of switching the DAX state of a file with active mappings / page cache. It was thought the races could be avoided by limiting DAX state flips to 0-length files. However, this turns out to not be true. This is because address space operations (a_ops) may be in use at any time the inode is referenced and users have expressed a desire to be able to change the DAX state on a file with data in it. For those reasons this patch set allows changing the DAX state flag on a file as long as it is not current mapped. Details of when and how DAX state can be changed on a file is included in a documentation patch. It should be noted that the physical DAX flag inheritance is not shown in this patch set as it was maintained from previous work on XFS. The physical DAX flag and it's inheritance will need to be added to other file systems for user control. As submitted this works on real hardware testing.  https://lwn.net/Articles/787973/  https://lwn.net/Articles/787233/  https://lkml.org/lkml/2019/10/20/96  https://patchwork.kernel.org/patch/11310511/ To: firstname.lastname@example.org Cc: Alexander Viro <email@example.com> Cc: "Darrick J. Wong" <firstname.lastname@example.org> Cc: Dan Williams <email@example.com> Cc: Dave Chinner <firstname.lastname@example.org> Cc: Christoph Hellwig <email@example.com> Cc: "Theodore Y. Ts'o" <firstname.lastname@example.org> Cc: Jan Kara <email@example.com> Cc: firstname.lastname@example.org Cc: email@example.com Cc: firstname.lastname@example.org Ira Weiny (12): fs/xfs: Remove unnecessary initialization of i_rwsem fs: Remove unneeded IS_DAX() check fs/stat: Define DAX statx attribute fs/xfs: Isolate the physical DAX flag from enabled fs/xfs: Create function xfs_inode_enable_dax() fs: Add locking for a dynamic address space operations state fs: Prevent DAX state change if file is mmap'ed fs/xfs: Hold off aops users while changing DAX state fs/xfs: Clean up locking in dax invalidate fs/xfs: Allow toggle of effective DAX flag fs/xfs: Remove xfs_diflags_to_linux() Documentation/dax: Update Usage section Documentation/filesystems/dax.txt | 84 +++++++++++++++++++++++++- Documentation/filesystems/vfs.rst | 16 +++++ fs/attr.c | 1 + fs/inode.c | 16 ++++- fs/iomap/buffered-io.c | 1 + fs/open.c | 4 ++ fs/stat.c | 5 ++ fs/xfs/xfs_icache.c | 5 +- fs/xfs/xfs_inode.h | 2 + fs/xfs/xfs_ioctl.c | 98 +++++++++++++++---------------- fs/xfs/xfs_iops.c | 69 +++++++++++++++------- include/linux/fs.h | 73 ++++++++++++++++++++++- include/uapi/linux/stat.h | 1 + mm/fadvise.c | 7 ++- mm/filemap.c | 4 ++ mm/huge_memory.c | 1 + mm/khugepaged.c | 2 + mm/mmap.c | 19 +++++- mm/util.c | 9 ++- 19 files changed, 328 insertions(+), 89 deletions(-) -- 2.21.0
next reply other threads:[~2020-02-27 5:32 UTC|newest] Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-27 5:24 ira.weiny [this message] 2020-02-27 5:24 ` [PATCH V5 01/12] fs/xfs: Remove unnecessary initialization of i_rwsem ira.weiny 2020-02-27 17:25 ` Ira Weiny 2020-02-27 5:24 ` [PATCH V5 02/12] fs: Remove unneeded IS_DAX() check ira.weiny 2020-02-27 5:24 ` [PATCH V5 03/12] fs/stat: Define DAX statx attribute ira.weiny 2020-02-27 5:24 ` [PATCH V5 04/12] fs/xfs: Isolate the physical DAX flag from enabled ira.weiny 2020-02-27 5:24 ` [PATCH V5 05/12] fs/xfs: Create function xfs_inode_enable_dax() ira.weiny 2020-03-01 22:37 ` Dave Chinner 2020-02-27 5:24 ` [PATCH V5 06/12] fs: Add locking for a dynamic address space operations state ira.weiny 2020-03-02 1:26 ` Dave Chinner 2020-03-02 1:36 ` Dave Chinner 2020-02-27 5:24 ` [PATCH V5 07/12] fs: Prevent DAX state change if file is mmap'ed ira.weiny 2020-02-27 5:24 ` [PATCH V5 08/12] fs/xfs: Hold off aops users while changing DAX state ira.weiny 2020-02-27 5:24 ` [PATCH V5 09/12] fs/xfs: Clean up locking in dax invalidate ira.weiny 2020-02-27 5:24 ` [PATCH V5 10/12] fs/xfs: Allow toggle of effective DAX flag ira.weiny 2020-02-27 5:24 ` [PATCH V5 11/12] fs/xfs: Remove xfs_diflags_to_linux() ira.weiny 2020-02-27 5:24 ` [PATCH V5 12/12] Documentation/dax: Update Usage section ira.weiny 2020-03-05 15:51 ` [PATCH V5 00/12] Enable per-file/per-directory DAX operations V5 Christoph Hellwig 2020-03-09 17:04 ` Ira Weiny 2020-03-11 3:36 ` Darrick J. Wong 2020-03-11 6:29 ` Christoph Hellwig 2020-03-11 17:07 ` Dan Williams 2020-03-16 9:52 ` Jan Kara 2020-03-16 9:55 ` Christoph Hellwig 2020-04-01 4:00 ` Darrick J. Wong 2020-04-01 10:25 ` Jan Kara 2020-04-02 8:53 ` Christoph Hellwig 2020-04-02 20:55 ` Ira Weiny 2020-04-03 7:27 ` Christoph Hellwig 2020-04-03 15:48 ` Ira Weiny 2020-04-03 17:03 ` Jan Kara 2020-04-03 18:18 ` Ira Weiny 2020-04-03 18:21 ` Ira Weiny 2020-04-03 18:37 ` Darrick J. Wong 2020-04-05 6:19 ` Ira Weiny 2020-04-06 10:00 ` Jan Kara 2020-04-03 18:29 ` Darrick J. Wong 2020-04-03 16:05 ` Darrick J. Wong 2020-04-03 4:39 ` Ira Weiny 2020-03-11 6:39 ` Dave Chinner 2020-03-11 6:44 ` Christoph Hellwig 2020-03-11 17:07 ` Dan Williams 2020-03-12 0:49 ` Dave Chinner 2020-03-12 3:00 ` Darrick J. Wong 2020-03-12 7:27 ` Christoph Hellwig
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