- 11 Aug, 2023 7 commits
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Jeff Layton authored
Enable multigrain timestamps, which should ensure that there is an apparent change to the timestamp whenever it has been written after being actively observed via getattr. tmpfs only requires the FS_MGTIME flag. Reviewed-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Jeff Layton <jlayton@kernel.org> Message-Id: <20230807-mgctime-v7-10-d1dec143a704@kernel.org> Signed-off-by:
Christian Brauner <brauner@kernel.org>
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Jeff Layton authored
The VFS always uses coarse-grained timestamps when updating the ctime and mtime after a change. This has the benefit of allowing filesystems to optimize away a lot metadata updates, down to around 1 per jiffy, even when a file is under heavy writes. Unfortunately, this has always been an issue when we're exporting via NFSv3, which relies on timestamps to validate caches. A lot of changes can happen in a jiffy, so timestamps aren't sufficient to help the client decide to invalidate the cache. Even with NFSv4, a lot of exported filesystems don't properly support a change attribute and are subject to the same problems with timestamp granularity. Other applications have similar issues with timestamps (e.g backup applications). If we were to always use fine-grained timestamps, that would improve the situation, but that becomes rather expensive, as the underlying filesystem would have to log a lot more metadata updates. What we need is a way to only use fine-grained timestamps when they are being actively queried. POSIX generally mandates that when the the mtime changes, the ctime must also change. The kernel always stores normalized ctime values, so only the first 30 bits of the tv_nsec field are ever used. Use the 31st bit of the ctime tv_nsec field to indicate that something has queried the inode for the mtime or ctime. When this flag is set, on the next mtime or ctime update, the kernel will fetch a fine-grained timestamp instead of the usual coarse-grained one. Filesytems can opt into this behavior by setting the FS_MGTIME flag in the fstype. Filesystems that don't set this flag will continue to use coarse-grained timestamps. Later patches will convert individual filesystems to use the new infrastructure. Signed-off-by:
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Jeff Layton authored
Now that all of the update_time operations are prepared for it, we can drop the timespec64 argument from the update_time operation. Do that and remove it from some associated functions like inode_update_time and inode_needs_update_time. Signed-off-by:
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Jeff Layton authored
In later patches we're going to drop the "now" parameter from the update_time operation. Prepare XFS for this by reworking how it fetches timestamps and sets them in the inode. Ensure that we update the ctime even if only S_MTIME is set. Signed-off-by:
"Darrick J. Wong" <djwong@kernel.org> Reviewed-by:
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Jeff Layton authored
In later patches, we're going to drop the "now" parameter from the update_time operation. Fix fat_update_time to fetch its own timestamp. It turns out that this is easily done by just passing a NULL timestamp pointer to fat_truncate_time. Signed-off-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Reviewed-by:
Frank Sorenson <sorenson@redhat.com> Message-Id: <20230810-ctime-fat-v1-2-327598fd1de8@kernel.org> Signed-off-by:
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Jeff Layton authored
commit 6bb885ec (fat: add functions to update and truncate timestamps appropriately") added an update_time routine for fat. That patch added a section for handling the S_VERSION bit, even though FAT doesn't enable SB_I_VERSION and the S_VERSION bit will never be set when calling it. Remove the section for handling S_VERSION since it's effectively dead code, and will be problematic vs. future changes. Cc: Frank Sorenson <sorenson@redhat.com> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to drop the "now" parameter from the update_time operation. Prepare ubifs for this, by having it use the new inode_update_timestamps helper. Signed-off-by:
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- 09 Aug, 2023 4 commits
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Jeff Layton authored
In later patches, we're going to drop the "now" argument from the update_time operation. Have btrfs_update_time use the new inode_update_timestamps helper to fetch a new timestamp and update it properly. Signed-off-by:
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Jeff Layton authored
In future patches we're going to change how the ctime is updated to keep track of when it has been queried. The way that the update_time operation works (and a lot of its callers) make this difficult, since they grab a timestamp early and then pass it down to eventually be copied into the inode. All of the existing update_time callers pass in the result of current_time() in some fashion. Drop the "time" parameter from generic_update_time, and rework it to fetch its own timestamp. This change means that an update_time could fetch a different timestamp than was seen in inode_needs_update_time. update_time is only ever called with one of two flag combinations: Either S_ATIME is set, or S_MTIME|S_CTIME|S_VERSION are set. With this change we now treat the flags argument as an indicator that some value needed to be updated when last checked, rather than an indication to update specific timestamps. Rework the logic for updating the timestamps and put it in a new inode_update_timestamps helper that other update_time routines can use. S_ATIME is as treated as we always have, but if any of the other three are set, then we attempt to update all three. Also, some callers of generic_update_time need to know what timestamps were actually updated. Change it to return an S_* flag mask to indicate that and rework the callers to expect it. Signed-off-by:
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Jeff Layton authored
generic_fillattr just fills in the entire stat struct indiscriminately today, copying data from the inode. There is at least one attribute (STATX_CHANGE_COOKIE) that can have side effects when it is reported, and we're looking at adding more with the addition of multigrain timestamps. Add a request_mask argument to generic_fillattr and have most callers just pass in the value that is passed to getattr. Have other callers (e.g. ksmbd) just pass in STATX_BASIC_STATS. Also move the setting of STATX_CHANGE_COOKIE into generic_fillattr. Acked-by:
Joseph Qi <joseph.qi@linux.alibaba.com> Reviewed-by:
Xiubo Li <xiubli@redhat.com> Reviewed-by:
"Paulo Alcantara (SUSE)" <pc@manguebit.com> Reviewed-by:
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Jeff Layton authored
An inode with no superblock? Unpossible! Signed-off-by:
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- 24 Jul, 2023 29 commits
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Jeff Layton authored
While these aren't generally visible from userland, it's best to be consistent with timestamp handling. When adjusting the quota, update the mtime and ctime like we would with a write operation on any other inode, and avoid updating the atime which should only be done for reads. Signed-off-by:
Andreas Gruenbacher <agruenba@redhat.com> Message-Id: <20230713135249.153796-1-jlayton@kernel.org> Signed-off-by:
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Jeff Layton authored
Now that everything in-tree is converted to use the accessor functions, rename the i_ctime field in the inode to discourage direct access. Signed-off-by:
Damien Le Moal <dlemoal@kernel.org> Reviewed-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Acked-by:
Paul Moore <paul@paul-moore.com> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Acked-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Acked-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
Zhihao Cheng <chengzhihao1@huawei.com> Message-Id: <20230705190309.579783-76-jlayton@kernel.org> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
"Steven Rostedt (Google)" <rostedt@goodmis.org> Reviewed-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Acked-by:
Tom Talpey <tom@talpey.com> Reviewed-by:
Sergey Senozhatsky <senozhatsky@chromium.org> Signed-off-by:
Steve French <stfrench@microsoft.com> Message-Id: <20230705190309.579783-72-jlayton@kernel.org> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Acked-by:
Anders Larsen <al@alarsen.net> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Acked-by:
Kees Cook <keescook@chromium.org> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Acked-by:
Luis Chamberlain <mcgrof@kernel.org> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Reviewed-by:
Amir Goldstein <amir73il@gmail.com> Signed-off-by:
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Jeff Layton authored
In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by:
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