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fs: add a ->sync_lazytime method

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Allow the file system to explicitly implement lazytime syncing instead
of pigging back on generic inode dirtying.  This allows to simplify
the XFS implementation and prepares for non-blocking lazytime timestamp
updates.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260108141934.2052404-8-hch@lst.de
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christoph Hellwig
2026-01-08 15:19:07 +01:00
committed by Christian Brauner
parent 188344c8ac
commit 5cf06ea56e
4 changed files with 20 additions and 2 deletions
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2
Documentation/filesystems/locking.rst
View File

@@ -82,6 +82,7 @@ prototypes::
int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, u64 len);
void (*update_time)(struct inode *inode, enum fs_update_time type,
int flags);
void (*sync_lazytime)(struct inode *inode);
int (*atomic_open)(struct inode *, struct dentry *,
struct file *, unsigned open_flag,
umode_t create_mode);
@@ -118,6 +119,7 @@ getattr: no
listxattr: no
fiemap: no
update_time: no
sync_lazytime: no
atomic_open: shared (exclusive if O_CREAT is set in open flags)
tmpfile: no
fileattr_get: no or exclusive

6
Documentation/filesystems/vfs.rst
View File

@@ -487,6 +487,7 @@ As of kernel 2.6.22, the following members are defined:
ssize_t (*listxattr) (struct dentry *, char *, size_t);
void (*update_time)(struct inode *inode, enum fs_update_time type,
int flags);
void (*sync_lazytime)(struct inode *inode);
int (*atomic_open)(struct inode *, struct dentry *, struct file *,
unsigned open_flag, umode_t create_mode);
int (*tmpfile) (struct mnt_idmap *, struct inode *, struct file *, umode_t);
@@ -643,6 +644,11 @@ otherwise noted.
an inode. If this is not defined the VFS will update the inode
itself and call mark_inode_dirty_sync.
``sync_lazytime``:
called by the writeback code to update the lazy time stamps to
regular time stamp updates that get syncing into the on-disk
inode.
``atomic_open``
called on the last component of an open. Using this optional
method the filesystem can look up, possibly create and open the