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An update to the inode ctime typically requires the latest clock value possible. The exception to this rule is when there is a nfsd write delegation and the server is proxying timestamps from the client. When nfsd gets a CB_GETATTR response, update the timestamp value in the inode to the values that the client is tracking. The client doesn't send a ctime value (since that's always determined by the exported filesystem), but it can send a mtime value. In the case where it does, update the ctime to a value commensurate with that instead of the current time. If ATTR_DELEG is set, then use ia_ctime value instead of setting the timestamp to the current time. With the addition of delegated timestamps, the server may receive a request to update only the atime, which doesn't involve a ctime update. Trust the ATTR_CTIME flag in the update and only update the ctime when it's set. Tested-by: Randy Dunlap <rdunlap@infradead.org> # documentation bits Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Jeff Layton <jlayton@kernel.org> Link: https://lore.kernel.org/r/20241002-mgtime-v10-5-d1c4717f5284@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org> |
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