wireguard-linux/fs/ceph/mds_client.c, branch jd/unified-crypt-queue

ceph: consider inode's last read/write when calculating wanted caps

2020-03-30T10:42:42Z

Add i_last_rd and i_last_wr to ceph_inode_info. These fields are used to track the last time the client acquired read/write caps for the inode. If there is no read/write on an inode for 'caps_wanted_delay_max' seconds, __ceph_caps_file_wanted() does not request caps for read/write even there are open files. Call __ceph_touch_fmode() for dir operations. __ceph_caps_file_wanted() calculates dir's wanted caps according to last dir read/modification. If there is recent dir read, dir inode wants CEPH_CAP_ANY_SHARED caps. If there is recent dir modification, also wants CEPH_CAP_FILE_EXCL. Readdir is a special case. Dir inode wants CEPH_CAP_FILE_EXCL after readdir, as with that, modifications do not need to release CEPH_CAP_FILE_SHARED or invalidate all dentry leases issued by readdir. Signed-off-by: "Yan, Zheng" Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov

ceph: always renew caps if mds_wanted is insufficient

2020-03-30T10:42:42Z

Original code only renews caps for inodes with CEPH_I_CAP_DROPPED flag, which indicates that mds has closed the session and caps were dropped. Remove this flag in preparation for not requesting caps for idle open files. Signed-off-by: "Yan, Zheng" Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov

ceph: cache layout in parent dir on first sync create

2020-03-30T10:42:42Z

If a create is done, then typically we'll end up writing to the file soon afterward. We don't want to wait for the reply before doing that when doing an async create, so that means we need the layout for the new file before we've gotten the response from the MDS. All files created in a directory will initially inherit the same layout, so copy off the requisite info from the first synchronous create in the directory, and save it in a new i_cached_layout field. Zero out the layout when we lose Dc caps in the dir. Signed-off-by: Jeff Layton Reviewed-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov

ceph: add new MDS req field to hold delegated inode number

2020-03-30T10:42:42Z

Add new request field to hold the delegated inode number. Encode that into the message when it's set. Signed-off-by: Jeff Layton Reviewed-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov

ceph: decode interval_sets for delegated inos

2020-03-30T10:42:42Z

Starting in Octopus, the MDS will hand out caps that allow the client to do asynchronous file creates under certain conditions. As part of that, the MDS will delegate ranges of inode numbers to the client. Add the infrastructure to decode these ranges, and stuff them into an xarray for later consumption by the async creation code. Because the xarray code currently only handles unsigned long indexes, and those are 32-bits on 32-bit arches, we only enable the decoding when running on a 64-bit arch. Signed-off-by: Jeff Layton Reviewed-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov

ceph: cap tracking for async directory operations

2020-03-30T10:42:41Z

Track and correctly handle directory caps for asynchronous operations. Add aliases for Frc caps that we now designate at Dcu caps (when dealing with directories). Unlike file caps, we don't reclaim these when the session goes away, and instead preemptively release them. In-flight async dirops are instead handled during reconnect phase. The client needs to re-do a synchronous operation in order to re-get directory caps. Signed-off-by: Jeff Layton Reviewed-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov

ceph: add infrastructure for waiting for async create to complete

2020-03-30T10:42:41Z

When we issue an async create, we must ensure that any later on-the-wire requests involving it wait for the create reply. Expand i_ceph_flags to be an unsigned long, and add a new bit that MDS requests can wait on. If the bit is set in the inode when sending caps, then don't send it and just return that it has been delayed. Signed-off-by: Jeff Layton Reviewed-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov

ceph: add flag to designate that a request is asynchronous

2020-03-30T10:42:41Z

...and ensure that such requests are never queued. The MDS has need to know that a request is asynchronous so add flags and proper infrastructure for that. Also, delegated inode numbers and directory caps are associated with the session, so ensure that async requests are always transmitted on the first attempt and are never queued to wait for session reestablishment. If it does end up looking like we'll need to queue the request, then have it return -EJUKEBOX so the caller can reattempt with a synchronous request. Signed-off-by: Jeff Layton Reviewed-by: "Yan, Zheng" Signed-off-by: Ilya Dryomov

ceph: return ETIMEDOUT errno to userland when request timed out

2020-03-30T10:42:41Z

req->r_timeout is only used during mounting, so this error will be more accurate. URL: https://tracker.ceph.com/issues/44215 Signed-off-by: Xiubo Li Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov

ceph: move to a dedicated slabcache for mds requests

2020-03-30T10:42:41Z

On my machine (x86_64) this struct is 952 bytes, which gets rounded up to 1024 by kmalloc. Move this to a dedicated slabcache, so we can allocate them without the extra 72 bytes of overhead per. Signed-off-by: Jeff Layton Reviewed-by: Ilya Dryomov Signed-off-by: Ilya Dryomov