BMC/Intel-BMC/linux.git/fs/ceph/mds_client.h, branch dev

ceph: rework dcache readdir

2015-06-25T08:49:32+00:00

Previously our dcache readdir code relies on that child dentries in directory dentry's d_subdir list are sorted by dentry's offset in descending order. When adding dentries to the dcache, if a dentry already exists, our readdir code moves it to head of directory dentry's d_subdir list. This design relies on dcache internals. Al Viro suggests using ncpfs's approach: keeping array of pointers to dentries in page cache of directory inode. the validity of those pointers are presented by directory inode's complete and ordered flags. When a dentry gets pruned, we clear directory inode's complete flag in the d_prune() callback. Before moving a dentry to other directory, we clear the ordered flag for both old and new directory. Signed-off-by: Yan, Zheng

ceph: track pending caps flushing globally

2015-06-25T08:49:31+00:00

So we know TID of the oldest pending caps flushing. Later patch will send this information to MDS, so that MDS can trim its completed caps flush list. Tracking pending caps flushing globally also simplifies syncfs code. Signed-off-by: Yan, Zheng

ceph: track pending caps flushing accurately

2015-06-25T08:49:30+00:00

Previously we do not trace accurate TID for flushing caps. when MDS failovers, we have no choice but to re-send all flushing caps with a new TID. This can cause problem because MDS can has already flushed some caps and has issued the same caps to other client. The re-sent cap flush has a new TID, which makes MDS unable to detect if it has already processed the cap flush. This patch adds code to track pending caps flushing accurately. When re-sending cap flush is needed, we use its original flush TID. Signed-off-by: Yan, Zheng

libceph: store timeouts in jiffies, verify user input

2015-06-25T08:49:29+00:00

There are currently three libceph-level timeouts that the user can specify on mount: mount_timeout, osd_idle_ttl and osdkeepalive. All of these are in seconds and no checking is done on user input: negative values are accepted, we multiply them all by HZ which may or may not overflow, arbitrarily large jiffies then get added together, etc. There is also a bug in the way mount_timeout=0 is handled. It's supposed to mean "infinite timeout", but that's not how wait.h APIs treat it and so __ceph_open_session() for example will busy loop without much chance of being interrupted if none of ceph-mons are there. Fix all this by verifying user input, storing timeouts capped by msecs_to_jiffies() in jiffies and using the new ceph_timeout_jiffies() helper for all user-specified waits to handle infinite timeouts correctly. Signed-off-by: Ilya Dryomov Reviewed-by: Alex Elder

ceph: exclude setfilelock requests when calculating oldest tid

2015-06-25T08:49:29+00:00

setfilelock requests can block for a long time, which can prevent client from advancing its oldest tid. Signed-off-by: Yan, Zheng

ceph: don't pre-allocate space for cap release messages

2015-06-25T08:49:29+00:00

Previously we pre-allocate cap release messages for each caps. This wastes lots of memory when there are large amount of caps. This patch make the code not pre-allocate the cap release messages. Instead, we add the corresponding ceph_cap struct to a list when releasing a cap. Later when flush cap releases is needed, we allocate the cap release messages dynamically. Signed-off-by: Yan, Zheng

ceph: make sure syncfs flushes all cap snaps

2015-06-25T08:49:29+00:00

Signed-off-by: Yan, Zheng

ceph: check OSD caps before read/write

2015-06-25T08:49:28+00:00

Signed-off-by: Yan, Zheng

ceph: avoid block operation when !TASK_RUNNING (ceph_mdsc_close_sessions)

2015-02-19T10:31:38+00:00

use an atomic variable to track number of sessions, this can avoid block operation inside wait loops. Signed-off-by: Yan, Zheng

ceph: handle SESSION_FORCE_RO message

2015-02-19T10:31:37+00:00

mark session as readonly and wake up all cap waiters. Signed-off-by: Yan, Zheng