linux.git/fs/ceph/cache.c, branch v4.14

Merge tag 'ceph-for-4.14-rc1' of git://github.com/ceph/ceph-client

2017-09-13T03:03:53+00:00

Pull ceph updates from Ilya Dryomov:
 "The highlights include:

   - a large series of fixes and improvements to the snapshot-handling
     code (Zheng Yan)

   - individual read/write OSD requests passed down to libceph are now
     limited to 16M in size to avoid hitting OSD-side limits (Zheng Yan)

   - encode MStatfs v2 message to allow for more accurate space usage
     reporting (Douglas Fuller)

   - switch to the new writeback error tracking infrastructure (Jeff
     Layton)"

* tag 'ceph-for-4.14-rc1' of git://github.com/ceph/ceph-client: (35 commits)
  ceph: stop on-going cached readdir if mds revokes FILE_SHARED cap
  ceph: wait on writeback after writing snapshot data
  ceph: fix capsnap dirty pages accounting
  ceph: ignore wbc->range_{start,end} when write back snapshot data
  ceph: fix "range cyclic" mode writepages
  ceph: cleanup local variables in ceph_writepages_start()
  ceph: optimize pagevec iterating in ceph_writepages_start()
  ceph: make writepage_nounlock() invalidate page that beyonds EOF
  ceph: properly get capsnap's size in get_oldest_context()
  ceph: remove stale check in ceph_invalidatepage()
  ceph: queue cap snap only when snap realm's context changes
  ceph: handle race between vmtruncate and queuing cap snap
  ceph: fix message order check in handle_cap_export()
  ceph: fix NULL pointer dereference in ceph_flush_snaps()
  ceph: adjust 36 checks for NULL pointers
  ceph: delete an unnecessary return statement in update_dentry_lease()
  ceph: ENOMEM pr_err in __get_or_create_frag() is redundant
  ceph: check negative offsets in ceph_llseek()
  ceph: more accurate statfs
  ceph: properly set snap follows for cap reconnect
  ...

fscache: remove unused ->now_uncached callback

2017-09-07T00:27:26+00:00

Patch series "Ranged pagevec lookup", v2.

In this series I make pagevec_lookup() update the index (to be
consistent with pagevec_lookup_tag() and also as a preparation for
ranged lookups), provide ranged variant of pagevec_lookup() and use it
in places where it makes sense.  This not only removes some common code
but is also a measurable performance win for some use cases (see patch
4/10) where radix tree is sparse and searching & grabing of a page after
the end of the range has measurable overhead.

This patch (of 10):

The callback doesn't ever get called.  Remove it.

Link: http://lkml.kernel.org/r/20170726114704.7626-2-jack@suse.cz
Signed-off-by: Jan Kara 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ceph: adjust 36 checks for NULL pointers

2017-09-06T17:56:52+00:00

The script “checkpatch.pl” pointed information out like the following.

Comparison to NULL could be written ...

Thus fix the affected source code places.

Signed-off-by: Markus Elfring 
Reviewed-by: Yan, Zheng 
Signed-off-by: Ilya Dryomov

ceph: fix readpage from fscache

2017-08-31T22:04:26+00:00

ceph_readpage() unlocks page prematurely prematurely in the case
that page is reading from fscache. Caller of readpage expects that
page is uptodate when it get unlocked. So page shoule get locked
by completion callback of fscache_read_or_alloc_pages()

Cc: stable@vger.kernel.org # 4.1+, needs backporting for < 4.7
Signed-off-by: "Yan, Zheng" 
Reviewed-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: new mount option that specifies fscache uniquifier

2017-07-07T15:25:14+00:00

Current ceph uses FSID as primary index key of fscache data. This
allows ceph to retain cached data across remount. But this causes
problem (kernel opps, fscache does not support sharing data) when
a filesystem get mounted several times (with fscache enabled, with
different mount options).

The fix is adding a new mount option, which specifies uniquifier
for fscache.

Signed-off-by: "Yan, Zheng" 
Acked-by: Jeff Layton 
Signed-off-by: Ilya Dryomov

ceph: fix spelling mistake: "enabing" -> "enabling"

2017-02-20T11:16:05+00:00

trivial fix to spelling mistake in debug message

Signed-off-by: Colin Ian King 
Signed-off-by: Yan, Zheng

ceph: fix spelling mistake: "resgister" -> "register"

2016-07-28T00:55:40+00:00

trivial fix to spelling mistake in pr_err message

Signed-off-by: Colin Ian King

ceph: use i_version to check validity of fscache

2016-06-01T08:32:14+00:00

Signed-off-by: Yan, Zheng

ceph: improve fscache revalidation

2016-06-01T08:31:50+00:00

There are several issues in fscache revalidation code.
- In ceph_revalidate_work(), fscache_invalidate() is called when
  fscache_check_consistency() return 0. This is complete wrong
  because 0 means cache is valid.
- Handle_cap_grant() calls ceph_queue_revalidate() if client
  already has CAP_FILE_CACHE. This code is confusing. Client
  should revalidate the cache each time it got CAP_FILE_CACHE
  anew.
- In Handle_cap_grant(), fscache_invalidate() is called if MDS
  revokes CAP_FILE_CACHE. This is inconsistency with the case
  that inode get evicted. In the later case, the cache is not
  discarded. Client may use the cache when inode is reloaded.

This patch moves the fscache revalidation into ceph_get_caps().
Client revalidates the cache after it gets CAP_FILE_CACHE.
i_rdcache_gen should keep constance while CAP_FILE_CACHE is
used. If i_fscache_gen is not equal to i_rdcache_gen, client
needs to check cache's consistency.

Signed-off-by: Yan, Zheng

ceph: disable fscache when inode is opened for write

2016-06-01T08:31:07+00:00

All other filesystems do not add dirty pages to fscache. They all
disable fscache when inode is opened for write. Only ceph adds
dirty pages to fscache, but the code is buggy.

Signed-off-by: Yan, Zheng