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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-12 14:58:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-12 14:58:35 -0700
commit2b0a80b0d0bb0a3db74588279bf851b28c6c4705 (patch)
tree1d73413afae3617422027194eda5f71f94fd2c07 /Documentation
parent92825b0298ca6822085ef483f914b6e0dea9bf66 (diff)
parentd11ae8e0a76afc506071831854348f2ea1f3290e (diff)
downloadlinux-2b0a80b0d0bb0a3db74588279bf851b28c6c4705.tar.bz2
Merge tag 'ceph-for-5.1-rc1' of git://github.com/ceph/ceph-client
Pull ceph updates from Ilya Dryomov: "The highlights are: - rbd will now ignore discards that aren't aligned and big enough to actually free up some space (myself). This is controlled by the new alloc_size map option and can be disabled if needed. - support for rbd deep-flatten feature (myself). Deep-flatten allows "rbd flatten" to fully disconnect the clone image and its snapshots from the parent and make the parent snapshot removable. - a new round of cap handling improvements (Zheng Yan). The kernel client should now be much more prompt about releasing its caps and it is possible to put a limit on the number of caps held. - support for getting ceph.dir.pin extended attribute (Zheng Yan)" * tag 'ceph-for-5.1-rc1' of git://github.com/ceph/ceph-client: (26 commits) Documentation: modern versions of ceph are not backed by btrfs rbd: advertise support for RBD_FEATURE_DEEP_FLATTEN rbd: whole-object write and zeroout should copyup when snapshots exist rbd: copyup with an empty snapshot context (aka deep-copyup) rbd: introduce rbd_obj_issue_copyup_ops() rbd: stop copying num_osd_ops in rbd_obj_issue_copyup() rbd: factor out __rbd_osd_req_create() rbd: clear ->xferred on error from rbd_obj_issue_copyup() rbd: remove experimental designation from kernel layering ceph: add mount option to limit caps count ceph: periodically trim stale dentries ceph: delete stale dentry when last reference is dropped ceph: remove dentry_lru file from debugfs ceph: touch existing cap when handling reply ceph: pass inclusive lend parameter to filemap_write_and_wait_range() rbd: round off and ignore discards that are too small rbd: handle DISCARD and WRITE_ZEROES separately rbd: get rid of obj_req->obj_request_count libceph: use struct_size() for kmalloc() in crush_decode() ceph: send cap releases more aggressively ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/ceph.txt14
1 files changed, 8 insertions, 6 deletions
diff --git a/Documentation/filesystems/ceph.txt b/Documentation/filesystems/ceph.txt
index 1177052701e1..d2c6a5ccf0f5 100644
--- a/Documentation/filesystems/ceph.txt
+++ b/Documentation/filesystems/ceph.txt
@@ -22,9 +22,7 @@ In contrast to cluster filesystems like GFS, OCFS2, and GPFS that rely
on symmetric access by all clients to shared block devices, Ceph
separates data and metadata management into independent server
clusters, similar to Lustre. Unlike Lustre, however, metadata and
-storage nodes run entirely as user space daemons. Storage nodes
-utilize btrfs to store data objects, leveraging its advanced features
-(checksumming, metadata replication, etc.). File data is striped
+storage nodes run entirely as user space daemons. File data is striped
across storage nodes in large chunks to distribute workload and
facilitate high throughputs. When storage nodes fail, data is
re-replicated in a distributed fashion by the storage nodes themselves
@@ -118,6 +116,10 @@ Mount Options
of a non-responsive Ceph file system. The default is 30
seconds.
+ caps_max=X
+ Specify the maximum number of caps to hold. Unused caps are released
+ when number of caps exceeds the limit. The default is 0 (no limit)
+
rbytes
When stat() is called on a directory, set st_size to 'rbytes',
the summation of file sizes over all files nested beneath that
@@ -160,11 +162,11 @@ More Information
================
For more information on Ceph, see the home page at
- http://ceph.newdream.net/
+ https://ceph.com/
The Linux kernel client source tree is available at
- git://ceph.newdream.net/git/ceph-client.git
+ https://github.com/ceph/ceph-client.git
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client.git
and the source for the full system is at
- git://ceph.newdream.net/git/ceph.git
+ https://github.com/ceph/ceph.git