Commit Graph

1459 Commits

Author SHA1 Message Date
Sage Weil
33aa96e743 crush: always return a value from crush_bucket_choose
Even when we encounter a corrupt bucket.  We still BUG().  This fixes
the warning

fs/ceph/crush/mapper.c: In function 'crush_choose':
fs/ceph/crush/mapper.c:352: warning: control may reach end of non-void function
'crush_bucket_choose' being inlined

Signed-off-by: Sage Weil <sage@newdream.net>
2009-11-01 17:53:24 -08:00
Sage Weil
63ff78b25c ceph: fix uninitialized err variable
Fixes warning
fs/ceph/xattr.c: In function '__build_xattrs':
fs/ceph/xattr.c:353: warning: 'err' may be used uninitialized in this function

Signed-off-by: Sage Weil <sage@newdream.net>
2009-11-01 17:51:15 -08:00
Noah Watkins
ff1d1f7179 ceph: fix intra strip unit length calculation
Commit 645a102581 fixes calculation of object
offset for layouts with multiple stripes per object. This updates the
calculation of the length written to take into account multiple stripes per
object.

Signed-off-by: Noah Watkins <noah@noahdesu.com>
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-30 13:56:14 -07:00
Sage Weil
645a102581 ceph: fix object striping calculation for non-default striping schemes
We were incorrectly calculationing of object offset.  If we have multiple
stripe units per object, we need to shift to the start of the current
su in addition to the offset within the su.

Also rename bno to ono (object number) to avoid some variable naming
confusion.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-28 17:45:41 -07:00
Sage Weil
5600f5ebd3 ceph: correct comment to match striping calculation
The object extent offset is the file offset _modulo_ the stripe unit.
The code was correct, the comment was wrong.

Reported-by: Noah Watkins <jayhawk@soe.ucsc.edu>
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-28 17:45:37 -07:00
Noah Watkins
35e054a66e ceph: remove redundant use of le32_to_cpu
Using stripe unit size calculated and saved on the stack to avoid
a redundant call to le32_to_cpu.

Signed-off-by: Noah Watkins <noah@noahdesu.com>
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-28 17:44:37 -07:00
Noah Watkins
fbbccec9c6 ceph: replace list_entry with container_of
Usage of non-list.h list_entry function for container_of
functionality replaced with direct use of container_of.

Signed-off-by: Noah Watkins <noah@noahdesu.com>
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-28 17:44:22 -07:00
Sage Weil
6b8051855d ceph: allocate and parse mount args before client instance
This simplifies much of the error handling during mount.  It also means
that we have the mount args before client creation, and we can initialize
based on those options.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-27 11:57:03 -07:00
Sage Weil
e53c2fe075 ceph: fix, clean up string mount arg parsing
Clearly demark int and string argument options, and do not try to convert
string arguments to ints.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-27 11:17:25 -07:00
Sage Weil
6ca874e92d ceph: silence uninitialized variable warning
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-26 22:07:59 -07:00
Sage Weil
7b813c4602 ceph: reduce parse_mount_args stack usage
Since we've increased the max mon count, we shouldn't put the addr array
on the parse_mount_args stack.  Put it on the heap instead.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-26 22:07:53 -07:00
Sage Weil
ecb19c4649 ceph: remove small mon addr limit; use CEPH_MAX_MON where appropriate
Get rid of separate max mon limit; use the system limit instead.  This
allows mounts when there are lots of mon addrs provided by mount.ceph (as
with a host with lots of A/AAAA records).

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-22 10:53:17 -07:00
Sage Weil
232d4b0131 ceph: move directory size logic to ceph_getattr
We can't fill i_size with rbytes at the fill_file_size stage without
adding additional checks for directories.  Notably, we want st_blocks
to remain 0 on directories so that 'du' still works.

Fill in i_blocks, i_size specially in ceph_getattr instead.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-21 11:24:36 -07:00
Sage Weil
bb097ffaf8 ceph: v0.17 of client
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-19 16:17:31 -07:00
Sage Weil
ee7fdfaff7 ceph: include preferred osd in placement seed
Mix the preferred osd (if any) into the placement seed that is fed into
the CRUSH object placement calculation.  This prevents all the placement
pgs from peering with the same osds.

Rev the osd client protocol with this change.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-19 11:42:41 -07:00
Sage Weil
8fa9765576 ceph: enable readahead
Initialized bdi->ra_pages to enable readahead.  Use 512KB default.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-16 14:44:43 -07:00
Sage Weil
76e3b390d4 ceph: move dirty caps code around
Cleanup only.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-15 18:14:44 -07:00
Sage Weil
8f3bc053c6 ceph: warn on allocation from msgpool with larger front_len
Pass the front_len we need when pulling a message off a msgpool,
and WARN if it is greater than the pool's size.  Then try to
allocate a new message (to continue without failing).

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-15 18:14:43 -07:00
Sage Weil
07bd10fb98 ceph: correct subscribe_ack msgpool payload size
Defined a struct for the SUBSCRIBE_ACK, and use that to size
the msgpool.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-15 18:14:42 -07:00
Sage Weil
afcdaea3f2 ceph: flush dirty caps via the cap_dirty list
Previously we were flushing dirty caps by passing an extra flag
when traversing the delayed caps list.  Besides being a bit ugly,
that can also miss caps that are dirty but didn't result in a
cap requeue: notably, mark_caps_dirty().

Separate the flushing into a separate helper, and traverse the
cap_dirty list.

This also brings i_dirty_item in line with i_dirty_caps: we are
on the list IFF caps != 0.  We carry an inode ref IFF
dirty_caps|flushing_caps != 0.

Lose the unused return value from __ceph_mark_caps_dirty().

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-15 18:14:35 -07:00
Sage Weil
cdc35f9627 ceph: move generic flushing code into helper
Both callers of __mark_caps_flushing() do the same work; move it
into the helper.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-14 14:43:56 -07:00
Sage Weil
f2cf418cec ceph: initialize sb->s_bdi, bdi_unregister after kill_anon_super
Writeback doesn't work without the bdi set, and writeback on
umount doesn't work if we unregister the bdi too early.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-14 14:09:07 -07:00
Sage Weil
c89136ea42 ceph: convert encode/decode macros to inlines
This avoids the fugly pass by reference and makes the code a bit easier
to read.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-14 09:59:09 -07:00
Sage Weil
535bbb5307 ceph: add version field to message header
This makes it easier for individual message types to indicate
their particular encoding, and make future changes backward
compatible.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-13 12:55:26 -07:00
Sage Weil
572033069d ceph: remove unused CEPH_MSG_{OSD,MDS}_GETMAP
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-12 10:29:44 -07:00
Sage Weil
8fc57da4d3 ceph: ignore trailing data in monamp
This lets us extend the format more easily.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-12 10:29:24 -07:00
Sage Weil
752727a1b2 ceph: add file layout validation
This tracks updates to code shared with userspace.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-09 16:39:30 -07:00
Sage Weil
13e38c8ae7 ceph: update to mon client protocol v15
The mon request headers now include session_mon information that must
be properly initialized.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-09 16:39:27 -07:00
Sage Weil
266673db42 ceph: cancel osd requests before resending them
This ensures we don't submit the same request twice if we are kicking a
specific osd (as with an osd_reset), or when we hit a transient error and
resend.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-09 11:58:20 -07:00
Sage Weil
81b024e70f ceph: reset osd session on fault, not peer_reset
The peer_reset just takes longer (until we reconnect and discover the osd
dropped the session... which it will).

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-09 11:58:15 -07:00
Sage Weil
991abb6ecf ceph: fail gracefully on corrupt osdmap (bad pg_temp mapping)
Return an error and report a corrupt map instead of crying BUG().

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-09 11:58:11 -07:00
Sage Weil
0ba6478df7 ceph: revoke osd request message on request completion
If an osd has failed or returned and a request has been sent twice, it's
possible to get a reply and unregister the request while the request
message is queued for delivery.  Since the message references the caller's
page vector, we need to revoke it before completing.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-09 11:58:07 -07:00
Sage Weil
c1ea8823be ceph: fix osd request submission race
The osd request submission path registers the request, drops and retakes
the request_mutex, then sends it to the OSD.  A racing kick_requests could
sent it during that interval, causing the same msg to be sent twice and
BUGing in the msgr.

Fix by only sending the message if it hasn't been touched by other
threads.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-09 11:58:03 -07:00
Sage Weil
0656d11ba6 ceph: renew mon subscription before it expires
Be conservative: renew subscription once half the interval has expired.

Do not reuse sub expiration to control hunting.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-08 10:39:08 -07:00
Sage Weil
e251e28808 ceph: fix mdsmap decoding when multiple mds's are present
A misplaced sizeof() around namelen was throwing things off.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 16:38:55 -07:00
Sage Weil
b28813a61d ceph: gracefully avoid empty crush buckets
This avoids a divide by zero when the input and/or map are
malformed.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 10:59:34 -07:00
Sage Weil
b195befd9a ceph: include preferred_osd in file layout virtual xattr
Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 10:59:30 -07:00
Sage Weil
fa0b72e9e2 ceph: show meaningful version on module load
Kill the old git revision; print the ceph version and protocol
versions instead.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-07 10:59:10 -07:00
Sage Weil
e324b8f991 ceph: document shared files in README
Document files shared between kernel and user code trees.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 12:21:17 -07:00
Sage Weil
9030aaf9bf ceph: Kconfig, Makefile
Kconfig options and Makefile.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:15 -07:00
Sage Weil
76aa844d5b ceph: debugfs
Basic state information is available via /sys/kernel/debug/ceph,
including instances of the client, fsids, current monitor, mds and osd
maps, outstanding server requests, and hooks to adjust debug levels.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:14 -07:00
Sage Weil
8f4e91dee2 ceph: ioctls
A few Ceph ioctls for getting and setting file layout (striping)
parameters, and learning the identity and network address of the OSD a
given region of a file is stored on.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:14 -07:00
Sage Weil
a8e63b7d51 ceph: nfs re-export support
Basic NFS re-export support is included.  This mostly works.  However,
Ceph's MDS design precludes the ability to generate a (small)
filehandle that will be valid forever, so this is of limited utility.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:13 -07:00
Sage Weil
8fc91fd859 ceph: message pools
The msgpool is a basic mempool_t-like structure to preallocate
messages we expect to receive over the wire.  This ensures we have the
necessary memory preallocated to process replies to requests, or to
process unsolicited messages from various servers.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:13 -07:00
Sage Weil
31b8006e1d ceph: messenger library
A generic message passing library is used to communicate with all
other components in the Ceph file system.  The messenger library
provides ordered, reliable delivery of messages between two nodes in
the system.

This implementation is based on TCP.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:13 -07:00
Sage Weil
963b61eb04 ceph: snapshot management
Ceph snapshots rely on client cooperation in determining which
operations apply to which snapshots, and appropriately flushing
snapshotted data and metadata back to the OSD and MDS clusters.
Because snapshots apply to subtrees of the file hierarchy and can be
created at any time, there is a fair bit of bookkeeping required to
make this work.

Portions of the hierarchy that belong to the same set of snapshots
are described by a single 'snap realm.'  A 'snap context' describes
the set of snapshots that exist for a given file or directory.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:12 -07:00
Sage Weil
a8599bd821 ceph: capability management
The Ceph metadata servers control client access to inode metadata and
file data by issuing capabilities, granting clients permission to read
and/or write both inode field and file data to OSDs (storage nodes).
Each capability consists of a set of bits indicating which operations
are allowed.

If the client holds a *_SHARED cap, the client has a coherent value
that can be safely read from the cached inode.

In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the client
is allowed to change inode attributes (e.g., file size, mtime), note
its dirty state in the ceph_cap, and asynchronously flush that
metadata change to the MDS.

In the event of a conflicting operation (perhaps by another client),
the MDS will revoke the conflicting client capabilities.

In order for a client to cache an inode, it must hold a capability
with at least one MDS server.  When inodes are released, release
notifications are batched and periodically sent en masse to the MDS
cluster to release server state.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:12 -07:00
Sage Weil
ba75bb98cf ceph: monitor client
The monitor cluster is responsible for managing cluster membership
and state.  The monitor client handles what minimal interaction
the Ceph client has with it: checking for updated versions of the
MDS and OSD maps, getting statfs() information, and unmounting.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:11 -07:00
Sage Weil
5ecc0a0f81 ceph: CRUSH mapping algorithm
CRUSH is a pseudorandom data distribution function designed to map
inputs onto a dynamic hierarchy of devices, while minimizing the
extent to which inputs are remapped when the devices are added or
removed.  It includes some features that are specifically useful for
storage, most notably the ability to map each input onto a set of N
devices that are separated across administrator-defined failure
domains.  CRUSH is used to distribute data across the cluster of Ceph
storage nodes.

More information about CRUSH can be found in this paper:

    http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:11 -07:00
Sage Weil
f24e9980eb ceph: OSD client
The OSD client is responsible for reading and writing data from/to the
object storage pool.  This includes determining where objects are
stored in the cluster, and ensuring that requests are retried or
redirected in the event of a node failure or data migration.

If an OSD does not respond before a timeout expires, keepalive
messages are sent across the lossless, ordered communications channel
to ensure that any break in the TCP is discovered.  If the session
does reset, a reconnection is attempted and affected requests are
resent (by the message transport layer).

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:10 -07:00
Sage Weil
2f2dc05340 ceph: MDS client
The MDS (metadata server) client is responsible for submitting
requests to the MDS cluster and parsing the response.  We decide which
MDS to submit each request to based on cached information about the
current partition of the directory hierarchy across the cluster.  A
stateful session is opened with each MDS before we submit requests to
it, and a mutex is used to control the ordering of messages within
each session.

An MDS request may generate two responses.  The first indicates the
operation was a success and returns any result.  A second reply is
sent when the operation commits to disk.  Note that locking on the MDS
ensures that the results of updates are visible only to the updating
client before the operation commits.  Requests are linked to the
containing directory so that an fsync will wait for them to commit.

If an MDS fails and/or recovers, we resubmit requests as needed.  We
also reconnect existing capabilities to a recovering MDS to
reestablish that shared session state.  Old dentry leases are
invalidated.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:09 -07:00
Sage Weil
1d3576fd10 ceph: address space operations
The ceph address space methods are concerned primarily with managing
the dirty page accounting in the inode, which (among other things)
must keep track of which snapshot context each page was dirtied in,
and ensure that dirty data is written out to the OSDs in snapshort
order.

A writepage() on a page that is not currently writeable due to
snapshot writeback ordering constraints is ignored (it was presumably
called from kswapd).

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:09 -07:00
Sage Weil
124e68e740 ceph: file operations
File open and close operations, and read and write methods that ensure
we have obtained the proper capabilities from the MDS cluster before
performing IO on a file.  We take references on held capabilities for
the duration of the read/write to avoid prematurely releasing them
back to the MDS.

We implement two main paths for read and write: one that is buffered
(and uses generic_aio_{read,write}), and one that is fully synchronous
and blocking (operating either on a __user pointer or, if O_DIRECT,
directly on user pages).

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:08 -07:00
Sage Weil
2817b000b0 ceph: directory operations
Directory operations, including lookup, are defined here.  We take
advantage of lookup intents when possible.  For the most part, we just
need to build the proper requests for the metadata server(s) and
pass things off to the mds_client.

The results of most operations are normally incorporated into the
client's cache when the reply is parsed by ceph_fill_trace().
However, if the MDS replies without a trace (e.g., when retrying an
update after an MDS failure recovery), some operation-specific cleanup
may be needed.

We can validate cached dentries in two ways.  A per-dentry lease may
be issued by the MDS, or a per-directory cap may be issued that acts
as a lease on the entire directory.  In the latter case, a 'gen' value
is used to determine which dentries belong to the currently leased
directory contents.

We normally prepopulate the dcache and icache with readdir results.
This makes subsequent lookups and getattrs avoid any server
interaction.  It also lets us satisfy readdir operation by peeking at
the dcache IFF we hold the per-directory cap/lease, previously
performed a readdir, and haven't dropped any of the resulting
dentries.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:08 -07:00
Sage Weil
355da1eb7a ceph: inode operations
Inode cache and inode operations.  We also include routines to
incorporate metadata structures returned by the MDS into the client
cache, and some helpers to deal with file capabilities and metadata
leases.  The bulk of that work is done by fill_inode() and
fill_trace().

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:08 -07:00
Sage Weil
16725b9d2a ceph: super.c
Mount option parsing, client setup and teardown, and a few odds and
ends (e.g., statfs).

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:07 -07:00
Sage Weil
c30dbb9cc7 ceph: ref counted buffer
struct ceph_buffer is a simple ref-counted buffer.  We transparently
choose between kmalloc for small buffers and vmalloc for large ones.

This is currently used only for allocating memory for xattr data.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:07 -07:00
Sage Weil
de57606c23 ceph: client types
We first define constants, types, and prototypes for the kernel client
proper.

A few subsystems are defined separately later: the MDS, OSD, and
monitor clients, and the messaging layer.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:07 -07:00
Sage Weil
0dee3c28af ceph: on-wire types
These headers describe the types used to exchange messages between the
Ceph client and various servers.  All types are little-endian and
packed.  These headers are shared between the kernel and userspace, so
all types are in terms of e.g. __u32.

Additionally, we define a few magic values to identify the current
version of the protocol(s) in use, so that discrepancies to be
detected on mount.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-10-06 11:31:06 -07:00