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of open
* This patch brings in the changes where object versioning is done in write and
truncate fops instead of tracking them in open and create fops. This model
works for both regular and anonymous fds. It also removes the race associated
with open calls, create and lookups.
This patch follows the below method for object versioning and notifications:
Before sending writev on the fd, increase the ongoing
version first. This makes anonymous fd write similar to the regular
fd write by having the ongoing version increased before doing the
write.
Do following steps to do versioning:
1) For anonymous fds set the fd context (so that release is invoked) and add
the fd context to the list maintained in the inode context.
For regular fds the above think would have been done in open itself.
2) Increase the on-disk ongoing version
3) Increase the in memory ongoing version and mark inode as non-dirty
3) Once versioning is successfully done send write operation. If
versioning fails, then fail the write fop.
5) In writev_cbk mark inode as modified.
> Change-Id: I7104391bbe076d8fc49b68745d2ec29a6e92476c
> BUG: 1207979
> Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
> Reviewed-on: http://review.gluster.org/10233
> Tested-by: Gluster Build System <jenkins@build.gluster.com>
> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Change-Id: I4bb86989b5fab02b9ed2950798b1a80e566f1024
BUG: 1220041
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/10722
Reviewed-by: Gaurav Kumar Garg <ggarg@redhat.com>
Tested-by: NetBSD Build System
Tested-by: Gluster Build System <jenkins@build.gluster.com>
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This patch fixes a handful of problem with scrubber which
are detailed below.
Scrubber used to skip objects for verification due to missing
fd iterface to fetch versioning extended attributes. Similar
to the inode interface, an fd based interface in POSIX is now
introduced.
Moreover, this patch also fixes potential false reporting by
scrubber due to:
An object gets dirtied and signed when scrubber is busy
calculatingobject checksum. This is fixed by caching the
signed version when an object is first inspected for
stalenes, i.e., during pre-compute stage. This version is
used to verify checksum in the post-compute stage when the
signatures are compared for possible corruption.
Side effect of _not_ sending signature length during signing
resulted in "truncated" signature to be set for an object.
Now, at the time of signing, the signature length is sent
and is used in place of invoking strlen() to get signature
length (which could have possible 00s). The signature length
itself is not persisted in the signature xattr, but is
calculated on-the-fly by substracting the xattr length by
the "structure" header size.
Some of the log entries are made more meaningful (as and aid
for debugging).
Change-Id: I938bee5aea6688d5d99eb2640053613af86d6269
BUG: 1207624
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/10118
Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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This patch introduces basic object versioning test(s) which
is required for bitrot detection to work correctly. Basic
test(s) such as opening a file in read-only mode, single
open, multiple open()s are covered on FUSE mount _only_ as
stub does not support anonymous fds yet. For this reason,
the test case disables open-behind.
Actual verification is implemented as a C source which
makes use of the same on-disk data structures as used by
the stub code. The data structures are moved to separate
header file which is included by the test script. Such
modularization helps in future enhancements to keep the
version "data type" opaque and provide handful of APIs
version checking (equal/greater/etc..).
[
This is just a start and should grow over time as stub
is enhanced and codebase matures.
]
Change-Id: Ibee20e65a15b56bbdd59fd2703f9305b115aec7a
BUG: 1201724
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/10140
Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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.. and potential bug fixes / memleak.
While assigning initial version to an object, both extended attributes
(namely, ongoing version and the default signing version) were persisted.
This is optimized to just persist the ongoing version along with safe
handling of xattr request(s) in it's absence. This is better than the
earlier approach as the two xattr sets were not atomic anyway (allowing
a request to sneak in between between two set operations). This also
allows to perform sanity checks on objects during lookup()/getxattr():
objects with missing ongoing version but presence of signature are
possible candidates of tampering (and catching implementation bugs).
There were couple of instances in the code where versioning xattrs
were incorrectly removed before in-memory versions were initialized,
which have been fixed with this patch. A memory leak in the IPC code
path is also fixed.
Change-Id: I01c690ccfe7156a883582275f40f79a7c10c0900
BUG: 1207054
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/10117
Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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Bitrot stub implements object versioning required for identifying
signature freshness. More details about versioning is explained
as a part of the "bitrot feature documentation" patch.
Change-Id: I2ad70d9eb109ba4a12148ab8d81336afda529ad9
BUG: 1170075
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/9709
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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