| Commit message (Collapse) | Author | Age | Files | Lines |
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with this change, the xlator APIs will have a dictionary as extra
argument, which is passed between all the layers. This can be
utilized for overloading in some of the operations.
Change-Id: I58a8186b3ef647650280e63f3e5e9b9de7827b40
Signed-off-by: Amar Tumballi <amarts@redhat.com>
BUG: 782265
Reviewed-on: http://review.gluster.com/2960
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>
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needed to implement a proper handling of open flag alterations
using fcntl() on fd.
Change-Id: Ic280d5db6f1dc0418d5c439abb8db1d3ac21ced0
Signed-off-by: Amar Tumballi <amar@gluster.com>
BUG: 782265
Reviewed-on: http://review.gluster.com/2723
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>
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layout->cnt might be modified in cbk's or different threads, which
will lead to corruptions
Change-Id: Icfdab01ac583cb3d27d62f878b79e0098b597952
BUG: 3730
Reviewed-on: http://review.gluster.com/694
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Amar Tumballi <amar@gluster.com>
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* incorporated Avati's comments on the first patch.
* send proper stat information while unwinding
Change-Id: I36982cec610753c241c372272620ab2bd581fd9f
BUG: 3071
Reviewed-on: http://review.gluster.com/408
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>
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Complexity involved: To migrate a file with open fd, we have to
notify the other client process which has the open fd, and make
sure the write()s happening on that fd is properly synced to the
migrated file. Once the migration is complete, the client
process which has open-fd should get notified and it should
start performing all the operations on the new subvolume,
instead of earlier cached volume.
How to solve the notification part:
We can overload the 'postbuf' attribute in the _cbk() function to
understand if a file is 'under-migration' or 'migration-complete'
state. (This will be something similar to deciding whether a file
is DHT-linkfile by its 'mode').
Overall change includes below mentioned major changes:
1. dht_linkfile is decided by only 2 factors (mode(01000),
xattr(trusted.glusterfs.dht.linkto)), instead of earlier
3 factors (size==0)
2. in linkfile self-heal part (in 'dht_lookup_everywhere_cbk()'),
don't delete a linkfile if there is a open-fd on it. It means,
there may be a migration in progress.
3. if a file's revalidate fails with ENOENT, it may be due to file
migration, and hence need a lookup_everywhere()
4. There will be 2 phases of file-migration.
-> Phase 1: Migration in progress
* The source data file will have SGID and STICKY bit set in its mode.
* The source data file will have a 'linkto' xattr pointing the
destination.
* Destination file will have mode set to '01000', and 'linkto' xattr
set to itself.
-> Phase 2: File migration Complete
* The source data file will have mode '01000', and will be 'truncated'
to size 0.
* The destination file will have inherited mode from the source. (without
sgid and sticky bit) and its 'linkto' attribute will be removed.
4. Changes in distribute to work smoothly with a file which is in migration /
got migrated.
The 'fops' are divided into 3 categories, inode-read, inode-write and others.
inode-read fops need to handle only 'phase 2' notification, where as, the
inode-write fops need to handle both 'phase 1' and phase2. The inode-write
operations will be done on source file, and if any of 'file-migration' procedures
are detected in _cbk(), then the operations should be performed on the destination
too.
when a phase-2 is detected, then the inode-ctx itself should be changed to represent
a new layout.
With these changes, the open file migration will work smoothly with multiple clients.
Change-Id: I512408463814e650f34c62ed009bf2101d016fd6
BUG: 3071
Reviewed-on: http://review.gluster.com/209
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>
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