glusterfs-afrv1.git/libglusterfs/src/syncop.h, branch v3.3.0qa13

distribute rebalance: handle the open file migration

2011-09-13T06:57:38+00:00

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 
Reviewed-by: Vijay Bellur

Change Copyright current year

2011-08-10T17:57:19+00:00

Change-Id: I2d10f2be44f518f496427f257988f1858e888084
BUG: 3348
Reviewed-on: http://review.gluster.com/200
Tested-by: Gluster Build System 
Reviewed-by: Anand Avati

LICENSE: s/GNU Affero General Public/GNU General Public/

2011-08-06T13:33:52+00:00

Change-Id: I3914467611e573cccee0d22df93920cf1b2eb79f
BUG: 3348
Reviewed-on: http://review.gluster.com/182
Tested-by: Gluster Build System 
Reviewed-by: Anand Avati

libglusterfs/syncop: add more functions

2011-07-12T06:18:48+00:00

do proper 'ref's and implement 'write()' and 'ftruncate()'

Signed-off-by: Amar Tumballi 
Signed-off-by: Anand Avati 

BUG: 3081 (synchronous operations should be enhanced)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=3081

libglusterfs: added syncop_* functions

2011-06-24T04:31:10+00:00

* implemented open,close,readv,writev,listxattr,create,unlink

* also fixed a dictionary ref issue with lookup_cbk

Signed-off-by: Amar Tumballi 
Signed-off-by: Anand Avati 

BUG: 3081 (synchronous operations should be enhanced)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=3081

syncop: Modified to accept one 'non-frame' arg.

2011-06-16T16:15:00+00:00

Earlier syncops used to accept one argument which
was a call frame to carry out the fops synchronously.
Now we have two args passed to synctask function, one
call frame and another void pointer.

Signed-off-by: Krishnan Parthasarathi 
Signed-off-by: Anand Avati 

BUG: 3033 (Changes to replace-brick and syntask interface.)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=3033

syncop: Increase stack size for deep call stack.

2011-06-08T16:57:24+00:00

pump performs a depth-first traversal of directories using the
syncop stack and this necessitates a larger stack when handling
deeper directory trees.

Signed-off-by: Krishnan Parthasarathi 
Signed-off-by: Anand Avati 

BUG: 2489 (GlusterFS crashing with replace-brick)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2489

libglusterfs: all header files updated

2011-03-17T18:57:17+00:00

* whitespace cleanup       (M-x whitespace-cleanup)
* indentation fixes        (M-x indent-region)
* replaced tab with spaces (M-x untabify)

Signed-off-by: Amar Tumballi 
Signed-off-by: Vijay Bellur 

BUG: 2346 (Log message enhancements in GlusterFS - phase 1)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2346

Change GNU GPL to GNU AGPL

2010-10-04T14:50:05+00:00

Signed-off-by: Pranith Kumar K 
Signed-off-by: Vijay Bellur 

BUG: 1388 ()
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1388

add pump xlator and changes for replace-brick

2010-08-06T11:09:07+00:00

Signed-off-by: Pavan Vilas Sondur 
Signed-off-by: Anand V. Avati 

BUG: 1235 (Bug for all pump/migrate commits)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1235