ec: Fix posix compliance failures

This patch solves some problems that caused dispersed volumes to not
pass posix smoke tests:

* Problems in open/create with O_WRONLY
    Opening files with -w- permissions using O_WRONLY returned an EACCES
    error because internally O_WRONLY was replaced with O_RDWR.

* Problems with entrylk on renames.
    When source and destination were the same, ec tried to acquire
    the same entrylk twice, causing a deadlock.

* Overwrite of a variable when reordering locks.
    On a rename, if the second lock needed to be placed at the beggining
    of the list, the 'lock' variable was overwritten and later its timer
    was cancelled, cancelling the incorrect one.

* Handle O_TRUNC in open.
    When O_TRUNC was received in an open call, it was blindly propagated
    to child subvolumes. This caused a discrepancy between real file
    size and the size stored into trusted.ec.size xattr. This has been
    solved by removing O_TRUNC from open and later calling ftruncate.

Change-Id: I20c3d6e1c11be314be86879be54b728e01013798
BUG: 1161886
Signed-off-by: Xavier Hernandez <xhernandez@datalab.es>
Reviewed-on: http://review.gluster.org/9420
Reviewed-by: Dan Lambright <dlambrig@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/xlators/cluster/ec/src/ec-dir-write.c b/xlators/cluster/ec/src/ec-dir-write.c
index e8d96272987..d48be20470d 100644
--- a/xlators/cluster/ec/src/ec-dir-write.c
+++ b/xlators/cluster/ec/src/ec-dir-write.c
@@ -158,10 +158,7 @@ int32_t ec_manager_create(ec_fop_data_t * fop, int32_t state)
                 return EC_STATE_REPORT;
             }
 
-            if (ctx->flags == 0)
-            {
-                ctx->flags = fop->int32;
-            }
+            ctx->flags = fop->int32;
 
             UNLOCK(&fop->fd->lock);
 
@@ -207,8 +204,7 @@ int32_t ec_manager_create(ec_fop_data_t * fop, int32_t state)
 
             /* We need to write to specific offsets on the bricks, so we
              * need to remove O_APPEND from flags (if present) */
-            fop->int32 &= ~(O_ACCMODE | O_APPEND);
-            fop->int32 |= O_RDWR;
+            fop->int32 &= ~O_APPEND;
 
         /* Fall through */