cluster/dht: Don't set posix acls on linkto files

Posix acls on a linkto file change the file's permission
bits and cause DHT to treat it as a non-linkto file.This
happens on the migration failure of a file on which posix
 acls were set.

The fix prevents posix acls from being set on a linkto
file and copies them across only after a file has
been successfully migrated.

Change-Id: Iccf7ff6fba49fe05d691d9b83bf76a240848b212
BUG: 1247563
Signed-off-by: Nithya Balachandran <nbalacha@redhat.com>
Signed-off-by: N Balachandran <nbalacha@redhat.com>
Reviewed-on: http://review.gluster.org/12025
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

4 files changed, 57 insertions, 7 deletions

diff --git a/xlators/cluster/dht/src/dht-rebalance.c b/xlators/cluster/dht/src/dht-rebalance.c
index 7c91d176ff3..6b3299c4990 100644
--- a/xlators/cluster/dht/src/dht-rebalance.c
+++ b/xlators/cluster/dht/src/dht-rebalance.c
@@ -1277,6 +1277,40 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
                 ret = -1;
         }
 
+        /* Posix acls are not set on DHT linkto files as part of the initial
+         * initial xattrs set on the dst file, so these need
+         * to be set on the dst file after the linkto attrs are removed.
+         * TODO: Optimize this.
+         */
+        if (xattr) {
+                dict_unref (xattr);
+                xattr = NULL;
+        }
+
+        ret = syncop_listxattr (from, loc, &xattr, NULL, NULL);
+        if (ret < 0) {
+                gf_msg (this->name, GF_LOG_WARNING, 0,
+                        DHT_MSG_MIGRATE_FILE_FAILED,
+                        "Migrate file failed:"
+                        "%s: failed to get xattr from %s (%s)",
+                        loc->path, from->name, strerror (-ret));
+                ret = -1;
+        } else {
+                ret = syncop_setxattr (to, loc, xattr, 0, NULL, NULL);
+                if (ret < 0) {
+                        /* Potential problem here where Posix ACLs will
+                         * not be set on the target file */
+
+                        gf_msg (this->name, GF_LOG_WARNING, 0,
+                                DHT_MSG_MIGRATE_FILE_FAILED,
+                                "Migrate file failed:"
+                                "%s: failed to set xattr on %s (%s)",
+                                loc->path, to->name, strerror (-ret));
+                        ret = -1;
+                }
+        }
+
+
         /* The src file is being unlinked after this so we don't need
            to clean it up */
         clean_src = _gf_false;
diff --git a/xlators/storage/posix/src/posix-helpers.c b/xlators/storage/posix/src/posix-helpers.c
index a89da58ef7c..5d2cb7396a3 100644
--- a/xlators/storage/posix/src/posix-helpers.c
+++ b/xlators/storage/posix/src/posix-helpers.c
@@ -1067,7 +1067,7 @@ void posix_dump_buffer (xlator_t *this, const char *real_path, const char *key,
 
 int
 posix_handle_pair (xlator_t *this, const char *real_path,
-                   char *key, data_t *value, int flags)
+                   char *key, data_t *value, int flags, struct iatt *stbuf)
 {
         int sys_ret = -1;
         int ret     = 0;
@@ -1079,7 +1079,12 @@ posix_handle_pair (xlator_t *this, const char *real_path,
                 ret = posix_set_file_contents (this, real_path, key, value,
                                                flags);
         } else if (GF_POSIX_ACL_REQUEST (key)) {
+                if (stbuf && IS_DHT_LINKFILE_MODE (stbuf))
+                        goto out;
                 ret = posix_pacl_set (real_path, key, value->data);
+        } else if (!strncmp(key, POSIX_ACL_ACCESS_XATTR, strlen(key))
+                   && stbuf && IS_DHT_LINKFILE_MODE (stbuf)) {
+                goto out;
         } else {
                 sys_ret = sys_lsetxattr (real_path, key, value->data,
                                          value->len, flags);
@@ -1130,7 +1135,7 @@ out:
 
 int
 posix_fhandle_pair (xlator_t *this, int fd,
-                    char *key, data_t *value, int flags)
+                    char *key, data_t *value, int flags, struct iatt *stbuf)
 {
         int sys_ret = -1;
         int ret     = 0;
@@ -1138,6 +1143,9 @@ posix_fhandle_pair (xlator_t *this, int fd,
         if (XATTR_IS_PATHINFO (key)) {
                 ret = -EACCES;
                 goto out;
+        } else if (!strncmp(key, POSIX_ACL_ACCESS_XATTR, strlen(key))
+                   && stbuf && IS_DHT_LINKFILE_MODE (stbuf)) {
+                goto out;
         }
 
         sys_ret = sys_fsetxattr (fd, key, value->data,
@@ -1520,7 +1528,7 @@ _handle_entry_create_keyvalue_pair (dict_t *d, char *k, data_t *v,
         }
 
         ret = posix_handle_pair (filler->this, filler->real_path, k, v,
-                                 XATTR_CREATE);
+                                 XATTR_CREATE, filler->stbuf);
         if (ret < 0) {
                 errno = -ret;
                 return -1;
@@ -1541,6 +1549,7 @@ posix_entry_create_xattr_set (xlator_t *this, const char *path,
 
         filler.this = this;
         filler.real_path = path;
+        filler.stbuf = NULL;
 
         ret = dict_foreach (dict, _handle_entry_create_keyvalue_pair, &filler);
 
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index 9da1cda3411..f7acb9e222a 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -3226,7 +3226,7 @@ _handle_setxattr_keyvalue_pair (dict_t *d, char *k, data_t *v,
         filler = tmp;
 
         return posix_handle_pair (filler->this, filler->real_path, k, v,
-                                  filler->flags);
+                                  filler->flags, filler->stbuf);
 }
 
 #ifdef GF_DARWIN_HOST_OS
@@ -3300,6 +3300,8 @@ posix_setxattr (call_frame_t *frame, xlator_t *this,
                 goto out;
         }
 
+        posix_pstat(this, loc->gfid, real_path, &stbuf);
+
         op_ret = -1;
 
         dict_del (dict, GFID_XATTR_KEY);
@@ -3307,6 +3309,8 @@ posix_setxattr (call_frame_t *frame, xlator_t *this,
 
         filler.real_path = real_path;
         filler.this = this;
+        filler.stbuf = &stbuf;
+
 #ifdef GF_DARWIN_HOST_OS
         filler.flags = map_xattr_flags(flags);
 #else
@@ -4464,7 +4468,7 @@ _handle_fsetxattr_keyvalue_pair (dict_t *d, char *k, data_t *v,
         filler = tmp;
 
         return posix_fhandle_pair (filler->this, filler->fdnum, k, v,
-                                   filler->flags);
+                                   filler->flags, filler->stbuf);
 }
 
 int32_t
@@ -4497,11 +4501,14 @@ posix_fsetxattr (call_frame_t *frame, xlator_t *this,
         }
         _fd = pfd->fd;
 
+        posix_fdstat (this, pfd->fd, &stbuf);
+
         dict_del (dict, GFID_XATTR_KEY);
         dict_del (dict, GF_XATTR_VOL_ID_KEY);
 
         filler.fdnum = _fd;
         filler.this = this;
+        filler.stbuf = &stbuf;
 #ifdef GF_DARWIN_HOST_OS
         filler.flags = map_xattr_flags(flags);
 #else
diff --git a/xlators/storage/posix/src/posix.h b/xlators/storage/posix/src/posix.h
index cc7ed0402fe..27006ff3beb 100644
--- a/xlators/storage/posix/src/posix.h
+++ b/xlators/storage/posix/src/posix.h
@@ -202,9 +202,9 @@ int posix_pstat (xlator_t *this, uuid_t gfid, const char *real_path,
 dict_t *posix_xattr_fill (xlator_t *this, const char *path, loc_t *loc,
                           fd_t *fd, int fdnum, dict_t *xattr, struct iatt *buf);
 int posix_handle_pair (xlator_t *this, const char *real_path, char *key,
-                       data_t *value, int flags);
+                       data_t *value, int flags, struct iatt *stbuf);
 int posix_fhandle_pair (xlator_t *this, int fd, char *key, data_t *value,
-                        int flags);
+                        int flags, struct iatt *stbuf);
 void posix_spawn_janitor_thread (xlator_t *this);
 int posix_get_file_contents (xlator_t *this, uuid_t pargfid,
                              const char *name, char **contents);