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authorVenky Shankar <vshankar@redhat.com>2012-02-21 14:23:13 +0530
committerVijay Bellur <vijay@gluster.com>2012-02-22 23:19:44 -0800
commit5842656feba99a239b922f8099fb336c66b61929 (patch)
tree449394308a3db029e73ab4e907ca10b57278b02f /xlators/cluster/dht/src/dht-common.c
parent7820f7563aff8e1a5e73eb75adc387635a301b6e (diff)
Introduce new extended attribute: node-uuid
Request for trusted.glusterfs.node-uuid returns pathinfo like string but containing the UUID of glusterd instead of the backend path for the requested file. This info is benificial for tasks like parallel rebalance that will make use of the UUID for data locality. Change-Id: I766a09cc4a5f63aebd11c73107924a1b29242dcf BUG: 772610 Signed-off-by: Venky Shankar <vshankar@redhat.com> Reviewed-on: http://review.gluster.com/2614 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Shishir Gowda <shishirng@gluster.com> Reviewed-by: Vijay Bellur <vijay@gluster.com>
Diffstat (limited to 'xlators/cluster/dht/src/dht-common.c')
-rw-r--r--xlators/cluster/dht/src/dht-common.c121
1 files changed, 70 insertions, 51 deletions
diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index 377f44b..0d0df32 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -1629,8 +1629,27 @@ fill_layout_info (dht_layout_t *layout, char *buf)
}
}
+void
+dht_fill_pathinfo_xattr (xlator_t *this, dht_local_t *local,
+ char *xattr_buf, int32_t alloc_len,
+ int flag, char *layout_buf)
+{
+ if (flag && local->xattr_val)
+ snprintf (xattr_buf, alloc_len,
+ "((<"DHT_PATHINFO_HEADER"%s> %s) (%s-layout %s))",
+ this->name, local->xattr_val, this->name,
+ layout_buf);
+ else if (local->xattr_val)
+ snprintf (xattr_buf, alloc_len,
+ "(<"DHT_PATHINFO_HEADER"%s> %s)",
+ this->name, local->xattr_val);
+ else if (flag)
+ snprintf (xattr_buf, alloc_len, "(%s-layout %s)",
+ this->name, layout_buf);
+}
+
int
-dht_pathinfo_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+dht_vgetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int op_ret, int op_errno, dict_t *xattr)
{
dht_local_t *local = NULL;
@@ -1647,31 +1666,36 @@ dht_pathinfo_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
local = frame->local;
if (op_ret != -1) {
- ret = dict_get_str (xattr, GF_XATTR_PATHINFO_KEY, &value_got);
+ ret = dict_get_str (xattr, local->xsel, &value_got);
if (!ret) {
alloc_len = strlen (value_got);
/**
- * allocate the buffer:- we allocate 10 bytes extra in case we need to
- * append ' Link: ' in the buffer for another STACK_WIND
+ * allocate the buffer:- we allocate 10 bytes extra in
+ * case we need to append ' Link: ' in the buffer for
+ * another STACK_WIND
*/
- if (!local->pathinfo) {
+ if (!local->xattr_val) {
alloc_len += (strlen (DHT_PATHINFO_HEADER) + 10);
- local->pathinfo = GF_CALLOC (alloc_len, sizeof (char), gf_common_mt_char);
+ local->xattr_val =
+ GF_CALLOC (alloc_len,
+ sizeof (char),
+ gf_common_mt_char);
}
- if (local->pathinfo) {
- plen = strlen (local->pathinfo);
+ if (local->xattr_val) {
+ plen = strlen (local->xattr_val);
if (plen) {
/* extra byte(s) for \0 to be safe */
alloc_len += (plen + 2);
- local->pathinfo = GF_REALLOC (local->pathinfo,
- alloc_len);
- if (!local->pathinfo)
+ local->xattr_val =
+ GF_REALLOC (local->xattr_val,
+ alloc_len);
+ if (!local->xattr_val)
goto out;
}
- strcat (local->pathinfo, value_got);
+ strcat (local->xattr_val, value_got);
}
}
}
@@ -1687,26 +1711,28 @@ dht_pathinfo_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
dict = dict_new ();
- /* we would need max-to-max this many bytes to create pathinfo string */
- alloc_len += (2 * strlen (this->name)) + strlen (layout_buf) + 40;
- xattr_buf = GF_CALLOC (alloc_len, sizeof (char), gf_common_mt_char);
-
- if (flag && local->pathinfo)
- snprintf (xattr_buf, alloc_len, "((<"DHT_PATHINFO_HEADER"%s> %s) (%s-layout %s))",
- this->name, local->pathinfo, this->name,
- layout_buf);
- else if (local->pathinfo)
- snprintf (xattr_buf, alloc_len, "(<"DHT_PATHINFO_HEADER"%s> %s)",
- this->name, local->pathinfo);
- else if (flag)
- snprintf (xattr_buf, alloc_len, "(%s-layout %s)",
- this->name, layout_buf);
+ /* we would need max this many bytes to create xattr string */
+ alloc_len += (2 * strlen (this->name))
+ + strlen (layout_buf)
+ + 40;
+ xattr_buf = GF_CALLOC (alloc_len,
+ sizeof (char), gf_common_mt_char);
+
+ if (XATTR_IS_PATHINFO (local->xsel)) {
+ (void) dht_fill_pathinfo_xattr (this, local, xattr_buf,
+ alloc_len, flag,
+ layout_buf);
+ } else if (XATTR_IS_NODE_UUID (local->xsel)) {
+ (void) snprintf (xattr_buf, alloc_len, "%s",
+ local->xattr_val);
+ } else
+ gf_log (this->name, GF_LOG_WARNING,
+ "Unknown local->xsel (%s)", local->xsel);
- ret = dict_set_dynstr (dict, GF_XATTR_PATHINFO_KEY,
- xattr_buf);
+ ret = dict_set_dynstr (dict, local->xsel, xattr_buf);
- if (local->pathinfo)
- GF_FREE (local->pathinfo);
+ if (local->xattr_val)
+ GF_FREE (local->xattr_val);
DHT_STACK_UNWIND (getxattr, frame, op_ret, op_errno, dict);
@@ -1716,19 +1742,24 @@ dht_pathinfo_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
return 0;
}
- if (local->pathinfo)
- strcat (local->pathinfo, " Link: ");
+ /**
+ * XXX: We will never reach here as call_cnt will always be 1.
+ * But code is kept untouched as we may need it when hashed_subvol
+ * bug is fixed.
+ */
+ if (local->xattr_val)
+ strcat (local->xattr_val, " Link: ");
if (local->hashed_subvol) {
/* This will happen if there pending */
- STACK_WIND (frame, dht_pathinfo_getxattr_cbk, local->hashed_subvol,
+ STACK_WIND (frame, dht_vgetxattr_cbk, local->hashed_subvol,
local->hashed_subvol->fops->getxattr,
&local->loc, local->key);
return 0;
}
- gf_log ("this->name", GF_LOG_ERROR, "Unable to find hashed_subvol for path"
- " %s", local->pathinfo);
+ gf_log ("this->name", GF_LOG_ERROR, "Unable to find hashed_subvol"
+ " for path %s", local->xattr_val);
DHT_STACK_UNWIND (getxattr, frame, -1, op_errno, dict);
return 0;
@@ -1852,25 +1883,13 @@ dht_getxattr (call_frame_t *frame, xlator_t *this,
}
}
- if (key && (strcmp (key, GF_XATTR_PATHINFO_KEY) == 0)) {
- hashed_subvol = dht_subvol_get_hashed (this, loc);
- if (!hashed_subvol) {
- gf_log (this->name, GF_LOG_ERROR,
- "Failed to get hashed_subvol for %s",
- loc->path);
- op_errno = EINVAL;
- goto err;
- }
-
+ if (key && ((strcmp (key, GF_XATTR_PATHINFO_KEY) == 0)
+ || strcmp (key, GF_XATTR_NODE_UUID_KEY) == 0)) {
cached_subvol = local->cached_subvol;
+ (void) strncpy (local->xsel, key, 256);
local->call_cnt = 1;
- if (hashed_subvol != cached_subvol) {
- local->call_cnt = 2;
- local->hashed_subvol = hashed_subvol;
- }
-
- STACK_WIND (frame, dht_pathinfo_getxattr_cbk, cached_subvol,
+ STACK_WIND (frame, dht_vgetxattr_cbk, cached_subvol,
cached_subvol->fops->getxattr, loc, key);
return 0;