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authorAmar Tumballi <amar@gluster.com>2011-07-01 04:42:14 +0000
committerAnand Avati <avati@gluster.com>2011-07-14 01:01:50 -0700
commit7f4f7765597a7f0daa5bca7c3bcb2479d7ed15bc (patch)
tree19693d483fdde70a320a9ed04486848e26131ad5 /xlators/mgmt/glusterd/src/glusterd-rebalance.c
parent8d18bc22d1cfc8a481bc8d20da5843c65b567226 (diff)
glusterd-rebalance: utilize distribute's internal rebalance feature
Signed-off-by: Amar Tumballi <amar@gluster.com> Signed-off-by: Anand Avati <avati@gluster.com> BUG: 3070 (After 'rebalance', the gfid of the file gets changed) URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=3070
Diffstat (limited to 'xlators/mgmt/glusterd/src/glusterd-rebalance.c')
-rw-r--r--xlators/mgmt/glusterd/src/glusterd-rebalance.c189
1 files changed, 16 insertions, 173 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-rebalance.c b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
index 47ffb95..a91c46f 100644
--- a/xlators/mgmt/glusterd/src/glusterd-rebalance.c
+++ b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
@@ -45,77 +45,17 @@
#include "syscall.h"
#include "cli1.h"
-#define GF_DISK_SECTOR_SIZE 512
-
-static int
-write_with_holes (int fd, const char *buf, int size, off_t offset)
-{
- int ret = -1;
- int start_idx = 0;
- int tmp_offset = 0;
- int write_needed = 0;
-
- for (start_idx = 0; (start_idx + GF_DISK_SECTOR_SIZE) <= size;
- start_idx += GF_DISK_SECTOR_SIZE) {
- /* Check if a block has full '0's. assume as hole if true */
- if (mem_0filled (buf + start_idx, GF_DISK_SECTOR_SIZE) == 0) {
- write_needed = 1;
- continue;
- }
-
- if (write_needed) {
- ret = write (fd, buf + tmp_offset,
- (start_idx - tmp_offset));
- if (ret < 0)
- goto out;
-
- write_needed = 0;
- }
- tmp_offset = start_idx + GF_DISK_SECTOR_SIZE;
-
- ret = lseek (fd, (offset + tmp_offset), SEEK_SET);
- if (ret < 0)
- goto out;
- }
-
- if ((start_idx < size) || write_needed) {
- /* This means, last chunk is not yet written.. write it */
- ret = write (fd, buf + tmp_offset, (size - tmp_offset));
- if (ret < 0)
- goto out;
- }
-
- /* do it regardless of all the above cases as we had to 'write' the
- given number of bytes */
- ret = ftruncate (fd, offset + size);
- if (ret)
- goto out;
-
- ret = 0;
-out:
- return ret;
-
-}
int
gf_glusterd_rebalance_move_data (glusterd_volinfo_t *volinfo, const char *dir)
{
int ret = -1;
- int dst_fd = -1;
- int src_fd = -1;
DIR *fd = NULL;
glusterd_defrag_info_t *defrag = NULL;
struct dirent *entry = NULL;
struct stat stbuf = {0,};
- struct stat new_stbuf = {0,};
char full_path[PATH_MAX] = {0,};
- char tmp_filename[PATH_MAX] = {0,};
- char value[16] = {0,};
- char linkinfo[PATH_MAX] = {0,};
- struct statvfs src_statfs = {0,};
- struct statvfs dst_statfs = {0,};
- int file_has_holes = 0;
- off_t offset = 0;
+ char force_string[64] = {0,};
if (!volinfo->defrag)
goto out;
@@ -125,6 +65,13 @@ gf_glusterd_rebalance_move_data (glusterd_volinfo_t *volinfo, const char *dir)
fd = opendir (dir);
if (!fd)
goto out;
+
+ if (defrag->cmd == GF_DEFRAG_CMD_START_MIGRATE_DATA_FORCE) {
+ strcpy (force_string, "force");
+ } else {
+ strcpy (force_string, "not-force");
+ }
+
while ((entry = readdir (fd))) {
if (!entry)
break;
@@ -146,121 +93,17 @@ gf_glusterd_rebalance_move_data (glusterd_volinfo_t *volinfo, const char *dir)
if (stbuf.st_nlink > 1)
continue;
- /* if distribute is present, it will honor this key.
- -1 is returned if distribute is not present or file doesn't
- have a link-file. If file has link-file, the path of
- link-file will be the value */
- ret = sys_lgetxattr (full_path, GF_XATTR_LINKINFO_KEY,
- &linkinfo, PATH_MAX);
- if (ret <= 0)
- continue;
-
- /* If the file is open, don't run rebalance on it */
- ret = sys_lgetxattr (full_path, GLUSTERFS_OPEN_FD_COUNT,
- &value, 16);
- if ((ret < 0) || !strncmp (value, "1", 1))
- continue;
-
- /* If its a regular file, and sticky bit is set, we need to
- rebalance that */
- snprintf (tmp_filename, PATH_MAX, "%s/.%s.gfs%llu", dir,
- entry->d_name,
- (unsigned long long)stbuf.st_size);
-
- dst_fd = creat (tmp_filename, stbuf.st_mode);
- if (dst_fd == -1)
- continue;
-
- /* Prevent data movement from a node which has higher
- disk-space to a node with lesser */
- if (defrag->cmd != GF_DEFRAG_CMD_START_MIGRATE_DATA_FORCE) {
- ret = statvfs (full_path, &src_statfs);
- if (ret)
- gf_log ("", GF_LOG_WARNING,
- "statfs on %s failed", full_path);
-
- ret = statvfs (tmp_filename, &dst_statfs);
- if (ret)
- gf_log ("", GF_LOG_WARNING,
- "statfs on %s failed", tmp_filename);
-
- /* Calculate the size without the file in migration */
- if (((dst_statfs.f_bavail *
- dst_statfs.f_bsize) / GF_DISK_SECTOR_SIZE) >
- (((src_statfs.f_bavail * src_statfs.f_bsize) /
- GF_DISK_SECTOR_SIZE) - stbuf.st_blocks)) {
- gf_log ("", GF_LOG_INFO,
- "data movement attempted from node with"
- " higher disk space to a node with "
- "lesser disk space (%s)", full_path);
-
- close (dst_fd);
- unlink (tmp_filename);
- continue;
- }
- }
-
- src_fd = open (full_path, O_RDONLY);
- if (src_fd == -1) {
- close (dst_fd);
- continue;
- }
-
- /* Try to preserve 'holes' while migrating data */
- if (stbuf.st_size > (stbuf.st_blocks * GF_DISK_SECTOR_SIZE))
- file_has_holes = 1;
-
- offset = 0;
- while (1) {
- ret = read (src_fd, defrag->databuf, 128 * GF_UNIT_KB);
- if (!ret || (ret < 0)) {
- break;
- }
-
- if (!file_has_holes)
- ret = write (dst_fd, defrag->databuf, ret);
- else
- ret = write_with_holes (dst_fd, defrag->databuf,
- ret, offset);
- if (ret < 0)
- break;
-
- offset += ret;
- }
-
- ret = stat (full_path, &new_stbuf);
- if (ret < 0) {
- close (dst_fd);
- close (src_fd);
- continue;
- }
- /* No need to rebalance, if there is some
- activity on source file */
- if (new_stbuf.st_mtime != stbuf.st_mtime) {
- close (dst_fd);
- close (src_fd);
+ ret = sys_lsetxattr (full_path, "distribute.migrate-data",
+ force_string, strlen (force_string), 0);
+ if (ret < 0)
continue;
- }
- ret = fchown (dst_fd, stbuf.st_uid, stbuf.st_gid);
- if (ret) {
- gf_log ("", GF_LOG_WARNING,
- "failed to set the uid/gid of file %s: %s",
- tmp_filename, strerror (errno));
- }
-
- ret = rename (tmp_filename, full_path);
- if (ret != -1) {
- LOCK (&defrag->lock);
- {
- defrag->total_files += 1;
- defrag->total_data += stbuf.st_size;
- }
- UNLOCK (&defrag->lock);
+ LOCK (&defrag->lock);
+ {
+ defrag->total_files += 1;
+ defrag->total_data += stbuf.st_size;
}
-
- close (dst_fd);
- close (src_fd);
+ UNLOCK (&defrag->lock);
if (volinfo->defrag_status == GF_DEFRAG_STATUS_STOPED) {
closedir (fd);