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authorAmar Tumballi <amar@gluster.com>2011-07-19 20:26:52 +0530
committerAnand Avati <avati@gluster.com>2011-07-22 02:51:18 -0700
commitb127d0fd7b6c452d3f355c3fc11b068c55b0d457 (patch)
tree740de4b6d2aaca4ae1df0dcfad261d7d8b008458
parent009b05411ca399deed3045acdc93116ebab029c4 (diff)
glusterd rebalance: handle the write failure properly
also, make sure the sizes are same before renaming the target file to the original file, hence prevent a possible data-loss. Change-Id: Ie88224ba62a4604f8c0149f84fa462abfbd6ad78 BUG: 3193 Reviewed-on: http://review.gluster.com/27 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@gluster.com>
-rw-r--r--xlators/mgmt/glusterd/src/glusterd-rebalance.c63
1 files changed, 53 insertions, 10 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-rebalance.c b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
index 58e56f1..6e478b0 100644
--- a/xlators/mgmt/glusterd/src/glusterd-rebalance.c
+++ b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
@@ -105,10 +105,12 @@ gf_glusterd_rebalance_move_data (glusterd_volinfo_t *volinfo, const char *dir)
struct dirent *entry = NULL;
struct stat stbuf = {0,};
struct stat new_stbuf = {0,};
+ struct stat dst_stbuf = {0,};
char full_path[PATH_MAX] = {0,};
char tmp_filename[PATH_MAX] = {0,};
char value[16] = {0,};
char linkinfo[PATH_MAX] = {0,};
+ char file_not_copied_fully = 0;
if (!volinfo->defrag)
goto out;
@@ -172,24 +174,25 @@ gf_glusterd_rebalance_move_data (glusterd_volinfo_t *volinfo, const char *dir)
while (1) {
ret = read (src_fd, defrag->databuf, 131072);
- if (!ret || (ret < 0)) {
+ if (ret < 0) {
+ file_not_copied_fully = 1;
break;
}
+ /* If EOF is hit, then we get 'ret == 0' */
+ if (!ret)
+ break;
+
ret = write (dst_fd, defrag->databuf, ret);
if (ret < 0) {
+ file_not_copied_fully = 1;
break;
}
}
- ret = lstat (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) {
+ if (file_not_copied_fully) {
+ gf_log (THIS->name, GF_LOG_WARNING,
+ "failed to copy the file fully : %s (%s)",
+ full_path, strerror (errno));
close (dst_fd);
close (src_fd);
continue;
@@ -209,6 +212,46 @@ gf_glusterd_rebalance_move_data (glusterd_volinfo_t *volinfo, const char *dir)
tmp_filename, strerror (errno));
}
+ ret = fstat (src_fd, &new_stbuf);
+ if (ret < 0) {
+ gf_log (THIS->name, GF_LOG_WARNING,
+ "failed to get stat: %s (%s)",
+ full_path, strerror (errno));
+ close (dst_fd);
+ close (src_fd);
+ continue;
+ }
+
+ ret = fstat (dst_fd, &dst_stbuf);
+ if (ret < 0) {
+ gf_log (THIS->name, GF_LOG_WARNING,
+ "failed to get stat on temp file: %s (%s)",
+ tmp_filename, strerror (errno));
+ 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) {
+ gf_log (THIS->name, GF_LOG_WARNING,
+ "file got changed after we started copying %s",
+ full_path);
+ close (dst_fd);
+ close (src_fd);
+ continue;
+ }
+
+ if (new_stbuf.st_size != dst_stbuf.st_size) {
+ gf_log (THIS->name, GF_LOG_WARNING,
+ "file sizes are not same : %s",
+ full_path);
+ close (dst_fd);
+ close (src_fd);
+ continue;
+ }
+
ret = rename (tmp_filename, full_path);
if (ret != -1) {
LOCK (&defrag->lock);