diff options
Diffstat (limited to 'xlators/cluster/dht/src/dht-helper.c')
| -rw-r--r-- | xlators/cluster/dht/src/dht-helper.c | 86 |
1 files changed, 70 insertions, 16 deletions
diff --git a/xlators/cluster/dht/src/dht-helper.c b/xlators/cluster/dht/src/dht-helper.c index ac70a665094..472abc1cf68 100644 --- a/xlators/cluster/dht/src/dht-helper.c +++ b/xlators/cluster/dht/src/dht-helper.c @@ -1108,6 +1108,7 @@ dht_migration_complete_check_task (void *data) dht_conf_t *conf = NULL; inode_t *inode = NULL; fd_t *iter_fd = NULL; + fd_t *tmp = NULL; uint64_t tmp_miginfo = 0; dht_migrate_info_t *miginfo = NULL; int open_failed = 0; @@ -1230,27 +1231,46 @@ dht_migration_complete_check_task (void *data) goto out; } + /* perform 'open()' on all the fd's present on the inode */ + if (tmp_loc.path == NULL) { + inode_path (inode, NULL, &path); + if (path) + tmp_loc.path = path; + } + + LOCK(&inode->lock); + if (list_empty (&inode->fd_list)) - goto out; + goto unlock; /* perform open as root:root. There is window between linkfile * creation(root:root) and setattr with the correct uid/gid */ SYNCTASK_SETID(0, 0); - /* perform 'open()' on all the fd's present on the inode */ - tmp_loc.inode = inode; - inode_path (inode, NULL, &path); - if (path) - tmp_loc.path = path; - - list_for_each_entry (iter_fd, &inode->fd_list, inode_list) { + /* It's possible that we are the last user of iter_fd after each + * iteration. In this case the fd_unref() of iter_fd at the end of + * the loop will cause the destruction of the fd. So we need to + * iterate the list safely because iter_fd cannot be trusted. + */ + list_for_each_entry_safe (iter_fd, tmp, &inode->fd_list, inode_list) { if (fd_is_anonymous (iter_fd)) continue; + if (dht_fd_open_on_dst (this, iter_fd, dst_node)) continue; + /* We need to release the inode->lock before calling + * syncop_open() to avoid possible deadlocks. However this + * can cause the iter_fd to be released by other threads. + * To avoid this, we take a reference before releasing the + * lock. + */ + __fd_ref(iter_fd); + + UNLOCK(&inode->lock); + /* flags for open are stripped down to allow following the * new location of the file, otherwise we can get EEXIST or * truncate the file again as rebalance is moving the data */ @@ -1272,15 +1292,23 @@ dht_migration_complete_check_task (void *data) } else { dht_fd_ctx_set (this, iter_fd, dst_node); } + + fd_unref(iter_fd); + + LOCK(&inode->lock); } SYNCTASK_SETID (frame->root->uid, frame->root->gid); if (open_failed) { ret = -1; - goto out; + goto unlock; } ret = 0; + +unlock: + UNLOCK(&inode->lock); + out: loc_wipe (&tmp_loc); @@ -1353,6 +1381,7 @@ dht_rebalance_inprogress_task (void *data) dht_conf_t *conf = NULL; inode_t *inode = NULL; fd_t *iter_fd = NULL; + fd_t *tmp = NULL; int open_failed = 0; uint64_t tmp_miginfo = 0; dht_migrate_info_t *miginfo = NULL; @@ -1463,24 +1492,44 @@ dht_rebalance_inprogress_task (void *data) ret = 0; + if (tmp_loc.path == NULL) { + inode_path (inode, NULL, &path); + if (path) + tmp_loc.path = path; + } + + LOCK(&inode->lock); + if (list_empty (&inode->fd_list)) - goto done; + goto unlock; /* perform open as root:root. There is window between linkfile * creation(root:root) and setattr with the correct uid/gid */ SYNCTASK_SETID (0, 0); - inode_path (inode, NULL, &path); - if (path) - tmp_loc.path = path; - - list_for_each_entry (iter_fd, &inode->fd_list, inode_list) { + /* It's possible that we are the last user of iter_fd after each + * iteration. In this case the fd_unref() of iter_fd at the end of + * the loop will cause the destruction of the fd. So we need to + * iterate the list safely because iter_fd cannot be trusted. + */ + list_for_each_entry_safe (iter_fd, tmp, &inode->fd_list, inode_list) { if (fd_is_anonymous (iter_fd)) continue; if (dht_fd_open_on_dst (this, iter_fd, dst_node)) continue; + + /* We need to release the inode->lock before calling + * syncop_open() to avoid possible deadlocks. However this + * can cause the iter_fd to be released by other threads. + * To avoid this, we take a reference before releasing the + * lock. + */ + __fd_ref(iter_fd); + + UNLOCK(&inode->lock); + /* flags for open are stripped down to allow following the * new location of the file, otherwise we can get EEXIST or * truncate the file again as rebalance is moving the data */ @@ -1503,16 +1552,21 @@ dht_rebalance_inprogress_task (void *data) dht_fd_ctx_set (this, iter_fd, dst_node); } + fd_unref(iter_fd); + + LOCK(&inode->lock); } SYNCTASK_SETID (frame->root->uid, frame->root->gid); +unlock: + UNLOCK(&inode->lock); + if (open_failed) { ret = -1; goto out; } -done: ret = dht_inode_ctx_set_mig_info (this, inode, src_node, dst_node); if (ret) { gf_msg (this->name, GF_LOG_ERROR, 0, |