diff options
Diffstat (limited to 'check/common.c')
-rw-r--r-- | check/common.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/check/common.c b/check/common.c index 6a7d86df..9051936a 100644 --- a/check/common.c +++ b/check/common.c @@ -19,6 +19,7 @@ #include "internal.h" #include "messages.h" #include "transaction.h" +#include "utils.h" #include "check/common.h" /* @@ -144,3 +145,95 @@ int insert_inode_item(struct btrfs_trans_handle *trans, return 0; } + +static int get_highest_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct btrfs_path *path, + u64 *highest_ino) +{ + struct btrfs_key key, found_key; + int ret; + + btrfs_init_path(path); + key.objectid = BTRFS_LAST_FREE_OBJECTID; + key.offset = -1; + key.type = BTRFS_INODE_ITEM_KEY; + ret = btrfs_search_slot(trans, root, &key, path, -1, 1); + if (ret == 1) { + btrfs_item_key_to_cpu(path->nodes[0], &found_key, + path->slots[0] - 1); + *highest_ino = found_key.objectid; + ret = 0; + } + if (*highest_ino >= BTRFS_LAST_FREE_OBJECTID) + ret = -EOVERFLOW; + btrfs_release_path(path); + return ret; +} + +/* + * Link inode to dir 'lost+found'. Increase @ref_count. + * + * Returns 0 means success. + * Returns <0 means failure. + */ +int link_inode_to_lostfound(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + u64 ino, char *namebuf, u32 name_len, + u8 filetype, u64 *ref_count) +{ + char *dir_name = "lost+found"; + u64 lost_found_ino; + int ret; + u32 mode = 0700; + + btrfs_release_path(path); + ret = get_highest_inode(trans, root, path, &lost_found_ino); + if (ret < 0) + goto out; + lost_found_ino++; + + ret = btrfs_mkdir(trans, root, dir_name, strlen(dir_name), + BTRFS_FIRST_FREE_OBJECTID, &lost_found_ino, + mode); + if (ret < 0) { + error("failed to create '%s' dir: %s", dir_name, strerror(-ret)); + goto out; + } + ret = btrfs_add_link(trans, root, ino, lost_found_ino, + namebuf, name_len, filetype, NULL, 1, 0); + /* + * Add ".INO" suffix several times to handle case where + * "FILENAME.INO" is already taken by another file. + */ + while (ret == -EEXIST) { + /* + * Conflicting file name, add ".INO" as suffix * +1 for '.' + */ + if (name_len + count_digits(ino) + 1 > BTRFS_NAME_LEN) { + ret = -EFBIG; + goto out; + } + snprintf(namebuf + name_len, BTRFS_NAME_LEN - name_len, + ".%llu", ino); + name_len += count_digits(ino) + 1; + ret = btrfs_add_link(trans, root, ino, lost_found_ino, namebuf, + name_len, filetype, NULL, 1, 0); + } + if (ret < 0) { + error("failed to link the inode %llu to %s dir: %s", + ino, dir_name, strerror(-ret)); + goto out; + } + + ++*ref_count; + printf("Moving file '%.*s' to '%s' dir since it has no valid backref\n", + name_len, namebuf, dir_name); +out: + btrfs_release_path(path); + if (ret) + error("failed to move file '%.*s' to '%s' dir", name_len, + namebuf, dir_name); + return ret; +} + |