btrfs-progs: check: repair inode nlink in lowmem
New function repair_inode_nlinks_lowmem() sets nlink of the inode to refs. If refs equals 0, move the inode to lost+found and set refs to 1 initially. Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue
David Sterba
parent
2194fab071
commit
3cfd3f608c
228
cmds-check.c
228
cmds-check.c
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@ -3018,15 +3018,79 @@ static int get_highest_inode(struct btrfs_trans_handle *trans,
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return ret;
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}
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/*
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* Link inode to dir 'lost+found'. Increase @ref_count.
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*
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* Returns 0 means success.
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* Returns <0 means failure.
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*/
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static int link_inode_to_lostfound(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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u64 ino, char *namebuf, u32 name_len,
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u8 filetype, u64 *ref_count)
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{
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char *dir_name = "lost+found";
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u64 lost_found_ino;
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int ret;
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u32 mode = 0700;
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btrfs_release_path(path);
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ret = get_highest_inode(trans, root, path, &lost_found_ino);
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if (ret < 0)
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goto out;
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lost_found_ino++;
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ret = btrfs_mkdir(trans, root, dir_name, strlen(dir_name),
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BTRFS_FIRST_FREE_OBJECTID, &lost_found_ino,
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mode);
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if (ret < 0) {
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error("failed to create '%s' dir: %s", dir_name, strerror(-ret));
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goto out;
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}
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ret = btrfs_add_link(trans, root, ino, lost_found_ino,
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namebuf, name_len, filetype, NULL, 1, 0);
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/*
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* Add ".INO" suffix several times to handle case where
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* "FILENAME.INO" is already taken by another file.
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*/
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while (ret == -EEXIST) {
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/*
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* Conflicting file name, add ".INO" as suffix * +1 for '.'
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*/
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if (name_len + count_digits(ino) + 1 > BTRFS_NAME_LEN) {
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ret = -EFBIG;
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goto out;
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}
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snprintf(namebuf + name_len, BTRFS_NAME_LEN - name_len,
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".%llu", ino);
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name_len += count_digits(ino) + 1;
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ret = btrfs_add_link(trans, root, ino, lost_found_ino, namebuf,
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name_len, filetype, NULL, 1, 0);
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}
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if (ret < 0) {
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error("failed to link the inode %llu to %s dir: %s",
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ino, dir_name, strerror(-ret));
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goto out;
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}
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++*ref_count;
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printf("Moving file '%.*s' to '%s' dir since it has no valid backref\n",
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name_len, namebuf, dir_name);
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out:
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btrfs_release_path(path);
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if (ret)
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error("failed to move file '%.*s' to '%s' dir", name_len,
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namebuf, dir_name);
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return ret;
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}
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static int repair_inode_nlinks(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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struct inode_record *rec)
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{
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char *dir_name = "lost+found";
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char namebuf[BTRFS_NAME_LEN] = {0};
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u64 lost_found_ino;
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u32 mode = 0700;
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u8 type = 0;
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int namelen = 0;
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int name_recovered = 0;
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@ -3063,55 +3127,11 @@ static int repair_inode_nlinks(struct btrfs_trans_handle *trans,
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}
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if (rec->found_link == 0) {
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ret = get_highest_inode(trans, root, path, &lost_found_ino);
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if (ret < 0)
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ret = link_inode_to_lostfound(trans, root, path, rec->ino,
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namebuf, namelen, type,
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(u64 *)&rec->found_link);
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if (ret)
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goto out;
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lost_found_ino++;
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ret = btrfs_mkdir(trans, root, dir_name, strlen(dir_name),
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BTRFS_FIRST_FREE_OBJECTID, &lost_found_ino,
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mode);
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if (ret < 0) {
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fprintf(stderr, "Failed to create '%s' dir: %s\n",
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dir_name, strerror(-ret));
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goto out;
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}
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ret = btrfs_add_link(trans, root, rec->ino, lost_found_ino,
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namebuf, namelen, type, NULL, 1, 0);
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/*
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* Add ".INO" suffix several times to handle case where
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* "FILENAME.INO" is already taken by another file.
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*/
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while (ret == -EEXIST) {
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/*
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* Conflicting file name, add ".INO" as suffix * +1 for '.'
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*/
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if (namelen + count_digits(rec->ino) + 1 >
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BTRFS_NAME_LEN) {
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ret = -EFBIG;
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goto out;
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}
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snprintf(namebuf + namelen, BTRFS_NAME_LEN - namelen,
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".%llu", rec->ino);
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namelen += count_digits(rec->ino) + 1;
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ret = btrfs_add_link(trans, root, rec->ino,
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lost_found_ino, namebuf,
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namelen, type, NULL, 1, 0);
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}
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if (ret < 0) {
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fprintf(stderr,
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"Failed to link the inode %llu to %s dir: %s\n",
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rec->ino, dir_name, strerror(-ret));
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goto out;
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}
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/*
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* Just increase the found_link, don't actually add the
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* backref. This will make things easier and this inode
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* record will be freed after the repair is done.
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* So fsck will not report problem about this inode.
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*/
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rec->found_link++;
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printf("Moving file '%.*s' to '%s' dir since it has no valid backref\n",
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namelen, namebuf, dir_name);
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}
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printf("Fixed the nlink of inode %llu\n", rec->ino);
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out:
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@ -5592,6 +5612,92 @@ out:
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return err;
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}
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/* Set inode_item nlink to @ref_count.
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* If @ref_count == 0, move it to "lost+found" and increase @ref_count.
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*
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* Returns 0 on success
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*/
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static int repair_inode_nlinks_lowmem(struct btrfs_root *root,
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struct btrfs_path *path, u64 ino,
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const char *name, u32 namelen,
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u64 ref_count, u8 filetype, u64 *nlink)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_inode_item *ii;
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struct btrfs_key key;
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struct btrfs_key old_key;
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char namebuf[BTRFS_NAME_LEN] = {0};
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int name_len;
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int ret;
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int ret2;
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/* save the key */
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btrfs_item_key_to_cpu(path->nodes[0], &old_key, path->slots[0]);
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if (name && namelen) {
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ASSERT(namelen <= BTRFS_NAME_LEN);
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memcpy(namebuf, name, namelen);
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name_len = namelen;
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} else {
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sprintf(namebuf, "%llu", ino);
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name_len = count_digits(ino);
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printf("Can't find file name for inode %llu, use %s instead\n",
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ino, namebuf);
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}
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trans = btrfs_start_transaction(root, 1);
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if (IS_ERR(trans)) {
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ret = PTR_ERR(trans);
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goto out;
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}
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btrfs_release_path(path);
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/* if refs is 0, put it into lostfound */
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if (ref_count == 0) {
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ret = link_inode_to_lostfound(trans, root, path, ino, namebuf,
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name_len, filetype, &ref_count);
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if (ret)
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goto fail;
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}
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/* reset inode_item's nlink to ref_count */
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key.objectid = ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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btrfs_release_path(path);
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ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
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if (ret > 0)
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ret = -ENOENT;
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if (ret)
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goto fail;
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ii = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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btrfs_set_inode_nlink(path->nodes[0], ii, ref_count);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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if (nlink)
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*nlink = ref_count;
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fail:
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btrfs_commit_transaction(trans, root);
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out:
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if (ret)
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error(
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"fail to repair nlink of inode %llu root %llu name %s filetype %u",
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root->objectid, ino, namebuf, filetype);
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else
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printf("Fixed nlink of inode %llu root %llu name %s filetype %u\n",
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root->objectid, ino, namebuf, filetype);
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/* research */
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btrfs_release_path(path);
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ret2 = btrfs_search_slot(NULL, root, &old_key, path, 0, 0);
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if (ret2 < 0)
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return ret |= ret2;
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return ret;
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}
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/*
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* Check INODE_ITEM and related ITEMs (the same inode number)
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* 1. check link count
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@ -5715,6 +5821,13 @@ out:
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err &= ~DIR_COUNT_AGAIN;
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count_dir_isize(root, inode_id, &size);
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}
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if ((nlink != 1 || refs != 1) && repair) {
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ret = repair_inode_nlinks_lowmem(root, path, inode_id,
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namebuf, name_len, refs, imode_to_type(mode),
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&nlink);
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}
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if (nlink != 1) {
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err |= LINK_COUNT_ERROR;
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error("root %llu DIR INODE[%llu] shouldn't have more than one link(%llu)",
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@ -5744,9 +5857,16 @@ out:
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}
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} else {
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if (nlink != refs) {
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err |= LINK_COUNT_ERROR;
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error("root %llu INODE[%llu] nlink(%llu) not equal to inode_refs(%llu)",
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root->objectid, inode_id, nlink, refs);
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if (repair)
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ret = repair_inode_nlinks_lowmem(root, path,
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inode_id, namebuf, name_len, refs,
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imode_to_type(mode), &nlink);
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if (!repair || ret) {
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err |= LINK_COUNT_ERROR;
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error(
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"root %llu INODE[%llu] nlink(%llu) not equal to inode_refs(%llu)",
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root->objectid, inode_id, nlink, refs);
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}
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} else if (!nlink) {
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if (repair)
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ret = repair_inode_orphan_item_lowmem(root,
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