diff options
Diffstat (limited to 'ubifs-utils/libubifs')
| -rw-r--r-- | ubifs-utils/libubifs/journal.c | 1497 |
1 files changed, 4 insertions, 1493 deletions
diff --git a/ubifs-utils/libubifs/journal.c b/ubifs-utils/libubifs/journal.c index 4590d61..37dc3f0 100644 --- a/ubifs-utils/libubifs/journal.c +++ b/ubifs-utils/libubifs/journal.c @@ -46,7 +46,11 @@ * all the nodes. */ +#include "bitops.h" #include "ubifs.h" +#include "defs.h" +#include "debug.h" +#include "misc.h" /** * zero_ino_node_unused - zero out unused fields of an on-flash inode node. @@ -68,16 +72,6 @@ static inline void zero_dent_node_unused(struct ubifs_dent_node *dent) dent->padding1 = 0; } -/** - * zero_trun_node_unused - zero out unused fields of an on-flash truncation - * node. - * @trun: the truncation node to zero out - */ -static inline void zero_trun_node_unused(struct ubifs_trun_node *trun) -{ - memset(trun->padding, 0, 12); -} - static void ubifs_add_auth_dirt(struct ubifs_info *c, int lnum) { if (ubifs_authenticated(c)) @@ -436,70 +430,6 @@ static int get_dent_type(int mode) return 0; } -/** - * pack_inode - pack an inode node. - * @c: UBIFS file-system description object - * @ino: buffer in which to pack inode node - * @inode: inode to pack - * @last: indicates the last node of the group - */ -static void pack_inode(struct ubifs_info *c, struct ubifs_ino_node *ino, - const struct inode *inode, int last) -{ - int data_len = 0, last_reference = !inode->i_nlink; - struct ubifs_inode *ui = ubifs_inode(inode); - - ino->ch.node_type = UBIFS_INO_NODE; - ino_key_init_flash(c, &ino->key, inode->i_ino); - ino->creat_sqnum = cpu_to_le64(ui->creat_sqnum); - ino->atime_sec = cpu_to_le64(inode_get_atime_sec(inode)); - ino->atime_nsec = cpu_to_le32(inode_get_atime_nsec(inode)); - ino->ctime_sec = cpu_to_le64(inode_get_ctime_sec(inode)); - ino->ctime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode)); - ino->mtime_sec = cpu_to_le64(inode_get_mtime_sec(inode)); - ino->mtime_nsec = cpu_to_le32(inode_get_mtime_nsec(inode)); - ino->uid = cpu_to_le32(i_uid_read(inode)); - ino->gid = cpu_to_le32(i_gid_read(inode)); - ino->mode = cpu_to_le32(inode->i_mode); - ino->flags = cpu_to_le32(ui->flags); - ino->size = cpu_to_le64(ui->ui_size); - ino->nlink = cpu_to_le32(inode->i_nlink); - ino->compr_type = cpu_to_le16(ui->compr_type); - ino->data_len = cpu_to_le32(ui->data_len); - ino->xattr_cnt = cpu_to_le32(ui->xattr_cnt); - ino->xattr_size = cpu_to_le32(ui->xattr_size); - ino->xattr_names = cpu_to_le32(ui->xattr_names); - zero_ino_node_unused(ino); - - /* - * Drop the attached data if this is a deletion inode, the data is not - * needed anymore. - */ - if (!last_reference) { - memcpy(ino->data, ui->data, ui->data_len); - data_len = ui->data_len; - } - - ubifs_prep_grp_node(c, ino, UBIFS_INO_NODE_SZ + data_len, last); -} - -/** - * mark_inode_clean - mark UBIFS inode as clean. - * @c: UBIFS file-system description object - * @ui: UBIFS inode to mark as clean - * - * This helper function marks UBIFS inode @ui as clean by cleaning the - * @ui->dirty flag and releasing its budget. Note, VFS may still treat the - * inode as dirty and try to write it back, but 'ubifs_write_inode()' would - * just do nothing. - */ -static void mark_inode_clean(struct ubifs_info *c, struct ubifs_inode *ui) -{ - if (ui->dirty) - ubifs_release_dirty_inode_budget(c, ui); - ui->dirty = 0; -} - static void set_dent_cookie(struct ubifs_info *c, struct ubifs_dent_node *dent) { if (c->double_hash) @@ -507,1422 +437,3 @@ static void set_dent_cookie(struct ubifs_info *c, struct ubifs_dent_node *dent) else dent->cookie = 0; } - -/** - * ubifs_jnl_update - update inode. - * @c: UBIFS file-system description object - * @dir: parent inode or host inode in case of extended attributes - * @nm: directory entry name - * @inode: inode to update - * @deletion: indicates a directory entry deletion i.e unlink or rmdir - * @xent: non-zero if the directory entry is an extended attribute entry - * @in_orphan: indicates whether the @inode is in orphan list - * - * This function updates an inode by writing a directory entry (or extended - * attribute entry), the inode itself, and the parent directory inode (or the - * host inode) to the journal. - * - * The function writes the host inode @dir last, which is important in case of - * extended attributes. Indeed, then we guarantee that if the host inode gets - * synchronized (with 'fsync()'), and the write-buffer it sits in gets flushed, - * the extended attribute inode gets flushed too. And this is exactly what the - * user expects - synchronizing the host inode synchronizes its extended - * attributes. Similarly, this guarantees that if @dir is synchronized, its - * directory entry corresponding to @nm gets synchronized too. - * - * If the inode (@inode) or the parent directory (@dir) are synchronous, this - * function synchronizes the write-buffer. - * - * This function marks the @dir and @inode inodes as clean and returns zero on - * success. In case of failure, a negative error code is returned. - */ -int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir, - const struct fscrypt_name *nm, const struct inode *inode, - int deletion, int xent, int in_orphan) -{ - int err, dlen, ilen, len, lnum, ino_offs, dent_offs, orphan_added = 0; - int aligned_dlen, aligned_ilen, sync = IS_DIRSYNC(dir); - int last_reference = !!(deletion && inode->i_nlink == 0); - struct ubifs_inode *ui = ubifs_inode(inode); - struct ubifs_inode *host_ui = ubifs_inode(dir); - struct ubifs_dent_node *dent; - struct ubifs_ino_node *ino; - union ubifs_key dent_key, ino_key; - u8 hash_dent[UBIFS_HASH_ARR_SZ]; - u8 hash_ino[UBIFS_HASH_ARR_SZ]; - u8 hash_ino_host[UBIFS_HASH_ARR_SZ]; - - ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex)); - - dlen = UBIFS_DENT_NODE_SZ + fname_len(nm) + 1; - ilen = UBIFS_INO_NODE_SZ; - - /* - * If the last reference to the inode is being deleted, then there is - * no need to attach and write inode data, it is being deleted anyway. - * And if the inode is being deleted, no need to synchronize - * write-buffer even if the inode is synchronous. - */ - if (!last_reference) { - ilen += ui->data_len; - sync |= IS_SYNC(inode); - } - - aligned_dlen = ALIGN(dlen, 8); - aligned_ilen = ALIGN(ilen, 8); - - len = aligned_dlen + aligned_ilen + UBIFS_INO_NODE_SZ; - /* Make sure to also account for extended attributes */ - if (ubifs_authenticated(c)) - len += ALIGN(host_ui->data_len, 8) + ubifs_auth_node_sz(c); - else - len += host_ui->data_len; - - dent = kzalloc(len, GFP_NOFS); - if (!dent) - return -ENOMEM; - - /* Make reservation before allocating sequence numbers */ - err = make_reservation(c, BASEHD, len); - if (err) - goto out_free; - - if (!xent) { - dent->ch.node_type = UBIFS_DENT_NODE; - if (fname_name(nm) == NULL) - dent_key_init_hash(c, &dent_key, dir->i_ino, nm->hash); - else - dent_key_init(c, &dent_key, dir->i_ino, nm); - } else { - dent->ch.node_type = UBIFS_XENT_NODE; - xent_key_init(c, &dent_key, dir->i_ino, nm); - } - - key_write(c, &dent_key, dent->key); - dent->inum = deletion ? 0 : cpu_to_le64(inode->i_ino); - dent->type = get_dent_type(inode->i_mode); - dent->nlen = cpu_to_le16(fname_len(nm)); - memcpy(dent->name, fname_name(nm), fname_len(nm)); - dent->name[fname_len(nm)] = '\0'; - set_dent_cookie(c, dent); - - zero_dent_node_unused(dent); - ubifs_prep_grp_node(c, dent, dlen, 0); - err = ubifs_node_calc_hash(c, dent, hash_dent); - if (err) - goto out_release; - - ino = (void *)dent + aligned_dlen; - pack_inode(c, ino, inode, 0); - err = ubifs_node_calc_hash(c, ino, hash_ino); - if (err) - goto out_release; - - ino = (void *)ino + aligned_ilen; - pack_inode(c, ino, dir, 1); - err = ubifs_node_calc_hash(c, ino, hash_ino_host); - if (err) - goto out_release; - - if (last_reference && !in_orphan) { - err = ubifs_add_orphan(c, inode->i_ino); - if (err) { - release_head(c, BASEHD); - goto out_finish; - } - ui->del_cmtno = c->cmt_no; - orphan_added = 1; - } - - err = write_head(c, BASEHD, dent, len, &lnum, &dent_offs, sync); - if (err) - goto out_release; - if (!sync) { - struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf; - - ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino); - ubifs_wbuf_add_ino_nolock(wbuf, dir->i_ino); - } - release_head(c, BASEHD); - kfree(dent); - ubifs_add_auth_dirt(c, lnum); - - if (deletion) { - if (fname_name(nm) == NULL) - err = ubifs_tnc_remove_dh(c, &dent_key, nm->minor_hash); - else - err = ubifs_tnc_remove_nm(c, &dent_key, nm); - if (err) - goto out_ro; - err = ubifs_add_dirt(c, lnum, dlen); - } else - err = ubifs_tnc_add_nm(c, &dent_key, lnum, dent_offs, dlen, - hash_dent, nm); - if (err) - goto out_ro; - - /* - * Note, we do not remove the inode from TNC even if the last reference - * to it has just been deleted, because the inode may still be opened. - * Instead, the inode has been added to orphan lists and the orphan - * subsystem will take further care about it. - */ - ino_key_init(c, &ino_key, inode->i_ino); - ino_offs = dent_offs + aligned_dlen; - err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, ilen, hash_ino); - if (err) - goto out_ro; - - ino_key_init(c, &ino_key, dir->i_ino); - ino_offs += aligned_ilen; - err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, - UBIFS_INO_NODE_SZ + host_ui->data_len, hash_ino_host); - if (err) - goto out_ro; - - if (in_orphan && inode->i_nlink) - ubifs_delete_orphan(c, inode->i_ino); - - finish_reservation(c); - spin_lock(&ui->ui_lock); - ui->synced_i_size = ui->ui_size; - spin_unlock(&ui->ui_lock); - if (xent) { - spin_lock(&host_ui->ui_lock); - host_ui->synced_i_size = host_ui->ui_size; - spin_unlock(&host_ui->ui_lock); - } - mark_inode_clean(c, ui); - mark_inode_clean(c, host_ui); - return 0; - -out_finish: - finish_reservation(c); -out_free: - kfree(dent); - return err; - -out_release: - release_head(c, BASEHD); - kfree(dent); -out_ro: - ubifs_ro_mode(c, err); - if (orphan_added) - ubifs_delete_orphan(c, inode->i_ino); - finish_reservation(c); - return err; -} - -/** - * ubifs_jnl_write_data - write a data node to the journal. - * @c: UBIFS file-system description object - * @inode: inode the data node belongs to - * @key: node key - * @buf: buffer to write - * @len: data length (must not exceed %UBIFS_BLOCK_SIZE) - * - * This function writes a data node to the journal. Returns %0 if the data node - * was successfully written, and a negative error code in case of failure. - */ -int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode, - const union ubifs_key *key, const void *buf, int len) -{ - struct ubifs_data_node *data; - int err, lnum, offs, compr_type, out_len, compr_len, auth_len; - int dlen = COMPRESSED_DATA_NODE_BUF_SZ, allocated = 1; - int write_len; - struct ubifs_inode *ui = ubifs_inode(inode); - bool encrypted = IS_ENCRYPTED(inode); - u8 hash[UBIFS_HASH_ARR_SZ]; - - dbg_jnlk(key, "ino %lu, blk %u, len %d, key ", - (unsigned long)key_inum(c, key), key_block(c, key), len); - ubifs_assert(c, len <= UBIFS_BLOCK_SIZE); - - if (encrypted) - dlen += UBIFS_CIPHER_BLOCK_SIZE; - - auth_len = ubifs_auth_node_sz(c); - - data = kmalloc(dlen + auth_len, GFP_NOFS | __GFP_NOWARN); - if (!data) { - /* - * Fall-back to the write reserve buffer. Note, we might be - * currently on the memory reclaim path, when the kernel is - * trying to free some memory by writing out dirty pages. The - * write reserve buffer helps us to guarantee that we are - * always able to write the data. - */ - allocated = 0; - mutex_lock(&c->write_reserve_mutex); - data = c->write_reserve_buf; - } - - data->ch.node_type = UBIFS_DATA_NODE; - key_write(c, key, &data->key); - data->size = cpu_to_le32(len); - - if (!(ui->flags & UBIFS_COMPR_FL)) - /* Compression is disabled for this inode */ - compr_type = UBIFS_COMPR_NONE; - else - compr_type = ui->compr_type; - - out_len = compr_len = dlen - UBIFS_DATA_NODE_SZ; - ubifs_compress(c, buf, len, &data->data, &compr_len, &compr_type); - ubifs_assert(c, compr_len <= UBIFS_BLOCK_SIZE); - - if (encrypted) { - err = ubifs_encrypt(inode, data, compr_len, &out_len, key_block(c, key)); - if (err) - goto out_free; - - } else { - data->compr_size = 0; - out_len = compr_len; - } - - dlen = UBIFS_DATA_NODE_SZ + out_len; - if (ubifs_authenticated(c)) - write_len = ALIGN(dlen, 8) + auth_len; - else - write_len = dlen; - - data->compr_type = cpu_to_le16(compr_type); - - /* Make reservation before allocating sequence numbers */ - err = make_reservation(c, DATAHD, write_len); - if (err) - goto out_free; - - ubifs_prepare_node(c, data, dlen, 0); - err = write_head(c, DATAHD, data, write_len, &lnum, &offs, 0); - if (err) - goto out_release; - - err = ubifs_node_calc_hash(c, data, hash); - if (err) - goto out_release; - - ubifs_wbuf_add_ino_nolock(&c->jheads[DATAHD].wbuf, key_inum(c, key)); - release_head(c, DATAHD); - - ubifs_add_auth_dirt(c, lnum); - - err = ubifs_tnc_add(c, key, lnum, offs, dlen, hash); - if (err) - goto out_ro; - - finish_reservation(c); - if (!allocated) - mutex_unlock(&c->write_reserve_mutex); - else - kfree(data); - return 0; - -out_release: - release_head(c, DATAHD); -out_ro: - ubifs_ro_mode(c, err); - finish_reservation(c); -out_free: - if (!allocated) - mutex_unlock(&c->write_reserve_mutex); - else - kfree(data); - return err; -} - -/** - * ubifs_jnl_write_inode - flush inode to the journal. - * @c: UBIFS file-system description object - * @inode: inode to flush - * - * This function writes inode @inode to the journal. If the inode is - * synchronous, it also synchronizes the write-buffer. Returns zero in case of - * success and a negative error code in case of failure. - */ -int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode) -{ - int err, lnum, offs; - struct ubifs_ino_node *ino, *ino_start; - struct ubifs_inode *ui = ubifs_inode(inode); - int sync = 0, write_len = 0, ilen = UBIFS_INO_NODE_SZ; - int last_reference = !inode->i_nlink; - int kill_xattrs = ui->xattr_cnt && last_reference; - u8 hash[UBIFS_HASH_ARR_SZ]; - - dbg_jnl("ino %lu, nlink %u", inode->i_ino, inode->i_nlink); - - /* - * If the inode is being deleted, do not write the attached data. No - * need to synchronize the write-buffer either. - */ - if (!last_reference) { - ilen += ui->data_len; - sync = IS_SYNC(inode); - } else if (kill_xattrs) { - write_len += UBIFS_INO_NODE_SZ * ui->xattr_cnt; - } - - if (ubifs_authenticated(c)) - write_len += ALIGN(ilen, 8) + ubifs_auth_node_sz(c); - else - write_len += ilen; - - ino_start = ino = kmalloc(write_len, GFP_NOFS); - if (!ino) - return -ENOMEM; - - /* Make reservation before allocating sequence numbers */ - err = make_reservation(c, BASEHD, write_len); - if (err) - goto out_free; - - if (kill_xattrs) { - union ubifs_key key; - struct fscrypt_name nm = {0}; - struct inode *xino; - struct ubifs_dent_node *xent, *pxent = NULL; - - if (ui->xattr_cnt > ubifs_xattr_max_cnt(c)) { - err = -EPERM; - ubifs_err(c, "Cannot delete inode, it has too much xattrs!"); - goto out_release; - } - - lowest_xent_key(c, &key, inode->i_ino); - while (1) { - xent = ubifs_tnc_next_ent(c, &key, &nm); - if (IS_ERR(xent)) { - err = PTR_ERR(xent); - if (err == -ENOENT) - break; - - kfree(pxent); - goto out_release; - } - - fname_name(&nm) = xent->name; - fname_len(&nm) = le16_to_cpu(xent->nlen); - - xino = ubifs_iget(c->vfs_sb, le64_to_cpu(xent->inum)); - if (IS_ERR(xino)) { - err = PTR_ERR(xino); - ubifs_err(c, "dead directory entry '%s', error %d", - xent->name, err); - ubifs_ro_mode(c, err); - kfree(pxent); - kfree(xent); - goto out_release; - } - ubifs_assert(c, ubifs_inode(xino)->xattr); - - clear_nlink(xino); - pack_inode(c, ino, xino, 0); - ino = (void *)ino + UBIFS_INO_NODE_SZ; - iput(xino); - - kfree(pxent); - pxent = xent; - key_read(c, &xent->key, &key); - } - kfree(pxent); - } - - pack_inode(c, ino, inode, 1); - err = ubifs_node_calc_hash(c, ino, hash); - if (err) - goto out_release; - - err = write_head(c, BASEHD, ino_start, write_len, &lnum, &offs, sync); - if (err) - goto out_release; - if (!sync) - ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, - inode->i_ino); - release_head(c, BASEHD); - - if (last_reference) { - err = ubifs_tnc_remove_ino(c, inode->i_ino); - if (err) - goto out_ro; - ubifs_delete_orphan(c, inode->i_ino); - err = ubifs_add_dirt(c, lnum, write_len); - } else { - union ubifs_key key; - - ubifs_add_auth_dirt(c, lnum); - - ino_key_init(c, &key, inode->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash); - } - if (err) - goto out_ro; - - finish_reservation(c); - spin_lock(&ui->ui_lock); - ui->synced_i_size = ui->ui_size; - spin_unlock(&ui->ui_lock); - kfree(ino_start); - return 0; - -out_release: - release_head(c, BASEHD); -out_ro: - ubifs_ro_mode(c, err); - finish_reservation(c); -out_free: - kfree(ino_start); - return err; -} - -/** - * ubifs_jnl_delete_inode - delete an inode. - * @c: UBIFS file-system description object - * @inode: inode to delete - * - * This function deletes inode @inode which includes removing it from orphans, - * deleting it from TNC and, in some cases, writing a deletion inode to the - * journal. - * - * When regular file inodes are unlinked or a directory inode is removed, the - * 'ubifs_jnl_update()' function writes a corresponding deletion inode and - * direntry to the media, and adds the inode to orphans. After this, when the - * last reference to this inode has been dropped, this function is called. In - * general, it has to write one more deletion inode to the media, because if - * a commit happened between 'ubifs_jnl_update()' and - * 'ubifs_jnl_delete_inode()', the deletion inode is not in the journal - * anymore, and in fact it might not be on the flash anymore, because it might - * have been garbage-collected already. And for optimization reasons UBIFS does - * not read the orphan area if it has been unmounted cleanly, so it would have - * no indication in the journal that there is a deleted inode which has to be - * removed from TNC. - * - * However, if there was no commit between 'ubifs_jnl_update()' and - * 'ubifs_jnl_delete_inode()', then there is no need to write the deletion - * inode to the media for the second time. And this is quite a typical case. - * - * This function returns zero in case of success and a negative error code in - * case of failure. - */ -int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode) -{ - int err; - struct ubifs_inode *ui = ubifs_inode(inode); - - ubifs_assert(c, inode->i_nlink == 0); - - if (ui->xattr_cnt || ui->del_cmtno != c->cmt_no) - /* A commit happened for sure or inode hosts xattrs */ - return ubifs_jnl_write_inode(c, inode); - - down_read(&c->commit_sem); - /* - * Check commit number again, because the first test has been done - * without @c->commit_sem, so a commit might have happened. - */ - if (ui->del_cmtno != c->cmt_no) { - up_read(&c->commit_sem); - return ubifs_jnl_write_inode(c, inode); - } - - err = ubifs_tnc_remove_ino(c, inode->i_ino); - if (err) - ubifs_ro_mode(c, err); - else - ubifs_delete_orphan(c, inode->i_ino); - up_read(&c->commit_sem); - return err; -} - -/** - * ubifs_jnl_xrename - cross rename two directory entries. - * @c: UBIFS file-system description object - * @fst_dir: parent inode of 1st directory entry to exchange - * @fst_inode: 1st inode to exchange - * @fst_nm: name of 1st inode to exchange - * @snd_dir: parent inode of 2nd directory entry to exchange - * @snd_inode: 2nd inode to exchange - * @snd_nm: name of 2nd inode to exchange - * @sync: non-zero if the write-buffer has to be synchronized - * - * This function implements the cross rename operation which may involve - * writing 2 inodes and 2 directory entries. It marks the written inodes as clean - * and returns zero on success. In case of failure, a negative error code is - * returned. - */ -int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir, - const struct inode *fst_inode, - const struct fscrypt_name *fst_nm, - const struct inode *snd_dir, - const struct inode *snd_inode, - const struct fscrypt_name *snd_nm, int sync) -{ - union ubifs_key key; - struct ubifs_dent_node *dent1, *dent2; - int err, dlen1, dlen2, lnum, offs, len, plen = UBIFS_INO_NODE_SZ; - int aligned_dlen1, aligned_dlen2; - int twoparents = (fst_dir != snd_dir); - void *p; - u8 hash_dent1[UBIFS_HASH_ARR_SZ]; - u8 hash_dent2[UBIFS_HASH_ARR_SZ]; - u8 hash_p1[UBIFS_HASH_ARR_SZ]; - u8 hash_p2[UBIFS_HASH_ARR_SZ]; - - ubifs_assert(c, ubifs_inode(fst_dir)->data_len == 0); - ubifs_assert(c, ubifs_inode(snd_dir)->data_len == 0); - ubifs_assert(c, mutex_is_locked(&ubifs_inode(fst_dir)->ui_mutex)); - ubifs_assert(c, mutex_is_locked(&ubifs_inode(snd_dir)->ui_mutex)); - - dlen1 = UBIFS_DENT_NODE_SZ + fname_len(snd_nm) + 1; - dlen2 = UBIFS_DENT_NODE_SZ + fname_len(fst_nm) + 1; - aligned_dlen1 = ALIGN(dlen1, 8); - aligned_dlen2 = ALIGN(dlen2, 8); - - len = aligned_dlen1 + aligned_dlen2 + ALIGN(plen, 8); - if (twoparents) - len += plen; - - len += ubifs_auth_node_sz(c); - - dent1 = kzalloc(len, GFP_NOFS); - if (!dent1) - return -ENOMEM; - - /* Make reservation before allocating sequence numbers */ - err = make_reservation(c, BASEHD, len); - if (err) - goto out_free; - - /* Make new dent for 1st entry */ - dent1->ch.node_type = UBIFS_DENT_NODE; - dent_key_init_flash(c, &dent1->key, snd_dir->i_ino, snd_nm); - dent1->inum = cpu_to_le64(fst_inode->i_ino); - dent1->type = get_dent_type(fst_inode->i_mode); - dent1->nlen = cpu_to_le16(fname_len(snd_nm)); - memcpy(dent1->name, fname_name(snd_nm), fname_len(snd_nm)); - dent1->name[fname_len(snd_nm)] = '\0'; - set_dent_cookie(c, dent1); - zero_dent_node_unused(dent1); - ubifs_prep_grp_node(c, dent1, dlen1, 0); - err = ubifs_node_calc_hash(c, dent1, hash_dent1); - if (err) - goto out_release; - - /* Make new dent for 2nd entry */ - dent2 = (void *)dent1 + aligned_dlen1; - dent2->ch.node_type = UBIFS_DENT_NODE; - dent_key_init_flash(c, &dent2->key, fst_dir->i_ino, fst_nm); - dent2->inum = cpu_to_le64(snd_inode->i_ino); - dent2->type = get_dent_type(snd_inode->i_mode); - dent2->nlen = cpu_to_le16(fname_len(fst_nm)); - memcpy(dent2->name, fname_name(fst_nm), fname_len(fst_nm)); - dent2->name[fname_len(fst_nm)] = '\0'; - set_dent_cookie(c, dent2); - zero_dent_node_unused(dent2); - ubifs_prep_grp_node(c, dent2, dlen2, 0); - err = ubifs_node_calc_hash(c, dent2, hash_dent2); - if (err) - goto out_release; - - p = (void *)dent2 + aligned_dlen2; - if (!twoparents) { - pack_inode(c, p, fst_dir, 1); - err = ubifs_node_calc_hash(c, p, hash_p1); - if (err) - goto out_release; - } else { - pack_inode(c, p, fst_dir, 0); - err = ubifs_node_calc_hash(c, p, hash_p1); - if (err) - goto out_release; - p += ALIGN(plen, 8); - pack_inode(c, p, snd_dir, 1); - err = ubifs_node_calc_hash(c, p, hash_p2); - if (err) - goto out_release; - } - - err = write_head(c, BASEHD, dent1, len, &lnum, &offs, sync); - if (err) - goto out_release; - if (!sync) { - struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf; - - ubifs_wbuf_add_ino_nolock(wbuf, fst_dir->i_ino); - ubifs_wbuf_add_ino_nolock(wbuf, snd_dir->i_ino); - } - release_head(c, BASEHD); - - ubifs_add_auth_dirt(c, lnum); - - dent_key_init(c, &key, snd_dir->i_ino, snd_nm); - err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, snd_nm); - if (err) - goto out_ro; - - offs += aligned_dlen1; - dent_key_init(c, &key, fst_dir->i_ino, fst_nm); - err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, fst_nm); - if (err) - goto out_ro; - - offs += aligned_dlen2; - - ino_key_init(c, &key, fst_dir->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p1); - if (err) - goto out_ro; - - if (twoparents) { - offs += ALIGN(plen, 8); - ino_key_init(c, &key, snd_dir->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p2); - if (err) - goto out_ro; - } - - finish_reservation(c); - - mark_inode_clean(c, ubifs_inode(fst_dir)); - if (twoparents) - mark_inode_clean(c, ubifs_inode(snd_dir)); - kfree(dent1); - return 0; - -out_release: - release_head(c, BASEHD); -out_ro: - ubifs_ro_mode(c, err); - finish_reservation(c); -out_free: - kfree(dent1); - return err; -} - -/** - * ubifs_jnl_rename - rename a directory entry. - * @c: UBIFS file-system description object - * @old_dir: parent inode of directory entry to rename - * @old_inode: directory entry's inode to rename - * @old_nm: name of the old directory entry to rename - * @new_dir: parent inode of directory entry to rename - * @new_inode: new directory entry's inode (or directory entry's inode to - * replace) - * @new_nm: new name of the new directory entry - * @whiteout: whiteout inode - * @sync: non-zero if the write-buffer has to be synchronized - * @delete_orphan: indicates an orphan entry deletion for @whiteout - * - * This function implements the re-name operation which may involve writing up - * to 4 inodes(new inode, whiteout inode, old and new parent directory inodes) - * and 2 directory entries. It marks the written inodes as clean and returns - * zero on success. In case of failure, a negative error code is returned. - */ -int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir, - const struct inode *old_inode, - const struct fscrypt_name *old_nm, - const struct inode *new_dir, - const struct inode *new_inode, - const struct fscrypt_name *new_nm, - const struct inode *whiteout, int sync, int delete_orphan) -{ - void *p; - union ubifs_key key; - struct ubifs_dent_node *dent, *dent2; - int err, dlen1, dlen2, ilen, wlen, lnum, offs, len, orphan_added = 0; - int aligned_dlen1, aligned_dlen2, plen = UBIFS_INO_NODE_SZ; - int last_reference = !!(new_inode && new_inode->i_nlink == 0); - int move = (old_dir != new_dir); - struct ubifs_inode *new_ui, *whiteout_ui; - u8 hash_old_dir[UBIFS_HASH_ARR_SZ]; - u8 hash_new_dir[UBIFS_HASH_ARR_SZ]; - u8 hash_new_inode[UBIFS_HASH_ARR_SZ]; - u8 hash_whiteout_inode[UBIFS_HASH_ARR_SZ]; - u8 hash_dent1[UBIFS_HASH_ARR_SZ]; - u8 hash_dent2[UBIFS_HASH_ARR_SZ]; - - ubifs_assert(c, ubifs_inode(old_dir)->data_len == 0); - ubifs_assert(c, ubifs_inode(new_dir)->data_len == 0); - ubifs_assert(c, mutex_is_locked(&ubifs_inode(old_dir)->ui_mutex)); - ubifs_assert(c, mutex_is_locked(&ubifs_inode(new_dir)->ui_mutex)); - - dlen1 = UBIFS_DENT_NODE_SZ + fname_len(new_nm) + 1; - dlen2 = UBIFS_DENT_NODE_SZ + fname_len(old_nm) + 1; - if (new_inode) { - new_ui = ubifs_inode(new_inode); - ubifs_assert(c, mutex_is_locked(&new_ui->ui_mutex)); - ilen = UBIFS_INO_NODE_SZ; - if (!last_reference) - ilen += new_ui->data_len; - } else - ilen = 0; - - if (whiteout) { - whiteout_ui = ubifs_inode(whiteout); - ubifs_assert(c, mutex_is_locked(&whiteout_ui->ui_mutex)); - ubifs_assert(c, whiteout->i_nlink == 1); - ubifs_assert(c, !whiteout_ui->dirty); - wlen = UBIFS_INO_NODE_SZ; - wlen += whiteout_ui->data_len; - } else - wlen = 0; - - aligned_dlen1 = ALIGN(dlen1, 8); - aligned_dlen2 = ALIGN(dlen2, 8); - len = aligned_dlen1 + aligned_dlen2 + ALIGN(ilen, 8) + - ALIGN(wlen, 8) + ALIGN(plen, 8); - if (move) - len += plen; - - len += ubifs_auth_node_sz(c); - - dent = kzalloc(len, GFP_NOFS); - if (!dent) - return -ENOMEM; - - /* Make reservation before allocating sequence numbers */ - err = make_reservation(c, BASEHD, len); - if (err) - goto out_free; - - /* Make new dent */ - dent->ch.node_type = UBIFS_DENT_NODE; - dent_key_init_flash(c, &dent->key, new_dir->i_ino, new_nm); - dent->inum = cpu_to_le64(old_inode->i_ino); - dent->type = get_dent_type(old_inode->i_mode); - dent->nlen = cpu_to_le16(fname_len(new_nm)); - memcpy(dent->name, fname_name(new_nm), fname_len(new_nm)); - dent->name[fname_len(new_nm)] = '\0'; - set_dent_cookie(c, dent); - zero_dent_node_unused(dent); - ubifs_prep_grp_node(c, dent, dlen1, 0); - err = ubifs_node_calc_hash(c, dent, hash_dent1); - if (err) - goto out_release; - - dent2 = (void *)dent + aligned_dlen1; - dent2->ch.node_type = UBIFS_DENT_NODE; - dent_key_init_flash(c, &dent2->key, old_dir->i_ino, old_nm); - - if (whiteout) { - dent2->inum = cpu_to_le64(whiteout->i_ino); - dent2->type = get_dent_type(whiteout->i_mode); - } else { - /* Make deletion dent */ - dent2->inum = 0; - dent2->type = DT_UNKNOWN; - } - dent2->nlen = cpu_to_le16(fname_len(old_nm)); - memcpy(dent2->name, fname_name(old_nm), fname_len(old_nm)); - dent2->name[fname_len(old_nm)] = '\0'; - set_dent_cookie(c, dent2); - zero_dent_node_unused(dent2); - ubifs_prep_grp_node(c, dent2, dlen2, 0); - err = ubifs_node_calc_hash(c, dent2, hash_dent2); - if (err) - goto out_release; - - p = (void *)dent2 + aligned_dlen2; - if (new_inode) { - pack_inode(c, p, new_inode, 0); - err = ubifs_node_calc_hash(c, p, hash_new_inode); - if (err) - goto out_release; - - p += ALIGN(ilen, 8); - } - - if (whiteout) { - pack_inode(c, p, whiteout, 0); - err = ubifs_node_calc_hash(c, p, hash_whiteout_inode); - if (err) - goto out_release; - - p += ALIGN(wlen, 8); - } - - if (!move) { - pack_inode(c, p, old_dir, 1); - err = ubifs_node_calc_hash(c, p, hash_old_dir); - if (err) - goto out_release; - } else { - pack_inode(c, p, old_dir, 0); - err = ubifs_node_calc_hash(c, p, hash_old_dir); - if (err) - goto out_release; - - p += ALIGN(plen, 8); - pack_inode(c, p, new_dir, 1); - err = ubifs_node_calc_hash(c, p, hash_new_dir); - if (err) - goto out_release; - } - - if (last_reference) { - err = ubifs_add_orphan(c, new_inode->i_ino); - if (err) { - release_head(c, BASEHD); - goto out_finish; - } - new_ui->del_cmtno = c->cmt_no; - orphan_added = 1; - } - - err = write_head(c, BASEHD, dent, len, &lnum, &offs, sync); - if (err) - goto out_release; - if (!sync) { - struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf; - - ubifs_wbuf_add_ino_nolock(wbuf, new_dir->i_ino); - ubifs_wbuf_add_ino_nolock(wbuf, old_dir->i_ino); - if (new_inode) - ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, - new_inode->i_ino); - if (whiteout) - ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, - whiteout->i_ino); - } - release_head(c, BASEHD); - - ubifs_add_auth_dirt(c, lnum); - - dent_key_init(c, &key, new_dir->i_ino, new_nm); - err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, new_nm); - if (err) - goto out_ro; - - offs += aligned_dlen1; - if (whiteout) { - dent_key_init(c, &key, old_dir->i_ino, old_nm); - err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, old_nm); - if (err) - goto out_ro; - } else { - err = ubifs_add_dirt(c, lnum, dlen2); - if (err) - goto out_ro; - - dent_key_init(c, &key, old_dir->i_ino, old_nm); - err = ubifs_tnc_remove_nm(c, &key, old_nm); - if (err) - goto out_ro; - } - - offs += aligned_dlen2; - if (new_inode) { - ino_key_init(c, &key, new_inode->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash_new_inode); - if (err) - goto out_ro; - offs += ALIGN(ilen, 8); - } - - if (whiteout) { - ino_key_init(c, &key, whiteout->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, wlen, - hash_whiteout_inode); - if (err) - goto out_ro; - offs += ALIGN(wlen, 8); - } - - ino_key_init(c, &key, old_dir->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_old_dir); - if (err) - goto out_ro; - - if (move) { - offs += ALIGN(plen, 8); - ino_key_init(c, &key, new_dir->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_new_dir); - if (err) - goto out_ro; - } - - if (delete_orphan) - ubifs_delete_orphan(c, whiteout->i_ino); - - finish_reservation(c); - if (new_inode) { - mark_inode_clean(c, new_ui); - spin_lock(&new_ui->ui_lock); - new_ui->synced_i_size = new_ui->ui_size; - spin_unlock(&new_ui->ui_lock); - } - /* - * No need to mark whiteout inode clean. - * Whiteout doesn't have non-zero size, no need to update - * synced_i_size for whiteout_ui. - */ - mark_inode_clean(c, ubifs_inode(old_dir)); - if (move) - mark_inode_clean(c, ubifs_inode(new_dir)); - kfree(dent); - return 0; - -out_release: - release_head(c, BASEHD); -out_ro: - ubifs_ro_mode(c, err); - if (orphan_added) - ubifs_delete_orphan(c, new_inode->i_ino); -out_finish: - finish_reservation(c); -out_free: - kfree(dent); - return err; -} - -/** - * truncate_data_node - re-compress/encrypt a truncated data node. - * @c: UBIFS file-system description object - * @inode: inode which refers to the data node - * @block: data block number - * @dn: data node to re-compress - * @new_len: new length - * @dn_size: size of the data node @dn in memory - * - * This function is used when an inode is truncated and the last data node of - * the inode has to be re-compressed/encrypted and re-written. - */ -static int truncate_data_node(const struct ubifs_info *c, const struct inode *inode, - unsigned int block, struct ubifs_data_node *dn, - int *new_len, int dn_size) -{ - void *buf; - int err, dlen, compr_type, out_len, data_size; - - out_len = le32_to_cpu(dn->size); - buf = kmalloc_array(out_len, WORST_COMPR_FACTOR, GFP_NOFS); - if (!buf) - return -ENOMEM; - - dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ; - data_size = dn_size - UBIFS_DATA_NODE_SZ; - compr_type = le16_to_cpu(dn->compr_type); - - if (IS_ENCRYPTED(inode)) { - err = ubifs_decrypt(inode, dn, &dlen, block); - if (err) - goto out; - } - - if (compr_type == UBIFS_COMPR_NONE) { - out_len = *new_len; - } else { - err = ubifs_decompress(c, &dn->data, dlen, buf, &out_len, compr_type); - if (err) - goto out; - - ubifs_compress(c, buf, *new_len, &dn->data, &out_len, &compr_type); - } - - if (IS_ENCRYPTED(inode)) { - err = ubifs_encrypt(inode, dn, out_len, &data_size, block); - if (err) - goto out; - - out_len = data_size; - } else { - dn->compr_size = 0; - } - - ubifs_assert(c, out_len <= UBIFS_BLOCK_SIZE); - dn->compr_type = cpu_to_le16(compr_type); - dn->size = cpu_to_le32(*new_len); - *new_len = UBIFS_DATA_NODE_SZ + out_len; - err = 0; -out: - kfree(buf); - return err; -} - -/** - * ubifs_jnl_truncate - update the journal for a truncation. - * @c: UBIFS file-system description object - * @inode: inode to truncate - * @old_size: old size - * @new_size: new size - * - * When the size of a file decreases due to truncation, a truncation node is - * written, the journal tree is updated, and the last data block is re-written - * if it has been affected. The inode is also updated in order to synchronize - * the new inode size. - * - * This function marks the inode as clean and returns zero on success. In case - * of failure, a negative error code is returned. - */ -int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode, - loff_t old_size, loff_t new_size) -{ - union ubifs_key key, to_key; - struct ubifs_ino_node *ino; - struct ubifs_trun_node *trun; - struct ubifs_data_node *dn; - int err, dlen, len, lnum, offs, bit, sz, sync = IS_SYNC(inode); - int dn_size; - struct ubifs_inode *ui = ubifs_inode(inode); - ino_t inum = inode->i_ino; - unsigned int blk; - u8 hash_ino[UBIFS_HASH_ARR_SZ]; - u8 hash_dn[UBIFS_HASH_ARR_SZ]; - - dbg_jnl("ino %lu, size %lld -> %lld", - (unsigned long)inum, old_size, new_size); - ubifs_assert(c, !ui->data_len); - ubifs_assert(c, S_ISREG(inode->i_mode)); - ubifs_assert(c, mutex_is_locked(&ui->ui_mutex)); - - dn_size = COMPRESSED_DATA_NODE_BUF_SZ; - - if (IS_ENCRYPTED(inode)) - dn_size += UBIFS_CIPHER_BLOCK_SIZE; - - sz = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ + - dn_size + ubifs_auth_node_sz(c); - - ino = kmalloc(sz, GFP_NOFS); - if (!ino) - return -ENOMEM; - - trun = (void *)ino + UBIFS_INO_NODE_SZ; - trun->ch.node_type = UBIFS_TRUN_NODE; - trun->inum = cpu_to_le32(inum); - trun->old_size = cpu_to_le64(old_size); - trun->new_size = cpu_to_le64(new_size); - zero_trun_node_unused(trun); - - dlen = new_size & (UBIFS_BLOCK_SIZE - 1); - if (dlen) { - /* Get last data block so it can be truncated */ - dn = (void *)trun + UBIFS_TRUN_NODE_SZ; - blk = new_size >> UBIFS_BLOCK_SHIFT; - data_key_init(c, &key, inum, blk); - dbg_jnlk(&key, "last block key "); - err = ubifs_tnc_lookup(c, &key, dn); - if (err == -ENOENT) - dlen = 0; /* Not found (so it is a hole) */ - else if (err) - goto out_free; - else { - int dn_len = le32_to_cpu(dn->size); - - if (dn_len <= 0 || dn_len > UBIFS_BLOCK_SIZE) { - ubifs_err(c, "bad data node (block %u, inode %lu)", - blk, inode->i_ino); - ubifs_dump_node(c, dn, dn_size); - err = -EUCLEAN; - goto out_free; - } - - if (dn_len <= dlen) - dlen = 0; /* Nothing to do */ - else { - err = truncate_data_node(c, inode, blk, dn, - &dlen, dn_size); - if (err) - goto out_free; - } - } - } - - /* Must make reservation before allocating sequence numbers */ - len = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ; - - if (ubifs_authenticated(c)) - len += ALIGN(dlen, 8) + ubifs_auth_node_sz(c); - else - len += dlen; - - err = make_reservation(c, BASEHD, len); - if (err) - goto out_free; - - pack_inode(c, ino, inode, 0); - err = ubifs_node_calc_hash(c, ino, hash_ino); - if (err) - goto out_release; - - ubifs_prep_grp_node(c, trun, UBIFS_TRUN_NODE_SZ, dlen ? 0 : 1); - if (dlen) { - ubifs_prep_grp_node(c, dn, dlen, 1); - err = ubifs_node_calc_hash(c, dn, hash_dn); - if (err) - goto out_release; - } - - err = write_head(c, BASEHD, ino, len, &lnum, &offs, sync); - if (err) - goto out_release; - if (!sync) - ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, inum); - release_head(c, BASEHD); - - ubifs_add_auth_dirt(c, lnum); - - if (dlen) { - sz = offs + UBIFS_INO_NODE_SZ + UBIFS_TRUN_NODE_SZ; - err = ubifs_tnc_add(c, &key, lnum, sz, dlen, hash_dn); - if (err) - goto out_ro; - } - - ino_key_init(c, &key, inum); - err = ubifs_tnc_add(c, &key, lnum, offs, UBIFS_INO_NODE_SZ, hash_ino); - if (err) - goto out_ro; - - err = ubifs_add_dirt(c, lnum, UBIFS_TRUN_NODE_SZ); - if (err) - goto out_ro; - - bit = new_size & (UBIFS_BLOCK_SIZE - 1); - blk = (new_size >> UBIFS_BLOCK_SHIFT) + (bit ? 1 : 0); - data_key_init(c, &key, inum, blk); - - bit = old_size & (UBIFS_BLOCK_SIZE - 1); - blk = (old_size >> UBIFS_BLOCK_SHIFT) - (bit ? 0 : 1); - data_key_init(c, &to_key, inum, blk); - - err = ubifs_tnc_remove_range(c, &key, &to_key); - if (err) - goto out_ro; - - finish_reservation(c); - spin_lock(&ui->ui_lock); - ui->synced_i_size = ui->ui_size; - spin_unlock(&ui->ui_lock); - mark_inode_clean(c, ui); - kfree(ino); - return 0; - -out_release: - release_head(c, BASEHD); -out_ro: - ubifs_ro_mode(c, err); - finish_reservation(c); -out_free: - kfree(ino); - return err; -} - - -/** - * ubifs_jnl_delete_xattr - delete an extended attribute. - * @c: UBIFS file-system description object - * @host: host inode - * @inode: extended attribute inode - * @nm: extended attribute entry name - * - * This function delete an extended attribute which is very similar to - * un-linking regular files - it writes a deletion xentry, a deletion inode and - * updates the target inode. Returns zero in case of success and a negative - * error code in case of failure. - */ -int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host, - const struct inode *inode, - const struct fscrypt_name *nm) -{ - int err, xlen, hlen, len, lnum, xent_offs, aligned_xlen, write_len; - struct ubifs_dent_node *xent; - struct ubifs_ino_node *ino; - union ubifs_key xent_key, key1, key2; - int sync = IS_DIRSYNC(host); - struct ubifs_inode *host_ui = ubifs_inode(host); - u8 hash[UBIFS_HASH_ARR_SZ]; - - ubifs_assert(c, inode->i_nlink == 0); - ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex)); - - /* - * Since we are deleting the inode, we do not bother to attach any data - * to it and assume its length is %UBIFS_INO_NODE_SZ. - */ - xlen = UBIFS_DENT_NODE_SZ + fname_len(nm) + 1; - aligned_xlen = ALIGN(xlen, 8); - hlen = host_ui->data_len + UBIFS_INO_NODE_SZ; - len = aligned_xlen + UBIFS_INO_NODE_SZ + ALIGN(hlen, 8); - - write_len = len + ubifs_auth_node_sz(c); - - xent = kzalloc(write_len, GFP_NOFS); - if (!xent) - return -ENOMEM; - - /* Make reservation before allocating sequence numbers */ - err = make_reservation(c, BASEHD, write_len); - if (err) { - kfree(xent); - return err; - } - - xent->ch.node_type = UBIFS_XENT_NODE; - xent_key_init(c, &xent_key, host->i_ino, nm); - key_write(c, &xent_key, xent->key); - xent->inum = 0; - xent->type = get_dent_type(inode->i_mode); - xent->nlen = cpu_to_le16(fname_len(nm)); - memcpy(xent->name, fname_name(nm), fname_len(nm)); - xent->name[fname_len(nm)] = '\0'; - zero_dent_node_unused(xent); - ubifs_prep_grp_node(c, xent, xlen, 0); - - ino = (void *)xent + aligned_xlen; - pack_inode(c, ino, inode, 0); - ino = (void *)ino + UBIFS_INO_NODE_SZ; - pack_inode(c, ino, host, 1); - err = ubifs_node_calc_hash(c, ino, hash); - if (err) - goto out_release; - - err = write_head(c, BASEHD, xent, write_len, &lnum, &xent_offs, sync); - if (!sync && !err) - ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, host->i_ino); - release_head(c, BASEHD); - - ubifs_add_auth_dirt(c, lnum); - kfree(xent); - if (err) - goto out_ro; - - /* Remove the extended attribute entry from TNC */ - err = ubifs_tnc_remove_nm(c, &xent_key, nm); - if (err) - goto out_ro; - err = ubifs_add_dirt(c, lnum, xlen); - if (err) - goto out_ro; - - /* - * Remove all nodes belonging to the extended attribute inode from TNC. - * Well, there actually must be only one node - the inode itself. - */ - lowest_ino_key(c, &key1, inode->i_ino); - highest_ino_key(c, &key2, inode->i_ino); - err = ubifs_tnc_remove_range(c, &key1, &key2); - if (err) - goto out_ro; - err = ubifs_add_dirt(c, lnum, UBIFS_INO_NODE_SZ); - if (err) - goto out_ro; - - /* And update TNC with the new host inode position */ - ino_key_init(c, &key1, host->i_ino); - err = ubifs_tnc_add(c, &key1, lnum, xent_offs + len - hlen, hlen, hash); - if (err) - goto out_ro; - - finish_reservation(c); - spin_lock(&host_ui->ui_lock); - host_ui->synced_i_size = host_ui->ui_size; - spin_unlock(&host_ui->ui_lock); - mark_inode_clean(c, host_ui); - return 0; - -out_release: - kfree(xent); - release_head(c, BASEHD); -out_ro: - ubifs_ro_mode(c, err); - finish_reservation(c); - return err; -} - -/** - * ubifs_jnl_change_xattr - change an extended attribute. - * @c: UBIFS file-system description object - * @inode: extended attribute inode - * @host: host inode - * - * This function writes the updated version of an extended attribute inode and - * the host inode to the journal (to the base head). The host inode is written - * after the extended attribute inode in order to guarantee that the extended - * attribute will be flushed when the inode is synchronized by 'fsync()' and - * consequently, the write-buffer is synchronized. This function returns zero - * in case of success and a negative error code in case of failure. - */ -int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode, - const struct inode *host) -{ - int err, len1, len2, aligned_len, aligned_len1, lnum, offs; - struct ubifs_inode *host_ui = ubifs_inode(host); - struct ubifs_ino_node *ino; - union ubifs_key key; - int sync = IS_DIRSYNC(host); - u8 hash_host[UBIFS_HASH_ARR_SZ]; - u8 hash[UBIFS_HASH_ARR_SZ]; - - dbg_jnl("ino %lu, ino %lu", host->i_ino, inode->i_ino); - ubifs_assert(c, inode->i_nlink > 0); - ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex)); - - len1 = UBIFS_INO_NODE_SZ + host_ui->data_len; - len2 = UBIFS_INO_NODE_SZ + ubifs_inode(inode)->data_len; - aligned_len1 = ALIGN(len1, 8); - aligned_len = aligned_len1 + ALIGN(len2, 8); - - aligned_len += ubifs_auth_node_sz(c); - - ino = kzalloc(aligned_len, GFP_NOFS); - if (!ino) - return -ENOMEM; - - /* Make reservation before allocating sequence numbers */ - err = make_reservation(c, BASEHD, aligned_len); - if (err) - goto out_free; - - pack_inode(c, ino, host, 0); - err = ubifs_node_calc_hash(c, ino, hash_host); - if (err) - goto out_release; - pack_inode(c, (void *)ino + aligned_len1, inode, 1); - err = ubifs_node_calc_hash(c, (void *)ino + aligned_len1, hash); - if (err) - goto out_release; - - err = write_head(c, BASEHD, ino, aligned_len, &lnum, &offs, 0); - if (!sync && !err) { - struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf; - - ubifs_wbuf_add_ino_nolock(wbuf, host->i_ino); - ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino); - } - release_head(c, BASEHD); - if (err) - goto out_ro; - - ubifs_add_auth_dirt(c, lnum); - - ino_key_init(c, &key, host->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs, len1, hash_host); - if (err) - goto out_ro; - - ino_key_init(c, &key, inode->i_ino); - err = ubifs_tnc_add(c, &key, lnum, offs + aligned_len1, len2, hash); - if (err) - goto out_ro; - - finish_reservation(c); - spin_lock(&host_ui->ui_lock); - host_ui->synced_i_size = host_ui->ui_size; - spin_unlock(&host_ui->ui_lock); - mark_inode_clean(c, host_ui); - kfree(ino); - return 0; - -out_release: - release_head(c, BASEHD); -out_ro: - ubifs_ro_mode(c, err); - finish_reservation(c); -out_free: - kfree(ino); - return err; -} - |