/* * This file is part of UBIFS. * * Copyright (C) 2006-2008 Nokia Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Authors: Artem Bityutskiy (Битюцкий Артём) * Adrian Hunter */ /* * This file implements UBIFS initialization and VFS superblock operations. Some * initialization stuff which is rather large and complex is placed at * corresponding subsystems, but most of it is here. */ #include "ubifs.h" #include <linux/math64.h> #define INODE_LOCKED_MAX 64 struct super_block *ubifs_sb; static struct inode *inodes_locked_down[INODE_LOCKED_MAX]; /* shrinker.c */ /* List of all UBIFS file-system instances */ struct list_head ubifs_infos; /* linux/fs/super.c */ static int sb_set(struct super_block *sb, void *data) { dev_t *dev = data; sb->s_dev = *dev; return 0; } /** * sget - find or create a superblock * @type: filesystem type superblock should belong to * @test: comparison callback * @set: setup callback * @data: argument to each of them */ struct super_block *sget(struct file_system_type *type, int (*test)(struct super_block *,void *), int (*set)(struct super_block *,void *), void *data) { struct super_block *s = NULL; int err; s = kzalloc(sizeof(struct super_block), GFP_USER); if (!s) { err = -ENOMEM; return ERR_PTR(err); } INIT_LIST_HEAD(&s->s_instances); INIT_LIST_HEAD(&s->s_inodes); s->s_time_gran = 1000000000; err = set(s, data); if (err) { return ERR_PTR(err); } s->s_type = type; strncpy(s->s_id, type->name, sizeof(s->s_id)); list_add(&s->s_instances, &type->fs_supers); return s; } /** * validate_inode - validate inode. * @c: UBIFS file-system description object * @inode: the inode to validate * * This is a helper function for 'ubifs_iget()' which validates various fields * of a newly built inode to make sure they contain sane values and prevent * possible vulnerabilities. Returns zero if the inode is all right and * a non-zero error code if not. */ static int validate_inode(struct ubifs_info *c, const struct inode *inode) { int err; const struct ubifs_inode *ui = ubifs_inode(inode); if (inode->i_size > c->max_inode_sz) { ubifs_err("inode is too large (%lld)", (long long)inode->i_size); return 1; } if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { ubifs_err("unknown compression type %d", ui->compr_type); return 2; } if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) return 4; if (!ubifs_compr_present(ui->compr_type)) { ubifs_warn("inode %lu uses '%s' compression, but it was not " "compiled in", inode->i_ino, ubifs_compr_name(ui->compr_type)); } err = dbg_check_dir_size(c, inode); return err; } struct inode *iget_locked(struct super_block *sb, unsigned long ino) { struct inode *inode; inode = (struct inode *)malloc(sizeof(struct ubifs_inode)); if (inode) { inode->i_ino = ino; inode->i_sb = sb; list_add(&inode->i_sb_list, &sb->s_inodes); inode->i_state = I_LOCK | I_NEW; } return inode; } int ubifs_iput(struct inode *inode) { list_del_init(&inode->i_sb_list); free(inode); return 0; } /* * Lock (save) inode in inode array for readback after recovery */ void iput(struct inode *inode) { int i; struct inode *ino; /* * Search end of list */ for (i = 0; i < INODE_LOCKED_MAX; i++) { if (inodes_locked_down[i] == NULL) break; } if (i >= INODE_LOCKED_MAX) { ubifs_err("Error, can't lock (save) more inodes while recovery!!!"); return; } /* * Allocate and use new inode */ ino = (struct inode *)malloc(sizeof(struct ubifs_inode)); memcpy(ino, inode, sizeof(struct ubifs_inode)); /* * Finally save inode in array */ inodes_locked_down[i] = ino; } struct inode *ubifs_iget(struct super_block *sb, unsigned long inum) { int err; union ubifs_key key; struct ubifs_ino_node *ino; struct ubifs_info *c = sb->s_fs_info; struct inode *inode; struct ubifs_inode *ui; int i; dbg_gen("inode %lu", inum); /* * U-Boot special handling of locked down inodes via recovery * e.g. ubifs_recover_size() */ for (i = 0; i < INODE_LOCKED_MAX; i++) { /* * Exit on last entry (NULL), inode not found in list */ if (inodes_locked_down[i] == NULL) break; if (inodes_locked_down[i]->i_ino == inum) { /* * We found the locked down inode in our array, * so just return this pointer instead of creating * a new one. */ return inodes_locked_down[i]; } } inode = iget_locked(sb, inum); if (!inode) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; ui = ubifs_inode(inode); ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS); if (!ino) { err = -ENOMEM; goto out; } ino_key_init(c, &key, inode->i_ino); err = ubifs_tnc_lookup(c, &key, ino); if (err) goto out_ino; inode->i_flags |= (S_NOCMTIME | S_NOATIME); inode->i_nlink = le32_to_cpu(ino->nlink); inode->i_uid = le32_to_cpu(ino->uid); inode->i_gid = le32_to_cpu(ino->gid); inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec); inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec); inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec); inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec); inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec); inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec); inode->i_mode = le32_to_cpu(ino->mode); inode->i_size = le64_to_cpu(ino->size); ui->data_len = le32_to_cpu(ino->data_len); ui->flags = le32_to_cpu(ino->flags); ui->compr_type = le16_to_cpu(ino->compr_type); ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); ui->synced_i_size = ui->ui_size = inode->i_size; err = validate_inode(c, inode); if (err) goto out_invalid; if ((inode->i_mode & S_IFMT) == S_IFLNK) { if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { err = 12; goto out_invalid; } ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); if (!ui->data) { err = -ENOMEM; goto out_ino; } memcpy(ui->data, ino->data, ui->data_len); ((char *)ui->data)[ui->data_len] = '\0'; } kfree(ino); inode->i_state &= ~(I_LOCK | I_NEW); return inode; out_invalid: ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err); dbg_dump_node(c, ino); dbg_dump_inode(c, inode); err = -EINVAL; out_ino: kfree(ino); out: ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err); return ERR_PTR(err); } /** * init_constants_early - initialize UBIFS constants. * @c: UBIFS file-system description object * * This function initialize UBIFS constants which do not need the superblock to * be read. It also checks that the UBI volume satisfies basic UBIFS * requirements. Returns zero in case of success and a negative error code in * case of failure. */ static int init_constants_early(struct ubifs_info *c) { if (c->vi.corrupted) { ubifs_warn("UBI volume is corrupted - read-only mode"); c->ro_media = 1; } if (c->di.ro_mode) { ubifs_msg("read-only UBI device"); c->ro_media = 1; } if (c->vi.vol_type == UBI_STATIC_VOLUME) { ubifs_msg("static UBI volume - read-only mode"); c->ro_media = 1; } c->leb_cnt = c->vi.size; c->leb_size = c->vi.usable_leb_size; c->half_leb_size = c->leb_size / 2; c->min_io_size = c->di.min_io_size; c->min_io_shift = fls(c->min_io_size) - 1; if (c->leb_size < UBIFS_MIN_LEB_SZ) { ubifs_err("too small LEBs (%d bytes), min. is %d bytes", c->leb_size, UBIFS_MIN_LEB_SZ); return -EINVAL; } if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { ubifs_err("too few LEBs (%d), min. is %d", c->leb_cnt, UBIFS_MIN_LEB_CNT); return -EINVAL; } if (!is_power_of_2(c->min_io_size)) { ubifs_err("bad min. I/O size %d", c->min_io_size); return -EINVAL; } /* * UBIFS aligns all node to 8-byte boundary, so to make function in * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is * less than 8. */ if (c->min_io_size < 8) { c->min_io_size = 8; c->min_io_shift = 3; } c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); /* * Initialize node length ranges which are mostly needed for node * length validation. */ c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; c->ranges[UBIFS_ORPH_NODE].min_len = UBIFS_ORPH_NODE_SZ + sizeof(__le64); c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; /* * Minimum indexing node size is amended later when superblock is * read and the key length is known. */ c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; /* * Maximum indexing node size is amended later when superblock is * read and the fanout is known. */ c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; /* * Initialize dead and dark LEB space watermarks. See gc.c for comments * about these values. */ c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); /* * Calculate how many bytes would be wasted at the end of LEB if it was * fully filled with data nodes of maximum size. This is used in * calculations when reporting free space. */ c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; return 0; } /* * init_constants_sb - initialize UBIFS constants. * @c: UBIFS file-system description object * * This is a helper function which initializes various UBIFS constants after * the superblock has been read. It also checks various UBIFS parameters and * makes sure they are all right. Returns zero in case of success and a * negative error code in case of failure. */ static int init_constants_sb(struct ubifs_info *c) { int tmp, err; long long tmp64; c->main_bytes = (long long)c->main_lebs * c->leb_size; c->max_znode_sz = sizeof(struct ubifs_znode) + c->fanout * sizeof(struct ubifs_zbranch); tmp = ubifs_idx_node_sz(c, 1); c->ranges[UBIFS_IDX_NODE].min_len = tmp; c->min_idx_node_sz = ALIGN(tmp, 8); tmp = ubifs_idx_node_sz(c, c->fanout); c->ranges[UBIFS_IDX_NODE].max_len = tmp; c->max_idx_node_sz = ALIGN(tmp, 8); /* Make sure LEB size is large enough to fit full commit */ tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; tmp = ALIGN(tmp, c->min_io_size); if (tmp > c->leb_size) { dbg_err("too small LEB size %d, at least %d needed", c->leb_size, tmp); return -EINVAL; } /* * Make sure that the log is large enough to fit reference nodes for * all buds plus one reserved LEB. */ tmp64 = c->max_bud_bytes + c->leb_size - 1; c->max_bud_cnt = div_u64(tmp64, c->leb_size); tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); tmp /= c->leb_size; tmp += 1; if (c->log_lebs < tmp) { dbg_err("too small log %d LEBs, required min. %d LEBs", c->log_lebs, tmp); return -EINVAL; } /* * When budgeting we assume worst-case scenarios when the pages are not * be compressed and direntries are of the maximum size. * * Note, data, which may be stored in inodes is budgeted separately, so * it is not included into 'c->inode_budget'. */ c->page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; c->inode_budget = UBIFS_INO_NODE_SZ; c->dent_budget = UBIFS_MAX_DENT_NODE_SZ; /* * When the amount of flash space used by buds becomes * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. * The writers are unblocked when the commit is finished. To avoid * writers to be blocked UBIFS initiates background commit in advance, * when number of bud bytes becomes above the limit defined below. */ c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; /* * Ensure minimum journal size. All the bytes in the journal heads are * considered to be used, when calculating the current journal usage. * Consequently, if the journal is too small, UBIFS will treat it as * always full. */ tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; if (c->bg_bud_bytes < tmp64) c->bg_bud_bytes = tmp64; if (c->max_bud_bytes < tmp64 + c->leb_size) c->max_bud_bytes = tmp64 + c->leb_size; err = ubifs_calc_lpt_geom(c); if (err) return err; return 0; } /* * init_constants_master - initialize UBIFS constants. * @c: UBIFS file-system description object * * This is a helper function which initializes various UBIFS constants after * the master node has been read. It also checks various UBIFS parameters and * makes sure they are all right. */ static void init_constants_master(struct ubifs_info *c) { long long tmp64; c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); /* * Calculate total amount of FS blocks. This number is not used * internally because it does not make much sense for UBIFS, but it is * necessary to report something for the 'statfs()' call. * * Subtract the LEB reserved for GC, the LEB which is reserved for * deletions, minimum LEBs for the index, and assume only one journal * head is available. */ tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; tmp64 *= (long long)c->leb_size - c->leb_overhead; tmp64 = ubifs_reported_space(c, tmp64); c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; } /** * free_orphans - free orphans. * @c: UBIFS file-system description object */ static void free_orphans(struct ubifs_info *c) { struct ubifs_orphan *orph; while (c->orph_dnext) { orph = c->orph_dnext; c->orph_dnext = orph->dnext; list_del(&orph->list); kfree(orph); } while (!list_empty(&c->orph_list)) { orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); list_del(&orph->list); kfree(orph); dbg_err("orphan list not empty at unmount"); } vfree(c->orph_buf); c->orph_buf = NULL; } /** * check_volume_empty - check if the UBI volume is empty. * @c: UBIFS file-system description object * * This function checks if the UBIFS volume is empty by looking if its LEBs are * mapped or not. The result of checking is stored in the @c->empty variable. * Returns zero in case of success and a negative error code in case of * failure. */ static int check_volume_empty(struct ubifs_info *c) { int lnum, err; c->empty = 1; for (lnum = 0; lnum < c->leb_cnt; lnum++) { err = ubi_is_mapped(c->ubi, lnum); if (unlikely(err < 0)) return err; if (err == 1) { c->empty = 0; break; } cond_resched(); } return 0; } /** * mount_ubifs - mount UBIFS file-system. * @c: UBIFS file-system description object * * This function mounts UBIFS file system. Returns zero in case of success and * a negative error code in case of failure. * * Note, the function does not de-allocate resources it it fails half way * through, and the caller has to do this instead. */ static int mount_ubifs(struct ubifs_info *c) { struct super_block *sb = c->vfs_sb; int err, mounted_read_only = (sb->s_flags & MS_RDONLY); long long x; size_t sz; err = init_constants_early(c); if (err) return err; err = ubifs_debugging_init(c); if (err) return err; err = check_volume_empty(c); if (err) goto out_free; if (c->empty && (mounted_read_only || c->ro_media)) { /* * This UBI volume is empty, and read-only, or the file system * is mounted read-only - we cannot format it. */ ubifs_err("can't format empty UBI volume: read-only %s", c->ro_media ? "UBI volume" : "mount"); err = -EROFS; goto out_free; } if (c->ro_media && !mounted_read_only) { ubifs_err("cannot mount read-write - read-only media"); err = -EROFS; goto out_free; } /* * The requirement for the buffer is that it should fit indexing B-tree * height amount of integers. We assume the height if the TNC tree will * never exceed 64. */ err = -ENOMEM; c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL); if (!c->bottom_up_buf) goto out_free; c->sbuf = vmalloc(c->leb_size); if (!c->sbuf) goto out_free; /* * We have to check all CRCs, even for data nodes, when we mount the FS * (specifically, when we are replaying). */ c->always_chk_crc = 1; err = ubifs_read_superblock(c); if (err) goto out_free; /* * Make sure the compressor which is set as default in the superblock * or overridden by mount options is actually compiled in. */ if (!ubifs_compr_present(c->default_compr)) { ubifs_err("'compressor \"%s\" is not compiled in", ubifs_compr_name(c->default_compr)); goto out_free; } dbg_failure_mode_registration(c); err = init_constants_sb(c); if (err) goto out_free; sz = ALIGN(c->max_idx_node_sz, c->min_io_size); sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); c->cbuf = kmalloc(sz, GFP_NOFS); if (!c->cbuf) { err = -ENOMEM; goto out_free; } sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); err = ubifs_read_master(c); if (err) goto out_master; init_constants_master(c); if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { ubifs_msg("recovery needed"); c->need_recovery = 1; } err = ubifs_lpt_init(c, 1, !mounted_read_only); if (err) goto out_lpt; err = dbg_check_idx_size(c, c->old_idx_sz); if (err) goto out_lpt; err = ubifs_replay_journal(c); if (err) goto out_journal; err = ubifs_mount_orphans(c, c->need_recovery, mounted_read_only); if (err) goto out_orphans; if (c->need_recovery) { err = ubifs_recover_size(c); if (err) goto out_orphans; } spin_lock(&ubifs_infos_lock); list_add_tail(&c->infos_list, &ubifs_infos); spin_unlock(&ubifs_infos_lock); if (c->need_recovery) { if (mounted_read_only) ubifs_msg("recovery deferred"); else { c->need_recovery = 0; ubifs_msg("recovery completed"); } } err = dbg_check_filesystem(c); if (err) goto out_infos; c->always_chk_crc = 0; ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", c->vi.ubi_num, c->vi.vol_id, c->vi.name); if (mounted_read_only) ubifs_msg("mounted read-only"); x = (long long)c->main_lebs * c->leb_size; ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d " "LEBs)", x, x >> 10, x >> 20, c->main_lebs); x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d " "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt); ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)", c->fmt_version, c->ro_compat_version, UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr)); ubifs_msg("reserved for root: %llu bytes (%llu KiB)", c->report_rp_size, c->report_rp_size >> 10); dbg_msg("compiled on: " __DATE__ " at " __TIME__); dbg_msg("min. I/O unit size: %d bytes", c->min_io_size); dbg_msg("LEB size: %d bytes (%d KiB)", c->leb_size, c->leb_size >> 10); dbg_msg("data journal heads: %d", c->jhead_cnt - NONDATA_JHEADS_CNT); dbg_msg("UUID: %02X%02X%02X%02X-%02X%02X" "-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", c->uuid[0], c->uuid[1], c->uuid[2], c->uuid[3], c->uuid[4], c->uuid[5], c->uuid[6], c->uuid[7], c->uuid[8], c->uuid[9], c->uuid[10], c->uuid[11], c->uuid[12], c->uuid[13], c->uuid[14], c->uuid[15]); dbg_msg("big_lpt %d", c->big_lpt); dbg_msg("log LEBs: %d (%d - %d)", c->log_lebs, UBIFS_LOG_LNUM, c->log_last); dbg_msg("LPT area LEBs: %d (%d - %d)", c->lpt_lebs, c->lpt_first, c->lpt_last); dbg_msg("orphan area LEBs: %d (%d - %d)", c->orph_lebs, c->orph_first, c->orph_last); dbg_msg("main area LEBs: %d (%d - %d)", c->main_lebs, c->main_first, c->leb_cnt - 1); dbg_msg("index LEBs: %d", c->lst.idx_lebs); dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)", c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20); dbg_msg("key hash type: %d", c->key_hash_type); dbg_msg("tree fanout: %d", c->fanout); dbg_msg("reserved GC LEB: %d", c->gc_lnum); dbg_msg("first main LEB: %d", c->main_first); dbg_msg("max. znode size %d", c->max_znode_sz); dbg_msg("max. index node size %d", c->max_idx_node_sz); dbg_msg("node sizes: data %zu, inode %zu, dentry %zu", UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); dbg_msg("node sizes: trun %zu, sb %zu, master %zu", UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu", UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu", UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, UBIFS_MAX_DENT_NODE_SZ); dbg_msg("dead watermark: %d", c->dead_wm); dbg_msg("dark watermark: %d", c->dark_wm); dbg_msg("LEB overhead: %d", c->leb_overhead); x = (long long)c->main_lebs * c->dark_wm; dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)", x, x >> 10, x >> 20); dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)", c->max_bud_bytes, c->max_bud_bytes >> 10, c->max_bud_bytes >> 20); dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", c->bg_bud_bytes, c->bg_bud_bytes >> 10, c->bg_bud_bytes >> 20); dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)", c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); dbg_msg("max. seq. number: %llu", c->max_sqnum); dbg_msg("commit number: %llu", c->cmt_no); return 0; out_infos: spin_lock(&ubifs_infos_lock); list_del(&c->infos_list); spin_unlock(&ubifs_infos_lock); out_orphans: free_orphans(c); out_journal: out_lpt: ubifs_lpt_free(c, 0); out_master: kfree(c->mst_node); kfree(c->rcvrd_mst_node); if (c->bgt) kthread_stop(c->bgt); kfree(c->cbuf); out_free: vfree(c->ileb_buf); vfree(c->sbuf); kfree(c->bottom_up_buf); ubifs_debugging_exit(c); return err; } /** * ubifs_umount - un-mount UBIFS file-system. * @c: UBIFS file-system description object * * Note, this function is called to free allocated resourced when un-mounting, * as well as free resources when an error occurred while we were half way * through mounting (error path cleanup function). So it has to make sure the * resource was actually allocated before freeing it. */ static void ubifs_umount(struct ubifs_info *c) { dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, c->vi.vol_id); spin_lock(&ubifs_infos_lock); list_del(&c->infos_list); spin_unlock(&ubifs_infos_lock); if (c->bgt) kthread_stop(c->bgt); free_orphans(c); ubifs_lpt_free(c, 0); kfree(c->cbuf); kfree(c->rcvrd_mst_node); kfree(c->mst_node); vfree(c->ileb_buf); vfree(c->sbuf); kfree(c->bottom_up_buf); ubifs_debugging_exit(c); /* Finally free U-Boot's global copy of superblock */ free(ubifs_sb->s_fs_info); free(ubifs_sb); } /** * open_ubi - parse UBI device name string and open the UBI device. * @name: UBI volume name * @mode: UBI volume open mode * * There are several ways to specify UBI volumes when mounting UBIFS: * o ubiX_Y - UBI device number X, volume Y; * o ubiY - UBI device number 0, volume Y; * o ubiX:NAME - mount UBI device X, volume with name NAME; * o ubi:NAME - mount UBI device 0, volume with name NAME. * * Alternative '!' separator may be used instead of ':' (because some shells * like busybox may interpret ':' as an NFS host name separator). This function * returns ubi volume object in case of success and a negative error code in * case of failure. */ static struct ubi_volume_desc *open_ubi(const char *name, int mode) { int dev, vol; char *endptr; if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') return ERR_PTR(-EINVAL); /* ubi:NAME method */ if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') return ubi_open_volume_nm(0, name + 4, mode); if (!isdigit(name[3])) return ERR_PTR(-EINVAL); dev = simple_strtoul(name + 3, &endptr, 0); /* ubiY method */ if (*endptr == '\0') return ubi_open_volume(0, dev, mode); /* ubiX_Y method */ if (*endptr == '_' && isdigit(endptr[1])) { vol = simple_strtoul(endptr + 1, &endptr, 0); if (*endptr != '\0') return ERR_PTR(-EINVAL); return ubi_open_volume(dev, vol, mode); } /* ubiX:NAME method */ if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') return ubi_open_volume_nm(dev, ++endptr, mode); return ERR_PTR(-EINVAL); } static int ubifs_fill_super(struct super_block *sb, void *data, int silent) { struct ubi_volume_desc *ubi = sb->s_fs_info; struct ubifs_info *c; struct inode *root; int err; c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); if (!c) return -ENOMEM; spin_lock_init(&c->cnt_lock); spin_lock_init(&c->cs_lock); spin_lock_init(&c->buds_lock); spin_lock_init(&c->space_lock); spin_lock_init(&c->orphan_lock); init_rwsem(&c->commit_sem); mutex_init(&c->lp_mutex); mutex_init(&c->tnc_mutex); mutex_init(&c->log_mutex); mutex_init(&c->mst_mutex); mutex_init(&c->umount_mutex); init_waitqueue_head(&c->cmt_wq); c->buds = RB_ROOT; c->old_idx = RB_ROOT; c->size_tree = RB_ROOT; c->orph_tree = RB_ROOT; INIT_LIST_HEAD(&c->infos_list); INIT_LIST_HEAD(&c->idx_gc); INIT_LIST_HEAD(&c->replay_list); INIT_LIST_HEAD(&c->replay_buds); INIT_LIST_HEAD(&c->uncat_list); INIT_LIST_HEAD(&c->empty_list); INIT_LIST_HEAD(&c->freeable_list); INIT_LIST_HEAD(&c->frdi_idx_list); INIT_LIST_HEAD(&c->unclean_leb_list); INIT_LIST_HEAD(&c->old_buds); INIT_LIST_HEAD(&c->orph_list); INIT_LIST_HEAD(&c->orph_new); c->highest_inum = UBIFS_FIRST_INO; c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; ubi_get_volume_info(ubi, &c->vi); ubi_get_device_info(c->vi.ubi_num, &c->di); /* Re-open the UBI device in read-write mode */ c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY); if (IS_ERR(c->ubi)) { err = PTR_ERR(c->ubi); goto out_free; } c->vfs_sb = sb; sb->s_fs_info = c; sb->s_magic = UBIFS_SUPER_MAGIC; sb->s_blocksize = UBIFS_BLOCK_SIZE; sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; sb->s_dev = c->vi.cdev; sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); if (c->max_inode_sz > MAX_LFS_FILESIZE) sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; if (c->rw_incompat) { ubifs_err("the file-system is not R/W-compatible"); ubifs_msg("on-flash format version is w%d/r%d, but software " "only supports up to version w%d/r%d", c->fmt_version, c->ro_compat_version, UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); return -EROFS; } mutex_lock(&c->umount_mutex); err = mount_ubifs(c); if (err) { ubifs_assert(err < 0); goto out_unlock; } /* Read the root inode */ root = ubifs_iget(sb, UBIFS_ROOT_INO); if (IS_ERR(root)) { err = PTR_ERR(root); goto out_umount; } sb->s_root = NULL; mutex_unlock(&c->umount_mutex); return 0; out_umount: ubifs_umount(c); out_unlock: mutex_unlock(&c->umount_mutex); ubi_close_volume(c->ubi); out_free: kfree(c); return err; } static int sb_test(struct super_block *sb, void *data) { dev_t *dev = data; return sb->s_dev == *dev; } static int ubifs_get_sb(struct file_system_type *fs_type, int flags, const char *name, void *data, struct vfsmount *mnt) { struct ubi_volume_desc *ubi; struct ubi_volume_info vi; struct super_block *sb; int err; dbg_gen("name %s, flags %#x", name, flags); /* * Get UBI device number and volume ID. Mount it read-only so far * because this might be a new mount point, and UBI allows only one * read-write user at a time. */ ubi = open_ubi(name, UBI_READONLY); if (IS_ERR(ubi)) { ubifs_err("cannot open \"%s\", error %d", name, (int)PTR_ERR(ubi)); return PTR_ERR(ubi); } ubi_get_volume_info(ubi, &vi); dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id); sb = sget(fs_type, &sb_test, &sb_set, &vi.cdev); if (IS_ERR(sb)) { err = PTR_ERR(sb); goto out_close; } if (sb->s_root) { /* A new mount point for already mounted UBIFS */ dbg_gen("this ubi volume is already mounted"); if ((flags ^ sb->s_flags) & MS_RDONLY) { err = -EBUSY; goto out_deact; } } else { sb->s_flags = flags; /* * Pass 'ubi' to 'fill_super()' in sb->s_fs_info where it is * replaced by 'c'. */ sb->s_fs_info = ubi; err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0); if (err) goto out_deact; /* We do not support atime */ sb->s_flags |= MS_ACTIVE | MS_NOATIME; } /* 'fill_super()' opens ubi again so we must close it here */ ubi_close_volume(ubi); ubifs_sb = sb; return 0; out_deact: up_write(&sb->s_umount); out_close: ubi_close_volume(ubi); return err; } int __init ubifs_init(void) { int err; BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); /* Make sure node sizes are 8-byte aligned */ BUILD_BUG_ON(UBIFS_CH_SZ & 7); BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); BUILD_BUG_ON(MIN_WRITE_SZ & 7); /* Check min. node size */ BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); /* Defined node sizes */ BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); /* * We use 2 bit wide bit-fields to store compression type, which should * be amended if more compressors are added. The bit-fields are: * @compr_type in 'struct ubifs_inode', @default_compr in * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. */ BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); /* * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. */ if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) { ubifs_err("VFS page cache size is %u bytes, but UBIFS requires" " at least 4096 bytes", (unsigned int)PAGE_CACHE_SIZE); return -EINVAL; } err = -ENOMEM; err = ubifs_compressors_init(); if (err) goto out_shrinker; return 0; out_shrinker: return err; } /* * ubifsmount... */ static struct file_system_type ubifs_fs_type = { .name = "ubifs", .owner = THIS_MODULE, .get_sb = ubifs_get_sb, }; int ubifs_mount(char *vol_name) { int flags; char name[80] = "ubi:"; void *data; struct vfsmount *mnt; int ret; struct ubifs_info *c; /* * First unmount if allready mounted */ if (ubifs_sb) ubifs_umount(ubifs_sb->s_fs_info); INIT_LIST_HEAD(&ubifs_infos); INIT_LIST_HEAD(&(ubifs_fs_type.fs_supers)); /* * Mount in read-only mode */ flags = MS_RDONLY; strcat(name, vol_name); data = NULL; mnt = NULL; ret = ubifs_get_sb(&ubifs_fs_type, flags, name, data, mnt); if (ret) { printf("Error reading superblock on volume '%s'!\n", name); return -1; } c = ubifs_sb->s_fs_info; ubi_close_volume(c->ubi); return 0; }