diff options
Diffstat (limited to 'fs/ubifs/sb.c')
| -rw-r--r-- | fs/ubifs/sb.c | 612 |
1 files changed, 0 insertions, 612 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c deleted file mode 100644 index 2fe4c7cc6e87..000000000000 --- a/fs/ubifs/sb.c +++ /dev/null @@ -1,612 +0,0 @@ -/* - * 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 superblock. The superblock is stored at the first - * LEB of the volume and is never changed by UBIFS. Only user-space tools may - * change it. The superblock node mostly contains geometry information. - */ - -#include "ubifs.h" - -/* - * Default journal size in logical eraseblocks as a percent of total - * flash size. - */ -#define DEFAULT_JRN_PERCENT 5 - -/* Default maximum journal size in bytes */ -#define DEFAULT_MAX_JRN (32*1024*1024) - -/* Default indexing tree fanout */ -#define DEFAULT_FANOUT 8 - -/* Default number of LEBs for orphan information */ -#ifdef CONFIG_UBIFS_FS_DEBUG -#define DEFAULT_ORPHAN_LEBS 2 /* 2 is better for testing */ -#else -#define DEFAULT_ORPHAN_LEBS 1 -#endif - -/* Default number of journal heads */ -#define DEFAULT_JHEADS_CNT 1 - -/* Default positions of different LEBs in the main area */ -#define DEFAULT_IDX_LEB 0 -#define DEFAULT_DATA_LEB 1 -#define DEFAULT_GC_LEB 2 - -/* Default number of LEB numbers in LPT's save table */ -#define DEFAULT_LSAVE_CNT 256 - -/* Default reserved pool size as a percent of maximum free space */ -#define DEFAULT_RP_PERCENT 5 - -/* The default maximum size of reserved pool in bytes */ -#define DEFAULT_MAX_RP_SIZE (5*1024*1024) - -/* Default UBIFS compressor */ -#define DEFAULT_COMPRESSOR UBIFS_COMPR_LZO - -/* Default time granularity in nanoseconds */ -#define DEFAULT_TIME_GRAN 1000000000 - -/** - * create_default_filesystem - format empty UBI volume. - * @c: UBIFS file-system description object - * - * This function creates default empty file-system. Returns zero in case of - * success and a negative error code in case of failure. - */ -static int create_default_filesystem(struct ubifs_info *c) -{ - struct ubifs_sb_node *sup; - struct ubifs_mst_node *mst; - struct ubifs_idx_node *idx; - struct ubifs_branch *br; - struct ubifs_ino_node *ino; - struct ubifs_cs_node *cs; - union ubifs_key key; - int err, tmp, jrn_lebs, log_lebs, max_buds, main_lebs, main_first; - int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0; - uint64_t tmp64, main_bytes; - - /* Some functions called from here depend on the @c->key_len filed */ - c->key_len = UBIFS_SK_LEN; - - /* - * First of all, we have to calculate default file-system geometry - - * log size, journal size, etc. - */ - c->max_leb_cnt = c->leb_cnt; - if (c->leb_cnt < 0x7FFFFFFF / DEFAULT_JRN_PERCENT) - /* We can first multiply then divide and have no overflow */ - jrn_lebs = c->leb_cnt * DEFAULT_JRN_PERCENT / 100; - else - jrn_lebs = (c->leb_cnt / 100) * DEFAULT_JRN_PERCENT; - - if (jrn_lebs < UBIFS_MIN_JRN_LEBS) - jrn_lebs = UBIFS_MIN_JRN_LEBS; - if (jrn_lebs * c->leb_size > DEFAULT_MAX_JRN) - jrn_lebs = DEFAULT_MAX_JRN / c->leb_size; - - /* - * The log should be large enough to fit reference nodes for all bud - * LEBs. Because buds do not have to start from the beginning of LEBs - * (half of the LEB may contain committed data), the log should - * generally be larger, make it twice as large. - */ - tmp = 2 * (c->ref_node_alsz * jrn_lebs) + c->leb_size - 1; - log_lebs = tmp / c->leb_size; - /* Plus one LEB reserved for commit */ - log_lebs += 1; - /* And some extra space to allow writes while committing */ - log_lebs += 1; - - max_buds = jrn_lebs - log_lebs; - if (max_buds < UBIFS_MIN_BUD_LEBS) - max_buds = UBIFS_MIN_BUD_LEBS; - - /* - * Orphan nodes are stored in a separate area. One node can store a lot - * of orphan inode numbers, but when new orphan comes we just add a new - * orphan node. At some point the nodes are consolidated into one - * orphan node. - */ - orph_lebs = DEFAULT_ORPHAN_LEBS; - - main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - log_lebs; - main_lebs -= orph_lebs; - - lpt_first = UBIFS_LOG_LNUM + log_lebs; - c->lsave_cnt = DEFAULT_LSAVE_CNT; - err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs, - &big_lpt); - if (err) - return err; - - dbg_gen("LEB Properties Tree created (LEBs %d-%d)", lpt_first, - lpt_first + lpt_lebs - 1); - - main_first = c->leb_cnt - main_lebs; - - /* Create default superblock */ - tmp = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size); - sup = kzalloc(tmp, GFP_KERNEL); - if (!sup) - return -ENOMEM; - - tmp64 = (uint64_t)max_buds * c->leb_size; - if (big_lpt) - sup_flags |= UBIFS_FLG_BIGLPT; - - sup->ch.node_type = UBIFS_SB_NODE; - sup->key_hash = UBIFS_KEY_HASH_R5; - sup->flags = cpu_to_le32(sup_flags); - sup->min_io_size = cpu_to_le32(c->min_io_size); - sup->leb_size = cpu_to_le32(c->leb_size); - sup->leb_cnt = cpu_to_le32(c->leb_cnt); - sup->max_leb_cnt = cpu_to_le32(c->max_leb_cnt); - sup->max_bud_bytes = cpu_to_le64(tmp64); - sup->log_lebs = cpu_to_le32(log_lebs); - sup->lpt_lebs = cpu_to_le32(lpt_lebs); - sup->orph_lebs = cpu_to_le32(orph_lebs); - sup->jhead_cnt = cpu_to_le32(DEFAULT_JHEADS_CNT); - sup->fanout = cpu_to_le32(DEFAULT_FANOUT); - sup->lsave_cnt = cpu_to_le32(c->lsave_cnt); - sup->fmt_vers = cpu_to_le32(UBIFS_FORMAT_VERSION); - sup->default_compr = cpu_to_le16(DEFAULT_COMPRESSOR); - sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN); - - main_bytes = (uint64_t)main_lebs * c->leb_size; - tmp64 = main_bytes * DEFAULT_RP_PERCENT; - do_div(tmp64, 100); - if (tmp64 > DEFAULT_MAX_RP_SIZE) - tmp64 = DEFAULT_MAX_RP_SIZE; - sup->rp_size = cpu_to_le64(tmp64); - - err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0, UBI_LONGTERM); - kfree(sup); - if (err) - return err; - - dbg_gen("default superblock created at LEB 0:0"); - - /* Create default master node */ - mst = kzalloc(c->mst_node_alsz, GFP_KERNEL); - if (!mst) - return -ENOMEM; - - mst->ch.node_type = UBIFS_MST_NODE; - mst->log_lnum = cpu_to_le32(UBIFS_LOG_LNUM); - mst->highest_inum = cpu_to_le64(UBIFS_FIRST_INO); - mst->cmt_no = cpu_to_le64(0); - mst->root_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); - mst->root_offs = cpu_to_le32(0); - tmp = ubifs_idx_node_sz(c, 1); - mst->root_len = cpu_to_le32(tmp); - mst->gc_lnum = cpu_to_le32(main_first + DEFAULT_GC_LEB); - mst->ihead_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); - mst->ihead_offs = cpu_to_le32(ALIGN(tmp, c->min_io_size)); - mst->index_size = cpu_to_le64(ALIGN(tmp, 8)); - mst->lpt_lnum = cpu_to_le32(c->lpt_lnum); - mst->lpt_offs = cpu_to_le32(c->lpt_offs); - mst->nhead_lnum = cpu_to_le32(c->nhead_lnum); - mst->nhead_offs = cpu_to_le32(c->nhead_offs); - mst->ltab_lnum = cpu_to_le32(c->ltab_lnum); - mst->ltab_offs = cpu_to_le32(c->ltab_offs); - mst->lsave_lnum = cpu_to_le32(c->lsave_lnum); - mst->lsave_offs = cpu_to_le32(c->lsave_offs); - mst->lscan_lnum = cpu_to_le32(main_first); - mst->empty_lebs = cpu_to_le32(main_lebs - 2); - mst->idx_lebs = cpu_to_le32(1); - mst->leb_cnt = cpu_to_le32(c->leb_cnt); - - /* Calculate lprops statistics */ - tmp64 = main_bytes; - tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); - tmp64 -= ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size); - mst->total_free = cpu_to_le64(tmp64); - - tmp64 = ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); - ino_waste = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size) - - UBIFS_INO_NODE_SZ; - tmp64 += ino_waste; - tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), 8); - mst->total_dirty = cpu_to_le64(tmp64); - - /* The indexing LEB does not contribute to dark space */ - tmp64 = (c->main_lebs - 1) * c->dark_wm; - mst->total_dark = cpu_to_le64(tmp64); - - mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ); - - err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0, - UBI_UNKNOWN); - if (err) { - kfree(mst); - return err; - } - err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, 0, - UBI_UNKNOWN); - kfree(mst); - if (err) - return err; - - dbg_gen("default master node created at LEB %d:0", UBIFS_MST_LNUM); - - /* Create the root indexing node */ - tmp = ubifs_idx_node_sz(c, 1); - idx = kzalloc(ALIGN(tmp, c->min_io_size), GFP_KERNEL); - if (!idx) - return -ENOMEM; - - c->key_fmt = UBIFS_SIMPLE_KEY_FMT; - c->key_hash = key_r5_hash; - - idx->ch.node_type = UBIFS_IDX_NODE; - idx->child_cnt = cpu_to_le16(1); - ino_key_init(c, &key, UBIFS_ROOT_INO); - br = ubifs_idx_branch(c, idx, 0); - key_write_idx(c, &key, &br->key); - br->lnum = cpu_to_le32(main_first + DEFAULT_DATA_LEB); - br->len = cpu_to_le32(UBIFS_INO_NODE_SZ); - err = ubifs_write_node(c, idx, tmp, main_first + DEFAULT_IDX_LEB, 0, - UBI_UNKNOWN); - kfree(idx); - if (err) - return err; - - dbg_gen("default root indexing node created LEB %d:0", - main_first + DEFAULT_IDX_LEB); - - /* Create default root inode */ - tmp = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size); - ino = kzalloc(tmp, GFP_KERNEL); - if (!ino) - return -ENOMEM; - - ino_key_init_flash(c, &ino->key, UBIFS_ROOT_INO); - ino->ch.node_type = UBIFS_INO_NODE; - ino->creat_sqnum = cpu_to_le64(++c->max_sqnum); - ino->nlink = cpu_to_le32(2); - tmp = cpu_to_le64(CURRENT_TIME_SEC.tv_sec); - ino->atime_sec = tmp; - ino->ctime_sec = tmp; - ino->mtime_sec = tmp; - ino->atime_nsec = 0; - ino->ctime_nsec = 0; - ino->mtime_nsec = 0; - ino->mode = cpu_to_le32(S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO); - ino->size = cpu_to_le64(UBIFS_INO_NODE_SZ); - - /* Set compression enabled by default */ - ino->flags = cpu_to_le32(UBIFS_COMPR_FL); - - err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ, - main_first + DEFAULT_DATA_LEB, 0, - UBI_UNKNOWN); - kfree(ino); - if (err) - return err; - - dbg_gen("root inode created at LEB %d:0", - main_first + DEFAULT_DATA_LEB); - - /* - * The first node in the log has to be the commit start node. This is - * always the case during normal file-system operation. Write a fake - * commit start node to the log. - */ - tmp = ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size); - cs = kzalloc(tmp, GFP_KERNEL); - if (!cs) - return -ENOMEM; - - cs->ch.node_type = UBIFS_CS_NODE; - err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, - 0, UBI_UNKNOWN); - kfree(cs); - - ubifs_msg("default file-system created"); - return 0; -} - -/** - * validate_sb - validate superblock node. - * @c: UBIFS file-system description object - * @sup: superblock node - * - * This function validates superblock node @sup. Since most of data was read - * from the superblock and stored in @c, the function validates fields in @c - * instead. Returns zero in case of success and %-EINVAL in case of validation - * failure. - */ -static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup) -{ - long long max_bytes; - int err = 1; - - if (!c->key_hash) { - err = 2; - goto failed; - } - - if (sup->key_fmt != UBIFS_SIMPLE_KEY_FMT) { - err = 3; - goto failed; - } - - if (le32_to_cpu(sup->min_io_size) != c->min_io_size) { - ubifs_err("min. I/O unit mismatch: %d in superblock, %d real", - le32_to_cpu(sup->min_io_size), c->min_io_size); - goto failed; - } - - if (le32_to_cpu(sup->leb_size) != c->leb_size) { - ubifs_err("LEB size mismatch: %d in superblock, %d real", - le32_to_cpu(sup->leb_size), c->leb_size); - goto failed; - } - - if (c->leb_cnt < UBIFS_MIN_LEB_CNT || c->leb_cnt > c->vi.size) { - ubifs_err("bad LEB count: %d in superblock, %d on UBI volume, " - "%d minimum required", c->leb_cnt, c->vi.size, - UBIFS_MIN_LEB_CNT); - goto failed; - } - - if (c->max_leb_cnt < c->leb_cnt) { - ubifs_err("max. LEB count %d less than LEB count %d", - c->max_leb_cnt, c->leb_cnt); - goto failed; - } - - if (c->log_lebs < UBIFS_MIN_LOG_LEBS || - c->lpt_lebs < UBIFS_MIN_LPT_LEBS || - c->orph_lebs < UBIFS_MIN_ORPH_LEBS || - c->main_lebs < UBIFS_MIN_MAIN_LEBS) { - err = 6; - goto failed; - } - - if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) { - err = 7; - goto failed; - } - - if (c->max_bud_bytes < (long long)c->leb_size * UBIFS_MIN_BUD_LEBS || - c->max_bud_bytes > (long long)c->leb_size * c->main_lebs) { - err = 8; - goto failed; - } - - if (c->jhead_cnt < NONDATA_JHEADS_CNT + 1 || - c->jhead_cnt > NONDATA_JHEADS_CNT + UBIFS_MAX_JHEADS) { - err = 9; - goto failed; - } - - if (c->fanout < UBIFS_MIN_FANOUT || - ubifs_idx_node_sz(c, c->fanout) > c->leb_size) { - err = 10; - goto failed; - } - - if (c->lsave_cnt < 0 || (c->lsave_cnt > DEFAULT_LSAVE_CNT && - c->lsave_cnt > c->max_leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - - c->log_lebs - c->lpt_lebs - c->orph_lebs)) { - err = 11; - goto failed; - } - - if (UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs + c->lpt_lebs + - c->orph_lebs + c->main_lebs != c->leb_cnt) { - err = 12; - goto failed; - } - - if (c->default_compr < 0 || c->default_compr >= UBIFS_COMPR_TYPES_CNT) { - err = 13; - goto failed; - } - - max_bytes = c->main_lebs * (long long)c->leb_size; - if (c->rp_size < 0 || max_bytes < c->rp_size) { - err = 14; - goto failed; - } - - if (le32_to_cpu(sup->time_gran) > 1000000000 || - le32_to_cpu(sup->time_gran) < 1) { - err = 15; - goto failed; - } - - return 0; - -failed: - ubifs_err("bad superblock, error %d", err); - dbg_dump_node(c, sup); - return -EINVAL; -} - -/** - * ubifs_read_sb_node - read superblock node. - * @c: UBIFS file-system description object - * - * This function returns a pointer to the superblock node or a negative error - * code. - */ -struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c) -{ - struct ubifs_sb_node *sup; - int err; - - sup = kmalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_NOFS); - if (!sup) - return ERR_PTR(-ENOMEM); - - err = ubifs_read_node(c, sup, UBIFS_SB_NODE, UBIFS_SB_NODE_SZ, - UBIFS_SB_LNUM, 0); - if (err) { - kfree(sup); - return ERR_PTR(err); - } - - return sup; -} - -/** - * ubifs_write_sb_node - write superblock node. - * @c: UBIFS file-system description object - * @sup: superblock node read with 'ubifs_read_sb_node()' - * - * This function returns %0 on success and a negative error code on failure. - */ -int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup) -{ - int len = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size); - - ubifs_prepare_node(c, sup, UBIFS_SB_NODE_SZ, 1); - return ubi_leb_change(c->ubi, UBIFS_SB_LNUM, sup, len, UBI_LONGTERM); -} - -/** - * ubifs_read_superblock - read superblock. - * @c: UBIFS file-system description object - * - * This function finds, reads and checks the superblock. If an empty UBI volume - * is being mounted, this function creates default superblock. Returns zero in - * case of success, and a negative error code in case of failure. - */ -int ubifs_read_superblock(struct ubifs_info *c) -{ - int err, sup_flags; - struct ubifs_sb_node *sup; - - if (c->empty) { - err = create_default_filesystem(c); - if (err) - return err; - } - - sup = ubifs_read_sb_node(c); - if (IS_ERR(sup)) - return PTR_ERR(sup); - - /* - * The software supports all previous versions but not future versions, - * due to the unavailability of time-travelling equipment. - */ - c->fmt_vers = le32_to_cpu(sup->fmt_vers); - if (c->fmt_vers > UBIFS_FORMAT_VERSION) { - ubifs_err("on-flash format version is %d, but software only " - "supports up to version %d", c->fmt_vers, - UBIFS_FORMAT_VERSION); - err = -EINVAL; - goto out; - } - - if (c->fmt_vers == 1) { - ubifs_err("this on-flash format is not supported"); - err = -EINVAL; - goto out; - } - - switch (sup->key_hash) { - case UBIFS_KEY_HASH_R5: - c->key_hash = key_r5_hash; - c->key_hash_type = UBIFS_KEY_HASH_R5; - break; - - case UBIFS_KEY_HASH_TEST: - c->key_hash = key_test_hash; - c->key_hash_type = UBIFS_KEY_HASH_TEST; - break; - }; - - c->key_fmt = sup->key_fmt; - - switch (c->key_fmt) { - case UBIFS_SIMPLE_KEY_FMT: - c->key_len = UBIFS_SK_LEN; - break; - default: - ubifs_err("unsupported key format"); - err = -EINVAL; - goto out; - } - - c->leb_cnt = le32_to_cpu(sup->leb_cnt); - c->max_leb_cnt = le32_to_cpu(sup->max_leb_cnt); - c->max_bud_bytes = le64_to_cpu(sup->max_bud_bytes); - c->log_lebs = le32_to_cpu(sup->log_lebs); - c->lpt_lebs = le32_to_cpu(sup->lpt_lebs); - c->orph_lebs = le32_to_cpu(sup->orph_lebs); - c->jhead_cnt = le32_to_cpu(sup->jhead_cnt) + NONDATA_JHEADS_CNT; - c->fanout = le32_to_cpu(sup->fanout); - c->lsave_cnt = le32_to_cpu(sup->lsave_cnt); - c->default_compr = le16_to_cpu(sup->default_compr); - c->rp_size = le64_to_cpu(sup->rp_size); - c->rp_uid = le32_to_cpu(sup->rp_uid); - c->rp_gid = le32_to_cpu(sup->rp_gid); - sup_flags = le32_to_cpu(sup->flags); - - c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran); - - c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT); - - /* Automatically increase file system size to the maximum size */ - c->old_leb_cnt = c->leb_cnt; - if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) { - c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size); - if (c->vfs_sb->s_flags & MS_RDONLY) - dbg_mnt("Auto resizing (ro) from %d LEBs to %d LEBs", - c->old_leb_cnt, c->leb_cnt); - else { - dbg_mnt("Auto resizing (sb) from %d LEBs to %d LEBs", - c->old_leb_cnt, c->leb_cnt); - sup->leb_cnt = cpu_to_le32(c->leb_cnt); - err = ubifs_write_sb_node(c, sup); - if (err) - goto out; - c->old_leb_cnt = c->leb_cnt; - } - } - - c->log_bytes = (long long)c->log_lebs * c->leb_size; - c->log_last = UBIFS_LOG_LNUM + c->log_lebs - 1; - c->lpt_first = UBIFS_LOG_LNUM + c->log_lebs; - c->lpt_last = c->lpt_first + c->lpt_lebs - 1; - c->orph_first = c->lpt_last + 1; - c->orph_last = c->orph_first + c->orph_lebs - 1; - c->main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS; - c->main_lebs -= c->log_lebs + c->lpt_lebs + c->orph_lebs; - c->main_first = c->leb_cnt - c->main_lebs; - c->report_rp_size = ubifs_reported_space(c, c->rp_size); - - err = validate_sb(c, sup); -out: - kfree(sup); - return err; -} |