diff options
Diffstat (limited to 'fs/ubifs/sb.c')
-rw-r--r-- | fs/ubifs/sb.c | 473 |
1 files changed, 0 insertions, 473 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c index 05655841e4..f7051c96d2 100644 --- a/fs/ubifs/sb.c +++ b/fs/ubifs/sb.c @@ -16,15 +16,9 @@ */ #include "ubifs.h" -#ifndef __BAREBOX__ -#include <linux/slab.h> -#include <linux/random.h> -#include <linux/math64.h> -#else #include <linux/err.h> #include <linux/stat.h> -#endif /* * Default journal size in logical eraseblocks as a percent of total @@ -58,283 +52,6 @@ /* Default time granularity in nanoseconds */ #define DEFAULT_TIME_GRAN 1000000000 -#ifndef __BAREBOX__ -/** - * 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, jnl_lebs, log_lebs, max_buds, main_lebs, main_first; - int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0; - int min_leb_cnt = UBIFS_MIN_LEB_CNT; - long long tmp64, main_bytes; - __le64 tmp_le64; - - /* 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. - */ - if (c->leb_cnt < 0x7FFFFFFF / DEFAULT_JNL_PERCENT) - /* We can first multiply then divide and have no overflow */ - jnl_lebs = c->leb_cnt * DEFAULT_JNL_PERCENT / 100; - else - jnl_lebs = (c->leb_cnt / 100) * DEFAULT_JNL_PERCENT; - - if (jnl_lebs < UBIFS_MIN_JNL_LEBS) - jnl_lebs = UBIFS_MIN_JNL_LEBS; - if (jnl_lebs * c->leb_size > DEFAULT_MAX_JNL) - jnl_lebs = DEFAULT_MAX_JNL / 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 * jnl_lebs) + c->leb_size - 1; - log_lebs = tmp / c->leb_size; - /* Plus one LEB reserved for commit */ - log_lebs += 1; - if (c->leb_cnt - min_leb_cnt > 8) { - /* And some extra space to allow writes while committing */ - log_lebs += 1; - min_leb_cnt += 1; - } - - max_buds = jnl_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 = UBIFS_MIN_ORPH_LEBS; - if (c->leb_cnt - min_leb_cnt > 1) - /* - * For debugging purposes it is better to have at least 2 - * orphan LEBs, because the orphan subsystem would need to do - * consolidations and would be stressed more. - */ - orph_lebs += 1; - - 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; - c->max_leb_cnt = c->leb_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 = (long long)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_version = cpu_to_le32(UBIFS_FORMAT_VERSION); - sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN); - if (c->mount_opts.override_compr) - sup->default_compr = cpu_to_le16(c->mount_opts.compr_type); - else - sup->default_compr = cpu_to_le16(UBIFS_COMPR_LZO); - - generate_random_uuid(sup->uuid); - - main_bytes = (long long)main_lebs * c->leb_size; - tmp64 = div_u64(main_bytes * DEFAULT_RP_PERCENT, 100); - if (tmp64 > DEFAULT_MAX_RP_SIZE) - tmp64 = DEFAULT_MAX_RP_SIZE; - sup->rp_size = cpu_to_le64(tmp64); - sup->ro_compat_version = cpu_to_le32(UBIFS_RO_COMPAT_VERSION); - - err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0); - 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 = 0; - mst->root_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); - mst->root_offs = 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 = ((long long)(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); - if (err) { - kfree(mst); - return err; - } - err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, - 0); - 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); - 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_le64 = cpu_to_le64(CURRENT_TIME_SEC.tv_sec); - ino->atime_sec = tmp_le64; - ino->ctime_sec = tmp_le64; - ino->mtime_sec = tmp_le64; - 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); - 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); - kfree(cs); - if (err) - return err; - - ubifs_msg(c, "default file-system created"); - return 0; -} -#endif /** * validate_sb - validate superblock node. @@ -498,21 +215,6 @@ struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c) } /** - * 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 ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len); -} - -/** * ubifs_read_superblock - read superblock. * @c: UBIFS file-system description object * @@ -526,14 +228,8 @@ int ubifs_read_superblock(struct ubifs_info *c) struct ubifs_sb_node *sup; if (c->empty) { -#ifndef __BAREBOX__ - err = create_default_filesystem(c); - if (err) - return err; -#else printf("No UBIFS filesystem found!\n"); return -1; -#endif } sup = ubifs_read_sb_node(c); @@ -612,13 +308,8 @@ int ubifs_read_superblock(struct ubifs_info *c) c->fanout = le32_to_cpu(sup->fanout); c->lsave_cnt = le32_to_cpu(sup->lsave_cnt); c->rp_size = le64_to_cpu(sup->rp_size); -#ifndef __BAREBOX__ - c->rp_uid = make_kuid(&init_user_ns, le32_to_cpu(sup->rp_uid)); - c->rp_gid = make_kgid(&init_user_ns, le32_to_cpu(sup->rp_gid)); -#else c->rp_uid = le32_to_cpu(sup->rp_uid); c->rp_gid = le32_to_cpu(sup->rp_gid); -#endif sup_flags = le32_to_cpu(sup->flags); if (!c->mount_opts.override_compr) c->default_compr = le16_to_cpu(sup->default_compr); @@ -635,17 +326,6 @@ int ubifs_read_superblock(struct ubifs_info *c) if (c->ro_mount) dbg_mnt("Auto resizing (ro) from %d LEBs to %d LEBs", c->old_leb_cnt, c->leb_cnt); -#ifndef __BAREBOX__ - 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; - } -#endif } c->log_bytes = (long long)c->log_lebs * c->leb_size; @@ -663,156 +343,3 @@ out: kfree(sup); return err; } - -/** - * fixup_leb - fixup/unmap an LEB containing free space. - * @c: UBIFS file-system description object - * @lnum: the LEB number to fix up - * @len: number of used bytes in LEB (starting at offset 0) - * - * This function reads the contents of the given LEB number @lnum, then fixes - * it up, so that empty min. I/O units in the end of LEB are actually erased on - * flash (rather than being just all-0xff real data). If the LEB is completely - * empty, it is simply unmapped. - */ -static int fixup_leb(struct ubifs_info *c, int lnum, int len) -{ - int err; - - ubifs_assert(len >= 0); - ubifs_assert(len % c->min_io_size == 0); - ubifs_assert(len < c->leb_size); - - if (len == 0) { - dbg_mnt("unmap empty LEB %d", lnum); - return ubifs_leb_unmap(c, lnum); - } - - dbg_mnt("fixup LEB %d, data len %d", lnum, len); - err = ubifs_leb_read(c, lnum, c->sbuf, 0, len, 1); - if (err) - return err; - - return ubifs_leb_change(c, lnum, c->sbuf, len); -} - -/** - * fixup_free_space - find & remap all LEBs containing free space. - * @c: UBIFS file-system description object - * - * This function walks through all LEBs in the filesystem and fiexes up those - * containing free/empty space. - */ -static int fixup_free_space(struct ubifs_info *c) -{ - int lnum, err = 0; - struct ubifs_lprops *lprops; - - ubifs_get_lprops(c); - - /* Fixup LEBs in the master area */ - for (lnum = UBIFS_MST_LNUM; lnum < UBIFS_LOG_LNUM; lnum++) { - err = fixup_leb(c, lnum, c->mst_offs + c->mst_node_alsz); - if (err) - goto out; - } - - /* Unmap unused log LEBs */ - lnum = ubifs_next_log_lnum(c, c->lhead_lnum); - while (lnum != c->ltail_lnum) { - err = fixup_leb(c, lnum, 0); - if (err) - goto out; - lnum = ubifs_next_log_lnum(c, lnum); - } - - /* - * Fixup the log head which contains the only a CS node at the - * beginning. - */ - err = fixup_leb(c, c->lhead_lnum, - ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size)); - if (err) - goto out; - - /* Fixup LEBs in the LPT area */ - for (lnum = c->lpt_first; lnum <= c->lpt_last; lnum++) { - int free = c->ltab[lnum - c->lpt_first].free; - - if (free > 0) { - err = fixup_leb(c, lnum, c->leb_size - free); - if (err) - goto out; - } - } - - /* Unmap LEBs in the orphans area */ - for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) { - err = fixup_leb(c, lnum, 0); - if (err) - goto out; - } - - /* Fixup LEBs in the main area */ - for (lnum = c->main_first; lnum < c->leb_cnt; lnum++) { - lprops = ubifs_lpt_lookup(c, lnum); - if (IS_ERR(lprops)) { - err = PTR_ERR(lprops); - goto out; - } - - if (lprops->free > 0) { - err = fixup_leb(c, lnum, c->leb_size - lprops->free); - if (err) - goto out; - } - } - -out: - ubifs_release_lprops(c); - return err; -} - -/** - * ubifs_fixup_free_space - find & fix all LEBs with free space. - * @c: UBIFS file-system description object - * - * This function fixes up LEBs containing free space on first mount, if the - * appropriate flag was set when the FS was created. Each LEB with one or more - * empty min. I/O unit (i.e. free-space-count > 0) is re-written, to make sure - * the free space is actually erased. E.g., this is necessary for some NAND - * chips, since the free space may have been programmed like real "0xff" data - * (generating a non-0xff ECC), causing future writes to the not-really-erased - * NAND pages to behave badly. After the space is fixed up, the superblock flag - * is cleared, so that this is skipped for all future mounts. - */ -int ubifs_fixup_free_space(struct ubifs_info *c) -{ - int err; - struct ubifs_sb_node *sup; - - ubifs_assert(c->space_fixup); - ubifs_assert(!c->ro_mount); - - ubifs_msg(c, "start fixing up free space"); - - err = fixup_free_space(c); - if (err) - return err; - - sup = ubifs_read_sb_node(c); - if (IS_ERR(sup)) - return PTR_ERR(sup); - - /* Free-space fixup is no longer required */ - c->space_fixup = 0; - sup->flags &= cpu_to_le32(~UBIFS_FLG_SPACE_FIXUP); - - err = ubifs_write_sb_node(c, sup); - kfree(sup); - if (err) - return err; - - ubifs_msg(c, "free space fixup complete"); - return err; -} |