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-rw-r--r--fs/ubifs/sb.c274
1 files changed, 226 insertions, 48 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 2bf753b3888..4c37607a958 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -27,7 +27,9 @@
*/
#include "ubifs.h"
+#include <linux/slab.h>
#include <linux/random.h>
+#include <linux/math64.h>
/*
* Default journal size in logical eraseblocks as a percent of total
@@ -80,7 +82,8 @@ static int create_default_filesystem(struct ubifs_info *c)
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;
- uint64_t tmp64, main_bytes;
+ 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;
@@ -127,7 +130,6 @@ static int create_default_filesystem(struct ubifs_info *c)
* orphan node.
*/
orph_lebs = UBIFS_MIN_ORPH_LEBS;
-#ifdef CONFIG_UBIFS_FS_DEBUG
if (c->leb_cnt - min_leb_cnt > 1)
/*
* For debugging purposes it is better to have at least 2
@@ -135,7 +137,6 @@ static int create_default_filesystem(struct ubifs_info *c)
* consolidations and would be stressed more.
*/
orph_lebs += 1;
-#endif
main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - log_lebs;
main_lebs -= orph_lebs;
@@ -159,7 +160,7 @@ static int create_default_filesystem(struct ubifs_info *c)
if (!sup)
return -ENOMEM;
- tmp64 = (uint64_t)max_buds * c->leb_size;
+ tmp64 = (long long)max_buds * c->leb_size;
if (big_lpt)
sup_flags |= UBIFS_FLG_BIGLPT;
@@ -178,19 +179,22 @@ static int create_default_filesystem(struct ubifs_info *c)
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->default_compr = cpu_to_le16(UBIFS_COMPR_LZO);
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 = (uint64_t)main_lebs * c->leb_size;
- tmp64 = main_bytes * DEFAULT_RP_PERCENT;
- do_div(tmp64, 100);
+ 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, UBI_LONGTERM);
+ err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0);
kfree(sup);
if (err)
return err;
@@ -241,19 +245,18 @@ static int create_default_filesystem(struct ubifs_info *c)
mst->total_dirty = cpu_to_le64(tmp64);
/* The indexing LEB does not contribute to dark space */
- tmp64 = (c->main_lebs - 1) * c->dark_wm;
+ 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,
- UBI_UNKNOWN);
+ 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,
- UBI_UNKNOWN);
+ err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1,
+ 0);
kfree(mst);
if (err)
return err;
@@ -276,8 +279,7 @@ static int create_default_filesystem(struct ubifs_info *c)
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);
+ err = ubifs_write_node(c, idx, tmp, main_first + DEFAULT_IDX_LEB, 0);
kfree(idx);
if (err)
return err;
@@ -295,10 +297,10 @@ static int create_default_filesystem(struct ubifs_info *c)
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;
+ 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;
@@ -309,8 +311,7 @@ static int create_default_filesystem(struct ubifs_info *c)
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);
+ main_first + DEFAULT_DATA_LEB, 0);
kfree(ino);
if (err)
return err;
@@ -329,8 +330,7 @@ static int create_default_filesystem(struct ubifs_info *c)
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);
+ err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 0);
kfree(cs);
ubifs_msg("default file-system created");
@@ -391,9 +391,8 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
min_leb_cnt += c->lpt_lebs + c->orph_lebs + c->jhead_cnt + 6;
if (c->leb_cnt < 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,
- min_leb_cnt);
+ ubifs_err("bad LEB count: %d in superblock, %d on UBI volume, %d minimum required",
+ c->leb_cnt, c->vi.size, min_leb_cnt);
goto failed;
}
@@ -404,13 +403,22 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
}
if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
- err = 7;
+ ubifs_err("too few main LEBs count %d, must be at least %d",
+ c->main_lebs, UBIFS_MIN_MAIN_LEBS);
+ goto failed;
+ }
+
+ max_bytes = (long long)c->leb_size * UBIFS_MIN_BUD_LEBS;
+ if (c->max_bud_bytes < max_bytes) {
+ ubifs_err("too small journal (%lld bytes), must be at least %lld bytes",
+ c->max_bud_bytes, max_bytes);
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;
+ max_bytes = (long long)c->leb_size * c->main_lebs;
+ if (c->max_bud_bytes > max_bytes) {
+ ubifs_err("too large journal size (%lld bytes), only %lld bytes available in the main area",
+ c->max_bud_bytes, max_bytes);
goto failed;
}
@@ -444,7 +452,6 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
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;
@@ -460,7 +467,7 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
failed:
ubifs_err("bad superblock, error %d", err);
- dbg_dump_node(c, sup);
+ ubifs_dump_node(c, sup);
return -EINVAL;
}
@@ -469,7 +476,8 @@ failed:
* @c: UBIFS file-system description object
*
* This function returns a pointer to the superblock node or a negative error
- * code.
+ * code. Note, the user of this function is responsible of kfree()'ing the
+ * returned superblock buffer.
*/
struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
{
@@ -502,7 +510,7 @@ 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, UBI_LONGTERM);
+ return ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len);
}
/**
@@ -528,17 +536,35 @@ int ubifs_read_superblock(struct ubifs_info *c)
if (IS_ERR(sup))
return PTR_ERR(sup);
+ c->fmt_version = le32_to_cpu(sup->fmt_version);
+ c->ro_compat_version = le32_to_cpu(sup->ro_compat_version);
+
/*
* The software supports all previous versions but not future versions,
* due to the unavailability of time-travelling equipment.
*/
- c->fmt_version = le32_to_cpu(sup->fmt_version);
if (c->fmt_version > UBIFS_FORMAT_VERSION) {
- ubifs_err("on-flash format version is %d, but software only "
- "supports up to version %d", c->fmt_version,
- UBIFS_FORMAT_VERSION);
- err = -EINVAL;
- goto out;
+ ubifs_assert(!c->ro_media || c->ro_mount);
+ if (!c->ro_mount ||
+ c->ro_compat_version > UBIFS_RO_COMPAT_VERSION) {
+ ubifs_err("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);
+ if (c->ro_compat_version <= UBIFS_RO_COMPAT_VERSION) {
+ ubifs_msg("only R/O mounting is possible");
+ err = -EROFS;
+ } else
+ err = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * The FS is mounted R/O, and the media format is
+ * R/O-compatible with the UBIFS implementation, so we can
+ * mount.
+ */
+ c->rw_incompat = 1;
}
if (c->fmt_version < 3) {
@@ -581,23 +607,23 @@ int ubifs_read_superblock(struct ubifs_info *c)
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);
+ 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));
sup_flags = le32_to_cpu(sup->flags);
+ if (!c->mount_opts.override_compr)
+ c->default_compr = le16_to_cpu(sup->default_compr);
c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran);
-
memcpy(&c->uuid, &sup->uuid, 16);
-
c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT);
+ c->space_fixup = !!(sup_flags & UBIFS_FLG_SPACE_FIXUP);
/* 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)
+ if (c->ro_mount)
dbg_mnt("Auto resizing (ro) from %d LEBs to %d LEBs",
c->old_leb_cnt, c->leb_cnt);
else {
@@ -620,10 +646,162 @@ int ubifs_read_superblock(struct ubifs_info *c)
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;
}
+
+/**
+ * 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("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("free space fixup complete");
+ return err;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-09 02:51:05 +0000