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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-06 15:00:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-06 15:00:19 -0700 |
| commit | e0724bf6e4a1f2e678d2b2aab01cae22e17862f0 (patch) | |
| tree | 559a8fa8e7a92f8ae0e0a27d4e71f408fa7cec62 /fs/ubifs/sb.c | |
| parent | 38d9aefb5ce8f26358b0d5cd933cfa9e267105b1 (diff) | |
| parent | de0975781a1a8bc92e07eb7681d10ef9bb5e6df9 (diff) | |
| download | linux-e0724bf6e4a1f2e678d2b2aab01cae22e17862f0.tar.gz | |
Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6
* 'linux-next' of git://git.infradead.org/ubifs-2.6:
UBIFS: fix recovery bug
UBIFS: add R/O compatibility
UBIFS: fix compiler warnings
UBIFS: fully sort GCed nodes
UBIFS: fix commentaries
UBIFS: introduce a helpful variable
UBIFS: use KERN_CONT
UBIFS: fix lprops committing bug
UBIFS: fix bogus assertion
UBIFS: fix bug where page is marked uptodate when out of space
UBIFS: amend key_hash return value
UBIFS: improve find function interface
UBIFS: list usage cleanup
UBIFS: fix dbg_chk_lpt_sz()
Diffstat (limited to 'fs/ubifs/sb.c')
| -rw-r--r-- | fs/ubifs/sb.c | 36 |
1 files changed, 29 insertions, 7 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c index e070c643d1bb..57085e43320f 100644 --- a/fs/ubifs/sb.c +++ b/fs/ubifs/sb.c @@ -193,6 +193,7 @@ static int create_default_filesystem(struct ubifs_info *c) 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); kfree(sup); @@ -532,17 +533,39 @@ 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; + struct super_block *sb = c->vfs_sb; + int mounting_ro = sb->s_flags & MS_RDONLY; + + ubifs_assert(!c->ro_media || mounting_ro); + if (!mounting_ro || + 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) { @@ -623,7 +646,6 @@ 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: |