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| author | Martin Kaistra <martin.kaistra@linutronix.de> | 2020-07-07 13:31:59 +0300 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2020-08-02 23:23:46 +0300 |
| commit | a7a8f4a1e6b309b5365be784a07bbda1ceab2d9e (patch) | |
| tree | 6906568ee4d6f637030fb5cd8d3cc7d6eb6b64c6 /fs/ubifs/sb.c | |
| parent | 92ed301919932f777713b9172e525674157e983d (diff) | |
| download | linux-a7a8f4a1e6b309b5365be784a07bbda1ceab2d9e.tar.xz | |
ubifs: add option to specify version for new file systems
Instead of creating ubifs file systems with UBIFS_FORMAT_VERSION
by default, add a module parameter ubifs.default_version to allow
the user to specify the desired version. Valid values are 4 to
UBIFS_FORMAT_VERSION (currently 5).
This way, one can for example create a file system with version 4
on kernel 4.19 which can still be mounted rw when downgrading to
kernel 4.9.
Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/sb.c')
| -rw-r--r-- | fs/ubifs/sb.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c index 4b4b65b48c57..c0d3e4008d23 100644 --- a/fs/ubifs/sb.c +++ b/fs/ubifs/sb.c @@ -174,7 +174,8 @@ static int create_default_filesystem(struct ubifs_info *c) tmp64 = (long long)max_buds * c->leb_size; if (big_lpt) sup_flags |= UBIFS_FLG_BIGLPT; - sup_flags |= UBIFS_FLG_DOUBLE_HASH; + if (ubifs_default_version > 4) + sup_flags |= UBIFS_FLG_DOUBLE_HASH; if (ubifs_authenticated(c)) { sup_flags |= UBIFS_FLG_AUTHENTICATION; @@ -200,7 +201,7 @@ static int create_default_filesystem(struct ubifs_info *c) 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->fmt_version = cpu_to_le32(ubifs_default_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); |