diff options
| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2009-03-26 12:51:21 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2009-03-26 16:36:20 +0200 |
| commit | 963f0cf6d116d83c558a8efe9045c1c5ad7aed34 (patch) | |
| tree | 43937f0d742bfac7dfc1a00bae8f72e98dc87425 /fs/ubifs/ubifs.h | |
| parent | fcabb3479e2b15abfd2d2ef5363295f16e98b2d7 (diff) | |
UBIFS: add R/O compatibility
Now UBIFS is supported by u-boot. If we ever decide to change the
media format, then people will have to upgrade their u-boots to
mount new format images. However, very often it is possible to
preserve R/O forward-compatibility, even though the write
forward-compatibility is not preserved.
This patch introduces a new super-block field which stores the
R/O compatibility version.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Acked-by: Adrian Hunter <Adrian.Hunter@nokia.com>
Diffstat (limited to 'fs/ubifs/ubifs.h')
| -rw-r--r-- | fs/ubifs/ubifs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index a53b9a6df2b..0a8341e1408 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -934,6 +934,7 @@ struct ubifs_debug_info; * by @commit_sem * @cnt_lock: protects @highest_inum and @max_sqnum counters * @fmt_version: UBIFS on-flash format version + * @ro_compat_version: R/O compatibility version * @uuid: UUID from super block * * @lhead_lnum: log head logical eraseblock number @@ -966,6 +967,7 @@ struct ubifs_debug_info; * recovery) * @bulk_read: enable bulk-reads * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc) + * @rw_incompat: the media is not R/W compatible * * @tnc_mutex: protects the Tree Node Cache (TNC), @zroot, @cnext, @enext, and * @calc_idx_sz @@ -1179,6 +1181,7 @@ struct ubifs_info { unsigned long long cmt_no; spinlock_t cnt_lock; int fmt_version; + int ro_compat_version; unsigned char uuid[16]; int lhead_lnum; @@ -1207,6 +1210,7 @@ struct ubifs_info { unsigned int no_chk_data_crc:1; unsigned int bulk_read:1; unsigned int default_compr:2; + unsigned int rw_incompat:1; struct mutex tnc_mutex; struct ubifs_zbranch zroot; |