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| author | Joern Engel <joern@logfs.org> | 2010-03-05 16:07:04 +0100 |
|---|---|---|
| committer | Joern Engel <joern@logfs.org> | 2010-03-05 16:07:04 +0100 |
| commit | 6a08ab846cefc82a328cbf9abd96c2e58a6c3664 (patch) | |
| tree | 28aca16fc73f9b413d1ae9e67d97cdab39e869b6 /fs/logfs | |
| parent | c6d3830140f1d56b07d8ab56a6e14ca3c492a39a (diff) | |
| download | lwn-6a08ab846cefc82a328cbf9abd96c2e58a6c3664.tar.gz lwn-6a08ab846cefc82a328cbf9abd96c2e58a6c3664.zip | |
[LogFS] Check feature flags
Diffstat (limited to 'fs/logfs')
| -rw-r--r-- | fs/logfs/logfs_abi.h | 4 | ||||
| -rw-r--r-- | fs/logfs/super.c | 10 |
2 files changed, 12 insertions, 2 deletions
diff --git a/fs/logfs/logfs_abi.h b/fs/logfs/logfs_abi.h index 5d3782ddecc8..8d4dd3de551e 100644 --- a/fs/logfs/logfs_abi.h +++ b/fs/logfs/logfs_abi.h @@ -193,6 +193,10 @@ struct logfs_segment_header { SIZE_CHECK(logfs_segment_header, LOGFS_SEGMENT_HEADERSIZE); +#define LOGFS_FEATURES_INCOMPAT (0ull) +#define LOGFS_FEATURES_RO_COMPAT (0ull) +#define LOGFS_FEATURES_COMPAT (0ull) + /** * struct logfs_disk_super - on-medium superblock * diff --git a/fs/logfs/super.c b/fs/logfs/super.c index 1d081b7ede5a..c66beab78dee 100644 --- a/fs/logfs/super.c +++ b/fs/logfs/super.c @@ -440,7 +440,7 @@ static int __logfs_read_sb(struct super_block *sb) return 0; } -static int logfs_read_sb(struct super_block *sb) +static int logfs_read_sb(struct super_block *sb, int read_only) { struct logfs_super *super = logfs_super(sb); int ret; @@ -460,6 +460,12 @@ static int logfs_read_sb(struct super_block *sb) if (ret) return ret; + if (super->s_feature_incompat & ~LOGFS_FEATURES_INCOMPAT) + return -EIO; + if ((super->s_feature_ro_compat & ~LOGFS_FEATURES_RO_COMPAT) && + !read_only) + return -EIO; + mutex_init(&super->s_dirop_mutex); mutex_init(&super->s_object_alias_mutex); INIT_LIST_HEAD(&super->s_freeing_list); @@ -555,7 +561,7 @@ int logfs_get_sb_device(struct file_system_type *type, int flags, sb->s_op = &logfs_super_operations; sb->s_flags = flags | MS_NOATIME; - err = logfs_read_sb(sb); + err = logfs_read_sb(sb, sb->s_flags & MS_RDONLY); if (err) goto err1; |