This inserts compatibility check in nilfs_open function so that it
refuses to open the nilfs partition whose super block has incompatible
features that nilfs-utils doesn't know about.
It is verified only when NILFS_OPEN_RAW mode is specified. Moreover,
only incompat feature set is tested because the current nilfs_open
doesn't open the device in read/write mode.
Programs that want to write to the nilfs partition not via io-control
must confirm read-only compat feature set as well as the incompat
feature set.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
lib/nilfs.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/lib/nilfs.c b/lib/nilfs.c
index 982e874..44e368b 100644
--- a/lib/nilfs.c
+++ b/lib/nilfs.c
@@ -281,6 +281,7 @@ int nilfs_opt_test_mmap(struct nilfs *nilfs)
struct nilfs *nilfs_open(const char *dev, const char *dir, int flags)
{
struct nilfs *nilfs;
+ __u64 features;
int oflags;
if (!(flags & (NILFS_OPEN_RAW | NILFS_OPEN_RDONLY |
@@ -314,6 +315,13 @@ struct nilfs *nilfs_open(const char *dev, const char *dir, int flags)
goto out_fd;
if (nilfs_read_sb(nilfs) < 0)
goto out_fd;
+
+ features = le64_to_cpu(nilfs->n_sb->s_feature_incompat) &
+ ~NILFS_FEATURE_INCOMPAT_SUPP;
+ if (features) {
+ errno = ENOTSUP;
+ goto out_fd;
+ }
}
if (flags &
--
1.6.6.2
--
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