diff options
| author | Jan Kara <jack@suse.cz> | 2018-09-06 15:56:10 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2018-09-07 10:32:22 +0200 |
| commit | a9ad01bc759df79b0012f43ee52164391e31cd96 (patch) | |
| tree | f1c661d0ea79df14520453b5439a19e117892065 /fs/udf/udf_sb.h | |
| parent | ext2: cache NULL when both default_acl and acl are NULL (diff) | |
| download | linux-a9ad01bc759df79b0012f43ee52164391e31cd96.tar.xz linux-a9ad01bc759df79b0012f43ee52164391e31cd96.zip | |
udf: Prevent write-unsupported filesystem to be remounted read-write
There are certain filesystem features which we support for reading but
not for writing. We properly refuse to mount such filesystems read-write
however for some features (such as read-only partitions), we don't check
for these features when remounting the filesystem from read-only to
read-write. Thus such filesystems could be remounted read-write leading
to strange behavior (most likely crashes).
Fix the problem by marking in superblock whether the filesystem has some
features that are supported in read-only mode and check this flag during
remount.
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf/udf_sb.h')
| -rw-r--r-- | fs/udf/udf_sb.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h index 9424d7cab790..d12e507e9eb2 100644 --- a/fs/udf/udf_sb.h +++ b/fs/udf/udf_sb.h @@ -30,6 +30,8 @@ #define UDF_FLAG_LASTBLOCK_SET 16 #define UDF_FLAG_BLOCKSIZE_SET 17 #define UDF_FLAG_INCONSISTENT 18 +#define UDF_FLAG_RW_INCOMPAT 19 /* Set when we find RW incompatible + * feature */ #define UDF_PART_FLAG_UNALLOC_BITMAP 0x0001 #define UDF_PART_FLAG_UNALLOC_TABLE 0x0002 |