diff options
| author | Jan Kara <jack@suse.cz> | 2010-10-20 22:17:28 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2011-01-06 17:03:55 +0100 |
| commit | c03cad241af63445b751781a09faf08b3a5b77c1 (patch) | |
| tree | 2e6f329259d442c23829c218a21977bbd6a5d248 /fs/udf/super.c | |
| parent | 949f4a7c08bc4a050eae7aeeac3e6d019d1feafb (diff) | |
udf: Protect default inode credentials by rwlock
Superblock carries credentials (uid, gid, etc.) which are used as default
values in __udf_read_inode() when media does not provide these. These
credentials can change during remount so we protect them by a rwlock so that
each inode gets a consistent set of credentials.
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf/super.c')
| -rw-r--r-- | fs/udf/super.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c index e54960c0e960..f06cc67cf864 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -568,12 +568,14 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options) return -EINVAL; lock_kernel(); + write_lock(&sbi->s_cred_lock); sbi->s_flags = uopt.flags; sbi->s_uid = uopt.uid; sbi->s_gid = uopt.gid; sbi->s_umask = uopt.umask; sbi->s_fmode = uopt.fmode; sbi->s_dmode = uopt.dmode; + write_unlock(&sbi->s_cred_lock); if (sbi->s_lvid_bh) { int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev); @@ -1960,6 +1962,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent) sbi->s_fmode = uopt.fmode; sbi->s_dmode = uopt.dmode; sbi->s_nls_map = uopt.nls_map; + rwlock_init(&sbi->s_cred_lock); if (uopt.session == 0xFFFFFFFF) sbi->s_session = udf_get_last_session(sb); |