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authorJan Kara <jack@suse.cz>2010-10-20 22:17:28 +0200
committerJan Kara <jack@suse.cz>2011-01-06 17:03:55 +0100
commitc03cad241af63445b751781a09faf08b3a5b77c1 (patch)
tree2e6f329259d442c23829c218a21977bbd6a5d248 /fs/udf/super.c
parent949f4a7c08bc4a050eae7aeeac3e6d019d1feafb (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.c3
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);