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authorJan Kara <jack@suse.cz>2010-10-21 00:17:28 +0400
committerJan Kara <jack@suse.cz>2011-01-06 19:03:55 +0300
commitc03cad241af63445b751781a09faf08b3a5b77c1 (patch)
tree2e6f329259d442c23829c218a21977bbd6a5d248 /fs/udf/inode.c
parent949f4a7c08bc4a050eae7aeeac3e6d019d1feafb (diff)
downloadlinux-c03cad241af63445b751781a09faf08b3a5b77c1.tar.xz
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/inode.c')
-rw-r--r--fs/udf/inode.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 9656907f4b81..fa3c1541151c 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1201,6 +1201,7 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
return;
}
+ read_lock(&sbi->s_cred_lock);
inode->i_uid = le32_to_cpu(fe->uid);
if (inode->i_uid == -1 ||
UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
@@ -1213,13 +1214,6 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
- inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
- if (!inode->i_nlink)
- inode->i_nlink = 1;
-
- inode->i_size = le64_to_cpu(fe->informationLength);
- iinfo->i_lenExtents = inode->i_size;
-
if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
sbi->s_fmode != UDF_INVALID_MODE)
inode->i_mode = sbi->s_fmode;
@@ -1229,6 +1223,14 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
else
inode->i_mode = udf_convert_permissions(fe);
inode->i_mode &= ~sbi->s_umask;
+ read_unlock(&sbi->s_cred_lock);
+
+ inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
+ if (!inode->i_nlink)
+ inode->i_nlink = 1;
+
+ inode->i_size = le64_to_cpu(fe->informationLength);
+ iinfo->i_lenExtents = inode->i_size;
if (iinfo->i_efe == 0) {
inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<