From c03cad241af63445b751781a09faf08b3a5b77c1 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 20 Oct 2010 22:17:28 +0200 Subject: 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 --- fs/udf/inode.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) (limited to 'fs/udf/inode.c') diff --git a/fs/udf/inode.c b/fs/udf/inode.c index 9656907f4b8..fa3c1541151 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) << -- cgit v1.2.3-70-g09d2