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udf: Preserve link count of system files
System files in UDF filesystem have link count 0. To not confuse VFS we fudge the link count to be 1 when reading such inodes however we forget to restore the link count of 0 when writing such inodes. Fix that. CC: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz>
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256fe4162f
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@ -1301,6 +1301,7 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode)
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ret = -EIO;
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goto out;
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}
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iinfo->i_hidden = hidden_inode;
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iinfo->i_unique = 0;
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iinfo->i_lenEAttr = 0;
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iinfo->i_lenExtents = 0;
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@ -1636,8 +1637,12 @@ static int udf_update_inode(struct inode *inode, int do_sync)
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if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
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fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
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else
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fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
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else {
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if (iinfo->i_hidden)
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fe->fileLinkCount = cpu_to_le16(0);
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else
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fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
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}
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fe->informationLength = cpu_to_le64(inode->i_size);
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@ -147,6 +147,7 @@ static struct inode *udf_alloc_inode(struct super_block *sb)
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ei->i_next_alloc_goal = 0;
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ei->i_strat4096 = 0;
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ei->i_streamdir = 0;
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ei->i_hidden = 0;
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init_rwsem(&ei->i_data_sem);
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ei->cached_extent.lstart = -1;
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spin_lock_init(&ei->i_extent_cache_lock);
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@ -44,7 +44,8 @@ struct udf_inode_info {
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unsigned i_use : 1; /* unallocSpaceEntry */
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unsigned i_strat4096 : 1;
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unsigned i_streamdir : 1;
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unsigned reserved : 25;
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unsigned i_hidden : 1; /* hidden system inode */
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unsigned reserved : 24;
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__u8 *i_data;
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struct kernel_lb_addr i_locStreamdir;
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__u64 i_lenStreams;
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