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xfs: lift cursor copy in/out into xfs_ioc_attr_list

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Lift the common code to copy the cursor from and to user space into
xfs_ioc_attr_list.  Note that this means we copy in twice now as
the cursor is in the middle of the conaining structure, but we never
touch the memory for the original copy.  Doing so keeps the cursor
handling isolated in the common helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig
2020-02-26 17:30:41 -08:00
committed by Darrick J. Wong
parent eb241c7474
commit 53ac39fdb3
3 changed files with 20 additions and 37 deletions
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2
fs/xfs/xfs_ioctl.h
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@@ -40,7 +40,7 @@ int xfs_ioc_attrmulti_one(struct file *parfilp, struct inode *inode,
uint32_t opcode, void __user *uname, void __user *value,
uint32_t *len, uint32_t flags);
int xfs_ioc_attr_list(struct xfs_inode *dp, void __user *ubuf, int bufsize,
int flags, struct attrlist_cursor_kern *cursor);
int flags, struct xfs_attrlist_cursor __user *ucursor);
extern struct dentry *
xfs_handle_to_dentry(