On Tue, Jun 15, 2010 at 10:42:54PM +0530, Aneesh Kumar K.V wrote:
> The patch update may_open to allow handle based open on symlinks.
> The file handle based API use file descritor returned from open_by_handle_at
> to do different file system operations. To find the link target name we
> need to get a file descriptor on symlinks.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> ---
> fs/namei.c | 17 ++++++++++++++---
> 1 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/fs/namei.c b/fs/namei.c
> index c2d19c7..417bf53 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -1422,7 +1422,7 @@ int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
> return error;
> }
>
> -int may_open(struct path *path, int acc_mode, int flag)
> +static int __may_open(struct path *path, int acc_mode, int flag, int handle)
> {
> struct dentry *dentry = path->dentry;
> struct inode *inode = dentry->d_inode;
> @@ -1433,7 +1433,13 @@ int may_open(struct path *path, int acc_mode, int flag)
>
> switch (inode->i_mode & S_IFMT) {
> case S_IFLNK:
> - return -ELOOP;
> + /*
> + * For file handle based open we should allow
> + * open of symlink.
> + */
> + if (!handle)
> + return -ELOOP;
> + break;
> case S_IFDIR:
> if (acc_mode & MAY_WRITE)
> return -EISDIR;
> @@ -1473,6 +1479,11 @@ int may_open(struct path *path, int acc_mode, int flag)
> return break_lease(inode, flag);
> }
>
> +int may_open(struct path *path, int acc_mode, int flag)
> +{
> + return __may_open(path, acc_mode, flag, 0);
> +}
Why don't you just add MAY_OPEN_LNK instead of this ugliness?
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