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xenfs: Use proc_create_mount_point() to create /proc/xen

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Mounting proc in user namespace containers fails if the xenbus
filesystem is mounted on /proc/xen because this directory fails
the "permanently empty" test. proc_create_mount_point() exists
specifically to create such mountpoints in proc but is currently
proc-internal. Export this interface to modules, then use it in
xenbus when creating /proc/xen.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Seth Forshee 2016-11-14 11:12:56 +00:00 committed by Juergen Gross
parent 1ea55e8078
commit f97df70b1c
4 changed files with 4 additions and 2 deletions
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2
drivers/xen/xenbus/xenbus_probe.c
View File

@ -826,7 +826,7 @@ static int __init xenbus_init(void)
* Create xenfs mountpoint in /proc for compatibility with
* utilities that expect to find "xenbus" under "/proc/xen".
*/
proc_mkdir("xen", NULL);
proc_create_mount_point("xen");
#endif
out_error:

1
fs/proc/generic.c
View File

@ -479,6 +479,7 @@ struct proc_dir_entry *proc_create_mount_point(const char *name)
}
return ent;
}
EXPORT_SYMBOL(proc_create_mount_point);
struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
struct proc_dir_entry *parent,

1
fs/proc/internal.h
View File

@ -195,7 +195,6 @@ static inline bool is_empty_pde(const struct proc_dir_entry *pde)
{
return S_ISDIR(pde->mode) && !pde->proc_iops;
}
struct proc_dir_entry *proc_create_mount_point(const char *name);
/*
* inode.c

2
include/linux/proc_fs.h
View File

@ -21,6 +21,7 @@ extern struct proc_dir_entry *proc_mkdir_data(const char *, umode_t,
struct proc_dir_entry *, void *);
extern struct proc_dir_entry *proc_mkdir_mode(const char *, umode_t,
struct proc_dir_entry *);
struct proc_dir_entry *proc_create_mount_point(const char *name);
extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
struct proc_dir_entry *,
@ -56,6 +57,7 @@ static inline struct proc_dir_entry *proc_symlink(const char *name,
struct proc_dir_entry *parent,const char *dest) { return NULL;}
static inline struct proc_dir_entry *proc_mkdir(const char *name,
struct proc_dir_entry *parent) {return NULL;}
static inline struct proc_dir_entry *proc_create_mount_point(const char *name) { return NULL; }
static inline struct proc_dir_entry *proc_mkdir_data(const char *name,
umode_t mode, struct proc_dir_entry *parent, void *data) { return NULL; }
static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,