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OpenCloudOS-Kernel
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vfs: mnt_id/mnt_group_id moved 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-11-25 00:50:41 -05:00
parent 143c8c91ce
commit 15169fe784
5 changed files with 22 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/fhandle.c
View File

@ -10,6 +10,7 @@
#include <linux/personality.h>
#include <asm/uaccess.h>
#include "internal.h"
#include "mount.h"
static long do_sys_name_to_handle(struct path *path,
struct file_handle __user *ufh,
@ -66,7 +67,8 @@ static long do_sys_name_to_handle(struct path *path,
} else
retval = 0;
/* copy the mount id */
if (copy_to_user(mnt_id, &path->mnt->mnt_id, sizeof(*mnt_id)) ||
if (copy_to_user(mnt_id, &real_mount(path->mnt)->mnt_id,
sizeof(*mnt_id)) ||
copy_to_user(ufh, handle,
sizeof(struct file_handle) + handle_bytes))
retval = -EFAULT;

2
fs/mount.h
View File

@ -26,6 +26,8 @@ struct mount {
struct list_head mnt_slave; /* slave list entry */
struct mount *mnt_master; /* slave is on master->mnt_slave_list */
struct mnt_namespace *mnt_ns; /* containing namespace */
int mnt_id; /* mount identifier */
int mnt_group_id; /* peer group identifier */
};
static inline struct mount *real_mount(struct vfsmount *mnt)

30
fs/namespace.c
View File

@ -85,9 +85,9 @@ static int mnt_alloc_id(struct mount *mnt)
retry:
ida_pre_get(&mnt_id_ida, GFP_KERNEL);
spin_lock(&mnt_id_lock);
res = ida_get_new_above(&mnt_id_ida, mnt_id_start, &mnt->mnt.mnt_id);
res = ida_get_new_above(&mnt_id_ida, mnt_id_start, &mnt->mnt_id);
if (!res)
mnt_id_start = mnt->mnt.mnt_id + 1;
mnt_id_start = mnt->mnt_id + 1;
spin_unlock(&mnt_id_lock);
if (res == -EAGAIN)
goto retry;
@ -97,7 +97,7 @@ retry:
static void mnt_free_id(struct mount *mnt)
{
int id = mnt->mnt.mnt_id;
int id = mnt->mnt_id;
spin_lock(&mnt_id_lock);
ida_remove(&mnt_id_ida, id);
if (mnt_id_start > id)
@ -119,9 +119,9 @@ static int mnt_alloc_group_id(struct mount *mnt)
res = ida_get_new_above(&mnt_group_ida,
mnt_group_start,
&mnt->mnt.mnt_group_id);
&mnt->mnt_group_id);
if (!res)
mnt_group_start = mnt->mnt.mnt_group_id + 1;
mnt_group_start = mnt->mnt_group_id + 1;
return res;
}
@ -131,11 +131,11 @@ static int mnt_alloc_group_id(struct mount *mnt)
*/
void mnt_release_group_id(struct mount *mnt)
{
int id = mnt->mnt.mnt_group_id;
int id = mnt->mnt_group_id;
ida_remove(&mnt_group_ida, id);
if (mnt_group_start > id)
mnt_group_start = id;
mnt->mnt.mnt_group_id = 0;
mnt->mnt_group_id = 0;
}
/*
@ -696,11 +696,11 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
if (mnt) {
if (flag & (CL_SLAVE | CL_PRIVATE))
mnt->mnt.mnt_group_id = 0; /* not a peer of original */
mnt->mnt_group_id = 0; /* not a peer of original */
else
mnt->mnt.mnt_group_id = old->mnt.mnt_group_id;
mnt->mnt_group_id = old->mnt_group_id;
if ((flag & CL_MAKE_SHARED) && !mnt->mnt.mnt_group_id) {
if ((flag & CL_MAKE_SHARED) && !mnt->mnt_group_id) {
int err = mnt_alloc_group_id(mnt);
if (err)
goto out_free;
@ -1029,7 +1029,7 @@ static int show_mountinfo(struct seq_file *m, void *v)
struct path root = p->root;
int err = 0;
seq_printf(m, "%i %i %u:%u ", mnt->mnt_id, r->mnt_parent->mnt.mnt_id,
seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id,
MAJOR(sb->s_dev), MINOR(sb->s_dev));
if (sb->s_op->show_path)
err = sb->s_op->show_path(m, mnt);
@ -1049,9 +1049,9 @@ static int show_mountinfo(struct seq_file *m, void *v)
/* Tagged fields ("foo:X" or "bar") */
if (IS_MNT_SHARED(mnt))
seq_printf(m, " shared:%i", mnt->mnt_group_id);
seq_printf(m, " shared:%i", r->mnt_group_id);
if (IS_MNT_SLAVE(r)) {
int master = r->mnt_master->mnt.mnt_group_id;
int master = r->mnt_master->mnt_group_id;
int dom = get_dominating_id(r, &p->root);
seq_printf(m, " master:%i", master);
if (dom && dom != master)
@ -1507,7 +1507,7 @@ static void cleanup_group_ids(struct mount *mnt, struct mount *end)
struct mount *p;
for (p = mnt; p != end; p = next_mnt(p, &mnt->mnt)) {
if (p->mnt.mnt_group_id && !IS_MNT_SHARED(&p->mnt))
if (p->mnt_group_id && !IS_MNT_SHARED(&p->mnt))
mnt_release_group_id(p);
}
}
@ -1517,7 +1517,7 @@ static int invent_group_ids(struct mount *mnt, bool recurse)
struct mount *p;
for (p = mnt; p; p = recurse ? next_mnt(p, &mnt->mnt) : NULL) {
if (!p->mnt.mnt_group_id && !IS_MNT_SHARED(&p->mnt)) {
if (!p->mnt_group_id && !IS_MNT_SHARED(&p->mnt)) {
int err = mnt_alloc_group_id(p);
if (err) {
cleanup_group_ids(mnt, p);

4
fs/pnode.c
View File

@ -58,7 +58,7 @@ int get_dominating_id(struct mount *mnt, const struct path *root)
for (m = mnt->mnt_master; m != NULL; m = m->mnt_master) {
struct mount *d = get_peer_under_root(m, mnt->mnt_ns, root);
if (d)
return d->mnt.mnt_group_id;
return d->mnt_group_id;
}
return 0;
@ -86,7 +86,7 @@ static int do_make_slave(struct mount *mnt)
mnt_release_group_id(mnt);
list_del_init(&mnt->mnt_share);
mnt->mnt.mnt_group_id = 0;
mnt->mnt_group_id = 0;
if (peer_mnt)
master = peer_mnt;

2
include/linux/mount.h
View File

@ -58,8 +58,6 @@ struct vfsmount {
#endif
const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
struct list_head mnt_list;
int mnt_id; /* mount identifier */
int mnt_group_id; /* peer group identifier */
int mnt_expiry_mark; /* true if marked for expiry */
int mnt_pinned;
int mnt_ghosts;