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Release 4.11 fs/pnode.c

Directory: fs
/*
 *  linux/fs/pnode.c
 *
 * (C) Copyright IBM Corporation 2005.
 *      Released under GPL v2.
 *      Author : Ram Pai (linuxram@us.ibm.com)
 *
 */
#include <linux/mnt_namespace.h>
#include <linux/mount.h>
#include <linux/fs.h>
#include <linux/nsproxy.h>
#include "internal.h"
#include "pnode.h"

/* return the next shared peer mount of @p */

static inline struct mount *next_peer(struct mount *p) { return list_entry(p->mnt_share.next, struct mount, mnt_share); }

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Ram Pai2689.66%150.00%
Al Viro310.34%150.00%
Total29100.00%2100.00%


static inline struct mount *first_slave(struct mount *p) { return list_entry(p->mnt_slave_list.next, struct mount, mnt_slave); }

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Ram Pai2689.66%150.00%
Al Viro310.34%150.00%
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static inline struct mount *next_slave(struct mount *p) { return list_entry(p->mnt_slave.next, struct mount, mnt_slave); }

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Ram Pai2689.66%150.00%
Al Viro310.34%150.00%
Total29100.00%2100.00%


static struct mount *get_peer_under_root(struct mount *mnt, struct mnt_namespace *ns, const struct path *root) { struct mount *m = mnt; do { /* Check the namespace first for optimization */ if (m->mnt_ns == ns && is_path_reachable(m, m->mnt.mnt_root, root)) return m; m = next_peer(m); } while (m != mnt); return NULL; }

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Miklos Szeredi7193.42%133.33%
Al Viro56.58%266.67%
Total76100.00%3100.00%

/* * Get ID of closest dominating peer group having a representative * under the given root. * * Caller must hold namespace_sem */
int get_dominating_id(struct mount *mnt, const struct path *root) { struct mount *m; 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_group_id; } return 0; }

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Miklos Szeredi6695.65%150.00%
Al Viro34.35%150.00%
Total69100.00%2100.00%


static int do_make_slave(struct mount *mnt) { struct mount *master, *slave_mnt; if (list_empty(&mnt->mnt_share)) { if (IS_MNT_SHARED(mnt)) { mnt_release_group_id(mnt); CLEAR_MNT_SHARED(mnt); } master = mnt->mnt_master; if (!master) { struct list_head *p = &mnt->mnt_slave_list; while (!list_empty(p)) { slave_mnt = list_first_entry(p, struct mount, mnt_slave); list_del_init(&slave_mnt->mnt_slave); slave_mnt->mnt_master = NULL; } return 0; } } else { struct mount *m; /* * slave 'mnt' to a peer mount that has the * same root dentry. If none is available then * slave it to anything that is available. */ for (m = master = next_peer(mnt); m != mnt; m = next_peer(m)) { if (m->mnt.mnt_root == mnt->mnt.mnt_root) { master = m; break; } } list_del_init(&mnt->mnt_share); mnt->mnt_group_id = 0; CLEAR_MNT_SHARED(mnt); } list_for_each_entry(slave_mnt, &mnt->mnt_slave_list, mnt_slave) slave_mnt->mnt_master = master; list_move(&mnt->mnt_slave, &master->mnt_slave_list); list_splice(&mnt->mnt_slave_list, master->mnt_slave_list.prev); INIT_LIST_HEAD(&mnt->mnt_slave_list); mnt->mnt_master = master; return 0; }

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Al Viro12551.44%342.86%
Ram Pai9739.92%114.29%
Miklos Szeredi187.41%114.29%
Takashi Iwai20.82%114.29%
Akinobu Mita10.41%114.29%
Total243100.00%7100.00%

/* * vfsmount lock must be held for write */
void change_mnt_propagation(struct mount *mnt, int type) { if (type == MS_SHARED) { set_mnt_shared(mnt); return; } do_make_slave(mnt); if (type != MS_SLAVE) { list_del_init(&mnt->mnt_slave); mnt->mnt_master = NULL; if (type == MS_UNBINDABLE) mnt->mnt.mnt_flags |= MNT_UNBINDABLE; else mnt->mnt.mnt_flags &= ~MNT_UNBINDABLE; } }

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Ram Pai6583.33%571.43%
Andries E. Brouwer810.26%114.29%
Al Viro56.41%114.29%
Total78100.00%7100.00%

/* * get the next mount in the propagation tree. * @m: the mount seen last * @origin: the original mount from where the tree walk initiated * * Note that peer groups form contiguous segments of slave lists. * We rely on that in get_source() to be able to find out if * vfsmount found while iterating with propagation_next() is * a peer of one we'd found earlier. */
static struct mount *propagation_next(struct mount *m, struct mount *origin) { /* are there any slaves of this mount? */ if (!IS_MNT_NEW(m) && !list_empty(&m->mnt_slave_list)) return first_slave(m); while (1) { struct mount *master = m->mnt_master; if (master == origin->mnt_master) { struct mount *next = next_peer(m); return (next == origin) ? NULL : next; } else if (m->mnt_slave.next != &master->mnt_slave_list) return next_slave(m); /* back at master */ m = master; } }

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Ram Pai10492.04%266.67%
Al Viro97.96%133.33%
Total113100.00%3100.00%


static struct mount *next_group(struct mount *m, struct mount *origin) { while (1) { while (1) { struct mount *next; if (!IS_MNT_NEW(m) && !list_empty(&m->mnt_slave_list)) return first_slave(m); next = next_peer(m); if (m->mnt_group_id == origin->mnt_group_id) { if (next == origin) return NULL; } else if (m->mnt_slave.next != &next->mnt_slave) break; m = next; } /* m is the last peer */ while (1) { struct mount *master = m->mnt_master; if (m->mnt_slave.next != &master->mnt_slave_list) return next_slave(m); m = next_peer(master); if (master->mnt_group_id == origin->mnt_group_id) break; if (master->mnt_slave.next == &m->mnt_slave) break; m = master; } if (m == origin) return NULL; } }

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Al Viro16991.35%250.00%
Ram Pai168.65%250.00%
Total185100.00%4100.00%

/* all accesses are serialized by namespace_sem */ static struct user_namespace *user_ns; static struct mount *last_dest, *first_source, *last_source, *dest_master; static struct mountpoint *mp; static struct hlist_head *list;
static inline bool peers(struct mount *m1, struct mount *m2) { return m1->mnt_group_id == m2->mnt_group_id && m1->mnt_group_id; }

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Maxim Patlasov30100.00%1100.00%
Total30100.00%1100.00%


static int propagate_one(struct mount *m) { struct mount *child; int type; /* skip ones added by this propagate_mnt() */ if (IS_MNT_NEW(m)) return 0; /* skip if mountpoint isn't covered by it */ if (!is_subdir(mp->m_dentry, m->mnt.mnt_root)) return 0; if (peers(m, last_dest)) { type = CL_MAKE_SHARED; } else { struct mount *n, *p; bool done; for (n = m; ; n = p) { p = n->mnt_master; if (p == dest_master || IS_MNT_MARKED(p)) break; } do { struct mount *parent = last_source->mnt_parent; if (last_source == first_source) break; done = parent->mnt_master == p; if (done && peers(n, parent)) break; last_source = last_source->mnt_master; } while (!done); type = CL_SLAVE; /* beginning of peer group among the slaves? */ if (IS_MNT_SHARED(m)) type |= CL_MAKE_SHARED; } /* Notice when we are propagating across user namespaces */ if (m->mnt_ns->user_ns != user_ns) type |= CL_UNPRIVILEGED; child = copy_tree(last_source, last_source->mnt.mnt_root, type); if (IS_ERR(child)) return PTR_ERR(child); child->mnt.mnt_flags &= ~MNT_LOCKED; mnt_set_mountpoint(m, mp, child); last_dest = m; last_source = child; if (m->mnt_master != dest_master) { read_seqlock_excl(&mount_lock); SET_MNT_MARK(m->mnt_master); read_sequnlock_excl(&mount_lock); } hlist_add_head(&child->mnt_hash, list); return count_mounts(m->mnt_ns, child); }

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Al Viro20669.83%225.00%
Eric W. Biedermann5117.29%337.50%
Ram Pai3010.17%225.00%
Maxim Patlasov82.71%112.50%
Total295100.00%8100.00%

/* * mount 'source_mnt' under the destination 'dest_mnt' at * dentry 'dest_dentry'. And propagate that mount to * all the peer and slave mounts of 'dest_mnt'. * Link all the new mounts into a propagation tree headed at * source_mnt. Also link all the new mounts using ->mnt_list * headed at source_mnt's ->mnt_list * * @dest_mnt: destination mount. * @dest_dentry: destination dentry. * @source_mnt: source mount. * @tree_list : list of heads of trees to be attached. */
int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp, struct mount *source_mnt, struct hlist_head *tree_list) { struct mount *m, *n; int ret = 0; /* * we don't want to bother passing tons of arguments to * propagate_one(); everything is serialized by namespace_sem, * so globals will do just fine. */ user_ns = current->nsproxy->mnt_ns->user_ns; last_dest = dest_mnt; first_source = source_mnt; last_source = source_mnt; mp = dest_mp; list = tree_list; dest_master = dest_mnt->mnt_master; /* all peers of dest_mnt, except dest_mnt itself */ for (n = next_peer(dest_mnt); n != dest_mnt; n = next_peer(n)) { ret = propagate_one(n); if (ret) goto out; } /* all slave groups */ for (m = next_group(dest_mnt, dest_mnt); m; m = next_group(m, dest_mnt)) { /* everything in that slave group */ n = m; do { ret = propagate_one(n); if (ret) goto out; n = next_peer(n); } while (n != m); } out: read_seqlock_excl(&mount_lock); hlist_for_each_entry(n, tree_list, mnt_hash) { m = n->mnt_parent; if (m->mnt_master != dest_mnt->mnt_master) CLEAR_MNT_MARK(m->mnt_master); } read_sequnlock_excl(&mount_lock); return ret; }

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Al Viro12556.05%550.00%
Ram Pai8939.91%220.00%
Eric W. Biedermann62.69%220.00%
David Howells31.35%110.00%
Total223100.00%10100.00%


static struct mount *find_topper(struct mount *mnt) { /* If there is exactly one mount covering mnt completely return it. */ struct mount *child; if (!list_is_singular(&mnt->mnt_mounts)) return NULL; child = list_first_entry(&mnt->mnt_mounts, struct mount, mnt_child); if (child->mnt_mountpoint != mnt->mnt.mnt_root) return NULL; return child; }

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Eric W. Biedermann66100.00%1100.00%
Total66100.00%1100.00%

/* * return true if the refcount is greater than count */
static inline int do_refcount_check(struct mount *mnt, int count) { return mnt_get_count(mnt) > count; }

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Ram Pai2086.96%125.00%
Al Viro28.70%250.00%
Nicholas Piggin14.35%125.00%
Total23100.00%4100.00%

/* * check if the mount 'mnt' can be unmounted successfully. * @mnt: the mount to be checked for unmount * NOTE: unmounting 'mnt' would naturally propagate to all * other mounts its parent propagates to. * Check if any of these mounts that **do not have submounts** * have more references than 'refcnt'. If so return busy. * * vfsmount lock must be held for write */
int propagate_mount_busy(struct mount *mnt, int refcnt) { struct mount *m, *child, *topper; struct mount *parent = mnt->mnt_parent; if (mnt == parent) return do_refcount_check(mnt, refcnt); /* * quickly check if the current mount can be unmounted. * If not, we don't have to go checking for all other * mounts */ if (!list_empty(&mnt->mnt_mounts) || do_refcount_check(mnt, refcnt)) return 1; for (m = propagation_next(parent, parent); m; m = propagation_next(m, parent)) { int count = 1; child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint); if (!child) continue; /* Is there exactly one mount on the child that covers * it completely whose reference should be ignored? */ topper = find_topper(child); if (topper) count += 1; else if (!list_empty(&child->mnt_mounts)) continue; if (do_refcount_check(child, count)) return 1; } return 0; }

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Ram Pai11470.37%120.00%
Eric W. Biedermann4125.31%120.00%
Al Viro74.32%360.00%
Total162100.00%5100.00%

/* * Clear MNT_LOCKED when it can be shown to be safe. * * mount_lock lock must be held for write */
void propagate_mount_unlock(struct mount *mnt) { struct mount *parent = mnt->mnt_parent; struct mount *m, *child; BUG_ON(parent == mnt); for (m = propagation_next(parent, parent); m; m = propagation_next(m, parent)) { child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint); if (child) child->mnt.mnt_flags &= ~MNT_LOCKED; } }

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Eric W. Biedermann85100.00%2100.00%
Total85100.00%2100.00%

/* * Mark all mounts that the MNT_LOCKED logic will allow to be unmounted. */
static void mark_umount_candidates(struct mount *mnt) { struct mount *parent = mnt->mnt_parent; struct mount *m; BUG_ON(parent == mnt); for (m = propagation_next(parent, parent); m; m = propagation_next(m, parent)) { struct mount *child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint); if (!child || (child->mnt.mnt_flags & MNT_UMOUNT)) continue; if (!IS_MNT_LOCKED(child) || IS_MNT_MARKED(m)) { SET_MNT_MARK(child); } } }

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Eric W. Biedermann109100.00%2100.00%
Total109100.00%2100.00%

/* * NOTE: unmounting 'mnt' naturally propagates to all other mounts its * parent propagates to. */
static void __propagate_umount(struct mount *mnt) { struct mount *parent = mnt->mnt_parent; struct mount *m; BUG_ON(parent == mnt); for (m = propagation_next(parent, parent); m; m = propagation_next(m, parent)) { struct mount *topper; struct mount *child = __lookup_mnt(&m->mnt, mnt->mnt_mountpoint); /* * umount the child only if the child has no children * and the child is marked safe to unmount. */ if (!child || !IS_MNT_MARKED(child)) continue; CLEAR_MNT_MARK(child); /* If there is exactly one mount covering all of child * replace child with that mount. */ topper = find_topper(child); if (topper) mnt_change_mountpoint(child->mnt_parent, child->mnt_mp, topper); if (list_empty(&child->mnt_mounts)) { list_del_init(&child->mnt_child); child->mnt.mnt_flags |= MNT_UMOUNT; list_move_tail(&child->mnt_list, &mnt->mnt_list); } } }

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Ram Pai8653.09%19.09%
Eric W. Biedermann5936.42%436.36%
Al Viro1710.49%654.55%
Total162100.00%11100.00%

/* * collect all mounts that receive propagation from the mount in @list, * and return these additional mounts in the same list. * @list: the list of mounts to be unmounted. * * vfsmount lock must be held for write */
int propagate_umount(struct list_head *list) { struct mount *mnt; list_for_each_entry_reverse(mnt, list, mnt_list) mark_umount_candidates(mnt); list_for_each_entry(mnt, list, mnt_list) __propagate_umount(mnt); return 0; }

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Ram Pai2761.36%125.00%
Eric W. Biedermann1636.36%250.00%
Al Viro12.27%125.00%
Total44100.00%4100.00%


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PersonTokensPropCommitsCommitProp
Ram Pai74635.29%715.91%
Al Viro71433.77%1840.91%
Eric W. Biedermann44120.86%920.45%
Miklos Szeredi1567.38%24.55%
Maxim Patlasov381.80%12.27%
Andries E. Brouwer80.38%12.27%
Nicholas Piggin40.19%24.55%
David Howells30.14%12.27%
Takashi Iwai20.09%12.27%
Kirill Korotaev10.05%12.27%
Akinobu Mita10.05%12.27%
Total2114100.00%44100.00%
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