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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * | |
3 | * Definitions for mount interface. This describes the in the kernel build | |
4 | * linkedlist with mounted filesystems. | |
5 | * | |
6 | * Author: Marco van Wieringen <mvw@planets.elm.net> | |
7 | * | |
1da177e4 LT |
8 | */ |
9 | #ifndef _LINUX_MOUNT_H | |
10 | #define _LINUX_MOUNT_H | |
1da177e4 | 11 | |
d53d9f16 | 12 | #include <linux/types.h> |
1da177e4 | 13 | #include <linux/list.h> |
3d733633 | 14 | #include <linux/nodemask.h> |
1da177e4 LT |
15 | #include <linux/spinlock.h> |
16 | #include <asm/atomic.h> | |
17 | ||
726c3342 DH |
18 | struct super_block; |
19 | struct vfsmount; | |
20 | struct dentry; | |
6b3286ed | 21 | struct mnt_namespace; |
726c3342 | 22 | |
07b20889 RP |
23 | #define MNT_NOSUID 0x01 |
24 | #define MNT_NODEV 0x02 | |
25 | #define MNT_NOEXEC 0x04 | |
fc33a7bb CH |
26 | #define MNT_NOATIME 0x08 |
27 | #define MNT_NODIRATIME 0x10 | |
47ae32d6 | 28 | #define MNT_RELATIME 0x20 |
2e4b7fcd | 29 | #define MNT_READONLY 0x40 /* does the user want this to be r/o? */ |
bf066c7d | 30 | |
5528f911 | 31 | #define MNT_SHRINKABLE 0x100 |
3d733633 | 32 | #define MNT_IMBALANCED_WRITE_COUNT 0x200 /* just for debugging */ |
5528f911 | 33 | |
fc33a7bb CH |
34 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
35 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ | |
beb7dd86 | 36 | #define MNT_PNODE_MASK 0x3000 /* propagation flag mask */ |
1da177e4 | 37 | |
07b20889 | 38 | struct vfsmount { |
1da177e4 LT |
39 | struct list_head mnt_hash; |
40 | struct vfsmount *mnt_parent; /* fs we are mounted on */ | |
41 | struct dentry *mnt_mountpoint; /* dentry of mountpoint */ | |
42 | struct dentry *mnt_root; /* root of the mounted tree */ | |
43 | struct super_block *mnt_sb; /* pointer to superblock */ | |
44 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
45 | struct list_head mnt_child; /* and going through their mnt_child */ | |
1da177e4 | 46 | int mnt_flags; |
4ba4d4c0 | 47 | /* 4 bytes hole on 64bits arches */ |
88b38782 | 48 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
1da177e4 | 49 | struct list_head mnt_list; |
55e700b9 | 50 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
03e06e68 | 51 | struct list_head mnt_share; /* circular list of shared mounts */ |
a58b0eb8 RP |
52 | struct list_head mnt_slave_list;/* list of slave mounts */ |
53 | struct list_head mnt_slave; /* slave list entry */ | |
54 | struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ | |
6b3286ed | 55 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
73cd49ec | 56 | int mnt_id; /* mount identifier */ |
719f5d7f | 57 | int mnt_group_id; /* peer group identifier */ |
4ba4d4c0 ED |
58 | /* |
59 | * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount | |
60 | * to let these frequently modified fields in a separate cache line | |
61 | * (so that reads of mnt_flags wont ping-pong on SMP machines) | |
62 | */ | |
63 | atomic_t mnt_count; | |
64 | int mnt_expiry_mark; /* true if marked for expiry */ | |
7b7b1ace | 65 | int mnt_pinned; |
7c4b93d8 | 66 | int mnt_ghosts; |
3d733633 DH |
67 | /* |
68 | * This value is not stable unless all of the mnt_writers[] spinlocks | |
69 | * are held, and all mnt_writer[]s on this mount have 0 as their ->count | |
70 | */ | |
71 | atomic_t __mnt_writers; | |
1da177e4 LT |
72 | }; |
73 | ||
74 | static inline struct vfsmount *mntget(struct vfsmount *mnt) | |
75 | { | |
76 | if (mnt) | |
77 | atomic_inc(&mnt->mnt_count); | |
78 | return mnt; | |
79 | } | |
80 | ||
8366025e DH |
81 | extern int mnt_want_write(struct vfsmount *mnt); |
82 | extern void mnt_drop_write(struct vfsmount *mnt); | |
7b7b1ace AV |
83 | extern void mntput_no_expire(struct vfsmount *mnt); |
84 | extern void mnt_pin(struct vfsmount *mnt); | |
85 | extern void mnt_unpin(struct vfsmount *mnt); | |
8366025e | 86 | extern int __mnt_is_readonly(struct vfsmount *mnt); |
1da177e4 LT |
87 | |
88 | static inline void mntput(struct vfsmount *mnt) | |
89 | { | |
90 | if (mnt) { | |
91 | mnt->mnt_expiry_mark = 0; | |
751c404b | 92 | mntput_no_expire(mnt); |
1da177e4 LT |
93 | } |
94 | } | |
95 | ||
1da177e4 LT |
96 | extern struct vfsmount *do_kern_mount(const char *fstype, int flags, |
97 | const char *name, void *data); | |
98 | ||
bb4a58bf TM |
99 | struct file_system_type; |
100 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, | |
101 | int flags, const char *name, | |
102 | void *data); | |
103 | ||
1da177e4 LT |
104 | struct nameidata; |
105 | ||
8d66bf54 AV |
106 | struct path; |
107 | extern int do_add_mount(struct vfsmount *newmnt, struct path *path, | |
1da177e4 LT |
108 | int mnt_flags, struct list_head *fslist); |
109 | ||
110 | extern void mark_mounts_for_expiry(struct list_head *mounts); | |
111 | ||
112 | extern spinlock_t vfsmount_lock; | |
d53d9f16 | 113 | extern dev_t name_to_dev_t(char *name); |
1da177e4 | 114 | |
1da177e4 | 115 | #endif /* _LINUX_MOUNT_H */ |