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linux-2.6/fs/mount.h

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vfs: new internal helper: mnt_has_parent(mnt) vfsmounts have ->mnt_parent pointing either to a different vfsmount or to itself; it's never NULL and termination condition in loops traversing the tree towards root is mnt == mnt->mnt_parent. At least one place (see the next patch) is confused about what's going on; let's add an explicit helper checking it right way and use it in all places where we need it. Not that there had been too many, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-24 00:26:23 +00:00
#include <linux/mount.h>
vfs: all counters taken to struct mount Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 03:53:09 +00:00
struct mnt_pcp {
int mnt_count;
int mnt_writers;
};
vfs: start hiding vfsmount guts series Almost all fields of struct vfsmount are used only by core VFS (and a fairly small part of it, at that). The plan: embed struct vfsmount into struct mount, making the latter visible only to core parts of VFS. Then move fields from vfsmount to mount, eventually leaving only mnt_root/mnt_sb/mnt_flags in struct vfsmount. Filesystem code still gets pointers to struct vfsmount and remains unchanged; all such pointers go to struct vfsmount embedded into the instances of struct mount allocated by fs/namespace.c. When fs/namespace.c et.al. get a pointer to vfsmount, they turn it into pointer to mount (using container_of) and work with that. This is the first part of series; struct mount is introduced, allocation switched to using it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-23 17:14:10 +00:00
struct mount {
vfs: the first spoils - mnt_hash moved taken out of struct vfsmount into struct mount Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 02:01:32 +00:00
struct list_head mnt_hash;
vfs: now it can be done - make mnt_parent point to struct mount Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 03:19:58 +00:00
struct mount *mnt_parent;
vfs: move mnt_mountpoint to struct mount Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 03:25:07 +00:00
struct dentry *mnt_mountpoint;
vfs: start hiding vfsmount guts series Almost all fields of struct vfsmount are used only by core VFS (and a fairly small part of it, at that). The plan: embed struct vfsmount into struct mount, making the latter visible only to core parts of VFS. Then move fields from vfsmount to mount, eventually leaving only mnt_root/mnt_sb/mnt_flags in struct vfsmount. Filesystem code still gets pointers to struct vfsmount and remains unchanged; all such pointers go to struct vfsmount embedded into the instances of struct mount allocated by fs/namespace.c. When fs/namespace.c et.al. get a pointer to vfsmount, they turn it into pointer to mount (using container_of) and work with that. This is the first part of series; struct mount is introduced, allocation switched to using it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-23 17:14:10 +00:00
struct vfsmount mnt;
vfs: all counters taken to struct mount Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 03:53:09 +00:00
#ifdef CONFIG_SMP
struct mnt_pcp __percpu *mnt_pcp;
atomic_t mnt_longterm; /* how many of the refs are longterm */
#else
int mnt_count;
int mnt_writers;
#endif
vfs: start hiding vfsmount guts series Almost all fields of struct vfsmount are used only by core VFS (and a fairly small part of it, at that). The plan: embed struct vfsmount into struct mount, making the latter visible only to core parts of VFS. Then move fields from vfsmount to mount, eventually leaving only mnt_root/mnt_sb/mnt_flags in struct vfsmount. Filesystem code still gets pointers to struct vfsmount and remains unchanged; all such pointers go to struct vfsmount embedded into the instances of struct mount allocated by fs/namespace.c. When fs/namespace.c et.al. get a pointer to vfsmount, they turn it into pointer to mount (using container_of) and work with that. This is the first part of series; struct mount is introduced, allocation switched to using it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-23 17:14:10 +00:00
};
static inline struct mount *real_mount(struct vfsmount *mnt)
{
return container_of(mnt, struct mount, mnt);
}
vfs: spread struct mount - mnt_has_parent Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 02:47:05 +00:00
static inline int mnt_has_parent(struct mount *mnt)
vfs: new internal helper: mnt_has_parent(mnt) vfsmounts have ->mnt_parent pointing either to a different vfsmount or to itself; it's never NULL and termination condition in loops traversing the tree towards root is mnt == mnt->mnt_parent. At least one place (see the next patch) is confused about what's going on; let's add an explicit helper checking it right way and use it in all places where we need it. Not that there had been too many, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-24 00:26:23 +00:00
{
vfs: now it can be done - make mnt_parent point to struct mount Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 03:19:58 +00:00
return mnt != mnt->mnt_parent;
vfs: new internal helper: mnt_has_parent(mnt) vfsmounts have ->mnt_parent pointing either to a different vfsmount or to itself; it's never NULL and termination condition in loops traversing the tree towards root is mnt == mnt->mnt_parent. At least one place (see the next patch) is confused about what's going on; let's add an explicit helper checking it right way and use it in all places where we need it. Not that there had been too many, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-24 00:26:23 +00:00
}
vfs: spread struct mount - __lookup_mnt() result switch __lookup_mnt() to returning struct mount *; callers adjusted. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-24 23:22:03 +00:00
extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);