Differential D23915 Diff 69255 sys/fs/tmpfs/tmpfs_subr.c

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sys/fs/tmpfs/tmpfs_subr.c

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SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW \| CTLFLAG_MPSAFE, 0,		SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW \| CTLFLAG_MPSAFE, 0,
"tmpfs file system");		"tmpfs file system");

static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED;		static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED;

static uma_zone_t tmpfs_dirent_pool;		static uma_zone_t tmpfs_dirent_pool;
static uma_zone_t tmpfs_node_pool;		static uma_zone_t tmpfs_node_pool;
		VFS_SMR_DECLARE;

static int		static int
tmpfs_node_ctor(void mem, int size, void arg, int flags)		tmpfs_node_ctor(void mem, int size, void arg, int flags)
{		{
struct tmpfs_node *node;		struct tmpfs_node *node;

node = mem;		node = mem;
node->tn_gen++;		node->tn_gen++;
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tmpfs_subr_init(void)		tmpfs_subr_init(void)
{		{
tmpfs_dirent_pool = uma_zcreate("TMPFS dirent",		tmpfs_dirent_pool = uma_zcreate("TMPFS dirent",
sizeof(struct tmpfs_dirent), NULL, NULL, NULL, NULL,		sizeof(struct tmpfs_dirent), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);		UMA_ALIGN_PTR, 0);
tmpfs_node_pool = uma_zcreate("TMPFS node",		tmpfs_node_pool = uma_zcreate("TMPFS node",
sizeof(struct tmpfs_node), tmpfs_node_ctor, tmpfs_node_dtor,		sizeof(struct tmpfs_node), tmpfs_node_ctor, tmpfs_node_dtor,
tmpfs_node_init, tmpfs_node_fini, UMA_ALIGN_PTR, 0);		tmpfs_node_init, tmpfs_node_fini, UMA_ALIGN_PTR, 0);
		VFS_SMR_ZONE_SET(tmpfs_node_pool);
}		}

void		void
tmpfs_subr_uninit(void)		tmpfs_subr_uninit(void)
{		{
uma_zdestroy(tmpfs_node_pool);		uma_zdestroy(tmpfs_node_pool);
uma_zdestroy(tmpfs_dirent_pool);		uma_zdestroy(tmpfs_dirent_pool);
}		}
▲ Show 20 Lines • Show All 141 Lines • ▼ Show 20 Lines	if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
* Tmpfs does not need to instantiate new nodes during		* Tmpfs does not need to instantiate new nodes during
* unmount.		* unmount.
*/		*/
return (EBUSY);		return (EBUSY);
}		}
if ((mp->mnt_kern_flag & MNT_RDONLY) != 0)		if ((mp->mnt_kern_flag & MNT_RDONLY) != 0)
return (EROFS);		return (EROFS);

nnode = uma_zalloc_arg(tmpfs_node_pool, tmp, M_WAITOK);		nnode = uma_zalloc_smr(tmpfs_node_pool, M_WAITOK);

/* Generic initialization. */		/* Generic initialization. */
nnode->tn_type = type;		nnode->tn_type = type;
vfs_timestamp(&nnode->tn_atime);		vfs_timestamp(&nnode->tn_atime);
nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime =		nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime =
nnode->tn_atime;		nnode->tn_atime;
nnode->tn_uid = uid;		nnode->tn_uid = uid;
nnode->tn_gid = gid;		nnode->tn_gid = gid;
▲ Show 20 Lines • Show All 130 Lines • ▼ Show 20 Lines	if (uobj != NULL) {
vm_object_deallocate(uobj);		vm_object_deallocate(uobj);
}		}
break;		break;

default:		default:
panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type);		panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type);
}		}

uma_zfree(tmpfs_node_pool, node);		uma_zfree_smr(tmpfs_node_pool, node);
TMPFS_LOCK(tmp);		TMPFS_LOCK(tmp);
tmpfs_free_tmp(tmp);		tmpfs_free_tmp(tmp);
return (true);		return (true);
}		}

static __inline uint32_t		static __inline uint32_t
tmpfs_dirent_hash(const char *name, u_int len)		tmpfs_dirent_hash(const char *name, u_int len)
{		{
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/*		/*
* Change access mode on the given vnode.		* Change access mode on the given vnode.
* Caller should execute tmpfs_update on vp after a successful execution.		* Caller should execute tmpfs_update on vp after a successful execution.
* The vnode must be locked on entry and remain locked on exit.		* The vnode must be locked on entry and remain locked on exit.
*/		*/
int		int
tmpfs_chmod(struct vnode vp, mode_t mode, struct ucred cred, struct thread *p)		tmpfs_chmod(struct vnode vp, mode_t mode, struct ucred cred, struct thread *p)
{		{
int error;		int error, newmode;
struct tmpfs_node *node;		struct tmpfs_node *node;

ASSERT_VOP_ELOCKED(vp, "chmod");		ASSERT_VOP_ELOCKED(vp, "chmod");
		ASSERT_VOP_IN_SEQC(vp);

node = VP_TO_TMPFS_NODE(vp);		node = VP_TO_TMPFS_NODE(vp);

/* Disallow this operation if the file system is mounted read-only. */		/* Disallow this operation if the file system is mounted read-only. */
if (vp->v_mount->mnt_flag & MNT_RDONLY)		if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;		return EROFS;

/* Immutable or append-only files cannot be modified, either. */		/* Immutable or append-only files cannot be modified, either. */
Show All 17 Lines	if (priv_check_cred(cred, PRIV_VFS_STICKYFILE))
return (EFTYPE);		return (EFTYPE);
}		}
if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) {		if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) {
error = priv_check_cred(cred, PRIV_VFS_SETGID);		error = priv_check_cred(cred, PRIV_VFS_SETGID);
if (error)		if (error)
return (error);		return (error);
}		}

		newmode = node->tn_mode & ~ALLPERMS;
		newmode \|= mode & ALLPERMS;
		atomic_store_int(&node->tn_mode, newmode);

node->tn_mode &= ~ALLPERMS;
node->tn_mode \|= mode & ALLPERMS;

node->tn_status \|= TMPFS_NODE_CHANGED;		node->tn_status \|= TMPFS_NODE_CHANGED;

ASSERT_VOP_ELOCKED(vp, "chmod2");		ASSERT_VOP_ELOCKED(vp, "chmod2");

return (0);		return (0);
}		}

/*		/*
* Change ownership of the given vnode. At least one of uid or gid must		* Change ownership of the given vnode. At least one of uid or gid must
* be different than VNOVAL. If one is set to that value, the attribute		* be different than VNOVAL. If one is set to that value, the attribute
* is unchanged.		* is unchanged.
* Caller should execute tmpfs_update on vp after a successful execution.		* Caller should execute tmpfs_update on vp after a successful execution.
* The vnode must be locked on entry and remain locked on exit.		* The vnode must be locked on entry and remain locked on exit.
*/		*/
int		int
tmpfs_chown(struct vnode vp, uid_t uid, gid_t gid, struct ucred cred,		tmpfs_chown(struct vnode vp, uid_t uid, gid_t gid, struct ucred cred,
struct thread *p)		struct thread *p)
{		{
int error;		int error;
struct tmpfs_node *node;		struct tmpfs_node *node;
uid_t ouid;		uid_t ouid;
gid_t ogid;		gid_t ogid;

ASSERT_VOP_ELOCKED(vp, "chown");		ASSERT_VOP_ELOCKED(vp, "chown");
		ASSERT_VOP_IN_SEQC(vp);

node = VP_TO_TMPFS_NODE(vp);		node = VP_TO_TMPFS_NODE(vp);

/* Assign default values if they are unknown. */		/* Assign default values if they are unknown. */
MPASS(uid != VNOVAL \|\| gid != VNOVAL);		MPASS(uid != VNOVAL \|\| gid != VNOVAL);
if (uid == VNOVAL)		if (uid == VNOVAL)
uid = node->tn_uid;		uid = node->tn_uid;
if (gid == VNOVAL)		if (gid == VNOVAL)
Show All 30 Lines	tmpfs_chown(struct vnode vp, uid_t uid, gid_t gid, struct ucred cred,

node->tn_uid = uid;		node->tn_uid = uid;
node->tn_gid = gid;		node->tn_gid = gid;

node->tn_status \|= TMPFS_NODE_CHANGED;		node->tn_status \|= TMPFS_NODE_CHANGED;

if ((node->tn_mode & (S_ISUID \| S_ISGID)) && (ouid != uid \|\| ogid != gid)) {		if ((node->tn_mode & (S_ISUID \| S_ISGID)) && (ouid != uid \|\| ogid != gid)) {
if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID))		if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID))
node->tn_mode &= ~(S_ISUID \| S_ISGID);		atomic_store_int(&node->tn_mode, node->tn_mode & ~(S_ISUID \| S_ISGID));
}		}

ASSERT_VOP_ELOCKED(vp, "chown2");		ASSERT_VOP_ELOCKED(vp, "chown2");

return (0);		return (0);
}		}

/*		/*
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