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Code Issues Releases Activity

MFp4: Make use of the kernel unit number allocation facility

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for tmpfs nodes.

Submitted by:	Mingyan Guo <guomingyan gmail com>
Approved by:	re (tmpfs blanket)
This commit is contained in:
Xin LI 2007-07-11 14:26:27 +00:00
parent 1e3703993b
commit 8d9a89a3a0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=171362
3 changed files with 10 additions and 18 deletions
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6
sys/fs/tmpfs/tmpfs.h
View File

@ -288,10 +288,8 @@ struct tmpfs_mount {
* of empty files and then simply removing them. */
ino_t tm_nodes_max;
/* Number of nodes currently allocated. This number only grows.
* When it reaches tm_nodes_max, no more new nodes can be allocated.
* Of course, the old, unused ones can be reused. */
ino_t tm_nodes_last;
/* unrhdr used to allocate inode numbers */
struct unrhdr * tm_ino_unr;
/* Number of nodes currently that are in use. */
ino_t tm_nodes_inuse;

2
sys/fs/tmpfs/tmpfs_subr.c
View File

@ -114,6 +114,7 @@ tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type,
nnode->tn_uid = uid;
nnode->tn_gid = gid;
nnode->tn_mode = mode;
nnode->tn_id = alloc_unr(tmp->tm_ino_unr);
/* Type-specific initialization. */
switch (nnode->tn_type) {
@ -225,6 +226,7 @@ tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node)
break;
}
free_unr(tmp->tm_ino_unr, node->tn_id);
uma_zfree(tmp->tm_node_pool, node);
TMPFS_LOCK(tmp);

20
sys/fs/tmpfs/tmpfs_vfsops.c
View File

@ -146,19 +146,7 @@ tmpfs_node_ctor(void *mem, int size, void *arg, int flags)
{
struct tmpfs_node *node = (struct tmpfs_node *)mem;
if (node->tn_id == 0) {
/* if this node structure first time used */
struct tmpfs_mount *tmp = (struct tmpfs_mount *)arg;
TMPFS_LOCK(tmp);
node->tn_id = tmp->tm_nodes_last++;
TMPFS_UNLOCK(tmp);
if (node->tn_id == INT_MAX)
panic("all avariable id is used.");
node->tn_gen = arc4random();
} else {
node->tn_gen++;
}
node->tn_gen++;
node->tn_size = 0;
node->tn_status = 0;
node->tn_flags = 0;
@ -185,6 +173,7 @@ tmpfs_node_init(void *mem, int size, int flags)
node->tn_id = 0;
mtx_init(&node->tn_interlock, "tmpfs node interlock", NULL, MTX_DEF);
node->tn_gen = arc4random();
return (0);
}
@ -278,13 +267,13 @@ tmpfs_mount(struct mount *mp, struct thread *td)
mtx_init(&tmp->allnode_lock, "tmpfs allnode lock", NULL, MTX_DEF);
tmp->tm_nodes_max = nodes;
tmp->tm_nodes_last = 2;
tmp->tm_nodes_inuse = 0;
tmp->tm_maxfilesize = get_swpgtotal() * PAGE_SIZE;
LIST_INIT(&tmp->tm_nodes_used);
tmp->tm_pages_max = pages;
tmp->tm_pages_used = 0;
tmp->tm_ino_unr = new_unrhdr(2, INT_MAX, &tmp->allnode_lock);
tmp->tm_dirent_pool = uma_zcreate(
"TMPFS dirent",
sizeof(struct tmpfs_dirent),
@ -307,9 +296,11 @@ tmpfs_mount(struct mount *mp, struct thread *td)
if (error != 0 || root == NULL) {
uma_zdestroy(tmp->tm_node_pool);
uma_zdestroy(tmp->tm_dirent_pool);
delete_unrhdr(tmp->tm_ino_unr);
free(tmp, M_TMPFSMNT);
return error;
}
KASSERT(root->tn_id == 2, ("tmpfs root with invalid ino: %d", root->tn_id));
tmp->tm_root = root;
MNT_ILOCK(mp);
@ -377,6 +368,7 @@ tmpfs_unmount(struct mount *mp, int mntflags, struct thread *l)
uma_zdestroy(tmp->tm_dirent_pool);
uma_zdestroy(tmp->tm_node_pool);
delete_unrhdr(tmp->tm_ino_unr);
mtx_destroy(&tmp->allnode_lock);
MPASS(tmp->tm_pages_used == 0);