/*
- * Copyright (c) 2004-2008 Apple Inc. All rights reserved.
+ * Copyright (c) 2004-2010 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#define MAKE_SHADOW_NAME(VP, NAME) \
snprintf((NAME), sizeof((NAME)), ".vfs_rsrc_stream_%p%08x%p", (void*)(VP), (VP)->v_id, (VP)->v_data);
-static vnode_t shadow_dvp; /* tmp directory to hold stream shadow files */
-static int shadow_vid;
static int shadow_sequence;
return (0);
}
datasize = va.va_data_size;
- if ((datasize == 0)) {
+ if (datasize == 0) {
(void) default_removexattr(vp, XATTR_RESOURCEFORK_NAME, 0, context);
return (0);
}
char tmpname[80];
size_t datasize = 0;
int error = 0;
+ int retries = 0;
+retry_create:
*creator = 0;
-
/* Establish a unique file name. */
MAKE_SHADOW_NAME(vp, tmpname);
bzero(&cn, sizeof(cn));
if (error == 0) {
vnode_recycle(svp);
*creator = 1;
- } else if ((error == EEXIST) && !makestream) {
+ }
+ else if ((error == EEXIST) && !makestream) {
error = VNOP_LOOKUP(dvp, &svp, &cn, context);
}
+ else if ((error == ENOENT) && !makestream) {
+ /*
+ * We could have raced with a rmdir on the shadow directory
+ * post-lookup. Retry from the beginning, 1x only, to
+ * try and see if we need to re-create the shadow directory
+ * in get_shadow_dir.
+ */
+ if (retries == 0) {
+ retries++;
+ if (dvp) {
+ vnode_put (dvp);
+ dvp = NULLVP;
+ }
+ if (svp) {
+ vnode_put (svp);
+ svp = NULLVP;
+ }
+ goto retry_create;
+ }
+ /* Otherwise, just error out normally below */
+ }
+
out:
if (dvp) {
vnode_put(dvp);
uint32_t tmp_fsid;
int error;
- /* Check if we've already created it. */
- if (shadow_dvp != NULLVP) {
- if ((error = vnode_getwithvid(shadow_dvp, shadow_vid))) {
- shadow_dvp = NULLVP;
- } else {
- *sdvpp = shadow_dvp;
- return (0);
- }
+
+ bzero(tmpname, sizeof(tmpname));
+ snprintf(tmpname, sizeof(tmpname), "/var/run/.vfs_rsrc_streams_%p%x",
+ (void*)rootvnode, shadow_sequence);
+ /*
+ * Look up the shadow directory to ensure that it still exists.
+ * By looking it up, we get an iocounted dvp to use, and avoid some coherency issues
+ * in caching it when multiple threads may be trying to manipulate the pointers.
+ */
+ error = vnode_lookup(tmpname, 0, &sdvp, context);
+ if (error == 0) {
+ /*
+ * If we get here, then we have successfully looked up the shadow dir,
+ * and it has an iocount from the lookup. Return the vp in the output argument.
+ */
+ *sdvpp = sdvp;
+ return (0);
}
+ /* In the failure case, no iocount is acquired */
+ sdvp = NULLVP;
+ bzero (tmpname, sizeof(tmpname));
- /* Obtain the vnode for "/tmp" directory. */
- if (vnode_lookup("/tmp", 0, &dvp, context) != 0) {
+ /* Obtain the vnode for "/var/run" directory. */
+ if (vnode_lookup("/var/run", 0, &dvp, context) != 0) {
error = ENOTSUP;
goto out;
}
/*
* There can be only one winner for an exclusive create.
*/
- if (error == 0) {
- /* Take a long term ref to keep this dir around. */
- error = vnode_ref(sdvp);
- if (error == 0) {
- shadow_dvp = sdvp;
- shadow_vid = sdvp->v_id;
- }
- } else if (error == EEXIST) {
+ if (error == EEXIST) {
/* loser has to look up directory */
error = VNOP_LOOKUP(dvp, &sdvp, &cn, context);
if (error == 0) {
#define ATTR_BUF_SIZE 4096 /* default size of the attr file and how much we'll grow by */
/* Implementation Limits */
-#define ATTR_MAX_SIZE (128*1024) /* 128K maximum attribute data size */
+#define ATTR_MAX_SIZE AD_XATTR_MAXSIZE
#define ATTR_MAX_HDR_SIZE 65536
/*
* Note: ATTR_MAX_HDR_SIZE is the largest attribute header
* file security from the EA must always get access
*/
lookup:
- NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW | USEDVP | DONOTAUTH, UIO_SYSSPACE,
- CAST_USER_ADDR_T(filename), context);
+ NDINIT(&nd, LOOKUP, OP_OPEN, LOCKLEAF | NOFOLLOW | USEDVP | DONOTAUTH,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(filename), context);
nd.ni_dvp = dvp;
if (fileflags & O_CREAT) {
nd.ni_cnd.cn_nameiop = CREATE;
+#if CONFIG_TRIGGERS
+ nd.ni_op = OP_LINK;
+#endif
if (dvp != vp) {
nd.ni_cnd.cn_flags |= LOCKPARENT;
}
if (gid != KAUTH_GID_NONE)
VATTR_SET(&va, va_gid, gid);
- error = vn_create(dvp, &nd.ni_vp, &nd.ni_cnd, &va,
+ error = vn_create(dvp, &nd.ni_vp, &nd, &va,
VN_CREATE_NOAUTH | VN_CREATE_NOINHERIT | VN_CREATE_NOLABEL,
+ 0, NULL,
context);
if (error)
error = ENOATTR;
return (error);
}
- NDINIT(&nd, DELETE, LOCKPARENT | NOFOLLOW | DONOTAUTH,
+ NDINIT(&nd, DELETE, OP_UNLINK, LOCKPARENT | NOFOLLOW | DONOTAUTH,
UIO_SYSSPACE, CAST_USER_ADDR_T(path), context);
error = namei(&nd);
FREE_ZONE(path, MAXPATHLEN, M_NAMEI);
projects / apple / xnu.git / blobdiff