Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* CacheFiles extended attribute management
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/fsnotify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/quotaops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) static const char cachefiles_xattr_cache[] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	XATTR_USER_PREFIX "CacheFiles.cache";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * check the type label on an object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * - done using xattrs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) int cachefiles_check_object_type(struct cachefiles_object *object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct dentry *dentry = object->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	char type[3], xtype[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	ASSERT(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	ASSERT(d_backing_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	if (!object->fscache.cookie)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		strcpy(type, "C3");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		snprintf(type, 3, "%02x", object->fscache.cookie->def->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	_enter("%p{%s}", object, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	/* attempt to install a type label directly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	ret = vfs_setxattr(dentry, cachefiles_xattr_cache, type, 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			   XATTR_CREATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if (ret == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		_debug("SET"); /* we succeeded */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (ret != -EEXIST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		pr_err("Can't set xattr on %pd [%lu] (err %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		       dentry, d_backing_inode(dentry)->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		       -ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	/* read the current type label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	ret = vfs_getxattr(dentry, cachefiles_xattr_cache, xtype, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		if (ret == -ERANGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			goto bad_type_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		pr_err("Can't read xattr on %pd [%lu] (err %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		       dentry, d_backing_inode(dentry)->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		       -ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	/* check the type is what we're expecting */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	if (ret != 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		goto bad_type_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (xtype[0] != type[0] || xtype[1] != type[1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		goto bad_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) bad_type_length:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	pr_err("Cache object %lu type xattr length incorrect\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	       d_backing_inode(dentry)->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) bad_type:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	xtype[2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	pr_err("Cache object %pd [%lu] type %s not %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	       dentry, d_backing_inode(dentry)->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	       xtype, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  * set the state xattr on a cache file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) int cachefiles_set_object_xattr(struct cachefiles_object *object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 				struct cachefiles_xattr *auxdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct dentry *dentry = object->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	ASSERT(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	_enter("%p,#%d", object, auxdata->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	/* attempt to install the cache metadata directly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	_debug("SET #%u", auxdata->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	ret = vfs_setxattr(dentry, cachefiles_xattr_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			   &auxdata->type, auxdata->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			   XATTR_CREATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (ret < 0 && ret != -ENOMEM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		cachefiles_io_error_obj(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			"Failed to set xattr with error %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  * update the state xattr on a cache file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int cachefiles_update_object_xattr(struct cachefiles_object *object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 				   struct cachefiles_xattr *auxdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct dentry *dentry = object->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (!dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	_enter("%p,#%d", object, auxdata->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	/* attempt to install the cache metadata directly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	_debug("SET #%u", auxdata->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	ret = vfs_setxattr(dentry, cachefiles_xattr_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			   &auxdata->type, auxdata->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			   XATTR_REPLACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (ret < 0 && ret != -ENOMEM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		cachefiles_io_error_obj(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			"Failed to update xattr with error %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  * check the consistency between the backing cache and the FS-Cache cookie
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int cachefiles_check_auxdata(struct cachefiles_object *object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	struct cachefiles_xattr *auxbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	enum fscache_checkaux validity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	struct dentry *dentry = object->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	ssize_t xlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	ASSERT(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	ASSERT(d_backing_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	ASSERT(object->fscache.cookie->def->check_aux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	auxbuf = kmalloc(sizeof(struct cachefiles_xattr) + 512, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (!auxbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	xlen = vfs_getxattr(dentry, cachefiles_xattr_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			    &auxbuf->type, 512 + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	ret = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (xlen < 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	    auxbuf->type != object->fscache.cookie->def->type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	xlen--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	validity = fscache_check_aux(&object->fscache, &auxbuf->data, xlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 				     i_size_read(d_backing_inode(dentry)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (validity != FSCACHE_CHECKAUX_OKAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	kfree(auxbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  * check the state xattr on a cache file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  * - return -ESTALE if the object should be deleted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int cachefiles_check_object_xattr(struct cachefiles_object *object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 				  struct cachefiles_xattr *auxdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct cachefiles_xattr *auxbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct dentry *dentry = object->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	_enter("%p,#%d", object, auxdata->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	ASSERT(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	ASSERT(d_backing_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	auxbuf = kmalloc(sizeof(struct cachefiles_xattr) + 512, cachefiles_gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (!auxbuf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		_leave(" = -ENOMEM");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	/* read the current type label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	ret = vfs_getxattr(dentry, cachefiles_xattr_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			   &auxbuf->type, 512 + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		if (ret == -ENODATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			goto stale; /* no attribute - power went off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 				     * mid-cull? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		if (ret == -ERANGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			goto bad_type_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		cachefiles_io_error_obj(object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 					"Can't read xattr on %lu (err %d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 					d_backing_inode(dentry)->i_ino, -ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	/* check the on-disk object */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (ret < 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		goto bad_type_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (auxbuf->type != auxdata->type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		goto stale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	auxbuf->len = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	/* consult the netfs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (object->fscache.cookie->def->check_aux) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		enum fscache_checkaux result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		unsigned int dlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		dlen = auxbuf->len - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		_debug("checkaux %s #%u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		       object->fscache.cookie->def->name, dlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		result = fscache_check_aux(&object->fscache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 					   &auxbuf->data, dlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 					   i_size_read(d_backing_inode(dentry)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		switch (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			/* entry okay as is */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		case FSCACHE_CHECKAUX_OKAY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			goto okay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			/* entry requires update */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		case FSCACHE_CHECKAUX_NEEDS_UPDATE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			/* entry requires deletion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		case FSCACHE_CHECKAUX_OBSOLETE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			goto stale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		/* update the current label */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		ret = vfs_setxattr(dentry, cachefiles_xattr_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 				   &auxdata->type, auxdata->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 				   XATTR_REPLACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			cachefiles_io_error_obj(object,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 						"Can't update xattr on %lu"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 						" (error %d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 						d_backing_inode(dentry)->i_ino, -ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) okay:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	kfree(auxbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) bad_type_length:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	pr_err("Cache object %lu xattr length incorrect\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	       d_backing_inode(dentry)->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) stale:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	ret = -ESTALE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)  * remove the object's xattr to mark it stale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 				   struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	ret = vfs_removexattr(dentry, cachefiles_xattr_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		if (ret == -ENOENT || ret == -ENODATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 			ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		else if (ret != -ENOMEM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			cachefiles_io_error(cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 					    "Can't remove xattr from %lu"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 					    " (error %d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 					    d_backing_inode(dentry)->i_ino, -ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	_leave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }