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) /* Bind and unbind a cache from the filesystem backing it
^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/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/statfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static int cachefiles_daemon_add_cache(struct cachefiles_cache *caches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * bind a directory as a cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	_enter("{%u,%u,%u,%u,%u,%u},%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	       cache->frun_percent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	       cache->fcull_percent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	       cache->fstop_percent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	       cache->brun_percent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	       cache->bcull_percent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	       cache->bstop_percent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	       args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	/* start by checking things over */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	ASSERT(cache->fstop_percent >= 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	       cache->fstop_percent < cache->fcull_percent &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	       cache->fcull_percent < cache->frun_percent &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	       cache->frun_percent  < 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	ASSERT(cache->bstop_percent >= 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	       cache->bstop_percent < cache->bcull_percent &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	       cache->bcull_percent < cache->brun_percent &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	       cache->brun_percent  < 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (*args) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		pr_err("'bind' command doesn't take an argument\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	if (!cache->rootdirname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		pr_err("No cache directory specified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	/* don't permit already bound caches to be re-bound */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (test_bit(CACHEFILES_READY, &cache->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		pr_err("Cache already bound\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	/* make sure we have copies of the tag and dirname strings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (!cache->tag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		/* the tag string is released by the fops->release()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		 * function, so we don't release it on error here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		cache->tag = kstrdup("CacheFiles", GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		if (!cache->tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	/* add the cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	return cachefiles_daemon_add_cache(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * add a cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	struct cachefiles_object *fsdef;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	struct kstatfs stats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct dentry *graveyard, *cachedir, *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	const struct cred *saved_cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	_enter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	/* we want to work under the module's security ID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	ret = cachefiles_get_security_ID(cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	cachefiles_begin_secure(cache, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	/* allocate the root index object */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	fsdef = kmem_cache_alloc(cachefiles_object_jar, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (!fsdef)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		goto error_root_object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	ASSERTCMP(fsdef->backer, ==, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	atomic_set(&fsdef->usage, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	fsdef->type = FSCACHE_COOKIE_TYPE_INDEX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	_debug("- fsdef %p", fsdef);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	/* look up the directory at the root of the cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	ret = kern_path(cache->rootdirname, LOOKUP_DIRECTORY, &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		goto error_open_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	cache->mnt = path.mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	root = path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	/* check parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	ret = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (d_is_negative(root) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	    !d_backing_inode(root)->i_op->lookup ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	    !d_backing_inode(root)->i_op->mkdir ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	    !(d_backing_inode(root)->i_opflags & IOP_XATTR) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	    !root->d_sb->s_op->statfs ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	    !root->d_sb->s_op->sync_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	ret = -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (sb_rdonly(root->d_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	/* determine the security of the on-disk cache as this governs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 * security ID of files we create */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	ret = cachefiles_determine_cache_security(cache, root, &saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/* get the cache size and blocksize */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	ret = vfs_statfs(&path, &stats);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	ret = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (stats.f_bsize <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	ret = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (stats.f_bsize > PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	cache->bsize = stats.f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	cache->bshift = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	if (stats.f_bsize < PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		cache->bshift = PAGE_SHIFT - ilog2(stats.f_bsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	_debug("blksize %u (shift %u)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	       cache->bsize, cache->bshift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	_debug("size %llu, avail %llu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	       (unsigned long long) stats.f_blocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	       (unsigned long long) stats.f_bavail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	/* set up caching limits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	do_div(stats.f_files, 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	cache->fstop = stats.f_files * cache->fstop_percent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	cache->fcull = stats.f_files * cache->fcull_percent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	cache->frun  = stats.f_files * cache->frun_percent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	_debug("limits {%llu,%llu,%llu} files",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	       (unsigned long long) cache->frun,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	       (unsigned long long) cache->fcull,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	       (unsigned long long) cache->fstop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	stats.f_blocks >>= cache->bshift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	do_div(stats.f_blocks, 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	cache->bstop = stats.f_blocks * cache->bstop_percent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	cache->bcull = stats.f_blocks * cache->bcull_percent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	cache->brun  = stats.f_blocks * cache->brun_percent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	_debug("limits {%llu,%llu,%llu} blocks",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	       (unsigned long long) cache->brun,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	       (unsigned long long) cache->bcull,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	       (unsigned long long) cache->bstop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	/* get the cache directory and check its type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	cachedir = cachefiles_get_directory(cache, root, "cache");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (IS_ERR(cachedir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		ret = PTR_ERR(cachedir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	fsdef->dentry = cachedir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	fsdef->fscache.cookie = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	ret = cachefiles_check_object_type(fsdef);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	/* get the graveyard directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	graveyard = cachefiles_get_directory(cache, root, "graveyard");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (IS_ERR(graveyard)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		ret = PTR_ERR(graveyard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		goto error_unsupported;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	cache->graveyard = graveyard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	/* publish the cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	fscache_init_cache(&cache->cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 			   &cachefiles_cache_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			   "%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			   fsdef->dentry->d_sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	fscache_object_init(&fsdef->fscache, &fscache_fsdef_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			    &cache->cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	ret = fscache_add_cache(&cache->cache, &fsdef->fscache, cache->tag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		goto error_add_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	/* done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	set_bit(CACHEFILES_READY, &cache->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	dput(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	pr_info("File cache on %s registered\n", cache->cache.identifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	/* check how much space the cache has */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	cachefiles_has_space(cache, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) error_add_cache:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	dput(cache->graveyard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	cache->graveyard = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) error_unsupported:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	mntput(cache->mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	cache->mnt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	dput(fsdef->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	fsdef->dentry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	dput(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) error_open_root:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	kmem_cache_free(cachefiles_object_jar, fsdef);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) error_root_object:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	cachefiles_end_secure(cache, saved_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	pr_err("Failed to register: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)  * unbind a cache on fd release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	_enter("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (test_bit(CACHEFILES_READY, &cache->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		pr_info("File cache on %s unregistering\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			cache->cache.identifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		fscache_withdraw_cache(&cache->cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	dput(cache->graveyard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	mntput(cache->mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	kfree(cache->rootdirname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	kfree(cache->secctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	kfree(cache->tag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	_leave("");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }