source "fs/netfs/Kconfig"
source "fs/fscache/Kconfig"
-source "fs/cachefiles/Kconfig"
endmenu
obj-$(CONFIG_NILFS2_FS) += nilfs2/
obj-$(CONFIG_BEFS_FS) += befs/
obj-$(CONFIG_HOSTFS) += hostfs/
-obj-$(CONFIG_CACHEFILES) += cachefiles/
obj-$(CONFIG_DEBUG_FS) += debugfs/
obj-$(CONFIG_TRACING) += tracefs/
obj-$(CONFIG_OCFS2_FS) += ocfs2/
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0-only
-
-config CACHEFILES
- tristate "Filesystem caching on files"
- depends on FSCACHE && BLOCK
- help
- This permits use of a mounted filesystem as a cache for other
- filesystems - primarily networking filesystems - thus allowing fast
- local disk to enhance the speed of slower devices.
-
- See Documentation/filesystems/caching/cachefiles.rst for more
- information.
-
-config CACHEFILES_DEBUG
- bool "Debug CacheFiles"
- depends on CACHEFILES
- help
- This permits debugging to be dynamically enabled in the filesystem
- caching on files module. If this is set, the debugging output may be
- enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
- by including a debugging specifier in /etc/cachefilesd.conf.
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for caching in a mounted filesystem
-#
-
-cachefiles-y := \
- bind.o \
- daemon.o \
- main.o \
- security.o
-
-obj-$(CONFIG_CACHEFILES) := cachefiles.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Bind and unbind a cache from the filesystem backing it
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/namei.h>
-#include <linux/mount.h>
-#include <linux/statfs.h>
-#include <linux/ctype.h>
-#include <linux/xattr.h>
-#include "internal.h"
-
-static int cachefiles_daemon_add_cache(struct cachefiles_cache *caches);
-
-/*
- * bind a directory as a cache
- */
-int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
-{
- _enter("{%u,%u,%u,%u,%u,%u},%s",
- cache->frun_percent,
- cache->fcull_percent,
- cache->fstop_percent,
- cache->brun_percent,
- cache->bcull_percent,
- cache->bstop_percent,
- args);
-
- /* start by checking things over */
- ASSERT(cache->fstop_percent < cache->fcull_percent &&
- cache->fcull_percent < cache->frun_percent &&
- cache->frun_percent < 100);
-
- ASSERT(cache->bstop_percent < cache->bcull_percent &&
- cache->bcull_percent < cache->brun_percent &&
- cache->brun_percent < 100);
-
- if (*args) {
- pr_err("'bind' command doesn't take an argument\n");
- return -EINVAL;
- }
-
- if (!cache->rootdirname) {
- pr_err("No cache directory specified\n");
- return -EINVAL;
- }
-
- /* don't permit already bound caches to be re-bound */
- if (test_bit(CACHEFILES_READY, &cache->flags)) {
- pr_err("Cache already bound\n");
- return -EBUSY;
- }
-
- /* make sure we have copies of the tag and dirname strings */
- if (!cache->tag) {
- /* the tag string is released by the fops->release()
- * function, so we don't release it on error here */
- cache->tag = kstrdup("CacheFiles", GFP_KERNEL);
- if (!cache->tag)
- return -ENOMEM;
- }
-
- /* add the cache */
- return cachefiles_daemon_add_cache(cache);
-}
-
-/*
- * add a cache
- */
-static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
-{
- struct path path;
- struct kstatfs stats;
- struct dentry *root;
- const struct cred *saved_cred;
- int ret;
-
- _enter("");
-
- /* we want to work under the module's security ID */
- ret = cachefiles_get_security_ID(cache);
- if (ret < 0)
- return ret;
-
- cachefiles_begin_secure(cache, &saved_cred);
-
- /* look up the directory at the root of the cache */
- ret = kern_path(cache->rootdirname, LOOKUP_DIRECTORY, &path);
- if (ret < 0)
- goto error_open_root;
-
- cache->mnt = path.mnt;
- root = path.dentry;
-
- ret = -EINVAL;
- if (mnt_user_ns(path.mnt) != &init_user_ns) {
- pr_warn("File cache on idmapped mounts not supported");
- goto error_unsupported;
- }
-
- /* check parameters */
- ret = -EOPNOTSUPP;
- if (d_is_negative(root) ||
- !d_backing_inode(root)->i_op->lookup ||
- !d_backing_inode(root)->i_op->mkdir ||
- !(d_backing_inode(root)->i_opflags & IOP_XATTR) ||
- !root->d_sb->s_op->statfs ||
- !root->d_sb->s_op->sync_fs)
- goto error_unsupported;
-
- ret = -EROFS;
- if (sb_rdonly(root->d_sb))
- goto error_unsupported;
-
- /* determine the security of the on-disk cache as this governs
- * security ID of files we create */
- ret = cachefiles_determine_cache_security(cache, root, &saved_cred);
- if (ret < 0)
- goto error_unsupported;
-
- /* get the cache size and blocksize */
- ret = vfs_statfs(&path, &stats);
- if (ret < 0)
- goto error_unsupported;
-
- ret = -ERANGE;
- if (stats.f_bsize <= 0)
- goto error_unsupported;
-
- ret = -EOPNOTSUPP;
- if (stats.f_bsize > PAGE_SIZE)
- goto error_unsupported;
-
- cache->bsize = stats.f_bsize;
- cache->bshift = 0;
- if (stats.f_bsize < PAGE_SIZE)
- cache->bshift = PAGE_SHIFT - ilog2(stats.f_bsize);
-
- _debug("blksize %u (shift %u)",
- cache->bsize, cache->bshift);
-
- _debug("size %llu, avail %llu",
- (unsigned long long) stats.f_blocks,
- (unsigned long long) stats.f_bavail);
-
- /* set up caching limits */
- do_div(stats.f_files, 100);
- cache->fstop = stats.f_files * cache->fstop_percent;
- cache->fcull = stats.f_files * cache->fcull_percent;
- cache->frun = stats.f_files * cache->frun_percent;
-
- _debug("limits {%llu,%llu,%llu} files",
- (unsigned long long) cache->frun,
- (unsigned long long) cache->fcull,
- (unsigned long long) cache->fstop);
-
- stats.f_blocks >>= cache->bshift;
- do_div(stats.f_blocks, 100);
- cache->bstop = stats.f_blocks * cache->bstop_percent;
- cache->bcull = stats.f_blocks * cache->bcull_percent;
- cache->brun = stats.f_blocks * cache->brun_percent;
-
- _debug("limits {%llu,%llu,%llu} blocks",
- (unsigned long long) cache->brun,
- (unsigned long long) cache->bcull,
- (unsigned long long) cache->bstop);
-
- // PLACEHOLDER: Register with fscache
- ret = -ENOANO;
- goto error_unsupported;
-
-error_unsupported:
- mntput(cache->mnt);
- cache->mnt = NULL;
- dput(root);
-error_open_root:
- cachefiles_end_secure(cache, saved_cred);
- pr_err("Failed to register: %d\n", ret);
- return ret;
-}
-
-/*
- * unbind a cache on fd release
- */
-void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
-{
- _enter("");
-
- if (test_bit(CACHEFILES_READY, &cache->flags)) {
- // PLACEHOLDER: Withdraw cache
- }
-
- mntput(cache->mnt);
-
- kfree(cache->rootdirname);
- kfree(cache->secctx);
- kfree(cache->tag);
-
- _leave("");
-}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Daemon interface
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/namei.h>
-#include <linux/poll.h>
-#include <linux/mount.h>
-#include <linux/statfs.h>
-#include <linux/ctype.h>
-#include <linux/string.h>
-#include <linux/fs_struct.h>
-#include "internal.h"
-
-static int cachefiles_daemon_open(struct inode *, struct file *);
-static int cachefiles_daemon_release(struct inode *, struct file *);
-static ssize_t cachefiles_daemon_read(struct file *, char __user *, size_t,
- loff_t *);
-static ssize_t cachefiles_daemon_write(struct file *, const char __user *,
- size_t, loff_t *);
-static __poll_t cachefiles_daemon_poll(struct file *,
- struct poll_table_struct *);
-static int cachefiles_daemon_frun(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_fcull(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_fstop(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_brun(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_bcull(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_bstop(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_cull(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_debug(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_dir(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_inuse(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_secctx(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_tag(struct cachefiles_cache *, char *);
-
-static unsigned long cachefiles_open;
-
-const struct file_operations cachefiles_daemon_fops = {
- .owner = THIS_MODULE,
- .open = cachefiles_daemon_open,
- .release = cachefiles_daemon_release,
- .read = cachefiles_daemon_read,
- .write = cachefiles_daemon_write,
- .poll = cachefiles_daemon_poll,
- .llseek = noop_llseek,
-};
-
-struct cachefiles_daemon_cmd {
- char name[8];
- int (*handler)(struct cachefiles_cache *cache, char *args);
-};
-
-static const struct cachefiles_daemon_cmd cachefiles_daemon_cmds[] = {
- { "bind", cachefiles_daemon_bind },
- { "brun", cachefiles_daemon_brun },
- { "bcull", cachefiles_daemon_bcull },
- { "bstop", cachefiles_daemon_bstop },
- { "cull", cachefiles_daemon_cull },
- { "debug", cachefiles_daemon_debug },
- { "dir", cachefiles_daemon_dir },
- { "frun", cachefiles_daemon_frun },
- { "fcull", cachefiles_daemon_fcull },
- { "fstop", cachefiles_daemon_fstop },
- { "inuse", cachefiles_daemon_inuse },
- { "secctx", cachefiles_daemon_secctx },
- { "tag", cachefiles_daemon_tag },
- { "", NULL }
-};
-
-
-/*
- * do various checks
- */
-static int cachefiles_daemon_open(struct inode *inode, struct file *file)
-{
- struct cachefiles_cache *cache;
-
- _enter("");
-
- /* only the superuser may do this */
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- /* the cachefiles device may only be open once at a time */
- if (xchg(&cachefiles_open, 1) == 1)
- return -EBUSY;
-
- /* allocate a cache record */
- cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL);
- if (!cache) {
- cachefiles_open = 0;
- return -ENOMEM;
- }
-
- mutex_init(&cache->daemon_mutex);
- init_waitqueue_head(&cache->daemon_pollwq);
-
- /* set default caching limits
- * - limit at 1% free space and/or free files
- * - cull below 5% free space and/or free files
- * - cease culling above 7% free space and/or free files
- */
- cache->frun_percent = 7;
- cache->fcull_percent = 5;
- cache->fstop_percent = 1;
- cache->brun_percent = 7;
- cache->bcull_percent = 5;
- cache->bstop_percent = 1;
-
- file->private_data = cache;
- cache->cachefilesd = file;
- return 0;
-}
-
-/*
- * release a cache
- */
-static int cachefiles_daemon_release(struct inode *inode, struct file *file)
-{
- struct cachefiles_cache *cache = file->private_data;
-
- _enter("");
-
- ASSERT(cache);
-
- set_bit(CACHEFILES_DEAD, &cache->flags);
-
- cachefiles_daemon_unbind(cache);
-
- /* clean up the control file interface */
- cache->cachefilesd = NULL;
- file->private_data = NULL;
- cachefiles_open = 0;
-
- kfree(cache);
-
- _leave("");
- return 0;
-}
-
-/*
- * read the cache state
- */
-static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer,
- size_t buflen, loff_t *pos)
-{
- struct cachefiles_cache *cache = file->private_data;
- unsigned long long b_released;
- unsigned f_released;
- char buffer[256];
- int n;
-
- //_enter(",,%zu,", buflen);
-
- if (!test_bit(CACHEFILES_READY, &cache->flags))
- return 0;
-
- /* check how much space the cache has */
- // PLACEHOLDER: Check space
-
- /* summarise */
- f_released = atomic_xchg(&cache->f_released, 0);
- b_released = atomic_long_xchg(&cache->b_released, 0);
- clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
-
- n = snprintf(buffer, sizeof(buffer),
- "cull=%c"
- " frun=%llx"
- " fcull=%llx"
- " fstop=%llx"
- " brun=%llx"
- " bcull=%llx"
- " bstop=%llx"
- " freleased=%x"
- " breleased=%llx",
- test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0',
- (unsigned long long) cache->frun,
- (unsigned long long) cache->fcull,
- (unsigned long long) cache->fstop,
- (unsigned long long) cache->brun,
- (unsigned long long) cache->bcull,
- (unsigned long long) cache->bstop,
- f_released,
- b_released);
-
- if (n > buflen)
- return -EMSGSIZE;
-
- if (copy_to_user(_buffer, buffer, n) != 0)
- return -EFAULT;
-
- return n;
-}
-
-/*
- * command the cache
- */
-static ssize_t cachefiles_daemon_write(struct file *file,
- const char __user *_data,
- size_t datalen,
- loff_t *pos)
-{
- const struct cachefiles_daemon_cmd *cmd;
- struct cachefiles_cache *cache = file->private_data;
- ssize_t ret;
- char *data, *args, *cp;
-
- //_enter(",,%zu,", datalen);
-
- ASSERT(cache);
-
- if (test_bit(CACHEFILES_DEAD, &cache->flags))
- return -EIO;
-
- if (datalen > PAGE_SIZE - 1)
- return -EOPNOTSUPP;
-
- /* drag the command string into the kernel so we can parse it */
- data = memdup_user_nul(_data, datalen);
- if (IS_ERR(data))
- return PTR_ERR(data);
-
- ret = -EINVAL;
- if (memchr(data, '\0', datalen))
- goto error;
-
- /* strip any newline */
- cp = memchr(data, '\n', datalen);
- if (cp) {
- if (cp == data)
- goto error;
-
- *cp = '\0';
- }
-
- /* parse the command */
- ret = -EOPNOTSUPP;
-
- for (args = data; *args; args++)
- if (isspace(*args))
- break;
- if (*args) {
- if (args == data)
- goto error;
- *args = '\0';
- args = skip_spaces(++args);
- }
-
- /* run the appropriate command handler */
- for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++)
- if (strcmp(cmd->name, data) == 0)
- goto found_command;
-
-error:
- kfree(data);
- //_leave(" = %zd", ret);
- return ret;
-
-found_command:
- mutex_lock(&cache->daemon_mutex);
-
- ret = -EIO;
- if (!test_bit(CACHEFILES_DEAD, &cache->flags))
- ret = cmd->handler(cache, args);
-
- mutex_unlock(&cache->daemon_mutex);
-
- if (ret == 0)
- ret = datalen;
- goto error;
-}
-
-/*
- * poll for culling state
- * - use EPOLLOUT to indicate culling state
- */
-static __poll_t cachefiles_daemon_poll(struct file *file,
- struct poll_table_struct *poll)
-{
- struct cachefiles_cache *cache = file->private_data;
- __poll_t mask;
-
- poll_wait(file, &cache->daemon_pollwq, poll);
- mask = 0;
-
- if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags))
- mask |= EPOLLIN;
-
- if (test_bit(CACHEFILES_CULLING, &cache->flags))
- mask |= EPOLLOUT;
-
- return mask;
-}
-
-/*
- * give a range error for cache space constraints
- * - can be tail-called
- */
-static int cachefiles_daemon_range_error(struct cachefiles_cache *cache,
- char *args)
-{
- pr_err("Free space limits must be in range 0%%<=stop<cull<run<100%%\n");
-
- return -EINVAL;
-}
-
-/*
- * set the percentage of files at which to stop culling
- * - command: "frun <N>%"
- */
-static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args)
-{
- unsigned long frun;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- frun = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (frun <= cache->fcull_percent || frun >= 100)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->frun_percent = frun;
- return 0;
-}
-
-/*
- * set the percentage of files at which to start culling
- * - command: "fcull <N>%"
- */
-static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args)
-{
- unsigned long fcull;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- fcull = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->fcull_percent = fcull;
- return 0;
-}
-
-/*
- * set the percentage of files at which to stop allocating
- * - command: "fstop <N>%"
- */
-static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)
-{
- unsigned long fstop;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- fstop = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (fstop >= cache->fcull_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->fstop_percent = fstop;
- return 0;
-}
-
-/*
- * set the percentage of blocks at which to stop culling
- * - command: "brun <N>%"
- */
-static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args)
-{
- unsigned long brun;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- brun = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (brun <= cache->bcull_percent || brun >= 100)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->brun_percent = brun;
- return 0;
-}
-
-/*
- * set the percentage of blocks at which to start culling
- * - command: "bcull <N>%"
- */
-static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args)
-{
- unsigned long bcull;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- bcull = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->bcull_percent = bcull;
- return 0;
-}
-
-/*
- * set the percentage of blocks at which to stop allocating
- * - command: "bstop <N>%"
- */
-static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)
-{
- unsigned long bstop;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- bstop = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (bstop >= cache->bcull_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->bstop_percent = bstop;
- return 0;
-}
-
-/*
- * set the cache directory
- * - command: "dir <name>"
- */
-static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)
-{
- char *dir;
-
- _enter(",%s", args);
-
- if (!*args) {
- pr_err("Empty directory specified\n");
- return -EINVAL;
- }
-
- if (cache->rootdirname) {
- pr_err("Second cache directory specified\n");
- return -EEXIST;
- }
-
- dir = kstrdup(args, GFP_KERNEL);
- if (!dir)
- return -ENOMEM;
-
- cache->rootdirname = dir;
- return 0;
-}
-
-/*
- * set the cache security context
- * - command: "secctx <ctx>"
- */
-static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)
-{
- char *secctx;
-
- _enter(",%s", args);
-
- if (!*args) {
- pr_err("Empty security context specified\n");
- return -EINVAL;
- }
-
- if (cache->secctx) {
- pr_err("Second security context specified\n");
- return -EINVAL;
- }
-
- secctx = kstrdup(args, GFP_KERNEL);
- if (!secctx)
- return -ENOMEM;
-
- cache->secctx = secctx;
- return 0;
-}
-
-/*
- * set the cache tag
- * - command: "tag <name>"
- */
-static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)
-{
- char *tag;
-
- _enter(",%s", args);
-
- if (!*args) {
- pr_err("Empty tag specified\n");
- return -EINVAL;
- }
-
- if (cache->tag)
- return -EEXIST;
-
- tag = kstrdup(args, GFP_KERNEL);
- if (!tag)
- return -ENOMEM;
-
- cache->tag = tag;
- return 0;
-}
-
-/*
- * request a node in the cache be culled from the current working directory
- * - command: "cull <name>"
- */
-static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
-{
- struct path path;
- const struct cred *saved_cred;
- int ret;
-
- _enter(",%s", args);
-
- if (strchr(args, '/'))
- goto inval;
-
- if (!test_bit(CACHEFILES_READY, &cache->flags)) {
- pr_err("cull applied to unready cache\n");
- return -EIO;
- }
-
- if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
- pr_err("cull applied to dead cache\n");
- return -EIO;
- }
-
- /* extract the directory dentry from the cwd */
- get_fs_pwd(current->fs, &path);
-
- if (!d_can_lookup(path.dentry))
- goto notdir;
-
- cachefiles_begin_secure(cache, &saved_cred);
- ret = -ENOANO; // PLACEHOLDER: Do culling
- cachefiles_end_secure(cache, saved_cred);
-
- path_put(&path);
- _leave(" = %d", ret);
- return ret;
-
-notdir:
- path_put(&path);
- pr_err("cull command requires dirfd to be a directory\n");
- return -ENOTDIR;
-
-inval:
- pr_err("cull command requires dirfd and filename\n");
- return -EINVAL;
-}
-
-/*
- * set debugging mode
- * - command: "debug <mask>"
- */
-static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)
-{
- unsigned long mask;
-
- _enter(",%s", args);
-
- mask = simple_strtoul(args, &args, 0);
- if (args[0] != '\0')
- goto inval;
-
- cachefiles_debug = mask;
- _leave(" = 0");
- return 0;
-
-inval:
- pr_err("debug command requires mask\n");
- return -EINVAL;
-}
-
-/*
- * find out whether an object in the current working directory is in use or not
- * - command: "inuse <name>"
- */
-static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
-{
- struct path path;
- const struct cred *saved_cred;
- int ret;
-
- //_enter(",%s", args);
-
- if (strchr(args, '/'))
- goto inval;
-
- if (!test_bit(CACHEFILES_READY, &cache->flags)) {
- pr_err("inuse applied to unready cache\n");
- return -EIO;
- }
-
- if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
- pr_err("inuse applied to dead cache\n");
- return -EIO;
- }
-
- /* extract the directory dentry from the cwd */
- get_fs_pwd(current->fs, &path);
-
- if (!d_can_lookup(path.dentry))
- goto notdir;
-
- cachefiles_begin_secure(cache, &saved_cred);
- ret = -ENOANO; // PLACEHOLDER: Check if in use
- cachefiles_end_secure(cache, saved_cred);
-
- path_put(&path);
- //_leave(" = %d", ret);
- return ret;
-
-notdir:
- path_put(&path);
- pr_err("inuse command requires dirfd to be a directory\n");
- return -ENOTDIR;
-
-inval:
- pr_err("inuse command requires dirfd and filename\n");
- return -EINVAL;
-}
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* General netfs cache on cache files internal defs
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#ifdef pr_fmt
-#undef pr_fmt
-#endif
-
-#define pr_fmt(fmt) "CacheFiles: " fmt
-
-
-#include <linux/fscache-cache.h>
-#include <linux/timer.h>
-#include <linux/wait_bit.h>
-#include <linux/cred.h>
-#include <linux/workqueue.h>
-#include <linux/security.h>
-
-struct cachefiles_cache;
-struct cachefiles_object;
-
-extern unsigned cachefiles_debug;
-#define CACHEFILES_DEBUG_KENTER 1
-#define CACHEFILES_DEBUG_KLEAVE 2
-#define CACHEFILES_DEBUG_KDEBUG 4
-
-/*
- * Cache files cache definition
- */
-struct cachefiles_cache {
- struct vfsmount *mnt; /* mountpoint holding the cache */
- struct file *cachefilesd; /* manager daemon handle */
- const struct cred *cache_cred; /* security override for accessing cache */
- struct mutex daemon_mutex; /* command serialisation mutex */
- wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
- atomic_t gravecounter; /* graveyard uniquifier */
- atomic_t f_released; /* number of objects released lately */
- atomic_long_t b_released; /* number of blocks released lately */
- unsigned frun_percent; /* when to stop culling (% files) */
- unsigned fcull_percent; /* when to start culling (% files) */
- unsigned fstop_percent; /* when to stop allocating (% files) */
- unsigned brun_percent; /* when to stop culling (% blocks) */
- unsigned bcull_percent; /* when to start culling (% blocks) */
- unsigned bstop_percent; /* when to stop allocating (% blocks) */
- unsigned bsize; /* cache's block size */
- unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
- uint64_t frun; /* when to stop culling */
- uint64_t fcull; /* when to start culling */
- uint64_t fstop; /* when to stop allocating */
- sector_t brun; /* when to stop culling */
- sector_t bcull; /* when to start culling */
- sector_t bstop; /* when to stop allocating */
- unsigned long flags;
-#define CACHEFILES_READY 0 /* T if cache prepared */
-#define CACHEFILES_DEAD 1 /* T if cache dead */
-#define CACHEFILES_CULLING 2 /* T if cull engaged */
-#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
- char *rootdirname; /* name of cache root directory */
- char *secctx; /* LSM security context */
- char *tag; /* cache binding tag */
-};
-
-/*
- * note change of state for daemon
- */
-static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
-{
- set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
- wake_up_all(&cache->daemon_pollwq);
-}
-
-/*
- * bind.c
- */
-extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args);
-extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
-
-/*
- * daemon.c
- */
-extern const struct file_operations cachefiles_daemon_fops;
-
-/*
- * security.c
- */
-extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
-extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
- struct dentry *root,
- const struct cred **_saved_cred);
-
-static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
- const struct cred **_saved_cred)
-{
- *_saved_cred = override_creds(cache->cache_cred);
-}
-
-static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
- const struct cred *saved_cred)
-{
- revert_creds(saved_cred);
-}
-
-
-/*
- * debug tracing
- */
-#define dbgprintk(FMT, ...) \
- printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
-
-#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
-#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
-#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
-
-
-#if defined(__KDEBUG)
-#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
-#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
-#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
-
-#elif defined(CONFIG_CACHEFILES_DEBUG)
-#define _enter(FMT, ...) \
-do { \
- if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
- kenter(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#define _leave(FMT, ...) \
-do { \
- if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
- kleave(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#define _debug(FMT, ...) \
-do { \
- if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
- kdebug(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#else
-#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
-#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
-#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
-#endif
-
-#if 1 /* defined(__KDEBUGALL) */
-
-#define ASSERT(X) \
-do { \
- if (unlikely(!(X))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTCMP(X, OP, Y) \
-do { \
- if (unlikely(!((X) OP (Y)))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- pr_err("%lx " #OP " %lx is false\n", \
- (unsigned long)(X), (unsigned long)(Y)); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTIF(C, X) \
-do { \
- if (unlikely((C) && !(X))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTIFCMP(C, X, OP, Y) \
-do { \
- if (unlikely((C) && !((X) OP (Y)))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- pr_err("%lx " #OP " %lx is false\n", \
- (unsigned long)(X), (unsigned long)(Y)); \
- BUG(); \
- } \
-} while (0)
-
-#else
-
-#define ASSERT(X) do {} while (0)
-#define ASSERTCMP(X, OP, Y) do {} while (0)
-#define ASSERTIF(C, X) do {} while (0)
-#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
-
-#endif
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Network filesystem caching backend to use cache files on a premounted
- * filesystem
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/namei.h>
-#include <linux/mount.h>
-#include <linux/statfs.h>
-#include <linux/sysctl.h>
-#include <linux/miscdevice.h>
-#include "internal.h"
-
-unsigned cachefiles_debug;
-module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
-
-MODULE_DESCRIPTION("Mounted-filesystem based cache");
-MODULE_AUTHOR("Red Hat, Inc.");
-MODULE_LICENSE("GPL");
-
-static struct miscdevice cachefiles_dev = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "cachefiles",
- .fops = &cachefiles_daemon_fops,
-};
-
-/*
- * initialise the fs caching module
- */
-static int __init cachefiles_init(void)
-{
- int ret;
-
- ret = misc_register(&cachefiles_dev);
- if (ret < 0)
- goto error_dev;
-
- pr_info("Loaded\n");
- return 0;
-
-error_dev:
- pr_err("failed to register: %d\n", ret);
- return ret;
-}
-
-fs_initcall(cachefiles_init);
-
-/*
- * clean up on module removal
- */
-static void __exit cachefiles_exit(void)
-{
- pr_info("Unloading\n");
-
- misc_deregister(&cachefiles_dev);
-}
-
-module_exit(cachefiles_exit);
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* CacheFiles security management
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/fs.h>
-#include <linux/cred.h>
-#include "internal.h"
-
-/*
- * determine the security context within which we access the cache from within
- * the kernel
- */
-int cachefiles_get_security_ID(struct cachefiles_cache *cache)
-{
- struct cred *new;
- int ret;
-
- _enter("{%s}", cache->secctx);
-
- new = prepare_kernel_cred(current);
- if (!new) {
- ret = -ENOMEM;
- goto error;
- }
-
- if (cache->secctx) {
- ret = set_security_override_from_ctx(new, cache->secctx);
- if (ret < 0) {
- put_cred(new);
- pr_err("Security denies permission to nominate security context: error %d\n",
- ret);
- goto error;
- }
- }
-
- cache->cache_cred = new;
- ret = 0;
-error:
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * see if mkdir and create can be performed in the root directory
- */
-static int cachefiles_check_cache_dir(struct cachefiles_cache *cache,
- struct dentry *root)
-{
- int ret;
-
- ret = security_inode_mkdir(d_backing_inode(root), root, 0);
- if (ret < 0) {
- pr_err("Security denies permission to make dirs: error %d",
- ret);
- return ret;
- }
-
- ret = security_inode_create(d_backing_inode(root), root, 0);
- if (ret < 0)
- pr_err("Security denies permission to create files: error %d",
- ret);
-
- return ret;
-}
-
-/*
- * check the security details of the on-disk cache
- * - must be called with security override in force
- * - must return with a security override in force - even in the case of an
- * error
- */
-int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
- struct dentry *root,
- const struct cred **_saved_cred)
-{
- struct cred *new;
- int ret;
-
- _enter("");
-
- /* duplicate the cache creds for COW (the override is currently in
- * force, so we can use prepare_creds() to do this) */
- new = prepare_creds();
- if (!new)
- return -ENOMEM;
-
- cachefiles_end_secure(cache, *_saved_cred);
-
- /* use the cache root dir's security context as the basis with
- * which create files */
- ret = set_create_files_as(new, d_backing_inode(root));
- if (ret < 0) {
- abort_creds(new);
- cachefiles_begin_secure(cache, _saved_cred);
- _leave(" = %d [cfa]", ret);
- return ret;
- }
-
- put_cred(cache->cache_cred);
- cache->cache_cred = new;
-
- cachefiles_begin_secure(cache, _saved_cred);
- ret = cachefiles_check_cache_dir(cache, root);
-
- if (ret == -EOPNOTSUPP)
- ret = 0;
- _leave(" = %d", ret);
- return ret;
-}
projects / ceph-client.git / commitdiff