Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse (9eead2a8) · Commits · EulixOS / Software / Kernel

fs/fuse/control.c

+135 −3

Original line number	Diff line number	Diff line
		@@ -61,6 +61,121 @@ static ssize_t fuse_conn_waiting_read(struct file file, char __user buf,
		return simple_read_from_buffer(buf, len, ppos, tmp, size);
		}

		static ssize_t fuse_conn_limit_read(struct file file, char __user buf,
		size_t len, loff_t *ppos, unsigned val)
		{
		char tmp[32];
		size_t size = sprintf(tmp, "%u\n", val);

		return simple_read_from_buffer(buf, len, ppos, tmp, size);
		}

		static ssize_t fuse_conn_limit_write(struct file file, const char __user buf,
		size_t count, loff_t ppos, unsigned val,
		unsigned global_limit)
		{
		unsigned long t;
		char tmp[32];
		unsigned limit = (1 << 16) - 1;
		int err;

		if (*ppos \|\| count >= sizeof(tmp) - 1)
		return -EINVAL;

		if (copy_from_user(tmp, buf, count))
		return -EINVAL;

		tmp[count] = '\0';

		err = strict_strtoul(tmp, 0, &t);
		if (err)
		return err;

		if (!capable(CAP_SYS_ADMIN))
		limit = min(limit, global_limit);

		if (t > limit)
		return -EINVAL;

		*val = t;

		return count;
		}

		static ssize_t fuse_conn_max_background_read(struct file *file,
		char __user *buf, size_t len,
		loff_t *ppos)
		{
		struct fuse_conn *fc;
		unsigned val;

		fc = fuse_ctl_file_conn_get(file);
		if (!fc)
		return 0;

		val = fc->max_background;
		fuse_conn_put(fc);

		return fuse_conn_limit_read(file, buf, len, ppos, val);
		}

		static ssize_t fuse_conn_max_background_write(struct file *file,
		const char __user *buf,
		size_t count, loff_t *ppos)
		{
		unsigned val;
		ssize_t ret;

		ret = fuse_conn_limit_write(file, buf, count, ppos, &val,
		max_user_bgreq);
		if (ret > 0) {
		struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
		if (fc) {
		fc->max_background = val;
		fuse_conn_put(fc);
		}
		}

		return ret;
		}

		static ssize_t fuse_conn_congestion_threshold_read(struct file *file,
		char __user *buf, size_t len,
		loff_t *ppos)
		{
		struct fuse_conn *fc;
		unsigned val;

		fc = fuse_ctl_file_conn_get(file);
		if (!fc)
		return 0;

		val = fc->congestion_threshold;
		fuse_conn_put(fc);

		return fuse_conn_limit_read(file, buf, len, ppos, val);
		}

		static ssize_t fuse_conn_congestion_threshold_write(struct file *file,
		const char __user *buf,
		size_t count, loff_t *ppos)
		{
		unsigned val;
		ssize_t ret;

		ret = fuse_conn_limit_write(file, buf, count, ppos, &val,
		max_user_congthresh);
		if (ret > 0) {
		struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
		if (fc) {
		fc->congestion_threshold = val;
		fuse_conn_put(fc);
		}
		}

		return ret;
		}

		static const struct file_operations fuse_ctl_abort_ops = {
		.open = nonseekable_open,
		.write = fuse_conn_abort_write,
		@@ -71,6 +186,18 @@ static const struct file_operations fuse_ctl_waiting_ops = {
		.read = fuse_conn_waiting_read,
		};

		static const struct file_operations fuse_conn_max_background_ops = {
		.open = nonseekable_open,
		.read = fuse_conn_max_background_read,
		.write = fuse_conn_max_background_write,
		};

		static const struct file_operations fuse_conn_congestion_threshold_ops = {
		.open = nonseekable_open,
		.read = fuse_conn_congestion_threshold_read,
		.write = fuse_conn_congestion_threshold_write,
		};

		static struct dentry fuse_ctl_add_dentry(struct dentry parent,
		struct fuse_conn *fc,
		const char *name,
		@@ -129,7 +256,12 @@ int fuse_ctl_add_conn(struct fuse_conn *fc)
		if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG \| 0400, 1,
		NULL, &fuse_ctl_waiting_ops) \|\|
		!fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG \| 0200, 1,
		NULL, &fuse_ctl_abort_ops))
		NULL, &fuse_ctl_abort_ops) \|\|
		!fuse_ctl_add_dentry(parent, fc, "max_background", S_IFREG \| 0600,
		1, NULL, &fuse_conn_max_background_ops) \|\|
		!fuse_ctl_add_dentry(parent, fc, "congestion_threshold",
		S_IFREG \| 0600, 1, NULL,
		&fuse_conn_congestion_threshold_ops))
		goto err;

		return 0;
		@@ -156,7 +288,7 @@ void fuse_ctl_remove_conn(struct fuse_conn *fc)
		d_drop(dentry);
		dput(dentry);
		}
		fuse_control_sb->s_root->d_inode->i_nlink--;
		drop_nlink(fuse_control_sb->s_root->d_inode);
		}

		static int fuse_ctl_fill_super(struct super_block sb, void data, int silent)

fs/fuse/dev.c

+5 −5

Original line number	Diff line number	Diff line
		@@ -250,7 +250,7 @@ static void queue_request(struct fuse_conn fc, struct fuse_req req)

		static void flush_bg_queue(struct fuse_conn *fc)
		{
		while (fc->active_background < FUSE_MAX_BACKGROUND &&
		while (fc->active_background < fc->max_background &&
		!list_empty(&fc->bg_queue)) {
		struct fuse_req *req;

		@@ -280,11 +280,11 @@ __releases(&fc->lock)
		list_del(&req->intr_entry);
		req->state = FUSE_REQ_FINISHED;
		if (req->background) {
		if (fc->num_background == FUSE_MAX_BACKGROUND) {
		if (fc->num_background == fc->max_background) {
		fc->blocked = 0;
		wake_up_all(&fc->blocked_waitq);
		}
		if (fc->num_background == FUSE_CONGESTION_THRESHOLD &&
		if (fc->num_background == fc->congestion_threshold &&
		fc->connected && fc->bdi_initialized) {
		clear_bdi_congested(&fc->bdi, BLK_RW_SYNC);
		clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC);
		@@ -410,9 +410,9 @@ static void fuse_request_send_nowait_locked(struct fuse_conn *fc,
		{
		req->background = 1;
		fc->num_background++;
		if (fc->num_background == FUSE_MAX_BACKGROUND)
		if (fc->num_background == fc->max_background)
		fc->blocked = 1;
		if (fc->num_background == FUSE_CONGESTION_THRESHOLD &&
		if (fc->num_background == fc->congestion_threshold &&
		fc->bdi_initialized) {
		set_bdi_congested(&fc->bdi, BLK_RW_SYNC);
		set_bdi_congested(&fc->bdi, BLK_RW_ASYNC);

fs/fuse/fuse_i.h

+11 −7

Original line number	Diff line number	Diff line
		@@ -25,12 +25,6 @@
		/** Max number of pages that can be used in a single read request */
		#define FUSE_MAX_PAGES_PER_REQ 32

		/** Maximum number of outstanding background requests */
		#define FUSE_MAX_BACKGROUND 12

		/** Congestion starts at 75% of maximum */
		#define FUSE_CONGESTION_THRESHOLD (FUSE_MAX_BACKGROUND * 75 / 100)

		/** Bias for fi->writectr, meaning new writepages must not be sent */
		#define FUSE_NOWRITE INT_MIN

		@@ -38,7 +32,7 @@
		#define FUSE_NAME_MAX 1024

		/** Number of dentries for each connection in the control filesystem */
		#define FUSE_CTL_NUM_DENTRIES 3
		#define FUSE_CTL_NUM_DENTRIES 5

		/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
		module will check permissions based on the file mode. Otherwise no
		@@ -55,6 +49,10 @@ extern struct list_head fuse_conn_list;
		/** Global mutex protecting fuse_conn_list and the control filesystem */
		extern struct mutex fuse_mutex;

		/** Module parameters */
		extern unsigned max_user_bgreq;
		extern unsigned max_user_congthresh;

		/** FUSE inode */
		struct fuse_inode {
		/** Inode data */
		@@ -349,6 +347,12 @@ struct fuse_conn {
		/** rbtree of fuse_files waiting for poll events indexed by ph */
		struct rb_root polled_files;

		/** Maximum number of outstanding background requests */
		unsigned max_background;

		/** Number of background requests at which congestion starts */
		unsigned congestion_threshold;

		/** Number of requests currently in the background */
		unsigned num_background;

fs/fuse/inode.c

+80 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@
		#include <linux/seq_file.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/moduleparam.h>
		#include <linux/parser.h>
		#include <linux/statfs.h>
		#include <linux/random.h>
		@@ -28,10 +29,34 @@ static struct kmem_cache *fuse_inode_cachep;
		struct list_head fuse_conn_list;
		DEFINE_MUTEX(fuse_mutex);

		static int set_global_limit(const char val, struct kernel_param kp);

		unsigned max_user_bgreq;
		module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
		&max_user_bgreq, 0644);
		__MODULE_PARM_TYPE(max_user_bgreq, "uint");
		MODULE_PARM_DESC(max_user_bgreq,
		"Global limit for the maximum number of backgrounded requests an "
		"unprivileged user can set");

		unsigned max_user_congthresh;
		module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
		&max_user_congthresh, 0644);
		__MODULE_PARM_TYPE(max_user_congthresh, "uint");
		MODULE_PARM_DESC(max_user_congthresh,
		"Global limit for the maximum congestion threshold an "
		"unprivileged user can set");

		#define FUSE_SUPER_MAGIC 0x65735546

		#define FUSE_DEFAULT_BLKSIZE 512

		/** Maximum number of outstanding background requests */
		#define FUSE_DEFAULT_MAX_BACKGROUND 12

		/** Congestion starts at 75% of maximum */
		#define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)

		struct fuse_mount_data {
		int fd;
		unsigned rootmode;
		@@ -517,6 +542,8 @@ void fuse_conn_init(struct fuse_conn *fc)
		INIT_LIST_HEAD(&fc->bg_queue);
		INIT_LIST_HEAD(&fc->entry);
		atomic_set(&fc->num_waiting, 0);
		fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
		fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
		fc->khctr = 0;
		fc->polled_files = RB_ROOT;
		fc->reqctr = 0;
		@@ -727,6 +754,54 @@ static const struct super_operations fuse_super_operations = {
		.show_options = fuse_show_options,
		};

		static void sanitize_global_limit(unsigned *limit)
		{
		if (*limit == 0)
		*limit = ((num_physpages << PAGE_SHIFT) >> 13) /
		sizeof(struct fuse_req);

		if (*limit >= 1 << 16)
		*limit = (1 << 16) - 1;
		}

		static int set_global_limit(const char val, struct kernel_param kp)
		{
		int rv;

		rv = param_set_uint(val, kp);
		if (rv)
		return rv;

		sanitize_global_limit((unsigned *)kp->arg);

		return 0;
		}

		static void process_init_limits(struct fuse_conn fc, struct fuse_init_out arg)
		{
		int cap_sys_admin = capable(CAP_SYS_ADMIN);

		if (arg->minor < 13)
		return;

		sanitize_global_limit(&max_user_bgreq);
		sanitize_global_limit(&max_user_congthresh);

		if (arg->max_background) {
		fc->max_background = arg->max_background;

		if (!cap_sys_admin && fc->max_background > max_user_bgreq)
		fc->max_background = max_user_bgreq;
		}
		if (arg->congestion_threshold) {
		fc->congestion_threshold = arg->congestion_threshold;

		if (!cap_sys_admin &&
		fc->congestion_threshold > max_user_congthresh)
		fc->congestion_threshold = max_user_congthresh;
		}
		}

		static void process_init_reply(struct fuse_conn fc, struct fuse_req req)
		{
		struct fuse_init_out *arg = &req->misc.init_out;
		@@ -736,6 +811,8 @@ static void process_init_reply(struct fuse_conn fc, struct fuse_req req)
		else {
		unsigned long ra_pages;

		process_init_limits(fc, arg);

		if (arg->minor >= 6) {
		ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
		if (arg->flags & FUSE_ASYNC_READ)
		@@ -1150,6 +1227,9 @@ static int __init fuse_init(void)
		if (res)
		goto err_sysfs_cleanup;

		sanitize_global_limit(&max_user_bgreq);
		sanitize_global_limit(&max_user_congthresh);

		return 0;

		err_sysfs_cleanup:

include/linux/fuse.h

+27 −2

Original line number	Diff line number	Diff line
		@@ -30,6 +30,10 @@
		* - add umask flag to input argument of open, mknod and mkdir
		* - add notification messages for invalidation of inodes and
		* directory entries
		*
		* 7.13
		* - make max number of background requests and congestion threshold
		* tunables
		*/

		#ifndef _LINUX_FUSE_H
		@@ -37,11 +41,31 @@

		#include <linux/types.h>

		/*
		* Version negotiation:
		*
		* Both the kernel and userspace send the version they support in the
		* INIT request and reply respectively.
		*
		* If the major versions match then both shall use the smallest
		* of the two minor versions for communication.
		*
		* If the kernel supports a larger major version, then userspace shall
		* reply with the major version it supports, ignore the rest of the
		* INIT message and expect a new INIT message from the kernel with a
		* matching major version.
		*
		* If the library supports a larger major version, then it shall fall
		* back to the major protocol version sent by the kernel for
		* communication and reply with that major version (and an arbitrary
		* supported minor version).
		*/

		/** Version number of this interface */
		#define FUSE_KERNEL_VERSION 7

		/** Minor version number of this interface */
		#define FUSE_KERNEL_MINOR_VERSION 12
		#define FUSE_KERNEL_MINOR_VERSION 13

		/** The node ID of the root inode */
		#define FUSE_ROOT_ID 1
		@@ -427,7 +451,8 @@ struct fuse_init_out {
		__u32 minor;
		__u32 max_readahead;
		__u32 flags;
		__u32 unused;
		__u16 max_background;
		__u16 congestion_threshold;
		__u32 max_write;
		};