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-rw-r--r--fs/fuse/Kconfig16
-rw-r--r--fs/fuse/cuse.c46
-rw-r--r--fs/fuse/dev.c133
-rw-r--r--fs/fuse/dir.c259
-rw-r--r--fs/fuse/file.c243
-rw-r--r--fs/fuse/fuse_i.h74
-rw-r--r--fs/fuse/inode.c16
7 files changed, 588 insertions, 199 deletions
diff --git a/fs/fuse/Kconfig b/fs/fuse/Kconfig
index 0cf160a94ed..1b2f6c2c3aa 100644
--- a/fs/fuse/Kconfig
+++ b/fs/fuse/Kconfig
@@ -4,12 +4,24 @@ config FUSE_FS
With FUSE it is possible to implement a fully functional filesystem
in a userspace program.
- There's also companion library: libfuse. This library along with
- utilities is available from the FUSE homepage:
+ There's also a companion library: libfuse2. This library is available
+ from the FUSE homepage:
<http://fuse.sourceforge.net/>
+ although chances are your distribution already has that library
+ installed if you've installed the "fuse" package itself.
See <file:Documentation/filesystems/fuse.txt> for more information.
See <file:Documentation/Changes> for needed library/utility version.
If you want to develop a userspace FS, or if you want to use
a filesystem based on FUSE, answer Y or M.
+
+config CUSE
+ tristate "Character device in Userspace support"
+ depends on FUSE_FS
+ help
+ This FUSE extension allows character devices to be
+ implemented in userspace.
+
+ If you want to develop or use a userspace character device
+ based on CUSE, answer Y or M.
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index ee8d5504229..6f96a8def14 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -45,7 +45,6 @@
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <linux/slab.h>
-#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/module.h>
@@ -63,7 +62,7 @@ struct cuse_conn {
bool unrestricted_ioctl;
};
-static DEFINE_SPINLOCK(cuse_lock); /* protects cuse_conntbl */
+static DEFINE_MUTEX(cuse_lock); /* protects registration */
static struct list_head cuse_conntbl[CUSE_CONNTBL_LEN];
static struct class *cuse_class;
@@ -92,19 +91,22 @@ static ssize_t cuse_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
loff_t pos = 0;
+ struct iovec iov = { .iov_base = buf, .iov_len = count };
- return fuse_direct_io(file, buf, count, &pos, 0);
+ return fuse_direct_io(file, &iov, 1, count, &pos, 0);
}
static ssize_t cuse_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
loff_t pos = 0;
+ struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count };
+
/*
* No locking or generic_write_checks(), the server is
* responsible for locking and sanity checks.
*/
- return fuse_direct_io(file, buf, count, &pos, 1);
+ return fuse_direct_io(file, &iov, 1, count, &pos, 1);
}
static int cuse_open(struct inode *inode, struct file *file)
@@ -114,14 +116,14 @@ static int cuse_open(struct inode *inode, struct file *file)
int rc;
/* look up and get the connection */
- spin_lock(&cuse_lock);
+ mutex_lock(&cuse_lock);
list_for_each_entry(pos, cuse_conntbl_head(devt), list)
if (pos->dev->devt == devt) {
fuse_conn_get(&pos->fc);
cc = pos;
break;
}
- spin_unlock(&cuse_lock);
+ mutex_unlock(&cuse_lock);
/* dead? */
if (!cc)
@@ -267,7 +269,7 @@ static int cuse_parse_one(char **pp, char *end, char **keyp, char **valp)
static int cuse_parse_devinfo(char *p, size_t len, struct cuse_devinfo *devinfo)
{
char *end = p + len;
- char *key, *val;
+ char *uninitialized_var(key), *uninitialized_var(val);
int rc;
while (true) {
@@ -305,14 +307,14 @@ static void cuse_gendev_release(struct device *dev)
*/
static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
{
- struct cuse_conn *cc = fc_to_cc(fc);
+ struct cuse_conn *cc = fc_to_cc(fc), *pos;
struct cuse_init_out *arg = req->out.args[0].value;
struct page *page = req->pages[0];
struct cuse_devinfo devinfo = { };
struct device *dev;
struct cdev *cdev;
dev_t devt;
- int rc;
+ int rc, i;
if (req->out.h.error ||
arg->major != FUSE_KERNEL_VERSION || arg->minor < 11) {
@@ -356,15 +358,24 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
dev_set_drvdata(dev, cc);
dev_set_name(dev, "%s", devinfo.name);
+ mutex_lock(&cuse_lock);
+
+ /* make sure the device-name is unique */
+ for (i = 0; i < CUSE_CONNTBL_LEN; ++i) {
+ list_for_each_entry(pos, &cuse_conntbl[i], list)
+ if (!strcmp(dev_name(pos->dev), dev_name(dev)))
+ goto err_unlock;
+ }
+
rc = device_add(dev);
if (rc)
- goto err_device;
+ goto err_unlock;
/* register cdev */
rc = -ENOMEM;
cdev = cdev_alloc();
if (!cdev)
- goto err_device;
+ goto err_unlock;
cdev->owner = THIS_MODULE;
cdev->ops = &cuse_frontend_fops;
@@ -377,9 +388,8 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
cc->cdev = cdev;
/* make the device available */
- spin_lock(&cuse_lock);
list_add(&cc->list, cuse_conntbl_head(devt));
- spin_unlock(&cuse_lock);
+ mutex_unlock(&cuse_lock);
/* announce device availability */
dev_set_uevent_suppress(dev, 0);
@@ -391,7 +401,8 @@ out:
err_cdev:
cdev_del(cdev);
-err_device:
+err_unlock:
+ mutex_unlock(&cuse_lock);
put_device(dev);
err_region:
unregister_chrdev_region(devt, 1);
@@ -411,7 +422,7 @@ static int cuse_send_init(struct cuse_conn *cc)
BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE);
- req = fuse_get_req(fc);
+ req = fuse_get_req(fc, 1);
if (IS_ERR(req)) {
rc = PTR_ERR(req);
goto err;
@@ -441,6 +452,7 @@ static int cuse_send_init(struct cuse_conn *cc)
req->out.argvar = 1;
req->out.argpages = 1;
req->pages[0] = page;
+ req->page_descs[0].length = req->out.args[1].size;
req->num_pages = 1;
req->end = cuse_process_init_reply;
fuse_request_send_background(fc, req);
@@ -520,9 +532,9 @@ static int cuse_channel_release(struct inode *inode, struct file *file)
int rc;
/* remove from the conntbl, no more access from this point on */
- spin_lock(&cuse_lock);
+ mutex_lock(&cuse_lock);
list_del_init(&cc->list);
- spin_unlock(&cuse_lock);
+ mutex_unlock(&cuse_lock);
/* remove device */
if (cc->dev)
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index c16335315e5..e9bdec0b16d 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -34,34 +34,67 @@ static struct fuse_conn *fuse_get_conn(struct file *file)
return file->private_data;
}
-static void fuse_request_init(struct fuse_req *req)
+static void fuse_request_init(struct fuse_req *req, struct page **pages,
+ struct fuse_page_desc *page_descs,
+ unsigned npages)
{
memset(req, 0, sizeof(*req));
+ memset(pages, 0, sizeof(*pages) * npages);
+ memset(page_descs, 0, sizeof(*page_descs) * npages);
INIT_LIST_HEAD(&req->list);
INIT_LIST_HEAD(&req->intr_entry);
init_waitqueue_head(&req->waitq);
atomic_set(&req->count, 1);
+ req->pages = pages;
+ req->page_descs = page_descs;
+ req->max_pages = npages;
}
-struct fuse_req *fuse_request_alloc(void)
+static struct fuse_req *__fuse_request_alloc(unsigned npages, gfp_t flags)
{
- struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_KERNEL);
- if (req)
- fuse_request_init(req);
+ struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, flags);
+ if (req) {
+ struct page **pages;
+ struct fuse_page_desc *page_descs;
+
+ if (npages <= FUSE_REQ_INLINE_PAGES) {
+ pages = req->inline_pages;
+ page_descs = req->inline_page_descs;
+ } else {
+ pages = kmalloc(sizeof(struct page *) * npages, flags);
+ page_descs = kmalloc(sizeof(struct fuse_page_desc) *
+ npages, flags);
+ }
+
+ if (!pages || !page_descs) {
+ kfree(pages);
+ kfree(page_descs);
+ kmem_cache_free(fuse_req_cachep, req);
+ return NULL;
+ }
+
+ fuse_request_init(req, pages, page_descs, npages);
+ }
return req;
}
+
+struct fuse_req *fuse_request_alloc(unsigned npages)
+{
+ return __fuse_request_alloc(npages, GFP_KERNEL);
+}
EXPORT_SYMBOL_GPL(fuse_request_alloc);
-struct fuse_req *fuse_request_alloc_nofs(void)
+struct fuse_req *fuse_request_alloc_nofs(unsigned npages)
{
- struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, GFP_NOFS);
- if (req)
- fuse_request_init(req);
- return req;
+ return __fuse_request_alloc(npages, GFP_NOFS);
}
void fuse_request_free(struct fuse_req *req)
{
+ if (req->pages != req->inline_pages) {
+ kfree(req->pages);
+ kfree(req->page_descs);
+ }
kmem_cache_free(fuse_req_cachep, req);
}
@@ -97,7 +130,7 @@ static void fuse_req_init_context(struct fuse_req *req)
req->in.h.pid = current->pid;
}
-struct fuse_req *fuse_get_req(struct fuse_conn *fc)
+struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages)
{
struct fuse_req *req;
sigset_t oldset;
@@ -116,7 +149,7 @@ struct fuse_req *fuse_get_req(struct fuse_conn *fc)
if (!fc->connected)
goto out;
- req = fuse_request_alloc();
+ req = fuse_request_alloc(npages);
err = -ENOMEM;
if (!req)
goto out;
@@ -165,7 +198,7 @@ static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req)
struct fuse_file *ff = file->private_data;
spin_lock(&fc->lock);
- fuse_request_init(req);
+ fuse_request_init(req, req->pages, req->page_descs, req->max_pages);
BUG_ON(ff->reserved_req);
ff->reserved_req = req;
wake_up_all(&fc->reserved_req_waitq);
@@ -186,13 +219,14 @@ static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req)
* filesystem should not have it's own file open. If deadlock is
* intentional, it can still be broken by "aborting" the filesystem.
*/
-struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file)
+struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
+ struct file *file)
{
struct fuse_req *req;
atomic_inc(&fc->num_waiting);
wait_event(fc->blocked_waitq, !fc->blocked);
- req = fuse_request_alloc();
+ req = fuse_request_alloc(0);
if (!req)
req = get_reserved_req(fc, file);
@@ -406,9 +440,8 @@ __acquires(fc->lock)
}
}
-void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
+static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
{
- req->isreply = 1;
spin_lock(&fc->lock);
if (!fc->connected)
req->out.h.error = -ENOTCONN;
@@ -425,6 +458,12 @@ void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
}
spin_unlock(&fc->lock);
}
+
+void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
+{
+ req->isreply = 1;
+ __fuse_request_send(fc, req);
+}
EXPORT_SYMBOL_GPL(fuse_request_send);
static void fuse_request_send_nowait_locked(struct fuse_conn *fc,
@@ -491,6 +530,27 @@ void fuse_request_send_background_locked(struct fuse_conn *fc,
fuse_request_send_nowait_locked(fc, req);
}
+void fuse_force_forget(struct file *file, u64 nodeid)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_forget_in inarg;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.nlookup = 1;
+ req = fuse_get_req_nofail_nopages(fc, file);
+ req->in.h.opcode = FUSE_FORGET;
+ req->in.h.nodeid = nodeid;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ req->isreply = 0;
+ __fuse_request_send(fc, req);
+ /* ignore errors */
+ fuse_put_request(fc, req);
+}
+
/*
* Lock the request. Up to the next unlock_request() there mustn't be
* anything that could cause a page-fault. If the request was already
@@ -692,8 +752,6 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
struct page *oldpage = *pagep;
struct page *newpage;
struct pipe_buffer *buf = cs->pipebufs;
- struct address_space *mapping;
- pgoff_t index;
unlock_request(cs->fc, cs->req);
fuse_copy_finish(cs);
@@ -724,9 +782,6 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
if (fuse_check_page(newpage) != 0)
goto out_fallback_unlock;
- mapping = oldpage->mapping;
- index = oldpage->index;
-
/*
* This is a new and locked page, it shouldn't be mapped or
* have any special flags on it
@@ -855,11 +910,11 @@ static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
{
unsigned i;
struct fuse_req *req = cs->req;
- unsigned offset = req->page_offset;
- unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset);
for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) {
int err;
+ unsigned offset = req->page_descs[i].offset;
+ unsigned count = min(nbytes, req->page_descs[i].length);
err = fuse_copy_page(cs, &req->pages[i], offset, count,
zeroing);
@@ -867,8 +922,6 @@ static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
return err;
nbytes -= count;
- count = min(nbytes, (unsigned) PAGE_SIZE);
- offset = 0;
}
return 0;
}
@@ -1541,29 +1594,34 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
unsigned int num;
unsigned int offset;
size_t total_len = 0;
+ int num_pages;
+
+ offset = outarg->offset & ~PAGE_CACHE_MASK;
+ file_size = i_size_read(inode);
+
+ num = outarg->size;
+ if (outarg->offset > file_size)
+ num = 0;
+ else if (outarg->offset + num > file_size)
+ num = file_size - outarg->offset;
- req = fuse_get_req(fc);
+ num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ num_pages = min(num_pages, FUSE_MAX_PAGES_PER_REQ);
+
+ req = fuse_get_req(fc, num_pages);
if (IS_ERR(req))
return PTR_ERR(req);
- offset = outarg->offset & ~PAGE_CACHE_MASK;
-
req->in.h.opcode = FUSE_NOTIFY_REPLY;
req->in.h.nodeid = outarg->nodeid;
req->in.numargs = 2;
req->in.argpages = 1;
- req->page_offset = offset;
+ req->page_descs[0].offset = offset;
req->end = fuse_retrieve_end;
index = outarg->offset >> PAGE_CACHE_SHIFT;
- file_size = i_size_read(inode);
- num = outarg->size;
- if (outarg->offset > file_size)
- num = 0;
- else if (outarg->offset + num > file_size)
- num = file_size - outarg->offset;
- while (num && req->num_pages < FUSE_MAX_PAGES_PER_REQ) {
+ while (num && req->num_pages < num_pages) {
struct page *page;
unsigned int this_num;
@@ -1573,6 +1631,7 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset);
req->pages[req->num_pages] = page;
+ req->page_descs[req->num_pages].length = this_num;
req->num_pages++;
offset = 0;
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index b7c09f9eb40..85065221a58 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -14,6 +14,29 @@
#include <linux/namei.h>
#include <linux/slab.h>
+static bool fuse_use_readdirplus(struct inode *dir, struct file *filp)
+{
+ struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_inode *fi = get_fuse_inode(dir);
+
+ if (!fc->do_readdirplus)
+ return false;
+ if (!fc->readdirplus_auto)
+ return true;
+ if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
+ return true;
+ if (filp->f_pos == 0)
+ return true;
+ return false;
+}
+
+static void fuse_advise_use_readdirplus(struct inode *dir)
+{
+ struct fuse_inode *fi = get_fuse_inode(dir);
+
+ set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);
+}
+
#if BITS_PER_LONG >= 64
static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
{
@@ -178,7 +201,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
return -ECHILD;
fc = get_fuse_conn(inode);
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return 0;
@@ -219,6 +242,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
attr_version);
fuse_change_entry_timeout(entry, &outarg);
}
+ fuse_advise_use_readdirplus(inode);
return 1;
}
@@ -271,7 +295,7 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
if (name->len > FUSE_NAME_MAX)
goto out;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
err = PTR_ERR(req);
if (IS_ERR(req))
goto out;
@@ -355,6 +379,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
else
fuse_invalidate_entry_cache(entry);
+ fuse_advise_use_readdirplus(dir);
return newent;
out_iput:
@@ -391,7 +416,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
if (!forget)
goto out_err;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
err = PTR_ERR(req);
if (IS_ERR(req))
goto out_put_forget_req;
@@ -592,7 +617,7 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
{
struct fuse_mknod_in inarg;
struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -623,7 +648,7 @@ static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
{
struct fuse_mkdir_in inarg;
struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -647,7 +672,7 @@ static int fuse_symlink(struct inode *dir, struct dentry *entry,
{
struct fuse_conn *fc = get_fuse_conn(dir);
unsigned len = strlen(link) + 1;
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -664,7 +689,7 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
{
int err;
struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -682,7 +707,14 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
spin_lock(&fc->lock);
fi->attr_version = ++fc->attr_version;
- drop_nlink(inode);
+ /*
+ * If i_nlink == 0 then unlink doesn't make sense, yet this can
+ * happen if userspace filesystem is careless. It would be
+ * difficult to enforce correct nlink usage so just ignore this
+ * condition here
+ */
+ if (inode->i_nlink > 0)
+ drop_nlink(inode);
spin_unlock(&fc->lock);
fuse_invalidate_attr(inode);
fuse_invalidate_attr(dir);
@@ -696,7 +728,7 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
int err;
struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -723,7 +755,7 @@ static int fuse_rename(struct inode *olddir, struct dentry *oldent,
int err;
struct fuse_rename_in inarg;
struct fuse_conn *fc = get_fuse_conn(olddir);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -776,7 +808,7 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
struct fuse_link_in inarg;
struct inode *inode = entry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -848,7 +880,7 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
struct fuse_req *req;
u64 attr_version;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -985,7 +1017,7 @@ int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
/*
* Calling into a user-controlled filesystem gives the filesystem
- * daemon ptrace-like capabilities over the requester process. This
+ * daemon ptrace-like capabilities over the current process. This
* means, that the filesystem daemon is able to record the exact
* filesystem operations performed, and can also control the behavior
* of the requester process in otherwise impossible ways. For example
@@ -996,27 +1028,23 @@ int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
* for which the owner of the mount has ptrace privilege. This
* excludes processes started by other users, suid or sgid processes.
*/
-int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
+int fuse_allow_current_process(struct fuse_conn *fc)
{
const struct cred *cred;
- int ret;
if (fc->flags & FUSE_ALLOW_OTHER)
return 1;
- rcu_read_lock();
- ret = 0;
- cred = __task_cred(task);
+ cred = current_cred();
if (uid_eq(cred->euid, fc->user_id) &&
uid_eq(cred->suid, fc->user_id) &&
uid_eq(cred->uid, fc->user_id) &&
gid_eq(cred->egid, fc->group_id) &&
gid_eq(cred->sgid, fc->group_id) &&
gid_eq(cred->gid, fc->group_id))
- ret = 1;
- rcu_read_unlock();
+ return 1;
- return ret;
+ return 0;
}
static int fuse_access(struct inode *inode, int mask)
@@ -1029,7 +1057,7 @@ static int fuse_access(struct inode *inode, int mask)
if (fc->no_access)
return 0;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1077,7 +1105,7 @@ static int fuse_permission(struct inode *inode, int mask)
bool refreshed = false;
int err = 0;
- if (!fuse_allow_task(fc, current))
+ if (!fuse_allow_current_process(fc))
return -EACCES;
/*
@@ -1155,19 +1183,157 @@ static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
return 0;
}
-static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
+static int fuse_direntplus_link(struct file *file,
+ struct fuse_direntplus *direntplus,
+ u64 attr_version)
{
int err;
+ struct fuse_entry_out *o = &direntplus->entry_out;
+ struct fuse_dirent *dirent = &direntplus->dirent;
+ struct dentry *parent = file->f_path.dentry;
+ struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
+ struct dentry *dentry;
+ struct dentry *alias;
+ struct inode *dir = parent->d_inode;
+ struct fuse_conn *fc;
+ struct inode *inode;
+
+ if (!o->nodeid) {
+ /*
+ * Unlike in the case of fuse_lookup, zero nodeid does not mean
+ * ENOENT. Instead, it only means the userspace filesystem did
+ * not want to return attributes/handle for this entry.
+ *
+ * So do nothing.
+ */
+ return 0;
+ }
+
+ if (name.name[0] == '.') {
+ /*
+ * We could potentially refresh the attributes of the directory
+ * and its parent?
+ */
+ if (name.len == 1)
+ return 0;
+ if (name.name[1] == '.' && name.len == 2)
+ return 0;
+ }
+ fc = get_fuse_conn(dir);
+
+ name.hash = full_name_hash(name.name, name.len);
+ dentry = d_lookup(parent, &name);
+ if (dentry && dentry->d_inode) {
+ inode = dentry->d_inode;
+ if (get_node_id(inode) == o->nodeid) {
+ struct fuse_inode *fi;
+ fi = get_fuse_inode(inode);
+ spin_lock(&fc->lock);
+ fi->nlookup++;
+ spin_unlock(&fc->lock);
+
+ /*
+ * The other branch to 'found' comes via fuse_iget()
+ * which bumps nlookup inside
+ */
+ goto found;
+ }
+ err = d_invalidate(dentry);
+ if (err)
+ goto out;
+ dput(dentry);
+ dentry = NULL;
+ }
+
+ dentry = d_alloc(parent, &name);
+ err = -ENOMEM;
+ if (!dentry)
+ goto out;
+
+ inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
+ &o->attr, entry_attr_timeout(o), attr_version);
+ if (!inode)
+ goto out;
+
+ alias = d_materialise_unique(dentry, inode);
+ err = PTR_ERR(alias);
+ if (IS_ERR(alias))
+ goto out;
+ if (alias) {
+ dput(dentry);
+ dentry = alias;
+ }
+
+found:
+ fuse_change_attributes(inode, &o->attr, entry_attr_timeout(o),
+ attr_version);
+
+ fuse_change_entry_timeout(dentry, o);
+
+ err = 0;
+out:
+ if (dentry)
+ dput(dentry);
+ return err;
+}
+
+static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
+ void *dstbuf, filldir_t filldir, u64 attr_version)
+{
+ struct fuse_direntplus *direntplus;
+ struct fuse_dirent *dirent;
+ size_t reclen;
+ int over = 0;
+ int ret;
+
+ while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
+ direntplus = (struct fuse_direntplus *) buf;
+ dirent = &direntplus->dirent;
+ reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
+
+ if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
+ return -EIO;
+ if (reclen > nbytes)
+ break;
+
+ if (!over) {
+ /* We fill entries into dstbuf only as much as
+ it can hold. But we still continue iterating
+ over remaining entries to link them. If not,
+ we need to send a FORGET for each of those
+ which we did not link.
+ */
+ over = filldir(dstbuf, dirent->name, dirent->namelen,
+ file->f_pos, dirent->ino,
+ dirent->type);
+ file->f_pos = dirent->off;
+ }
+
+ buf += reclen;
+ nbytes -= reclen;
+
+ ret = fuse_direntplus_link(file, direntplus, attr_version);
+ if (ret)
+ fuse_force_forget(file, direntplus->entry_out.nodeid);
+ }
+
+ return 0;
+}
+
+static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
+{
+ int plus, err;
size_t nbytes;
struct page *page;
struct inode *inode = file->f_path.dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
+ u64 attr_version = 0;
if (is_bad_inode(inode))
return -EIO;
- req = fuse_get_req(fc);
+ req = fuse_get_req(fc, 1);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1176,17 +1342,34 @@ static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
fuse_put_request(fc, req);
return -ENOMEM;
}
+
+ plus = fuse_use_readdirplus(inode, file);
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
- fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
+ req->page_descs[0].length = PAGE_SIZE;
+ if (plus) {
+ attr_version = fuse_get_attr_version(fc);
+ fuse_read_fill(req, file, file->f_pos, PAGE_SIZE,
+ FUSE_READDIRPLUS);
+ } else {
+ fuse_read_fill(req, file, file->f_pos, PAGE_SIZE,
+ FUSE_READDIR);
+ }
fuse_request_send(fc, req);
nbytes = req->out.args[0].size;
err = req->out.h.error;
fuse_put_request(fc, req);
- if (!err)
- err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
- filldir);
+ if (!err) {
+ if (plus) {
+ err = parse_dirplusfile(page_address(page), nbytes,
+ file, dstbuf, filldir,
+ attr_version);
+ } else {
+ err = parse_dirfile(page_address(page), nbytes, file,
+ dstbuf, filldir);
+ }
+ }
__free_page(page);
fuse_invalidate_attr(inode); /* atime changed */
@@ -1197,7 +1380,7 @@ static char *read_link(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req = fuse_get_req_nopages(fc);
char *link;
if (IS_ERR(req))
@@ -1391,7 +1574,7 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
loff_t oldsize;
int err;
- if (!fuse_allow_task(fc, current))
+ if (!fuse_allow_current_process(fc))
return -EACCES;
if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
@@ -1410,7 +1593,7 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
if (attr->ia_valid & ATTR_SIZE)
is_truncate = true;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1500,7 +1683,7 @@ static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
struct inode *inode = entry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
- if (!fuse_allow_task(fc, current))
+ if (!fuse_allow_current_process(fc))
return -EACCES;
return fuse_update_attributes(inode, stat, NULL, NULL);
@@ -1518,7 +1701,7 @@ static int fuse_setxattr(struct dentry *entry, const char *name,
if (fc->no_setxattr)
return -EOPNOTSUPP;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1557,7 +1740,7 @@ static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
if (fc->no_getxattr)
return -EOPNOTSUPP;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1603,13 +1786,13 @@ static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
struct fuse_getxattr_out outarg;
ssize_t ret;
- if (!fuse_allow_task(fc, current))
+ if (!fuse_allow_current_process(fc))
return -EACCES;
if (fc->no_listxattr)
return -EOPNOTSUPP;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1654,7 +1837,7 @@ static int fuse_removexattr(struct dentry *entry, const char *name)
if (fc->no_removexattr)
return -EOPNOTSUPP;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index e21d4d8f87e..c8071768b95 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -25,7 +25,7 @@ static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
struct fuse_req *req;
int err;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -57,7 +57,7 @@ struct fuse_file *fuse_file_alloc(struct fuse_conn *fc)
return NULL;
ff->fc = fc;
- ff->reserved_req = fuse_request_alloc();
+ ff->reserved_req = fuse_request_alloc(0);
if (unlikely(!ff->reserved_req)) {
kfree(ff);
return NULL;
@@ -368,7 +368,7 @@ static int fuse_flush(struct file *file, fl_owner_t id)
if (fc->no_flush)
return 0;
- req = fuse_get_req_nofail(fc, file);
+ req = fuse_get_req_nofail_nopages(fc, file);
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;
inarg.lock_owner = fuse_lock_owner_id(fc, id);
@@ -436,7 +436,7 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
fuse_sync_writes(inode);
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
@@ -544,7 +544,7 @@ static int fuse_readpage(struct file *file, struct page *page)
*/
fuse_wait_on_page_writeback(inode, page->index);
- req = fuse_get_req(fc);
+ req = fuse_get_req(fc, 1);
err = PTR_ERR(req);
if (IS_ERR(req))
goto out;
@@ -555,6 +555,7 @@ static int fuse_readpage(struct file *file, struct page *page)
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
+ req->page_descs[0].length = count;
num_read = fuse_send_read(req, file, pos, count, NULL);
err = req->out.h.error;
fuse_put_request(fc, req);
@@ -641,6 +642,7 @@ struct fuse_fill_data {
struct fuse_req *req;
struct file *file;
struct inode *inode;
+ unsigned nr_pages;
};
static int fuse_readpages_fill(void *_data, struct page *page)
@@ -656,16 +658,26 @@ static int fuse_readpages_fill(void *_data, struct page *page)
(req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
(req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
req->pages[req->num_pages - 1]->index + 1 != page->index)) {
+ int nr_alloc = min_t(unsigned, data->nr_pages,
+ FUSE_MAX_PAGES_PER_REQ);
fuse_send_readpages(req, data->file);
- data->req = req = fuse_get_req(fc);
+ data->req = req = fuse_get_req(fc, nr_alloc);
if (IS_ERR(req)) {
unlock_page(page);
return PTR_ERR(req);
}
}
+
+ if (WARN_ON(req->num_pages >= req->max_pages)) {
+ fuse_put_request(fc, req);
+ return -EIO;
+ }
+
page_cache_get(page);
req->pages[req->num_pages] = page;
+ req->page_descs[req->num_pages].length = PAGE_SIZE;
req->num_pages++;
+ data->nr_pages--;
return 0;
}
@@ -676,6 +688,7 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_fill_data data;
int err;
+ int nr_alloc = min_t(unsigned, nr_pages, FUSE_MAX_PAGES_PER_REQ);
err = -EIO;
if (is_bad_inode(inode))
@@ -683,7 +696,8 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
data.file = file;
data.inode = inode;
- data.req = fuse_get_req(fc);
+ data.req = fuse_get_req(fc, nr_alloc);
+ data.nr_pages = nr_pages;
err = PTR_ERR(data.req);
if (IS_ERR(data.req))
goto out;
@@ -786,7 +800,7 @@ static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file,
res = fuse_send_write(req, file, pos, count, NULL);
- offset = req->page_offset;
+ offset = req->page_descs[0].offset;
count = res;
for (i = 0; i < req->num_pages; i++) {
struct page *page = req->pages[i];
@@ -817,7 +831,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
int err;
req->in.argpages = 1;
- req->page_offset = offset;
+ req->page_descs[0].offset = offset;
do {
size_t tmp;
@@ -857,6 +871,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
err = 0;
req->pages[req->num_pages] = page;
+ req->page_descs[req->num_pages].length = tmp;
req->num_pages++;
iov_iter_advance(ii, tmp);
@@ -869,11 +884,19 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
if (!fc->big_writes)
break;
} while (iov_iter_count(ii) && count < fc->max_write &&
- req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0);
+ req->num_pages < req->max_pages && offset == 0);
return count > 0 ? count : err;
}
+static inline unsigned fuse_wr_pages(loff_t pos, size_t len)
+{
+ return min_t(unsigned,
+ ((pos + len - 1) >> PAGE_CACHE_SHIFT) -
+ (pos >> PAGE_CACHE_SHIFT) + 1,
+ FUSE_MAX_PAGES_PER_REQ);
+}
+
static ssize_t fuse_perform_write(struct file *file,
struct address_space *mapping,
struct iov_iter *ii, loff_t pos)
@@ -889,8 +912,9 @@ static ssize_t fuse_perform_write(struct file *file,
do {
struct fuse_req *req;
ssize_t count;
+ unsigned nr_pages = fuse_wr_pages(pos, iov_iter_count(ii));
- req = fuse_get_req(fc);
+ req = fuse_get_req(fc, nr_pages);
if (IS_ERR(req)) {
err = PTR_ERR(req);
break;
@@ -1023,47 +1047,110 @@ static void fuse_release_user_pages(struct fuse_req *req, int write)
}
}
-static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
+static inline void fuse_page_descs_length_init(struct fuse_req *req,
+ unsigned index, unsigned nr_pages)
+{
+ int i;
+
+ for (i = index; i < index + nr_pages; i++)
+ req->page_descs[i].length = PAGE_SIZE -
+ req->page_descs[i].offset;
+}
+
+static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii)
+{
+ return (unsigned long)ii->iov->iov_base + ii->iov_offset;
+}
+
+static inline size_t fuse_get_frag_size(const struct iov_iter *ii,
+ size_t max_size)
+{
+ return min(iov_iter_single_seg_count(ii), max_size);
+}
+
+static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
size_t *nbytesp, int write)
{
- size_t nbytes = *nbytesp;
- unsigned long user_addr = (unsigned long) buf;
- unsigned offset = user_addr & ~PAGE_MASK;
- int npages;
+ size_t nbytes = 0; /* # bytes already packed in req */
/* Special case for kernel I/O: can copy directly into the buffer */
if (segment_eq(get_fs(), KERNEL_DS)) {
+ unsigned long user_addr = fuse_get_user_addr(ii);
+ size_t frag_size = fuse_get_frag_size(ii, *nbytesp);
+
if (write)
req->in.args[1].value = (void *) user_addr;
else
req->out.args[0].value = (void *) user_addr;
+ iov_iter_advance(ii, frag_size);
+ *nbytesp = frag_size;
return 0;
}
- nbytes = min_t(size_t, nbytes, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
- npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
- npages = clamp(npages, 1, FUSE_MAX_PAGES_PER_REQ);
- npages = get_user_pages_fast(user_addr, npages, !write, req->pages);
- if (npages < 0)
- return npages;
+ while (nbytes < *nbytesp && req->num_pages < req->max_pages) {
+ unsigned npages;
+ unsigned long user_addr = fuse_get_user_addr(ii);
+ unsigned offset = user_addr & ~PAGE_MASK;
+ size_t frag_size = fuse_get_frag_size(ii, *nbytesp - nbytes);
+ int ret;
+
+ unsigned n = req->max_pages - req->num_pages;
+ frag_size = min_t(size_t, frag_size, n << PAGE_SHIFT);
+
+ npages = (frag_size + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ npages = clamp(npages, 1U, n);
+
+ ret = get_user_pages_fast(user_addr, npages, !write,
+ &req->pages[req->num_pages]);
+ if (ret < 0)
+ return ret;
- req->num_pages = npages;
- req->page_offset = offset;
+ npages = ret;
+ frag_size = min_t(size_t, frag_size,
+ (npages << PAGE_SHIFT) - offset);
+ iov_iter_advance(ii, frag_size);
+
+ req->page_descs[req->num_pages].offset = offset;
+ fuse_page_descs_length_init(req, req->num_pages, npages);
+
+ req->num_pages += npages;
+ req->page_descs[req->num_pages - 1].length -=
+ (npages << PAGE_SHIFT) - offset - frag_size;
+
+ nbytes += frag_size;
+ }
if (write)
req->in.argpages = 1;
else
req->out.argpages = 1;
- nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
- *nbytesp = min(*nbytesp, nbytes);
+ *nbytesp = nbytes;
return 0;
}
-ssize_t fuse_direct_io(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos, int write)
+static inline int fuse_iter_npages(const struct iov_iter *ii_p)
+{
+ struct iov_iter ii = *ii_p;
+ int npages = 0;
+
+ while (iov_iter_count(&ii) && npages < FUSE_MAX_PAGES_PER_REQ) {
+ unsigned long user_addr = fuse_get_user_addr(&ii);
+ unsigned offset = user_addr & ~PAGE_MASK;
+ size_t frag_size = iov_iter_single_seg_count(&ii);
+
+ npages += (frag_size + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ iov_iter_advance(&ii, frag_size);
+ }
+
+ return min(npages, FUSE_MAX_PAGES_PER_REQ);
+}
+
+ssize_t fuse_direct_io(struct file *file, const struct iovec *iov,
+ unsigned long nr_segs, size_t count, loff_t *ppos,
+ int write)
{
struct fuse_file *ff = file->private_data;
struct fuse_conn *fc = ff->fc;
@@ -1071,8 +1158,11 @@ ssize_t fuse_direct_io(struct file *file, const char __user *buf,
loff_t pos = *ppos;
ssize_t res = 0;
struct fuse_req *req;
+ struct iov_iter ii;
+
+ iov_iter_init(&ii, iov, nr_segs, count, 0);
- req = fuse_get_req(fc);
+ req = fuse_get_req(fc, fuse_iter_npages(&ii));
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1080,7 +1170,7 @@ ssize_t fuse_direct_io(struct file *file, const char __user *buf,
size_t nres;
fl_owner_t owner = current->files;
size_t nbytes = min(count, nmax);
- int err = fuse_get_user_pages(req, buf, &nbytes, write);
+ int err = fuse_get_user_pages(req, &ii, &nbytes, write);
if (err) {
res = err;
break;
@@ -1103,12 +1193,11 @@ ssize_t fuse_direct_io(struct file *file, const char __user *buf,
count -= nres;
res += nres;
pos += nres;
- buf += nres;
if (nres != nbytes)
break;
if (count) {
fuse_put_request(fc, req);
- req = fuse_get_req(fc);
+ req = fuse_get_req(fc, fuse_iter_npages(&ii));
if (IS_ERR(req))
break;
}
@@ -1122,8 +1211,8 @@ ssize_t fuse_direct_io(struct file *file, const char __user *buf,
}
EXPORT_SYMBOL_GPL(fuse_direct_io);
-static ssize_t fuse_direct_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t __fuse_direct_read(struct file *file, const struct iovec *iov,
+ unsigned long nr_segs, loff_t *ppos)
{
ssize_t res;
struct inode *inode = file->f_path.dentry->d_inode;
@@ -1131,22 +1220,31 @@ static ssize_t fuse_direct_read(struct file *file, char __user *buf,
if (is_bad_inode(inode))
return -EIO;
- res = fuse_direct_io(file, buf, count, ppos, 0);
+ res = fuse_direct_io(file, iov, nr_segs, iov_length(iov, nr_segs),
+ ppos, 0);
fuse_invalidate_attr(inode);
return res;
}
-static ssize_t __fuse_direct_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t fuse_direct_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct iovec iov = { .iov_base = buf, .iov_len = count };
+ return __fuse_direct_read(file, &iov, 1, ppos);
+}
+
+static ssize_t __fuse_direct_write(struct file *file, const struct iovec *iov,
+ unsigned long nr_segs, loff_t *ppos)
{
struct inode *inode = file->f_path.dentry->d_inode;
+ size_t count = iov_length(iov, nr_segs);
ssize_t res;
res = generic_write_checks(file, ppos, &count, 0);
if (!res) {
- res = fuse_direct_io(file, buf, count, ppos, 1);
+ res = fuse_direct_io(file, iov, nr_segs, count, ppos, 1);
if (res > 0)
fuse_write_update_size(inode, *ppos);
}
@@ -1159,6 +1257,7 @@ static ssize_t __fuse_direct_write(struct file *file, const char __user *buf,
static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
+ struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count };
struct inode *inode = file->f_path.dentry->d_inode;
ssize_t res;
@@ -1167,7 +1266,7 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
/* Don't allow parallel writes to the same file */
mutex_lock(&inode->i_mutex);
- res = __fuse_direct_write(file, buf, count, ppos);
+ res = __fuse_direct_write(file, &iov, 1, ppos);
mutex_unlock(&inode->i_mutex);
return res;
@@ -1272,7 +1371,7 @@ static int fuse_writepage_locked(struct page *page)
set_page_writeback(page);
- req = fuse_request_alloc_nofs();
+ req = fuse_request_alloc_nofs(1);
if (!req)
goto err;
@@ -1293,7 +1392,8 @@ static int fuse_writepage_locked(struct page *page)
req->in.argpages = 1;
req->num_pages = 1;
req->pages[0] = tmp_page;
- req->page_offset = 0;
+ req->page_descs[0].offset = 0;
+ req->page_descs[0].length = PAGE_SIZE;
req->end = fuse_writepage_end;
req->inode = inode;
@@ -1471,7 +1571,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
struct fuse_lk_out outarg;
int err;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1506,7 +1606,7 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
if (fl->fl_flags & FL_CLOSE)
return 0;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -1575,7 +1675,7 @@ static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
if (!inode->i_sb->s_bdev || fc->no_bmap)
return 0;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return 0;
@@ -1873,7 +1973,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
num_pages++;
}
- req = fuse_get_req(fc);
+ req = fuse_get_req(fc, num_pages);
if (IS_ERR(req)) {
err = PTR_ERR(req);
req = NULL;
@@ -1881,6 +1981,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
}
memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages);
req->num_pages = num_pages;
+ fuse_page_descs_length_init(req, 0, req->num_pages);
/* okay, let's send it to the client */
req->in.h.opcode = FUSE_IOCTL;
@@ -1981,7 +2082,7 @@ long fuse_ioctl_common(struct file *file, unsigned int cmd,
struct inode *inode = file->f_dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
- if (!fuse_allow_task(fc, current))
+ if (!fuse_allow_current_process(fc))
return -EACCES;
if (is_bad_inode(inode))
@@ -2066,6 +2167,7 @@ unsigned fuse_file_poll(struct file *file, poll_table *wait)
return DEFAULT_POLLMASK;
poll_wait(file, &ff->poll_wait, wait);
+ inarg.events = (__u32)poll_requested_events(wait);
/*
* Ask for notification iff there's someone waiting for it.
@@ -2076,7 +2178,7 @@ unsigned fuse_file_poll(struct file *file, poll_table *wait)
fuse_register_polled_file(fc, ff);
}
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return POLLERR;
@@ -2126,41 +2228,6 @@ int fuse_notify_poll_wakeup(struct fuse_conn *fc,
return 0;
}
-static ssize_t fuse_loop_dio(struct file *filp, const struct iovec *iov,
- unsigned long nr_segs, loff_t *ppos, int rw)
-{
- const struct iovec *vector = iov;
- ssize_t ret = 0;
-
- while (nr_segs > 0) {
- void __user *base;
- size_t len;
- ssize_t nr;
-
- base = vector->iov_base;
- len = vector->iov_len;
- vector++;
- nr_segs--;
-
- if (rw == WRITE)
- nr = __fuse_direct_write(filp, base, len, ppos);
- else
- nr = fuse_direct_read(filp, base, len, ppos);
-
- if (nr < 0) {
- if (!ret)
- ret = nr;
- break;
- }
- ret += nr;
- if (nr != len)
- break;
- }
-
- return ret;
-}
-
-
static ssize_t
fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
loff_t offset, unsigned long nr_segs)
@@ -2172,13 +2239,16 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
file = iocb->ki_filp;
pos = offset;
- ret = fuse_loop_dio(file, iov, nr_segs, &pos, rw);
+ if (rw == WRITE)
+ ret = __fuse_direct_write(file, iov, nr_segs, &pos);
+ else
+ ret = __fuse_direct_read(file, iov, nr_segs, &pos);
return ret;
}
-long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
- loff_t length)
+static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
+ loff_t length)
{
struct fuse_file *ff = file->private_data;
struct fuse_conn *fc = ff->fc;
@@ -2194,7 +2264,7 @@ long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
if (fc->no_fallocate)
return -EOPNOTSUPP;
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -2213,7 +2283,6 @@ long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
return err;
}
-EXPORT_SYMBOL_GPL(fuse_file_fallocate);
static const struct file_operations fuse_file_operations = {
.llseek = fuse_file_llseek,
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index e105a53fc72..6aeba864f07 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -44,6 +44,9 @@
doing the mount will be allowed to access the filesystem */
#define FUSE_ALLOW_OTHER (1 << 1)
+/** Number of page pointers embedded in fuse_req */
+#define FUSE_REQ_INLINE_PAGES 1
+
/** List of active connections */
extern struct list_head fuse_conn_list;
@@ -103,6 +106,15 @@ struct fuse_inode {
/** List of writepage requestst (pending or sent) */
struct list_head writepages;
+
+ /** Miscellaneous bits describing inode state */
+ unsigned long state;
+};
+
+/** FUSE inode state bits */
+enum {
+ /** Advise readdirplus */
+ FUSE_I_ADVISE_RDPLUS,
};
struct fuse_conn;
@@ -200,6 +212,12 @@ struct fuse_out {
struct fuse_arg args[3];
};
+/** FUSE page descriptor */
+struct fuse_page_desc {
+ unsigned int length;
+ unsigned int offset;
+};
+
/** The request state */
enum fuse_req_state {
FUSE_REQ_INIT = 0,
@@ -291,14 +309,23 @@ struct fuse_req {
} misc;
/** page vector */
- struct page *pages[FUSE_MAX_PAGES_PER_REQ];
+ struct page **pages;
+
+ /** page-descriptor vector */
+ struct fuse_page_desc *page_descs;
+
+ /** size of the 'pages' array */
+ unsigned max_pages;
+
+ /** inline page vector */
+ struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
+
+ /** inline page-descriptor vector */
+ struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
/** number of pages in vector */
unsigned num_pages;
- /** offset of data on first page */
- unsigned page_offset;
-
/** File used in the request (or NULL) */
struct fuse_file *ff;
@@ -487,6 +514,12 @@ struct fuse_conn {
/** Use enhanced/automatic page cache invalidation. */
unsigned auto_inval_data:1;
+ /** Does the filesystem support readdirplus? */
+ unsigned do_readdirplus:1;
+
+ /** Does the filesystem want adaptive readdirplus? */
+ unsigned readdirplus_auto:1;
+
/** The number of requests waiting for completion */
atomic_t num_waiting;
@@ -578,6 +611,9 @@ void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
struct fuse_forget_link *fuse_alloc_forget(void);
+/* Used by READDIRPLUS */
+void fuse_force_forget(struct file *file, u64 nodeid);
+
/**
* Initialize READ or READDIR request
*/
@@ -658,9 +694,9 @@ void fuse_ctl_cleanup(void);
/**
* Allocate a request
*/
-struct fuse_req *fuse_request_alloc(void);
+struct fuse_req *fuse_request_alloc(unsigned npages);
-struct fuse_req *fuse_request_alloc_nofs(void);
+struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
/**
* Free a request
@@ -668,14 +704,25 @@ struct fuse_req *fuse_request_alloc_nofs(void);
void fuse_request_free(struct fuse_req *req);
/**
- * Get a request, may fail with -ENOMEM
+ * Get a request, may fail with -ENOMEM,
+ * caller should specify # elements in req->pages[] explicitly
*/
-struct fuse_req *fuse_get_req(struct fuse_conn *fc);
+struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
+
+/**
+ * Get a request, may fail with -ENOMEM,
+ * useful for callers who doesn't use req->pages[]
+ */
+static inline struct fuse_req *fuse_get_req_nopages(struct fuse_conn *fc)
+{
+ return fuse_get_req(fc, 0);
+}
/**
* Gets a requests for a file operation, always succeeds
*/
-struct fuse_req *fuse_get_req_nofail(struct fuse_conn *fc, struct file *file);
+struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
+ struct file *file);
/**
* Decrement reference count of a request. If count goes to zero free
@@ -739,9 +786,9 @@ void fuse_ctl_remove_conn(struct fuse_conn *fc);
int fuse_valid_type(int m);
/**
- * Is task allowed to perform filesystem operation?
+ * Is current process allowed to perform filesystem operation?
*/
-int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task);
+int fuse_allow_current_process(struct fuse_conn *fc);
u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
@@ -776,8 +823,9 @@ int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
bool isdir);
-ssize_t fuse_direct_io(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos, int write);
+ssize_t fuse_direct_io(struct file *file, const struct iovec *iov,
+ unsigned long nr_segs, size_t count, loff_t *ppos,
+ int write);
long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
unsigned int flags);
long fuse_ioctl_common(struct file *file, unsigned int cmd,
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 73ca6b72bea..01353ed7575 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -92,6 +92,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
fi->attr_version = 0;
fi->writectr = 0;
fi->orig_ino = 0;
+ fi->state = 0;
INIT_LIST_HEAD(&fi->write_files);
INIT_LIST_HEAD(&fi->queued_writes);
INIT_LIST_HEAD(&fi->writepages);
@@ -408,12 +409,12 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
struct fuse_statfs_out outarg;
int err;
- if (!fuse_allow_task(fc, current)) {
+ if (!fuse_allow_current_process(fc)) {
buf->f_type = FUSE_SUPER_MAGIC;
return 0;
}
- req = fuse_get_req(fc);
+ req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
@@ -863,6 +864,10 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->dont_mask = 1;
if (arg->flags & FUSE_AUTO_INVAL_DATA)
fc->auto_inval_data = 1;
+ if (arg->flags & FUSE_DO_READDIRPLUS)
+ fc->do_readdirplus = 1;
+ if (arg->flags & FUSE_READDIRPLUS_AUTO)
+ fc->readdirplus_auto = 1;
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;
@@ -889,7 +894,8 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
- FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA;
+ FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
+ FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
@@ -1034,12 +1040,12 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
/* only now - we want root dentry with NULL ->d_op */
sb->s_d_op = &fuse_dentry_operations;
- init_req = fuse_request_alloc();
+ init_req = fuse_request_alloc(0);
if (!init_req)
goto err_put_root;
if (is_bdev) {
- fc->destroy_req = fuse_request_alloc();
+ fc->destroy_req = fuse_request_alloc(0);
if (!fc->destroy_req)
goto err_free_init_req;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-22 04:56:39 +0000