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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…
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…/git/mszeredi/fuse

Pull fuse updates from Miklos Szeredi:
 "The biggest part of this pull request is a patch series from Maxim
  Patlasov to optimize scatter-gather direct IO.  There's also the
  addition of a "readdirplus" API, poll events and various fixes and
  cleanups.

  There's a one line change outside of fuse to mm/filemap.c which makes
  the argument of iov_iter_single_seg_count() const, required by Maxim's
  patches."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (22 commits)
  fuse: allow control of adaptive readdirplus use
  Synchronize fuse header with one used in library
  fuse: send poll events
  fuse: don't WARN when nlink is zero
  fuse: avoid out-of-scope stack access
  fuse: bump version for READDIRPLUS
  FUSE: Adapt readdirplus to application usage patterns
  Do not use RCU for current process credentials
  fuse: cleanup fuse_direct_io()
  fuse: optimize __fuse_direct_io()
  fuse: optimize fuse_get_user_pages()
  fuse: pass iov[] to fuse_get_user_pages()
  mm: minor cleanup of iov_iter_single_seg_count()
  fuse: use req->page_descs[] for argpages cases
  fuse: add per-page descriptor <offset, length> to fuse_req
  fuse: rework fuse_do_ioctl()
  fuse: rework fuse_perform_write()
  fuse: rework fuse_readpages()
  fuse: rework fuse_retrieve()
  fuse: categorize fuse_get_req()
  ...
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Linus Torvalds committed Feb 21, 2013
2 parents 2608e3d + 634734b commit c4bc705
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Showing 9 changed files with 609 additions and 180 deletions.
10 changes: 7 additions & 3 deletions fs/fuse/cuse.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -91,19 +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)
Expand Down Expand Up @@ -419,7 +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;
Expand Down Expand Up @@ -449,6 +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);
Expand Down
128 changes: 96 additions & 32 deletions fs/fuse/dev.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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);
}

Expand Down Expand Up @@ -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;
Expand All @@ -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;
Expand Down Expand Up @@ -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);
Expand All @@ -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);

Expand Down Expand Up @@ -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;
Expand All @@ -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,
Expand Down Expand Up @@ -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
Expand Down Expand Up @@ -850,20 +910,18 @@ 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);
if (err)
return err;

nbytes -= count;
count = min(nbytes, (unsigned) PAGE_SIZE);
offset = 0;
}
return 0;
}
Expand Down Expand Up @@ -1536,29 +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;

num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
num_pages = min(num_pages, FUSE_MAX_PAGES_PER_REQ);

req = fuse_get_req(fc);
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;

Expand All @@ -1568,6 +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;
Expand Down
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