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fuse: pull iov_iter initializations up
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... to fuse_direct_{read,write}().  ->direct_IO() path uses the
iov_iter passed by the caller instead.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Al Viro committed May 6, 2014
1 parent 7b2c99d commit d22a943
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Showing 3 changed files with 38 additions and 30 deletions.
8 changes: 6 additions & 2 deletions fs/fuse/cuse.c
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Original file line number Diff line number Diff line change
Expand Up @@ -94,8 +94,10 @@ static ssize_t cuse_read(struct file *file, char __user *buf, size_t count,
loff_t pos = 0;
struct iovec iov = { .iov_base = buf, .iov_len = count };
struct fuse_io_priv io = { .async = 0, .file = file };
struct iov_iter ii;
iov_iter_init(&ii, READ, &iov, 1, count);

return fuse_direct_io(&io, &iov, 1, count, &pos, FUSE_DIO_CUSE);
return fuse_direct_io(&io, &ii, &pos, FUSE_DIO_CUSE);
}

static ssize_t cuse_write(struct file *file, const char __user *buf,
Expand All @@ -104,12 +106,14 @@ static ssize_t cuse_write(struct file *file, const char __user *buf,
loff_t pos = 0;
struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count };
struct fuse_io_priv io = { .async = 0, .file = file };
struct iov_iter ii;
iov_iter_init(&ii, WRITE, &iov, 1, count);

/*
* No locking or generic_write_checks(), the server is
* responsible for locking and sanity checks.
*/
return fuse_direct_io(&io, &iov, 1, count, &pos,
return fuse_direct_io(&io, &ii, &pos,
FUSE_DIO_WRITE | FUSE_DIO_CUSE);
}

Expand Down
55 changes: 30 additions & 25 deletions fs/fuse/file.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1368,9 +1368,8 @@ static inline int fuse_iter_npages(const struct iov_iter *ii_p)
return min(npages, FUSE_MAX_PAGES_PER_REQ);
}

ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
unsigned long nr_segs, size_t count, loff_t *ppos,
int flags)
ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
loff_t *ppos, int flags)
{
int write = flags & FUSE_DIO_WRITE;
int cuse = flags & FUSE_DIO_CUSE;
Expand All @@ -1380,18 +1379,16 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
struct fuse_conn *fc = ff->fc;
size_t nmax = write ? fc->max_write : fc->max_read;
loff_t pos = *ppos;
size_t count = iov_iter_count(iter);
pgoff_t idx_from = pos >> PAGE_CACHE_SHIFT;
pgoff_t idx_to = (pos + count - 1) >> PAGE_CACHE_SHIFT;
ssize_t res = 0;
struct fuse_req *req;
struct iov_iter ii;

iov_iter_init(&ii, write ? WRITE : READ, iov, nr_segs, count);

if (io->async)
req = fuse_get_req_for_background(fc, fuse_iter_npages(&ii));
req = fuse_get_req_for_background(fc, fuse_iter_npages(iter));
else
req = fuse_get_req(fc, fuse_iter_npages(&ii));
req = fuse_get_req(fc, fuse_iter_npages(iter));
if (IS_ERR(req))
return PTR_ERR(req);

Expand All @@ -1407,7 +1404,7 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
size_t nres;
fl_owner_t owner = current->files;
size_t nbytes = min(count, nmax);
int err = fuse_get_user_pages(req, &ii, &nbytes, write);
int err = fuse_get_user_pages(req, iter, &nbytes, write);
if (err) {
res = err;
break;
Expand Down Expand Up @@ -1437,9 +1434,9 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
fuse_put_request(fc, req);
if (io->async)
req = fuse_get_req_for_background(fc,
fuse_iter_npages(&ii));
fuse_iter_npages(iter));
else
req = fuse_get_req(fc, fuse_iter_npages(&ii));
req = fuse_get_req(fc, fuse_iter_npages(iter));
if (IS_ERR(req))
break;
}
Expand All @@ -1454,9 +1451,8 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
EXPORT_SYMBOL_GPL(fuse_direct_io);

static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos,
size_t count)
struct iov_iter *iter,
loff_t *ppos)
{
ssize_t res;
struct file *file = io->file;
Expand All @@ -1465,7 +1461,7 @@ static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
if (is_bad_inode(inode))
return -EIO;

res = fuse_direct_io(io, iov, nr_segs, count, ppos, 0);
res = fuse_direct_io(io, iter, ppos, 0);

fuse_invalidate_attr(inode);

Expand All @@ -1477,22 +1473,27 @@ static ssize_t fuse_direct_read(struct file *file, char __user *buf,
{
struct fuse_io_priv io = { .async = 0, .file = file };
struct iovec iov = { .iov_base = buf, .iov_len = count };
return __fuse_direct_read(&io, &iov, 1, ppos, count);
struct iov_iter ii;
iov_iter_init(&ii, READ, &iov, 1, count);
return __fuse_direct_read(&io, &ii, ppos);
}

static ssize_t __fuse_direct_write(struct fuse_io_priv *io,
const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos)
struct iov_iter *iter,
loff_t *ppos)
{
struct file *file = io->file;
struct inode *inode = file_inode(file);
size_t count = iov_length(iov, nr_segs);
size_t count = iov_iter_count(iter);
ssize_t res;


res = generic_write_checks(file, ppos, &count, 0);
if (!res)
res = fuse_direct_io(io, iov, nr_segs, count, ppos,
FUSE_DIO_WRITE);
if (!res) {
if (iter->count > count)
iter->count = count;
res = fuse_direct_io(io, iter, ppos, FUSE_DIO_WRITE);
}

fuse_invalidate_attr(inode);

Expand All @@ -1506,13 +1507,15 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
struct inode *inode = file_inode(file);
ssize_t res;
struct fuse_io_priv io = { .async = 0, .file = file };
struct iov_iter ii;
iov_iter_init(&ii, WRITE, &iov, 1, count);

if (is_bad_inode(inode))
return -EIO;

/* Don't allow parallel writes to the same file */
mutex_lock(&inode->i_mutex);
res = __fuse_direct_write(&io, &iov, 1, ppos);
res = __fuse_direct_write(&io, &ii, ppos);
if (res > 0)
fuse_write_update_size(inode, *ppos);
mutex_unlock(&inode->i_mutex);
Expand Down Expand Up @@ -2914,6 +2917,8 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
if (offset >= i_size)
return 0;
count = min_t(loff_t, count, fuse_round_up(i_size - offset));
if (iter->count > count)
iter->count = count;
}

io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL);
Expand Down Expand Up @@ -2943,9 +2948,9 @@ fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
io->async = false;

if (rw == WRITE)
ret = __fuse_direct_write(io, iter->iov, iter->nr_segs, &pos);
ret = __fuse_direct_write(io, iter, &pos);
else
ret = __fuse_direct_read(io, iter->iov, iter->nr_segs, &pos, count);
ret = __fuse_direct_read(io, iter, &pos);

if (io->async) {
fuse_aio_complete(io, ret < 0 ? ret : 0, -1);
Expand Down
5 changes: 2 additions & 3 deletions fs/fuse/fuse_i.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -880,9 +880,8 @@ int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
/** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
#define FUSE_DIO_CUSE (1 << 1)

ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
unsigned long nr_segs, size_t count, loff_t *ppos,
int flags);
ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
loff_t *ppos, int flags);
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,
Expand Down

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