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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse source 
Pull vfs updates from Al Viro:
 "This the bunch that sat in -next + lock_parent() fix.  This is the
  minimal set; there's more pending stuff.

  In particular, I really hope to get acct.c fixes merged this cycle -
  we need that to deal sanely with delayed-mntput stuff.  In the next
  pile, hopefully - that series is fairly short and localized
  (kernel/acct.c, fs/super.c and fs/namespace.c).  In this pile: more
  iov_iter work.  Most of prereqs for ->splice_write with sane locking
  order are there and Kent's dio rewrite would also fit nicely on top of
  this pile"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (70 commits)
  lock_parent: don't step on stale ->d_parent of all-but-freed one
  kill generic_file_splice_write()
  ceph: switch to iter_file_splice_write()
  shmem: switch to iter_file_splice_write()
  nfs: switch to iter_splice_write_file()
  fs/splice.c: remove unneeded exports
  ocfs2: switch to iter_file_splice_write()
  ->splice_write() via ->write_iter()
  bio_vec-backed iov_iter
  optimize copy_page_{to,from}_iter()
  bury generic_file_aio_{read,write}
  lustre: get rid of messing with iovecs
  ceph: switch to ->write_iter()
  ceph_sync_direct_write: stop poking into iov_iter guts
  ceph_sync_read: stop poking into iov_iter guts
  new helper: copy_page_from_iter()
  fuse: switch to ->write_iter()
  btrfs: switch to ->write_iter()
  ocfs2: switch to ->write_iter()
  xfs: switch to ->write_iter()
  ...
This commit is contained in:
Linus Torvalds 2014-06-12 10:30:18 -07:00
commit 16b9057804
102 changed files with 1796 additions and 2028 deletions
Download patch file Download diff file Expand all files Collapse all files

8
fs/fuse/cuse.c
View file

@ -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,
@ -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);
}

154
fs/fuse/file.c
View file

@ -933,8 +933,7 @@ out:
return err;
}
static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct inode *inode = iocb->ki_filp->f_mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
@ -945,14 +944,14 @@ static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
* i_size is up to date).
*/
if (fc->auto_inval_data ||
(pos + iov_length(iov, nr_segs) > i_size_read(inode))) {
(iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) {
int err;
err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL);
if (err)
return err;
}
return generic_file_aio_read(iocb, iov, nr_segs, pos);
return generic_file_read_iter(iocb, to);
}
static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
@ -1181,19 +1180,17 @@ static ssize_t fuse_perform_write(struct file *file,
return res > 0 ? res : err;
}
static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
size_t count = 0;
size_t ocount = 0;
size_t count = iov_iter_count(from);
ssize_t written = 0;
ssize_t written_buffered = 0;
struct inode *inode = mapping->host;
ssize_t err;
struct iov_iter i;
loff_t endbyte = 0;
loff_t pos = iocb->ki_pos;
if (get_fuse_conn(inode)->writeback_cache) {
/* Update size (EOF optimization) and mode (SUID clearing) */
@ -1201,17 +1198,9 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (err)
return err;
return generic_file_aio_write(iocb, iov, nr_segs, pos);
return generic_file_write_iter(iocb, from);
}
WARN_ON(iocb->ki_pos != pos);
ocount = 0;
err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
if (err)
return err;
count = ocount;
mutex_lock(&inode->i_mutex);
/* We can write back this queue in page reclaim */
@ -1224,6 +1213,7 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (count == 0)
goto out;
iov_iter_truncate(from, count);
err = file_remove_suid(file);
if (err)
goto out;
@ -1233,16 +1223,13 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
goto out;
if (file->f_flags & O_DIRECT) {
written = generic_file_direct_write(iocb, iov, &nr_segs, pos,
count, ocount);
if (written < 0 || written == count)
written = generic_file_direct_write(iocb, from, pos);
if (written < 0 || !iov_iter_count(from))
goto out;
pos += written;
count -= written;
iov_iter_init(&i, iov, nr_segs, count, written);
written_buffered = fuse_perform_write(file, mapping, &i, pos);
written_buffered = fuse_perform_write(file, mapping, from, pos);
if (written_buffered < 0) {
err = written_buffered;
goto out;
@ -1261,8 +1248,7 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
written += written_buffered;
iocb->ki_pos = pos + written_buffered;
} else {
iov_iter_init(&i, iov, nr_segs, count, 0);
written = fuse_perform_write(file, mapping, &i, pos);
written = fuse_perform_write(file, mapping, from, pos);
if (written >= 0)
iocb->ki_pos = pos + written;
}
@ -1300,7 +1286,7 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
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)) {
if (ii->type & ITER_KVEC) {
unsigned long user_addr = fuse_get_user_addr(ii);
size_t frag_size = fuse_get_frag_size(ii, *nbytesp);
@ -1316,35 +1302,26 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
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;
size_t start;
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]);
ssize_t ret = iov_iter_get_pages(ii,
&req->pages[req->num_pages],
n * PAGE_SIZE, &start);
if (ret < 0)
return ret;
npages = ret;
frag_size = min_t(size_t, frag_size,
(npages << PAGE_SHIFT) - offset);
iov_iter_advance(ii, frag_size);
iov_iter_advance(ii, ret);
nbytes += ret;
req->page_descs[req->num_pages].offset = offset;
ret += start;
npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE;
req->page_descs[req->num_pages].offset = start;
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;
(PAGE_SIZE - ret) & (PAGE_SIZE - 1);
}
if (write)
@ -1359,24 +1336,11 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
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);
return iov_iter_npages(ii_p, 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;
@ -1386,18 +1350,16 @@ 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, iov, nr_segs, count, 0);
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);
@ -1413,7 +1375,7 @@ 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;
@ -1443,9 +1405,9 @@ 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;
}
@ -1460,9 +1422,8 @@ 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;
@ -1471,7 +1432,7 @@ 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);
@ -1483,22 +1444,26 @@ 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) {
iov_iter_truncate(iter, count);
res = fuse_direct_io(io, iter, ppos, FUSE_DIO_WRITE);
}
fuse_invalidate_attr(inode);
@ -1512,13 +1477,15 @@ 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);
@ -2372,7 +2339,7 @@ static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov,
if (!bytes)
return 0;
iov_iter_init(&ii, iov, nr_segs, bytes, 0);
iov_iter_init(&ii, to_user ? READ : WRITE, iov, nr_segs, bytes);
while (iov_iter_count(&ii)) {
struct page *page = pages[page_idx++];
@ -2894,8 +2861,8 @@ static inline loff_t fuse_round_up(loff_t off)
}
static ssize_t
fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
loff_t offset, unsigned long nr_segs)
fuse_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter,
loff_t offset)
{
ssize_t ret = 0;
struct file *file = iocb->ki_filp;
@ -2904,7 +2871,7 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
loff_t pos = 0;
struct inode *inode;
loff_t i_size;
size_t count = iov_length(iov, nr_segs);
size_t count = iov_iter_count(iter);
struct fuse_io_priv *io;
pos = offset;
@ -2919,6 +2886,7 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
if (offset >= i_size)
return 0;
count = min_t(loff_t, count, fuse_round_up(i_size - offset));
iov_iter_truncate(iter, count);
}
io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL);
@ -2948,9 +2916,9 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
io->async = false;
if (rw == WRITE)
ret = __fuse_direct_write(io, iov, nr_segs, &pos);
ret = __fuse_direct_write(io, iter, &pos);
else
ret = __fuse_direct_read(io, iov, nr_segs, &pos, count);
ret = __fuse_direct_read(io, iter, &pos);
if (io->async) {
fuse_aio_complete(io, ret < 0 ? ret : 0, -1);
@ -3061,10 +3029,10 @@ out:
static const struct file_operations fuse_file_operations = {
.llseek = fuse_file_llseek,
.read = do_sync_read,
.aio_read = fuse_file_aio_read,
.write = do_sync_write,
.aio_write = fuse_file_aio_write,
.read = new_sync_read,
.read_iter = fuse_file_read_iter,
.write = new_sync_write,
.write_iter = fuse_file_write_iter,
.mmap = fuse_file_mmap,
.open = fuse_open,
.flush = fuse_flush,

5
fs/fuse/fuse_i.h
View file

@ -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,