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fs: implement vfs_iter_write using do_iter_write

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De-dupliate some code and allow for passing the flags argument to
vfs_iter_write.  Additionally it now properly updates timestamps.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2017-05-27 11:16:52 +03:00 committed by Al Viro
parent 18e9710ee5
commit abbb65899a
6 changed files with 16 additions and 26 deletions
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2
drivers/block/loop.c
View file

@ -266,7 +266,7 @@ static int lo_write_bvec(struct file *file, struct bio_vec *bvec, loff_t *ppos)
iov_iter_bvec(&i, ITER_BVEC, bvec, 1, bvec->bv_len);
file_start_write(file);
bw = vfs_iter_write(file, &i, ppos);
bw = vfs_iter_write(file, &i, ppos, 0);
file_end_write(file);
if (likely(bw == bvec->bv_len))

4
drivers/target/target_core_file.c
View file

@ -273,7 +273,7 @@ static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
if (is_write)
ret = vfs_iter_write(fd, &iter, &pos);
ret = vfs_iter_write(fd, &iter, &pos, 0);
else
ret = vfs_iter_read(fd, &iter, &pos, 0);
@ -409,7 +409,7 @@ fd_execute_write_same(struct se_cmd *cmd)
}
iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0);
kfree(bvec);
if (ret < 0 || ret != len) {

2
fs/coda/file.c
View file

@ -51,7 +51,7 @@ coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
host_file = cfi->cfi_container;
file_start_write(host_file);
inode_lock(coda_inode);
ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos);
ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
coda_inode->i_size = file_inode(host_file)->i_size;
coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);

29
fs/read_write.c
View file

@ -356,26 +356,6 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
}
#endif
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos)
{
struct kiocb kiocb;
ssize_t ret;
if (!file->f_op->write_iter)
return -EINVAL;
init_sync_kiocb(&kiocb, file);
kiocb.ki_pos = *ppos;
iter->type |= WRITE;
ret = call_write_iter(file, &kiocb, iter);
BUG_ON(ret == -EIOCBQUEUED);
if (ret > 0)
*ppos = kiocb.ki_pos;
return ret;
}
EXPORT_SYMBOL(vfs_iter_write);
int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count)
{
struct inode *inode;
@ -962,6 +942,15 @@ static ssize_t do_iter_write(struct file *file, struct iov_iter *iter,
return ret;
}
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
int flags)
{
if (!file->f_op->write_iter)
return -EINVAL;
return do_iter_write(file, iter, ppos, flags);
}
EXPORT_SYMBOL(vfs_iter_write);
ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
unsigned long vlen, loff_t *pos, int flags)
{

2
fs/splice.c
View file

@ -762,7 +762,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
iov_iter_bvec(&from, ITER_BVEC | WRITE, array, n,
sd.total_len - left);
ret = vfs_iter_write(out, &from, &sd.pos);
ret = vfs_iter_write(out, &from, &sd.pos, 0);
if (ret <= 0)
break;

3
include/linux/fs.h
View file

@ -2791,7 +2791,8 @@ extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
int flags);
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos);
ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
int flags);
/* fs/block_dev.c */
extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);