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new methods: ->read_iter() and ->write_iter()

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Beginning to introduce those.  Just the callers for now, and it's
clumsier than it'll eventually become; once we finish converting
aio_read and aio_write instances, the things will get nicer.

For now, these guys are in parallel to ->aio_read() and ->aio_write();
they take iocb and iov_iter, with everything in iov_iter already
validated.  File offset is passed in iocb->ki_pos, iov/nr_segs -
in iov_iter.

Main concerns in that series are stack footprint and ability to
split the damn thing cleanly.

[fix from Peter Ujfalusi <peter.ujfalusi@ti.com> folded]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2014-02-11 18:37:41 -05:00
parent 7f7f25e82d
commit 293bc9822f
7 changed files with 121 additions and 13 deletions
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6
fs/file_table.c
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@@ -175,9 +175,11 @@ struct file *alloc_file(struct path *path, fmode_t mode,
file->f_path = *path;
file->f_inode = path->dentry->d_inode;
file->f_mapping = path->dentry->d_inode->i_mapping;
if ((mode & FMODE_READ) && likely(fop->read || fop->aio_read))
if ((mode & FMODE_READ) &&
likely(fop->read || fop->aio_read || fop->read_iter))
mode |= FMODE_CAN_READ;
if ((mode & FMODE_WRITE) && likely(fop->write || fop->aio_write))
if ((mode & FMODE_WRITE) &&
likely(fop->write || fop->aio_write || fop->write_iter))
mode |= FMODE_CAN_WRITE;
file->f_mode = mode;
file->f_op = fop;