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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-17 15:48:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-17 15:48:33 -0800 |
| commit | 66dc830d14a222c9214a8557e9feb1e4a67a3857 (patch) | |
| tree | d5bd699150fecfe5b2ebfddd9db651389480937d /fs/read_write.c | |
| parent | 05016b0f0a9d900e976db7f50a7761c0aefe5a1c (diff) | |
| parent | dbe4e192a234cd6133d86fffb965d0f032c12ccc (diff) | |
| download | linux-stable-66dc830d14a222c9214a8557e9feb1e4a67a3857.tar.gz linux-stable-66dc830d14a222c9214a8557e9feb1e4a67a3857.tar.bz2 linux-stable-66dc830d14a222c9214a8557e9feb1e4a67a3857.zip | |
Merge branch 'iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull iov_iter updates from Al Viro:
"More iov_iter work - missing counterpart of iov_iter_init() for
bvec-backed ones and vfs_read_iter()/vfs_write_iter() - wrappers for
sync calls of ->read_iter()/->write_iter()"
* 'iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
fs: add vfs_iter_{read,write} helpers
new helper: iov_iter_bvec()
Diffstat (limited to 'fs/read_write.c')
| -rw-r--r-- | fs/read_write.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 4060691e78f7..8e1b68786d66 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -333,6 +333,52 @@ out_putf: } #endif +ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos) +{ + struct kiocb kiocb; + ssize_t ret; + + if (!file->f_op->read_iter) + return -EINVAL; + + init_sync_kiocb(&kiocb, file); + kiocb.ki_pos = *ppos; + kiocb.ki_nbytes = iov_iter_count(iter); + + iter->type |= READ; + ret = file->f_op->read_iter(&kiocb, iter); + if (ret == -EIOCBQUEUED) + ret = wait_on_sync_kiocb(&kiocb); + + if (ret > 0) + *ppos = kiocb.ki_pos; + return ret; +} +EXPORT_SYMBOL(vfs_iter_read); + +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; + kiocb.ki_nbytes = iov_iter_count(iter); + + iter->type |= WRITE; + ret = file->f_op->write_iter(&kiocb, iter); + if (ret == -EIOCBQUEUED) + ret = wait_on_sync_kiocb(&kiocb); + + if (ret > 0) + *ppos = kiocb.ki_pos; + return ret; +} +EXPORT_SYMBOL(vfs_iter_write); + /* * rw_verify_area doesn't like huge counts. We limit * them to something that fits in "int" so that others |