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Date: Wed, 21 Nov 2012 16:40:58 -0600
From: Dave Kleikamp <dave.kleikamp@...cle.com>
To: linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Zach Brown <zab@...bo.net>,
"Maxim V. Patlasov" <mpatlasov@...allels.com>,
Dave Kleikamp <dave.kleikamp@...cle.com>,
Alexander Viro <viro@...iv.linux.org.uk>
Subject: [PATCH v4 18/31] fs: use read_iter and write_iter rather than aio_read and aio_write
File systems implementing read_iter & write_iter should not be required
to keep aio_read and aio_write as well. The vfs should always call
read/write_iter if they exist. This will make it easier to remove the
aio_read/write operation in the future.
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
---
fs/aio.c | 14 +++++++------
fs/bad_inode.c | 14 +++++++++++++
fs/compat.c | 6 ++++--
fs/read_write.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++-----
fs/read_write.h | 4 ++++
include/linux/fs.h | 6 ++++--
6 files changed, 87 insertions(+), 15 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index 2c03681..08f550a 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -39,6 +39,8 @@
#include <asm/kmap_types.h>
#include <asm/uaccess.h>
+#include "read_write.h"
+
#if DEBUG > 1
#define dprintk printk
#else
@@ -1315,10 +1317,10 @@ static ssize_t aio_rw_vect_retry(struct kiocb *iocb)
if ((iocb->ki_opcode == IOCB_CMD_PREADV) ||
(iocb->ki_opcode == IOCB_CMD_PREAD)) {
- rw_op = file->f_op->aio_read;
+ rw_op = do_aio_read;
opcode = IOCB_CMD_PREADV;
} else {
- rw_op = file->f_op->aio_write;
+ rw_op = do_aio_read;
opcode = IOCB_CMD_PWRITEV;
}
@@ -1467,7 +1469,7 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat)
if (ret)
break;
ret = -EINVAL;
- if (file->f_op->aio_read)
+ if (file->f_op->read_iter || file->f_op->aio_read)
kiocb->ki_retry = aio_rw_vect_retry;
break;
case IOCB_CMD_PWRITE:
@@ -1482,7 +1484,7 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat)
if (ret)
break;
ret = -EINVAL;
- if (file->f_op->aio_write)
+ if (file->f_op->write_iter || file->f_op->aio_write)
kiocb->ki_retry = aio_rw_vect_retry;
break;
case IOCB_CMD_PREADV:
@@ -1493,7 +1495,7 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat)
if (ret)
break;
ret = -EINVAL;
- if (file->f_op->aio_read)
+ if (file->f_op->read_iter || file->f_op->aio_read)
kiocb->ki_retry = aio_rw_vect_retry;
break;
case IOCB_CMD_PWRITEV:
@@ -1504,7 +1506,7 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat)
if (ret)
break;
ret = -EINVAL;
- if (file->f_op->aio_write)
+ if (file->f_op->write_iter || file->f_op->aio_write)
kiocb->ki_retry = aio_rw_vect_retry;
break;
case IOCB_CMD_READ_ITER:
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index b1342ff..aeee3d5 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -39,12 +39,24 @@ static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
return -EIO;
}
+static ssize_t bad_file_read_iter(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos)
+{
+ return -EIO;
+}
+
static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
return -EIO;
}
+static ssize_t bad_file_write_iter(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos)
+{
+ return -EIO;
+}
+
static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
return -EIO;
@@ -151,7 +163,9 @@ static const struct file_operations bad_file_ops =
.read = bad_file_read,
.write = bad_file_write,
.aio_read = bad_file_aio_read,
+ .read_iter = bad_file_read_iter,
.aio_write = bad_file_aio_write,
+ .write_iter = bad_file_write_iter,
.readdir = bad_file_readdir,
.poll = bad_file_poll,
.unlocked_ioctl = bad_file_unlocked_ioctl,
diff --git a/fs/compat.c b/fs/compat.c
index 7411d66..545888b 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1098,10 +1098,12 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
fnv = NULL;
if (type == READ) {
fn = file->f_op->read;
- fnv = file->f_op->aio_read;
+ if (file->f_op->aio_read || file->f_op->read_iter)
+ fnv = do_aio_read;
} else {
fn = (io_fn_t)file->f_op->write;
- fnv = file->f_op->aio_write;
+ if (file->f_op->aio_write || file->f_op->write_iter)
+ fnv = do_aio_write;
}
if (fnv)
diff --git a/fs/read_write.c b/fs/read_write.c
index 266e172..44d5e9c 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -23,7 +23,7 @@
const struct file_operations generic_ro_fops = {
.llseek = generic_file_llseek,
.read = do_sync_read,
- .aio_read = generic_file_aio_read,
+ .read_iter = generic_file_read_iter,
.mmap = generic_file_readonly_mmap,
.splice_read = generic_file_splice_read,
};
@@ -328,6 +328,29 @@ static void wait_on_retry_sync_kiocb(struct kiocb *iocb)
__set_current_state(TASK_RUNNING);
}
+ssize_t do_aio_read(struct kiocb *kiocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct file *file = kiocb->ki_filp;
+
+ if (file->f_op->read_iter) {
+ size_t count;
+ struct iov_iter iter;
+ int ret;
+
+ count = 0;
+ ret = generic_segment_checks(iov, &nr_segs, &count,
+ VERIFY_WRITE);
+ if (ret)
+ return ret;
+
+ iov_iter_init(&iter, iov, nr_segs, count, 0);
+ return file->f_op->read_iter(kiocb, &iter, pos);
+ }
+
+ return file->f_op->aio_read(kiocb, iov, nr_segs, pos);
+}
+
ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
{
struct iovec iov = { .iov_base = buf, .iov_len = len };
@@ -340,7 +363,7 @@ ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *pp
kiocb.ki_nbytes = len;
for (;;) {
- ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
+ ret = do_aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
if (ret != -EIOCBRETRY)
break;
wait_on_retry_sync_kiocb(&kiocb);
@@ -384,6 +407,29 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
EXPORT_SYMBOL(vfs_read);
+ssize_t do_aio_write(struct kiocb *kiocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct file *file = kiocb->ki_filp;
+
+ if (file->f_op->write_iter) {
+ size_t count;
+ struct iov_iter iter;
+ int ret;
+
+ count = 0;
+ ret = generic_segment_checks(iov, &nr_segs, &count,
+ VERIFY_READ);
+ if (ret)
+ return ret;
+
+ iov_iter_init(&iter, iov, nr_segs, count, 0);
+ return file->f_op->write_iter(kiocb, &iter, pos);
+ }
+
+ return file->f_op->aio_write(kiocb, iov, nr_segs, pos);
+}
+
ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
{
struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
@@ -396,7 +442,7 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
kiocb.ki_nbytes = len;
for (;;) {
- ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
+ ret = do_aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
if (ret != -EIOCBRETRY)
break;
wait_on_retry_sync_kiocb(&kiocb);
@@ -720,10 +766,12 @@ static ssize_t do_readv_writev(int type, struct file *file,
fnv = NULL;
if (type == READ) {
fn = file->f_op->read;
- fnv = file->f_op->aio_read;
+ if (file->f_op->aio_read || file->f_op->read_iter)
+ fnv = do_aio_read;
} else {
fn = (io_fn_t)file->f_op->write;
- fnv = file->f_op->aio_write;
+ if (file->f_op->aio_write || file->f_op->write_iter)
+ fnv = do_aio_write;
}
if (fnv)
diff --git a/fs/read_write.h b/fs/read_write.h
index d3e00ef..4f00eb7 100644
--- a/fs/read_write.h
+++ b/fs/read_write.h
@@ -8,6 +8,10 @@ typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *);
typedef ssize_t (*iov_fn_t)(struct kiocb *, const struct iovec *,
unsigned long, loff_t);
+ssize_t do_aio_read(struct kiocb *kiocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos);
+ssize_t do_aio_write(struct kiocb *kiocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos);
ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn);
ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 5871910..e0960bd 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1638,12 +1638,14 @@ struct file_operations {
static inline int file_readable(struct file *filp)
{
- return filp && (filp->f_op->read || filp->f_op->aio_read);
+ return filp && (filp->f_op->read || filp->f_op->aio_read ||
+ filp->f_op->read_iter);
}
static inline int file_writable(struct file *filp)
{
- return filp && (filp->f_op->write || filp->f_op->aio_write);
+ return filp && (filp->f_op->write || filp->f_op->aio_write ||
+ filp->f_op->write_iter);
}
struct inode_operations {
--
1.8.0
--
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