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Message-Id: <1350918922-6096-20-git-send-email-dave.kleikamp@oracle.com>
Date: Mon, 22 Oct 2012 10:15:19 -0500
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>,
"Theodore Ts'o" <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
linux-ext4@...r.kernel.org
Subject: [PATCH 19/22] ext4: add support for read_iter and write_iter
use the generic_file_read_iter(), create ext4_file_write_iter() based on
ext4_file_write(), and make ext4_file_write() a wrapper around
ext4_file_write_iter().
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Cc: Zach Brown <zab@...bo.net>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>
Cc: linux-ext4@...r.kernel.org
---
fs/ext4/file.c | 49 ++++++++++++++++++++++++++++++++++---------------
1 file changed, 34 insertions(+), 15 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index bf3966b..4a49e91 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -72,12 +72,11 @@ void ext4_unwritten_wait(struct inode *inode)
* or one thread will zero the other's data, causing corruption.
*/
static int
-ext4_unaligned_aio(struct inode *inode, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+ext4_unaligned_aio(struct inode *inode, struct iov_iter *iter, loff_t pos)
{
struct super_block *sb = inode->i_sb;
int blockmask = sb->s_blocksize - 1;
- size_t count = iov_length(iov, nr_segs);
+ size_t count = iov_iter_count(iter);
loff_t final_size = pos + count;
if (pos >= inode->i_size)
@@ -90,8 +89,8 @@ ext4_unaligned_aio(struct inode *inode, const struct iovec *iov,
}
static ssize_t
-ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+ext4_file_dio_write(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
@@ -99,11 +98,11 @@ ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
int unaligned_aio = 0;
ssize_t ret;
int overwrite = 0;
- size_t length = iov_length(iov, nr_segs);
+ size_t length = iov_iter_count(iter);
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
!is_sync_kiocb(iocb))
- unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
+ unaligned_aio = ext4_unaligned_aio(inode, iter, pos);
/* Unaligned direct AIO must be serialized; see comment above */
if (unaligned_aio) {
@@ -152,7 +151,7 @@ ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
overwrite = 1;
}
- ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
+ ret = __generic_file_write_iter(iocb, iter, &iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
if (ret > 0 || ret == -EIOCBQUEUED) {
@@ -171,8 +170,7 @@ ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
}
static ssize_t
-ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *iter, loff_t pos)
{
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
ssize_t ret;
@@ -184,26 +182,45 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
- size_t length = iov_length(iov, nr_segs);
+ size_t length = iov_iter_count(iter);
if ((pos > sbi->s_bitmap_maxbytes ||
(pos == sbi->s_bitmap_maxbytes && length > 0)))
return -EFBIG;
if (pos + length > sbi->s_bitmap_maxbytes) {
- nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
- sbi->s_bitmap_maxbytes - pos);
+ ret = iov_iter_shorten(iter,
+ sbi->s_bitmap_maxbytes - pos);
+ if (ret)
+ return ret;
}
}
if (unlikely(iocb->ki_filp->f_flags & O_DIRECT))
- ret = ext4_file_dio_write(iocb, iov, nr_segs, pos);
+ ret = ext4_file_dio_write(iocb, iter, pos);
else
- ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
+ ret = generic_file_write_iter(iocb, iter, pos);
return ret;
}
+static ssize_t
+ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct iov_iter i;
+ int ret;
+ size_t count;
+
+ ret = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
+ if (ret)
+ return ret;
+
+ iov_iter_init(&i, iov, nr_segs, count, 0);
+
+ return ext4_file_write_iter(iocb, &i, pos);
+}
+
static const struct vm_operations_struct ext4_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = ext4_page_mkwrite,
@@ -310,6 +327,8 @@ const struct file_operations ext4_file_operations = {
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = ext4_file_write,
+ .read_iter = generic_file_read_iter,
+ .write_iter = ext4_file_write_iter,
.unlocked_ioctl = ext4_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext4_compat_ioctl,
--
1.7.12.3
--
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