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Date: Sat, 28 Apr 2012 11:39:04 +0800
From: Zheng Liu <gnehzuil.liu@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Zheng Liu <wenqing.lz@...bao.com>
Subject: [RFC][PATCH 1/3] ext4: split ext4_file_write into buffered IO and direct IO
From: Zheng Liu <wenqing.lz@...bao.com>
ext4_file_buffered/direct_write are defined in order to split buffered IO and
direct IO in ext4. This patch just refactor some stuff in write path.
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
fs/ext4/file.c | 66 +++++++++++++++++++++++++++++++++++++------------------
1 files changed, 44 insertions(+), 22 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index cb70f18..e5d6be3 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -89,12 +89,51 @@ ext4_unaligned_aio(struct inode *inode, const struct iovec *iov,
return 0;
}
+static inline ssize_t
+ext4_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ return generic_file_aio_write(iocb, iov, nr_segs, pos);
+}
+
+static ssize_t
+ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
+ int unaligned_aio = 0;
+ ssize_t ret;
+
+ if (!is_sync_kiocb(iocb))
+ unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
+
+ /* Unaligned direct AIO must be serialized; see comment above */
+ if (unaligned_aio) {
+ static unsigned long unaligned_warn_time;
+
+ /* Warn about this once per day */
+ if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ))
+ ext4_msg(inode->i_sb, KERN_WARNING,
+ "Unaligned AIO/DIO on inode %ld by %s; "
+ "performance will be poor.",
+ inode->i_ino, current->comm);
+ mutex_lock(ext4_aio_mutex(inode));
+ ext4_aiodio_wait(inode);
+ }
+
+ ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
+
+ if (unaligned_aio)
+ mutex_unlock(ext4_aio_mutex(inode));
+
+ return ret;
+}
+
static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
- int unaligned_aio = 0;
int ret;
/*
@@ -114,29 +153,12 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
sbi->s_bitmap_maxbytes - pos);
}
- } else if (unlikely((iocb->ki_filp->f_flags & O_DIRECT) &&
- !is_sync_kiocb(iocb))) {
- unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
- }
-
- /* Unaligned direct AIO must be serialized; see comment above */
- if (unaligned_aio) {
- static unsigned long unaligned_warn_time;
-
- /* Warn about this once per day */
- if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ))
- ext4_msg(inode->i_sb, KERN_WARNING,
- "Unaligned AIO/DIO on inode %ld by %s; "
- "performance will be poor.",
- inode->i_ino, current->comm);
- mutex_lock(ext4_aio_mutex(inode));
- ext4_aiodio_wait(inode);
}
- ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
-
- if (unaligned_aio)
- mutex_unlock(ext4_aio_mutex(inode));
+ if (unlikely(iocb->ki_filp->f_flags & O_DIRECT))
+ ret = ext4_file_dio_write(iocb, iov, nr_segs, pos);
+ else
+ ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
return ret;
}
--
1.7.1
--
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