From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
These patches adds the `-o sync' and `-o dirsync' supports to fatfs. If user
specified that option, the fatfs does traditional ordered updates by using
synchronous writes. If compared to before, these patches will show a
improvement of robustness I think.
`-o sync' - writes all buffers out before returning from syscall.
`-o dirsync' - writes the directory's metadata, and unreferencing
operations of data block.
remaining to be done
fat_generic_ioctl(), fat_notify_change(),
ATTR_ARCH of fat_xxx_write[v],
and probably, filling hole in cont_prepare_write(),
NOTE: Since fatfs doesn't have link-count, unfortunately ->rename() is
not safe order at all. It may make the shared blocks, but user
shouldn't lose the data by ->rename().
If you test this, please use the dosfstools at
http://www.zip.com.au/~akpm/linux/patches/stuff/fatfsprogs.tar.bz2
This is fixing several bugs of dosfstools. And "2/29" patch from hpa adds new
ioctl, the attached archive is also including the commands for testing it.
This patch fixes vectored write support on fat to do the nessecary
non-standard action done in write() aswell.
Also adds aio support and makes read/write wrappers around the aio
version.
From: Christoph Hellwig <hch@lst.de>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/fs/fat/file.c | 31 ++++++++++++++++++++++++-------
1 files changed, 24 insertions(+), 7 deletions(-)
diff -puN fs/fat/file.c~fat-fix-writev-add-aio-support fs/fat/file.c
--- 25/fs/fat/file.c~fat-fix-writev-add-aio-support Sun Mar 6 17:13:04 2005
+++ 25-akpm/fs/fat/file.c Sun Mar 6 17:13:04 2005
@@ -12,13 +12,28 @@
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
-static ssize_t fat_file_write(struct file *filp, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t fat_file_aio_write(struct kiocb *iocb, const char __user *buf,
+ size_t count, loff_t pos)
+{
+ struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
+ int retval;
+
+ retval = generic_file_aio_write(iocb, buf, count, pos);
+ if (retval > 0) {
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+ MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+ mark_inode_dirty(inode);
+ }
+ return retval;
+}
+
+static ssize_t fat_file_writev(struct file *filp, const struct iovec *iov,
+ unsigned long nr_segs, loff_t *ppos)
{
struct inode *inode = filp->f_dentry->d_inode;
int retval;
- retval = generic_file_write(filp, buf, count, ppos);
+ retval = generic_file_writev(filp, iov, nr_segs, ppos);
if (retval > 0) {
inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
@@ -29,12 +44,14 @@ static ssize_t fat_file_write(struct fil
struct file_operations fat_file_operations = {
.llseek = generic_file_llseek,
- .read = generic_file_read,
- .write = fat_file_write,
+ .read = do_sync_read,
+ .write = do_sync_write,
+ .readv = generic_file_readv,
+ .writev = fat_file_writev,
+ .aio_read = generic_file_aio_read,
+ .aio_write = fat_file_aio_write,
.mmap = generic_file_mmap,
.fsync = file_fsync,
- .readv = generic_file_readv,
- .writev = generic_file_writev,
.sendfile = generic_file_sendfile,
};
_