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raw: fsync method is now required 

Commit 148f948ba8 (vfs: Introduce new
helpers for syncing after writing to O_SYNC file or IS_SYNC inode) broke
the raw driver.

We now call through generic_file_aio_write -> generic_write_sync ->
vfs_fsync_range.  vfs_fsync_range has:

        if (!fop || !fop->fsync) {
                ret = -EINVAL;
                goto out;
        }

But drivers/char/raw.c doesn't set an fsync method.

We have two options: fix it or remove the raw driver completely.  I'm
happy to do either, the fact this has been broken for so long suggests it
is rarely used.

The patch below adds an fsync method to the raw driver.  My knowledge of
the block layer is pretty sketchy so this could do with a once over.

If we instead decide to remove the raw driver, this patch might still be
useful as a backport to 2.6.33 and 2.6.32.

Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <jens.axboe@oracle.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Tested-by: Jeff Moyer <jmoyer@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anton Blanchard 2010-04-06 14:34:58 -07:00 committed by Linus Torvalds
parent da25801629
commit 55ab3a1ff8
3 changed files with 4 additions and 1 deletions
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1
drivers/char/raw.c
View File

@ -248,6 +248,7 @@ static const struct file_operations raw_fops = {
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = blkdev_aio_write,
.fsync = block_fsync,
.open = raw_open,
.release= raw_release,
.ioctl = raw_ioctl,

3
fs/block_dev.c
View File

@ -404,7 +404,7 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin)
* NULL first argument is nfsd_sync_dir() and that's not a directory.
*/
static int block_fsync(struct file *filp, struct dentry *dentry, int datasync)
int block_fsync(struct file *filp, struct dentry *dentry, int datasync)
{
struct block_device *bdev = I_BDEV(filp->f_mapping->host);
int error;
@ -418,6 +418,7 @@ static int block_fsync(struct file *filp, struct dentry *dentry, int datasync)
error = 0;
return error;
}
EXPORT_SYMBOL(block_fsync);
/*
* pseudo-fs

1
include/linux/fs.h
View File

@ -2212,6 +2212,7 @@ extern int generic_segment_checks(const struct iovec *iov,
/* fs/block_dev.c */
extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos);
extern int block_fsync(struct file *filp, struct dentry *dentry, int datasync);
/* fs/splice.c */
extern ssize_t generic_file_splice_read(struct file *, loff_t *,