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splice: implement default splice_read method

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If f_op->splice_read() is not implemented, fall back to a plain read.
Use vfs_readv() to read into previously allocated pages.

This will allow splice and functions using splice, such as the loop
device, to work on all filesystems.  This includes "direct_io" files
in fuse which bypass the page cache.

Signed-off-by: Miklos Szeredi <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Miklos Szeredi 2009-05-07 15:37:36 +02:00 • committed by Jens Axboe
commit 6818173bd6
7 changed files with 140 additions and 24 deletions
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11
drivers/block/loop.c
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@ -709,10 +709,6 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
if (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))
goto out_putf;
/* new backing store needs to support loop (eg splice_read) */
if (!inode->i_fop->splice_read)
goto out_putf;
/* size of the new backing store needs to be the same */
if (get_loop_size(lo, file) != get_loop_size(lo, old_file))
goto out_putf;
@ -788,12 +784,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
error = -EINVAL;
if (S_ISREG(inode->i_mode) || S_ISBLK(inode->i_mode)) {
const struct address_space_operations *aops = mapping->a_ops;
/*
* If we can't read - sorry. If we only can't write - well,
* it's going to be read-only.
*/
if (!file->f_op->splice_read)
goto out_putf;
if (aops->write_begin)
lo_flags |= LO_FLAGS_USE_AOPS;
if (!(lo_flags & LO_FLAGS_USE_AOPS) && !file->f_op->write)