unsigned first_block_in_page; /* doesn't change, Used only once */
int boundary; /* prev block is at a boundary */
int reap_counter; /* rate limit reaping */
- get_block_t *get_block; /* block mapping function */
+ get_blocks_t *get_blocks; /* block mapping function */
dio_iodone_t *end_io; /* IO completion function */
sector_t final_block_in_bio; /* current final block in bio + 1 */
sector_t next_block_for_io; /* next block to be put under IO,
in dio_blocks units */
- struct buffer_head map_bh; /* last get_block() result */
+ struct buffer_head map_bh; /* last get_blocks() result */
/*
* Deferred addition of a page to the dio. These variables are
/* AIO related stuff */
struct kiocb *iocb; /* kiocb */
int is_async; /* is IO async ? */
- int io_error; /* IO error in completion path */
ssize_t result; /* IO result */
};
/*
* Called when all DIO BIO I/O has been completed - let the filesystem
- * know, if it registered an interest earlier via get_block. Pass the
+ * know, if it registered an interest earlier via get_blocks. Pass the
* private field of the map buffer_head so that filesystems can use it
- * to hold additional state between get_block calls and dio_complete.
+ * to hold additional state between get_blocks calls and dio_complete.
*/
static void dio_complete(struct dio *dio, loff_t offset, ssize_t bytes)
{
((offset + transferred) > dio->i_size))
transferred = dio->i_size - offset;
- /* check for error in completion path */
- if (dio->io_error)
- transferred = dio->io_error;
-
dio_complete(dio, offset, transferred);
/* Complete AIO later if falling back to buffered i/o */
int page_no;
if (!uptodate)
- dio->io_error = -EIO;
+ dio->result = -EIO;
if (dio->is_async && dio->rw == READ) {
bio_check_pages_dirty(bio); /* transfers ownership */
* The fs is allowed to map lots of blocks at once. If it wants to do that,
* it uses the passed inode-relative block number as the file offset, as usual.
*
- * get_block() is passed the number of i_blkbits-sized blocks which direct_io
+ * get_blocks() is passed the number of i_blkbits-sized blocks which direct_io
* has remaining to do. The fs should not map more than this number of blocks.
*
* If the fs has mapped a lot of blocks, it should populate bh->b_size to
* In the case of filesystem holes: the fs may return an arbitrarily-large
* hole by returning an appropriate value in b_size and by clearing
* buffer_mapped(). However the direct-io code will only process holes one
- * block at a time - it will repeatedly call get_block() as it walks the hole.
+ * block at a time - it will repeatedly call get_blocks() as it walks the hole.
*/
static int get_more_blocks(struct dio *dio)
{
*/
ret = dio->page_errors;
if (ret == 0) {
+ map_bh->b_state = 0;
+ map_bh->b_size = 0;
BUG_ON(dio->block_in_file >= dio->final_block_in_request);
fs_startblk = dio->block_in_file >> dio->blkfactor;
dio_count = dio->final_block_in_request - dio->block_in_file;
if (dio_count & blkmask)
fs_count++;
- map_bh->b_state = 0;
- map_bh->b_size = fs_count << dio->inode->i_blkbits;
-
create = dio->rw == WRITE;
if (dio->lock_type == DIO_LOCKING) {
if (dio->block_in_file < (i_size_read(dio->inode) >>
} else if (dio->lock_type == DIO_NO_LOCKING) {
create = 0;
}
-
/*
* For writes inside i_size we forbid block creations: only
* overwrites are permitted. We fall back to buffered writes
* at a higher level for inside-i_size block-instantiating
* writes.
*/
- ret = (*dio->get_block)(dio->inode, fs_startblk,
+ ret = (*dio->get_blocks)(dio->inode, fs_startblk, fs_count,
map_bh, create);
}
return ret;
* happily perform page-sized but 512-byte aligned IOs. It is important that
* blockdev IO be able to have fine alignment and large sizes.
*
- * So what we do is to permit the ->get_block function to populate bh.b_size
+ * So what we do is to permit the ->get_blocks function to populate bh.b_size
* with the size of IO which is permitted at this offset and this i_blkbits.
*
* For best results, the blockdev should be set up with 512-byte i_blkbits and
- * it should set b_size to PAGE_SIZE or more inside get_block(). This gives
+ * it should set b_size to PAGE_SIZE or more inside get_blocks(). This gives
* fine alignment but still allows this function to work in PAGE_SIZE units.
*/
static int do_direct_IO(struct dio *dio)
block_in_page += this_chunk_blocks;
dio->blocks_available -= this_chunk_blocks;
next_block:
- BUG_ON(dio->block_in_file > dio->final_block_in_request);
+ if (dio->block_in_file > dio->final_block_in_request)
+ BUG();
if (dio->block_in_file == dio->final_block_in_request)
break;
}
static ssize_t
direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
const struct iovec *iov, loff_t offset, unsigned long nr_segs,
- unsigned blkbits, get_block_t get_block, dio_iodone_t end_io,
+ unsigned blkbits, get_blocks_t get_blocks, dio_iodone_t end_io,
struct dio *dio)
{
unsigned long user_addr;
dio->boundary = 0;
dio->reap_counter = 0;
- dio->get_block = get_block;
+ dio->get_blocks = get_blocks;
dio->end_io = end_io;
dio->map_bh.b_private = NULL;
dio->final_block_in_bio = -1;
dio->next_block_for_io = -1;
dio->page_errors = 0;
- dio->io_error = 0;
dio->result = 0;
dio->iocb = iocb;
dio->i_size = i_size_read(inode);
ssize_t
__blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
struct block_device *bdev, const struct iovec *iov, loff_t offset,
- unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
+ unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
int dio_lock_type)
{
int seg;
(end > i_size_read(inode)));
retval = direct_io_worker(rw, iocb, inode, iov, offset,
- nr_segs, blkbits, get_block, end_io, dio);
+ nr_segs, blkbits, get_blocks, end_io, dio);
if (rw == READ && dio_lock_type == DIO_LOCKING)
release_i_mutex = 0;
git://git.onelab.eu / linux-2.6.git / blobdiff