luck/tmp_suning_uos_patched
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block: factor our bio_check_eod()

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End of device check is done twice in __generic_make_request() and it's
fully inlined each time.  Factor out bio_check_eod().

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-07-18 13:27:58 +02:00
parent a0cd128542
commit c07e2b4129
1 changed files with 33 additions and 30 deletions
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63
block/ll_rw_blk.c
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@ -3120,6 +3120,35 @@ static inline int should_fail_request(struct bio *bio)
#endif /* CONFIG_FAIL_MAKE_REQUEST */
/*
* Check whether this bio extends beyond the end of the device.
*/
static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors)
{
sector_t maxsector;
if (!nr_sectors)
return 0;
/* Test device or partition size, when known. */
maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
if (maxsector) {
sector_t sector = bio->bi_sector;
if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {
/*
* This may well happen - the kernel calls bread()
* without checking the size of the device, e.g., when
* mounting a device.
*/
handle_bad_sector(bio);
return 1;
}
}
return 0;
}
/**
* generic_make_request: hand a buffer to its device driver for I/O
* @bio: The bio describing the location in memory and on the device.
@ -3147,27 +3176,14 @@ static inline int should_fail_request(struct bio *bio)
static inline void __generic_make_request(struct bio *bio)
{
struct request_queue *q;
sector_t maxsector;
sector_t old_sector;
int ret, nr_sectors = bio_sectors(bio);
dev_t old_dev;
might_sleep();
/* Test device or partition size, when known. */
maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
if (maxsector) {
sector_t sector = bio->bi_sector;
if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {
/*
* This may well happen - the kernel calls bread()
* without checking the size of the device, e.g., when
* mounting a device.
*/
handle_bad_sector(bio);
goto end_io;
}
}
if (bio_check_eod(bio, nr_sectors))
goto end_io;
/*
* Resolve the mapping until finished. (drivers are
@ -3223,21 +3239,8 @@ static inline void __generic_make_request(struct bio *bio)
old_sector = bio->bi_sector;
old_dev = bio->bi_bdev->bd_dev;
maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
if (maxsector) {
sector_t sector = bio->bi_sector;
if (maxsector < nr_sectors ||
maxsector - nr_sectors < sector) {
/*
* This may well happen - partitions are not
* checked to make sure they are within the size
* of the whole device.
*/
handle_bad_sector(bio);
goto end_io;
}
}
if (bio_check_eod(bio, nr_sectors))
goto end_io;
ret = q->make_request_fn(q, bio);
} while (ret);