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Staging: zram: initialize device on first read 

Currently the device is initialized when first write is done to the
device. Any read attempt before the first write would fail, including
"hidden" read the user may not know about (as for example if he tries
to write a partial block).

This patch initializes the device on first request, whether read or
write.

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jerome Marchand 2011-02-17 17:11:49 +01:00 committed by Greg Kroah-Hartman
parent 69648bed53
commit 6642a67c55
1 changed files with 7 additions and 12 deletions
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19
drivers/staging/zram/zram_drv.c
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@ -211,11 +211,6 @@ static void zram_read(struct zram *zram, struct bio *bio)
u32 index;
struct bio_vec *bvec;
if (unlikely(!zram->init_done)) {
bio_endio(bio, -ENXIO);
return;
}
zram_stat64_inc(zram, &zram->stats.num_reads);
index = bio->bi_sector >> SECTORS_PER_PAGE_SHIFT;
@ -286,20 +281,15 @@ out:
static void zram_write(struct zram *zram, struct bio *bio)
{
int i, ret;
int i;
u32 index;
struct bio_vec *bvec;
if (unlikely(!zram->init_done)) {
ret = zram_init_device(zram);
if (ret)
goto out;
}
zram_stat64_inc(zram, &zram->stats.num_writes);
index = bio->bi_sector >> SECTORS_PER_PAGE_SHIFT;
bio_for_each_segment(bvec, bio, i) {
int ret;
u32 offset;
size_t clen;
struct zobj_header *zheader;
@ -445,6 +435,11 @@ static int zram_make_request(struct request_queue *queue, struct bio *bio)
return 0;
}
if (unlikely(!zram->init_done) && zram_init_device(zram)) {
bio_io_error(bio);
return 0;
}
switch (bio_data_dir(bio)) {
case READ:
zram_read(zram, bio);