From 6642a67c552e6d525913bb5fb4a00b2008213451 Mon Sep 17 00:00:00 2001 From: Jerome Marchand Date: Thu, 17 Feb 2011 17:11:49 +0100 Subject: [PATCH] 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 Cc: Nitin Gupta Signed-off-by: Greg Kroah-Hartman --- drivers/staging/zram/zram_drv.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 5fdf9d2fc950..aab4ec482124 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -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 @@ static void zram_read(struct zram *zram, struct bio *bio) 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);