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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>
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69648bed53
commit
6642a67c55
1 changed files with 7 additions and 12 deletions
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@ -211,11 +211,6 @@ static void zram_read(struct zram *zram, struct bio *bio)
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u32 index;
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u32 index;
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struct bio_vec *bvec;
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struct bio_vec *bvec;
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if (unlikely(!zram->init_done)) {
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bio_endio(bio, -ENXIO);
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return;
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}
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zram_stat64_inc(zram, &zram->stats.num_reads);
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zram_stat64_inc(zram, &zram->stats.num_reads);
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index = bio->bi_sector >> SECTORS_PER_PAGE_SHIFT;
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index = bio->bi_sector >> SECTORS_PER_PAGE_SHIFT;
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@ -286,20 +281,15 @@ static void zram_read(struct zram *zram, struct bio *bio)
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static void zram_write(struct zram *zram, struct bio *bio)
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static void zram_write(struct zram *zram, struct bio *bio)
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{
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{
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int i, ret;
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int i;
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u32 index;
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u32 index;
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struct bio_vec *bvec;
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struct bio_vec *bvec;
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if (unlikely(!zram->init_done)) {
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ret = zram_init_device(zram);
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if (ret)
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goto out;
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}
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zram_stat64_inc(zram, &zram->stats.num_writes);
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zram_stat64_inc(zram, &zram->stats.num_writes);
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index = bio->bi_sector >> SECTORS_PER_PAGE_SHIFT;
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index = bio->bi_sector >> SECTORS_PER_PAGE_SHIFT;
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bio_for_each_segment(bvec, bio, i) {
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bio_for_each_segment(bvec, bio, i) {
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int ret;
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u32 offset;
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u32 offset;
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size_t clen;
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size_t clen;
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struct zobj_header *zheader;
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struct zobj_header *zheader;
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@ -445,6 +435,11 @@ static int zram_make_request(struct request_queue *queue, struct bio *bio)
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return 0;
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return 0;
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}
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}
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if (unlikely(!zram->init_done) && zram_init_device(zram)) {
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bio_io_error(bio);
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return 0;
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}
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switch (bio_data_dir(bio)) {
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switch (bio_data_dir(bio)) {
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case READ:
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case READ:
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zram_read(zram, bio);
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zram_read(zram, bio);
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