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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/drivers/md/dm-zero.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/drivers/md/dm-zero.c')
-rw-r--r--ANDROID_3.4.5/drivers/md/dm-zero.c85
1 files changed, 0 insertions, 85 deletions
diff --git a/ANDROID_3.4.5/drivers/md/dm-zero.c b/ANDROID_3.4.5/drivers/md/dm-zero.c
deleted file mode 100644
index cc2b3cb8..00000000
--- a/ANDROID_3.4.5/drivers/md/dm-zero.c
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * Copyright (C) 2003 Christophe Saout <christophe@saout.de>
- *
- * This file is released under the GPL.
- */
-
-#include <linux/device-mapper.h>
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/bio.h>
-
-#define DM_MSG_PREFIX "zero"
-
-/*
- * Construct a dummy mapping that only returns zeros
- */
-static int zero_ctr(struct dm_target *ti, unsigned int argc, char **argv)
-{
- if (argc != 0) {
- ti->error = "No arguments required";
- return -EINVAL;
- }
-
- /*
- * Silently drop discards, avoiding -EOPNOTSUPP.
- */
- ti->num_discard_requests = 1;
-
- return 0;
-}
-
-/*
- * Return zeros only on reads
- */
-static int zero_map(struct dm_target *ti, struct bio *bio,
- union map_info *map_context)
-{
- switch(bio_rw(bio)) {
- case READ:
- zero_fill_bio(bio);
- break;
- case READA:
- /* readahead of null bytes only wastes buffer cache */
- return -EIO;
- case WRITE:
- /* writes get silently dropped */
- break;
- }
-
- bio_endio(bio, 0);
-
- /* accepted bio, don't make new request */
- return DM_MAPIO_SUBMITTED;
-}
-
-static struct target_type zero_target = {
- .name = "zero",
- .version = {1, 0, 0},
- .module = THIS_MODULE,
- .ctr = zero_ctr,
- .map = zero_map,
-};
-
-static int __init dm_zero_init(void)
-{
- int r = dm_register_target(&zero_target);
-
- if (r < 0)
- DMERR("register failed %d", r);
-
- return r;
-}
-
-static void __exit dm_zero_exit(void)
-{
- dm_unregister_target(&zero_target);
-}
-
-module_init(dm_zero_init)
-module_exit(dm_zero_exit)
-
-MODULE_AUTHOR("Christophe Saout <christophe@saout.de>");
-MODULE_DESCRIPTION(DM_NAME " dummy target returning zeros");
-MODULE_LICENSE("GPL");