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Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

Browse Source 
* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (34 commits)
  dm table: set flush capability based on underlying devices
  dm crypt: optionally support discard requests
  dm raid: add md raid1 support
  dm raid: support metadata devices
  dm raid: add write_mostly parameter
  dm raid: add region_size parameter
  dm raid: improve table parameters documentation
  dm ioctl: forbid multiple device specifiers
  dm ioctl: introduce __get_dev_cell
  dm ioctl: fill in device parameters in more ioctls
  dm flakey: add corrupt_bio_byte feature
  dm flakey: add drop_writes
  dm flakey: support feature args
  dm flakey: use dm_target_offset and support discards
  dm table: share target argument parsing functions
  dm snapshot: skip reading origin when overwriting complete chunk
  dm: ignore merge_bvec for snapshots when safe
  dm table: clean dm_get_device and move exports
  dm raid: tidy includes
  dm ioctl: prevent empty message
  ...
This commit is contained in:
Linus Torvalds 2011-08-02 20:49:21 -10:00
commit f3406816bb
21 changed files with 1564 additions and 407 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
Documentation/device-mapper/dm-crypt.txt
View File

@ -4,7 +4,8 @@ dm-crypt
Device-Mapper's "crypt" target provides transparent encryption of block devices
using the kernel crypto API.
Parameters: <cipher> <key> <iv_offset> <device path> <offset>
Parameters: <cipher> <key> <iv_offset> <device path> \
<offset> [<#opt_params> <opt_params>]
<cipher>
Encryption cipher and an optional IV generation mode.
@ -37,6 +38,24 @@ Parameters: <cipher> <key> <iv_offset> <device path> <offset>
<offset>
Starting sector within the device where the encrypted data begins.
<#opt_params>
Number of optional parameters. If there are no optional parameters,
the optional paramaters section can be skipped or #opt_params can be zero.
Otherwise #opt_params is the number of following arguments.
Example of optional parameters section:
1 allow_discards
allow_discards
Block discard requests (a.k.a. TRIM) are passed through the crypt device.
The default is to ignore discard requests.
WARNING: Assess the specific security risks carefully before enabling this
option. For example, allowing discards on encrypted devices may lead to
the leak of information about the ciphertext device (filesystem type,
used space etc.) if the discarded blocks can be located easily on the
device later.
Example scripts
===============
LUKS (Linux Unified Key Setup) is now the preferred way to set up disk

48
Documentation/device-mapper/dm-flakey.txt
View File

@ -1,17 +1,53 @@
dm-flakey
=========
This target is the same as the linear target except that it returns I/O
errors periodically. It's been found useful in simulating failing
devices for testing purposes.
This target is the same as the linear target except that it exhibits
unreliable behaviour periodically. It's been found useful in simulating
failing devices for testing purposes.
Starting from the time the table is loaded, the device is available for
<up interval> seconds, then returns errors for <down interval> seconds,
and then this cycle repeats.
<up interval> seconds, then exhibits unreliable behaviour for <down
interval> seconds, and then this cycle repeats.
Parameters: <dev path> <offset> <up interval> <down interval>
Also, consider using this in combination with the dm-delay target too,
which can delay reads and writes and/or send them to different
underlying devices.
Table parameters
----------------
<dev path> <offset> <up interval> <down interval> \
[<num_features> [<feature arguments>]]
Mandatory parameters:
<dev path>: Full pathname to the underlying block-device, or a
"major:minor" device-number.
<offset>: Starting sector within the device.
<up interval>: Number of seconds device is available.
<down interval>: Number of seconds device returns errors.
Optional feature parameters:
If no feature parameters are present, during the periods of
unreliability, all I/O returns errors.
drop_writes:
All write I/O is silently ignored.
Read I/O is handled correctly.
corrupt_bio_byte <Nth_byte> <direction> <value> <flags>:
During <down interval>, replace <Nth_byte> of the data of
each matching bio with <value>.
<Nth_byte>: The offset of the byte to replace.
Counting starts at 1, to replace the first byte.
<direction>: Either 'r' to corrupt reads or 'w' to corrupt writes.
'w' is incompatible with drop_writes.
<value>: The value (from 0-255) to write.
<flags>: Perform the replacement only if bio->bi_rw has all the
selected flags set.
Examples:
corrupt_bio_byte 32 r 1 0
- replaces the 32nd byte of READ bios with the value 1
corrupt_bio_byte 224 w 0 32
- replaces the 224th byte of REQ_META (=32) bios with the value 0

128
Documentation/device-mapper/dm-raid.txt
View File

@ -1,70 +1,108 @@
Device-mapper RAID (dm-raid) is a bridge from DM to MD. It
provides a way to use device-mapper interfaces to access the MD RAID
drivers.
dm-raid
-------
As with all device-mapper targets, the nominal public interfaces are the
constructor (CTR) tables and the status outputs (both STATUSTYPE_INFO
and STATUSTYPE_TABLE). The CTR table looks like the following:
The device-mapper RAID (dm-raid) target provides a bridge from DM to MD.
It allows the MD RAID drivers to be accessed using a device-mapper
interface.
1: <s> <l> raid \
2: <raid_type> <#raid_params> <raid_params> \
3: <#raid_devs> <meta_dev1> <dev1> .. <meta_devN> <devN>
The target is named "raid" and it accepts the following parameters:
Line 1 contains the standard first three arguments to any device-mapper
target - the start, length, and target type fields. The target type in
this case is "raid".
<raid_type> <#raid_params> <raid_params> \
<#raid_devs> <metadata_dev0> <dev0> [.. <metadata_devN> <devN>]
Line 2 contains the arguments that define the particular raid
type/personality/level, the required arguments for that raid type, and
any optional arguments. Possible raid types include: raid4, raid5_la,
raid5_ls, raid5_rs, raid6_zr, raid6_nr, and raid6_nc. (raid1 is
planned for the future.) The list of required and optional parameters
is the same for all the current raid types. The required parameters are
positional, while the optional parameters are given as key/value pairs.
The possible parameters are as follows:
<chunk_size> Chunk size in sectors.
[[no]sync] Force/Prevent RAID initialization
[rebuild <idx>] Rebuild the drive indicated by the index
[daemon_sleep <ms>] Time between bitmap daemon work to clear bits
[min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
[max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
[max_write_behind <sectors>] See '-write-behind=' (man mdadm)
[stripe_cache <sectors>] Stripe cache size for higher RAIDs
<raid_type>:
raid1 RAID1 mirroring
raid4 RAID4 dedicated parity disk
raid5_la RAID5 left asymmetric
- rotating parity 0 with data continuation
raid5_ra RAID5 right asymmetric
- rotating parity N with data continuation
raid5_ls RAID5 left symmetric
- rotating parity 0 with data restart
raid5_rs RAID5 right symmetric
- rotating parity N with data restart
raid6_zr RAID6 zero restart
- rotating parity zero (left-to-right) with data restart
raid6_nr RAID6 N restart
- rotating parity N (right-to-left) with data restart
raid6_nc RAID6 N continue
- rotating parity N (right-to-left) with data continuation
Line 3 contains the list of devices that compose the array in
metadata/data device pairs. If the metadata is stored separately, a '-'
is given for the metadata device position. If a drive has failed or is
missing at creation time, a '-' can be given for both the metadata and
data drives for a given position.
Refererence: Chapter 4 of
http://www.snia.org/sites/default/files/SNIA_DDF_Technical_Position_v2.0.pdf
NB. Currently all metadata devices must be specified as '-'.
<#raid_params>: The number of parameters that follow.
Examples:
# RAID4 - 4 data drives, 1 parity
<raid_params> consists of
Mandatory parameters:
<chunk_size>: Chunk size in sectors. This parameter is often known as
"stripe size". It is the only mandatory parameter and
is placed first.
followed by optional parameters (in any order):
[sync|nosync] Force or prevent RAID initialization.
[rebuild <idx>] Rebuild drive number idx (first drive is 0).
[daemon_sleep <ms>]
Interval between runs of the bitmap daemon that
clear bits. A longer interval means less bitmap I/O but
resyncing after a failure is likely to take longer.
[min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
[max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
[write_mostly <idx>] Drive index is write-mostly
[max_write_behind <sectors>] See '-write-behind=' (man mdadm)
[stripe_cache <sectors>] Stripe cache size (higher RAIDs only)
[region_size <sectors>]
The region_size multiplied by the number of regions is the
logical size of the array. The bitmap records the device
synchronisation state for each region.
<#raid_devs>: The number of devices composing the array.
Each device consists of two entries. The first is the device
containing the metadata (if any); the second is the one containing the
data.
If a drive has failed or is missing at creation time, a '-' can be
given for both the metadata and data drives for a given position.
Example tables
--------------
# RAID4 - 4 data drives, 1 parity (no metadata devices)
# No metadata devices specified to hold superblock/bitmap info
# Chunk size of 1MiB
# (Lines separated for easy reading)
0 1960893648 raid \
raid4 1 2048 \
5 - 8:17 - 8:33 - 8:49 - 8:65 - 8:81
# RAID4 - 4 data drives, 1 parity (no metadata devices)
# RAID4 - 4 data drives, 1 parity (with metadata devices)
# Chunk size of 1MiB, force RAID initialization,
# min recovery rate at 20 kiB/sec/disk
0 1960893648 raid \
raid4 4 2048 min_recovery_rate 20 sync\
5 - 8:17 - 8:33 - 8:49 - 8:65 - 8:81
raid4 4 2048 sync min_recovery_rate 20 \
5 8:17 8:18 8:33 8:34 8:49 8:50 8:65 8:66 8:81 8:82
Performing a 'dmsetup table' should display the CTR table used to
construct the mapping (with possible reordering of optional
parameters).
'dmsetup table' displays the table used to construct the mapping.
The optional parameters are always printed in the order listed
above with "sync" or "nosync" always output ahead of the other
arguments, regardless of the order used when originally loading the table.
Arguments that can be repeated are ordered by value.
Performing a 'dmsetup status' will yield information on the state and
health of the array. The output is as follows:
'dmsetup status' yields information on the state and health of the
array.
The output is as follows:
1: <s> <l> raid \
2: <raid_type> <#devices> <1 health char for each dev> <resync_ratio>
Line 1 is standard DM output. Line 2 is best shown by example:
Line 1 is the standard output produced by device-mapper.
Line 2 is produced by the raid target, and best explained by example:
0 1960893648 raid raid4 5 AAAAA 2/490221568
Here we can see the RAID type is raid4, there are 5 devices - all of
which are 'A'live, and the array is 2/490221568 complete with recovery.
Faulty or missing devices are marked 'D'. Devices that are out-of-sync
are marked 'a'.

5
drivers/md/Kconfig
View File

@ -241,12 +241,13 @@ config DM_MIRROR
needed for live data migration tools such as 'pvmove'.
config DM_RAID
tristate "RAID 4/5/6 target (EXPERIMENTAL)"
tristate "RAID 1/4/5/6 target (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
select MD_RAID1
select MD_RAID456
select BLK_DEV_MD
---help---
A dm target that supports RAID4, RAID5 and RAID6 mappings
A dm target that supports RAID1, RAID4, RAID5 and RAID6 mappings
A RAID-5 set of N drives with a capacity of C MB per drive provides
the capacity of C * (N - 1) MB, and protects against a failure

62
drivers/md/dm-crypt.c
View File

@ -30,7 +30,6 @@
#include <linux/device-mapper.h>
#define DM_MSG_PREFIX "crypt"
#define MESG_STR(x) x, sizeof(x)
/*
* context holding the current state of a multi-part conversion
@ -239,7 +238,7 @@ static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv,
struct dm_crypt_request *dmreq)
{
memset(iv, 0, cc->iv_size);
*(u32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
*(__le32 *)iv = cpu_to_le32(dmreq->iv_sector & 0xffffffff);
return 0;
}
@ -248,7 +247,7 @@ static int crypt_iv_plain64_gen(struct crypt_config *cc, u8 *iv,
struct dm_crypt_request *dmreq)
{
memset(iv, 0, cc->iv_size);
*(u64 *)iv = cpu_to_le64(dmreq->iv_sector);
*(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
return 0;
}
@ -415,7 +414,7 @@ static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv,
struct crypto_cipher *essiv_tfm = this_crypt_config(cc)->iv_private;
memset(iv, 0, cc->iv_size);
*(u64 *)iv = cpu_to_le64(dmreq->iv_sector);
*(__le64 *)iv = cpu_to_le64(dmreq->iv_sector);
crypto_cipher_encrypt_one(essiv_tfm, iv, iv);
return 0;
@ -1575,11 +1574,17 @@ bad_mem:
static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct crypt_config *cc;
unsigned int key_size;
unsigned int key_size, opt_params;
unsigned long long tmpll;
int ret;
struct dm_arg_set as;
const char *opt_string;
if (argc != 5) {
static struct dm_arg _args[] = {
{0, 1, "Invalid number of feature args"},
};
if (argc < 5) {
ti->error = "Not enough arguments";
return -EINVAL;
}
@ -1648,6 +1653,30 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
cc->start = tmpll;
argv += 5;
argc -= 5;
/* Optional parameters */
if (argc) {
as.argc = argc;
as.argv = argv;
ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error);
if (ret)
goto bad;
opt_string = dm_shift_arg(&as);
if (opt_params == 1 && opt_string &&
!strcasecmp(opt_string, "allow_discards"))
ti->num_discard_requests = 1;
else if (opt_params) {
ret = -EINVAL;
ti->error = "Invalid feature arguments";
goto bad;
}
}
ret = -ENOMEM;
cc->io_queue = alloc_workqueue("kcryptd_io",
WQ_NON_REENTRANT|
@ -1682,9 +1711,16 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
struct dm_crypt_io *io;
struct crypt_config *cc;
if (bio->bi_rw & REQ_FLUSH) {
/*
* If bio is REQ_FLUSH or REQ_DISCARD, just bypass crypt queues.
* - for REQ_FLUSH device-mapper core ensures that no IO is in-flight
* - for REQ_DISCARD caller must use flush if IO ordering matters
*/
if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) {
cc = ti->private;
bio->bi_bdev = cc->dev->bdev;
if (bio_sectors(bio))
bio->bi_sector = cc->start + dm_target_offset(ti, bio->bi_sector);
return DM_MAPIO_REMAPPED;
}
@ -1727,6 +1763,10 @@ static int crypt_status(struct dm_target *ti, status_type_t type,
DMEMIT(" %llu %s %llu", (unsigned long long)cc->iv_offset,
cc->dev->name, (unsigned long long)cc->start);
if (ti->num_discard_requests)
DMEMIT(" 1 allow_discards");
break;
}
return 0;
@ -1770,12 +1810,12 @@ static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
if (argc < 2)
goto error;
if (!strnicmp(argv[0], MESG_STR("key"))) {
if (!strcasecmp(argv[0], "key")) {
if (!test_bit(DM_CRYPT_SUSPENDED, &cc->flags)) {
DMWARN("not suspended during key manipulation.");
return -EINVAL;
}
if (argc == 3 && !strnicmp(argv[1], MESG_STR("set"))) {
if (argc == 3 && !strcasecmp(argv[1], "set")) {
ret = crypt_set_key(cc, argv[2]);
if (ret)
return ret;
@ -1783,7 +1823,7 @@ static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
ret = cc->iv_gen_ops->init(cc);
return ret;
}
if (argc == 2 && !strnicmp(argv[1], MESG_STR("wipe"))) {
if (argc == 2 && !strcasecmp(argv[1], "wipe")) {
if (cc->iv_gen_ops && cc->iv_gen_ops->wipe) {
ret = cc->iv_gen_ops->wipe(cc);
if (ret)
@ -1823,7 +1863,7 @@ static int crypt_iterate_devices(struct dm_target *ti,
static struct target_type crypt_target = {
.name = "crypt",
.version = {1, 10, 0},
.version = {1, 11, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,

284
drivers/md/dm-flakey.c
View File

@ -1,6 +1,6 @@
/*
* Copyright (C) 2003 Sistina Software (UK) Limited.
* Copyright (C) 2004, 2010 Red Hat, Inc. All rights reserved.
* Copyright (C) 2004, 2010-2011 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
@ -15,6 +15,9 @@
#define DM_MSG_PREFIX "flakey"
#define all_corrupt_bio_flags_match(bio, fc) \
(((bio)->bi_rw & (fc)->corrupt_bio_flags) == (fc)->corrupt_bio_flags)
/*
* Flakey: Used for testing only, simulates intermittent,
* catastrophic device failure.
@ -25,60 +28,189 @@ struct flakey_c {
sector_t start;
unsigned up_interval;
unsigned down_interval;
unsigned long flags;
unsigned corrupt_bio_byte;
unsigned corrupt_bio_rw;
unsigned corrupt_bio_value;
unsigned corrupt_bio_flags;
};
/*
* Construct a flakey mapping: <dev_path> <offset> <up interval> <down interval>
*/
static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct flakey_c *fc;
unsigned long long tmp;
enum feature_flag_bits {
DROP_WRITES
};
if (argc != 4) {
ti->error = "dm-flakey: Invalid argument count";
static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
struct dm_target *ti)
{
int r;
unsigned argc;
const char *arg_name;
static struct dm_arg _args[] = {
{0, 6, "Invalid number of feature args"},
{1, UINT_MAX, "Invalid corrupt bio byte"},
{0, 255, "Invalid corrupt value to write into bio byte (0-255)"},
{0, UINT_MAX, "Invalid corrupt bio flags mask"},
};
/* No feature arguments supplied. */
if (!as->argc)
return 0;
r = dm_read_arg_group(_args, as, &argc, &ti->error);
if (r)
return r;
while (argc) {
arg_name = dm_shift_arg(as);
argc--;
/*
* drop_writes
*/
if (!strcasecmp(arg_name, "drop_writes")) {
if (test_and_set_bit(DROP_WRITES, &fc->flags)) {
ti->error = "Feature drop_writes duplicated";
return -EINVAL;
}
continue;
}
/*
* corrupt_bio_byte <Nth_byte> <direction> <value> <bio_flags>
*/
if (!strcasecmp(arg_name, "corrupt_bio_byte")) {
if (!argc)
ti->error = "Feature corrupt_bio_byte requires parameters";
r = dm_read_arg(_args + 1, as, &fc->corrupt_bio_byte, &ti->error);
if (r)
return r;
argc--;
/*
* Direction r or w?
*/
arg_name = dm_shift_arg(as);
if (!strcasecmp(arg_name, "w"))
fc->corrupt_bio_rw = WRITE;
else if (!strcasecmp(arg_name, "r"))
fc->corrupt_bio_rw = READ;
else {
ti->error = "Invalid corrupt bio direction (r or w)";
return -EINVAL;
}
argc--;
/*
* Value of byte (0-255) to write in place of correct one.
*/
r = dm_read_arg(_args + 2, as, &fc->corrupt_bio_value, &ti->error);
if (r)
return r;
argc--;
/*
* Only corrupt bios with these flags set.
*/
r = dm_read_arg(_args + 3, as, &fc->corrupt_bio_flags, &ti->error);
if (r)
return r;
argc--;
continue;
}
ti->error = "Unrecognised flakey feature requested";
return -EINVAL;
}
fc = kmalloc(sizeof(*fc), GFP_KERNEL);
if (test_bit(DROP_WRITES, &fc->flags) && (fc->corrupt_bio_rw == WRITE)) {
ti->error = "drop_writes is incompatible with corrupt_bio_byte with the WRITE flag set";
return -EINVAL;
}
return 0;
}
/*
* Construct a flakey mapping:
* <dev_path> <offset> <up interval> <down interval> [<#feature args> [<arg>]*]
*
* Feature args:
* [drop_writes]
* [corrupt_bio_byte <Nth_byte> <direction> <value> <bio_flags>]
*
* Nth_byte starts from 1 for the first byte.
* Direction is r for READ or w for WRITE.
* bio_flags is ignored if 0.
*/
static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
static struct dm_arg _args[] = {
{0, UINT_MAX, "Invalid up interval"},
{0, UINT_MAX, "Invalid down interval"},
};
int r;
struct flakey_c *fc;
unsigned long long tmpll;
struct dm_arg_set as;
const char *devname;
as.argc = argc;
as.argv = argv;
if (argc < 4) {
ti->error = "Invalid argument count";
return -EINVAL;
}
fc = kzalloc(sizeof(*fc), GFP_KERNEL);
if (!fc) {
ti->error = "dm-flakey: Cannot allocate linear context";
ti->error = "Cannot allocate linear context";
return -ENOMEM;
}
fc->start_time = jiffies;
if (sscanf(argv[1], "%llu", &tmp) != 1) {
ti->error = "dm-flakey: Invalid device sector";
goto bad;
}
fc->start = tmp;
devname = dm_shift_arg(&as);
if (sscanf(argv[2], "%u", &fc->up_interval) != 1) {
ti->error = "dm-flakey: Invalid up interval";
if (sscanf(dm_shift_arg(&as), "%llu", &tmpll) != 1) {
ti->error = "Invalid device sector";
goto bad;
}
fc->start = tmpll;
if (sscanf(argv[3], "%u", &fc->down_interval) != 1) {
ti->error = "dm-flakey: Invalid down interval";
r = dm_read_arg(_args, &as, &fc->up_interval, &ti->error);
if (r)
goto bad;
r = dm_read_arg(_args, &as, &fc->down_interval, &ti->error);
if (r)
goto bad;
}
if (!(fc->up_interval + fc->down_interval)) {
ti->error = "dm-flakey: Total (up + down) interval is zero";
ti->error = "Total (up + down) interval is zero";
goto bad;
}
if (fc->up_interval + fc->down_interval < fc->up_interval) {
ti->error = "dm-flakey: Interval overflow";
ti->error = "Interval overflow";
goto bad;
}
if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &fc->dev)) {
ti->error = "dm-flakey: Device lookup failed";
r = parse_features(&as, fc, ti);
if (r)
goto bad;
if (dm_get_device(ti, devname, dm_table_get_mode(ti->table), &fc->dev)) {
ti->error = "Device lookup failed";
goto bad;
}
ti->num_flush_requests = 1;
ti->num_discard_requests = 1;
ti->private = fc;
return 0;
@ -99,7 +231,7 @@ static sector_t flakey_map_sector(struct dm_target *ti, sector_t bi_sector)
{
struct flakey_c *fc = ti->private;
return fc->start + (bi_sector - ti->begin);
return fc->start + dm_target_offset(ti, bi_sector);
}
static void flakey_map_bio(struct dm_target *ti, struct bio *bio)
@ -111,6 +243,25 @@ static void flakey_map_bio(struct dm_target *ti, struct bio *bio)
bio->bi_sector = flakey_map_sector(ti, bio->bi_sector);
}
static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
{
unsigned bio_bytes = bio_cur_bytes(bio);
char *data = bio_data(bio);
/*
* Overwrite the Nth byte of the data returned.
*/
if (data && bio_bytes >= fc->corrupt_bio_byte) {
data[fc->corrupt_bio_byte - 1] = fc->corrupt_bio_value;
DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
"(rw=%c bi_rw=%lu bi_sector=%llu cur_bytes=%u)\n",
bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,
(bio_data_dir(bio) == WRITE) ? 'w' : 'r',
bio->bi_rw, (unsigned long long)bio->bi_sector, bio_bytes);
}
}
static int flakey_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
@ -119,18 +270,71 @@ static int flakey_map(struct dm_target *ti, struct bio *bio,
/* Are we alive ? */
elapsed = (jiffies - fc->start_time) / HZ;
if (elapsed % (fc->up_interval + fc->down_interval) >= fc->up_interval)
return -EIO;
if (elapsed % (fc->up_interval + fc->down_interval) >= fc->up_interval) {
/*
* Flag this bio as submitted while down.
*/
map_context->ll = 1;
/*
* Map reads as normal.
*/
if (bio_data_dir(bio) == READ)
goto map_bio;
/*
* Drop writes?
*/
if (test_bit(DROP_WRITES, &fc->flags)) {
bio_endio(bio, 0);
return DM_MAPIO_SUBMITTED;
}
/*
* Corrupt matching writes.
*/
if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == WRITE)) {
if (all_corrupt_bio_flags_match(bio, fc))
corrupt_bio_data(bio, fc);
goto map_bio;
}
/*
* By default, error all I/O.
*/
return -EIO;
}
map_bio:
flakey_map_bio(ti, bio);
return DM_MAPIO_REMAPPED;
}
static int flakey_end_io(struct dm_target *ti, struct bio *bio,
int error, union map_info *map_context)
{
struct flakey_c *fc = ti->private;
unsigned bio_submitted_while_down = map_context->ll;
/*
* Corrupt successful READs while in down state.
* If flags were specified, only corrupt those that match.
*/
if (!error && bio_submitted_while_down &&
(bio_data_dir(bio) == READ) && (fc->corrupt_bio_rw == READ) &&
all_corrupt_bio_flags_match(bio, fc))
corrupt_bio_data(bio, fc);
return error;
}
static int flakey_status(struct dm_target *ti, status_type_t type,
char *result, unsigned int maxlen)
{
unsigned sz = 0;
struct flakey_c *fc = ti->private;
unsigned drop_writes;
switch (type) {
case STATUSTYPE_INFO:
@ -138,9 +342,22 @@ static int flakey_status(struct dm_target *ti, status_type_t type,
break;
case STATUSTYPE_TABLE:
snprintf(result, maxlen, "%s %llu %u %u", fc->dev->name,
(unsigned long long)fc->start, fc->up_interval,
fc->down_interval);
DMEMIT("%s %llu %u %u ", fc->dev->name,
(unsigned long long)fc->start, fc->up_interval,
fc->down_interval);
drop_writes = test_bit(DROP_WRITES, &fc->flags);
DMEMIT("%u ", drop_writes + (fc->corrupt_bio_byte > 0) * 5);
if (drop_writes)
DMEMIT("drop_writes ");
if (fc->corrupt_bio_byte)
DMEMIT("corrupt_bio_byte %u %c %u %u ",
fc->corrupt_bio_byte,
(fc->corrupt_bio_rw == WRITE) ? 'w' : 'r',
fc->corrupt_bio_value, fc->corrupt_bio_flags);
break;
}
return 0;
@ -177,11 +394,12 @@ static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_
static struct target_type flakey_target = {
.name = "flakey",
.version = {1, 1, 0},
.version = {1, 2, 0},
.module = THIS_MODULE,
.ctr = flakey_ctr,
.dtr = flakey_dtr,
.map = flakey_map,
.end_io = flakey_end_io,
.status = flakey_status,
.ioctl = flakey_ioctl,
.merge = flakey_merge,

29
drivers/md/dm-io.c
View File

@ -38,6 +38,8 @@ struct io {
struct dm_io_client *client;
io_notify_fn callback;
void *context;
void *vma_invalidate_address;
unsigned long vma_invalidate_size;
} __attribute__((aligned(DM_IO_MAX_REGIONS)));
static struct kmem_cache *_dm_io_cache;
@ -116,6 +118,10 @@ static void dec_count(struct io *io, unsigned int region, int error)
set_bit(region, &io->error_bits);
if (atomic_dec_and_test(&io->count)) {
if (io->vma_invalidate_size)
invalidate_kernel_vmap_range(io->vma_invalidate_address,
io->vma_invalidate_size);
if (io->sleeper)
wake_up_process(io->sleeper);
@ -159,6 +165,9 @@ struct dpages {
unsigned context_u;
void *context_ptr;
void *vma_invalidate_address;
unsigned long vma_invalidate_size;
};
/*
@ -377,6 +386,9 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
io->sleeper = current;
io->client = client;
io->vma_invalidate_address = dp->vma_invalidate_address;
io->vma_invalidate_size = dp->vma_invalidate_size;
dispatch_io(rw, num_regions, where, dp, io, 1);
while (1) {
@ -415,13 +427,21 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
io->callback = fn;
io->context = context;
io->vma_invalidate_address = dp->vma_invalidate_address;
io->vma_invalidate_size = dp->vma_invalidate_size;
dispatch_io(rw, num_regions, where, dp, io, 0);
return 0;
}
static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
unsigned long size)
{
/* Set up dpages based on memory type */
dp->vma_invalidate_address = NULL;
dp->vma_invalidate_size = 0;
switch (io_req->mem.type) {
case DM_IO_PAGE_LIST:
list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);
@ -432,6 +452,11 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp)
break;
case DM_IO_VMA:
flush_kernel_vmap_range(io_req->mem.ptr.vma, size);
if ((io_req->bi_rw & RW_MASK) == READ) {
dp->vma_invalidate_address = io_req->mem.ptr.vma;
dp->vma_invalidate_size = size;
}
vm_dp_init(dp, io_req->mem.ptr.vma);
break;
@ -460,7 +485,7 @@ int dm_io(struct dm_io_request *io_req, unsigned num_regions,
int r;
struct dpages dp;
r = dp_init(io_req, &dp);
r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT);
if (r)
return r;

89
drivers/md/dm-ioctl.c
View File

@ -128,6 +128,24 @@ static struct hash_cell *__get_uuid_cell(const char *str)
return NULL;
}
static struct hash_cell *__get_dev_cell(uint64_t dev)
{
struct mapped_device *md;
struct hash_cell *hc;
md = dm_get_md(huge_decode_dev(dev));
if (!md)
return NULL;
hc = dm_get_mdptr(md);
if (!hc) {
dm_put(md);
return NULL;
}
return hc;
}
/*-----------------------------------------------------------------
* Inserting, removing and renaming a device.
*---------------------------------------------------------------*/
@ -718,25 +736,45 @@ static int dev_create(struct dm_ioctl *param, size_t param_size)
*/
static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param)
{
struct mapped_device *md;
void *mdptr = NULL;
struct hash_cell *hc = NULL;
if (*param->uuid)
return __get_uuid_cell(param->uuid);
if (*param->uuid) {
if (*param->name || param->dev)
return NULL;
if (*param->name)
return __get_name_cell(param->name);
hc = __get_uuid_cell(param->uuid);
if (!hc)
return NULL;
} else if (*param->name) {
if (param->dev)
return NULL;
md = dm_get_md(huge_decode_dev(param->dev));
if (!md)
goto out;
hc = __get_name_cell(param->name);
if (!hc)
return NULL;
} else if (param->dev) {
hc = __get_dev_cell(param->dev);
if (!hc)
return NULL;
} else
return NULL;
mdptr = dm_get_mdptr(md);
if (!mdptr)
dm_put(md);
/*
* Sneakily write in both the name and the uuid
* while we have the cell.
*/
strlcpy(param->name, hc->name, sizeof(param->name));
if (hc->uuid)
strlcpy(param->uuid, hc->uuid, sizeof(param->uuid));
else
param->uuid[0] = '\0';
out:
return mdptr;
if (hc->new_map)
param->flags |= DM_INACTIVE_PRESENT_FLAG;
else
param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
return hc;
}
static struct mapped_device *find_device(struct dm_ioctl *param)
@ -746,24 +784,8 @@ static struct mapped_device *find_device(struct dm_ioctl *param)
down_read(&_hash_lock);
hc = __find_device_hash_cell(param);
if (hc) {
if (hc)
md = hc->md;
/*
* Sneakily write in both the name and the uuid
* while we have the cell.
*/
strlcpy(param->name, hc->name, sizeof(param->name));
if (hc->uuid)
strlcpy(param->uuid, hc->uuid, sizeof(param->uuid));
else
param->uuid[0] = '\0';
if (hc->new_map)
param->flags |= DM_INACTIVE_PRESENT_FLAG;
else
param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
}
up_read(&_hash_lock);
return md;
@ -1402,6 +1424,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
goto out;
}
if (!argc) {
DMWARN("Empty message received.");
goto out;
}
table = dm_get_live_table(md);
if (!table)
goto out_argv;

42
drivers/md/dm-kcopyd.c
View File

@ -224,8 +224,6 @@ struct kcopyd_job {
unsigned int num_dests;
struct dm_io_region dests[DM_KCOPYD_MAX_REGIONS];
sector_t offset;
unsigned int nr_pages;
struct page_list *pages;
/*
@ -380,7 +378,7 @@ static int run_io_job(struct kcopyd_job *job)
.bi_rw = job->rw,
.mem.type = DM_IO_PAGE_LIST,
.mem.ptr.pl = job->pages,
.mem.offset = job->offset,
.mem.offset = 0,
.notify.fn = complete_io,
.notify.context = job,
.client = job->kc->io_client,
@ -397,10 +395,9 @@ static int run_io_job(struct kcopyd_job *job)
static int run_pages_job(struct kcopyd_job *job)
{
int r;
unsigned nr_pages = dm_div_up(job->dests[0].count, PAGE_SIZE >> 9);
job->nr_pages = dm_div_up(job->dests[0].count + job->offset,
PAGE_SIZE >> 9);
r = kcopyd_get_pages(job->kc, job->nr_pages, &job->pages);
r = kcopyd_get_pages(job->kc, nr_pages, &job->pages);
if (!r) {
/* this job is ready for io */
push(&job->kc->io_jobs, job);
@ -602,8 +599,6 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
job->num_dests = num_dests;
memcpy(&job->dests, dests, sizeof(*dests) * num_dests);
job->offset = 0;
job->nr_pages = 0;
job->pages = NULL;
job->fn = fn;
@ -622,6 +617,37 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
}
EXPORT_SYMBOL(dm_kcopyd_copy);
void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc,
dm_kcopyd_notify_fn fn, void *context)
{
struct kcopyd_job *job;
job = mempool_alloc(kc->job_pool, GFP_NOIO);
memset(job, 0, sizeof(struct kcopyd_job));
job->kc = kc;
job->fn = fn;
job->context = context;
atomic_inc(&kc->nr_jobs);
return job;
}
EXPORT_SYMBOL(dm_kcopyd_prepare_callback);
void dm_kcopyd_do_callback(void *j, int read_err, unsigned long write_err)
{
struct kcopyd_job *job = j;
struct dm_kcopyd_client *kc = job->kc;
job->read_err = read_err;
job->write_err = write_err;
push(&kc->complete_jobs, job);
wake(kc);
}
EXPORT_SYMBOL(dm_kcopyd_do_callback);
/*
* Cancels a kcopyd job, eg. someone might be deactivating a
* mirror.

3
drivers/md/dm-log-userspace-base.c
View File

@ -394,8 +394,7 @@ static int flush_by_group(struct log_c *lc, struct list_head *flush_list)
group[count] = fe->region;
count++;
list_del(&fe->list);
list_add(&fe->list, &tmp_list);
list_move(&fe->list, &tmp_list);
type = fe->type;
if (count >= MAX_FLUSH_GROUP_COUNT)

32
drivers/md/dm-log.c
View File

@ -197,15 +197,21 @@ EXPORT_SYMBOL(dm_dirty_log_destroy);
#define MIRROR_DISK_VERSION 2
#define LOG_OFFSET 2
struct log_header {
uint32_t magic;
struct log_header_disk {
__le32 magic;
/*
* Simple, incrementing version. no backward
* compatibility.
*/
__le32 version;
__le64 nr_regions;
} __packed;
struct log_header_core {
uint32_t magic;
uint32_t version;
sector_t nr_regions;
uint64_t nr_regions;
};
struct log_c {
@ -239,10 +245,10 @@ struct log_c {
int log_dev_failed;
int log_dev_flush_failed;
struct dm_dev *log_dev;
struct log_header header;
struct log_header_core header;
struct dm_io_region header_location;
struct log_header *disk_header;
struct log_header_disk *disk_header;
};
/*
@ -251,34 +257,34 @@ struct log_c {
*/
static inline int log_test_bit(uint32_t *bs, unsigned bit)
{
return test_bit_le(bit, (unsigned long *) bs) ? 1 : 0;
return test_bit_le(bit, bs) ? 1 : 0;
}
static inline void log_set_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
__test_and_set_bit_le(bit, (unsigned long *) bs);
__set_bit_le(bit, bs);
l->touched_cleaned = 1;
}
static inline void log_clear_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
__test_and_clear_bit_le(bit, (unsigned long *) bs);
__clear_bit_le(bit, bs);
l->touched_dirtied = 1;
}
/*----------------------------------------------------------------
* Header IO
*--------------------------------------------------------------*/
static void header_to_disk(struct log_header *core, struct log_header *disk)
static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk)
{
disk->magic = cpu_to_le32(core->magic);
disk->version = cpu_to_le32(core->version);
disk->nr_regions = cpu_to_le64(core->nr_regions);
}
static void header_from_disk(struct log_header *core, struct log_header *disk)
static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk)
{
core->magic = le32_to_cpu(disk->magic);
core->version = le32_to_cpu(disk->version);
@ -486,7 +492,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size);
lc->sync_count = (sync == NOSYNC) ? region_count : 0;
lc->recovering_bits = vmalloc(bitset_size);
lc->recovering_bits = vzalloc(bitset_size);
if (!lc->recovering_bits) {
DMWARN("couldn't allocate sync bitset");
vfree(lc->sync_bits);
@ -498,7 +504,6 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
kfree(lc);
return -ENOMEM;
}
memset(lc->recovering_bits, 0, bitset_size);
lc->sync_search = 0;
log->context = lc;
@ -739,8 +744,7 @@ static int core_get_resync_work(struct dm_dirty_log *log, region_t *region)
return 0;
do {
*region = find_next_zero_bit_le(
(unsigned long *) lc->sync_bits,
*region = find_next_zero_bit_le(lc->sync_bits,
lc->region_count,
lc->sync_search);
lc->sync_search = *region + 1;

147
drivers/md/dm-mpath.c
View File

@ -22,7 +22,6 @@
#include <linux/atomic.h>
#define DM_MSG_PREFIX "multipath"
#define MESG_STR(x) x, sizeof(x)
#define DM_PG_INIT_DELAY_MSECS 2000
#define DM_PG_INIT_DELAY_DEFAULT ((unsigned) -1)
@ -505,80 +504,29 @@ static void trigger_event(struct work_struct *work)
* <#paths> <#per-path selector args>
* [<path> [<arg>]* ]+ ]+
*---------------------------------------------------------------*/
struct param {
unsigned min;
unsigned max;
char *error;
};
static int read_param(struct param *param, char *str, unsigned *v, char **error)
{
if (!str ||
(sscanf(str, "%u", v) != 1) ||
(*v < param->min) ||
(*v > param->max)) {
*error = param->error;
return -EINVAL;
}
return 0;
}
struct arg_set {
unsigned argc;
char **argv;
};
static char *shift(struct arg_set *as)
{
char *r;
if (as->argc) {
as->argc--;
r = *as->argv;
as->argv++;
return r;
}
return NULL;
}
static void consume(struct arg_set *as, unsigned n)
{
BUG_ON (as->argc < n);
as->argc -= n;
as->argv += n;
}
static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
static int parse_path_selector(struct dm_arg_set *as, struct priority_group *pg,
struct dm_target *ti)
{
int r;
struct path_selector_type *pst;
unsigned ps_argc;
static struct param _params[] = {
static struct dm_arg _args[] = {
{0, 1024, "invalid number of path selector args"},
};
pst = dm_get_path_selector(shift(as));
pst = dm_get_path_selector(dm_shift_arg(as));
if (!pst) {
ti->error = "unknown path selector type";
return -EINVAL;
}
r = read_param(_params, shift(as), &ps_argc, &ti->error);
r = dm_read_arg_group(_args, as, &ps_argc, &ti->error);
if (r) {
dm_put_path_selector(pst);
return -EINVAL;
}
if (ps_argc > as->argc) {
dm_put_path_selector(pst);
ti->error = "not enough arguments for path selector";
return -EINVAL;
}
r = pst->create(&pg->ps, ps_argc, as->argv);
if (r) {
dm_put_path_selector(pst);
@ -587,12 +535,12 @@ static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
}
pg->ps.type = pst;
consume(as, ps_argc);
dm_consume_args(as, ps_argc);
return 0;
}
static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps,
struct dm_target *ti)
{
int r;
@ -609,7 +557,7 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
if (!p)
return ERR_PTR(-ENOMEM);
r = dm_get_device(ti, shift(as), dm_table_get_mode(ti->table),
r = dm_get_device(ti, dm_shift_arg(as), dm_table_get_mode(ti->table),
&p->path.dev);
if (r) {
ti->error = "error getting device";
@ -660,16 +608,16 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
return ERR_PTR(r);
}
static struct priority_group *parse_priority_group(struct arg_set *as,
static struct priority_group *parse_priority_group(struct dm_arg_set *as,
struct multipath *m)
{
static struct param _params[] = {
static struct dm_arg _args[] = {
{1, 1024, "invalid number of paths"},
{0, 1024, "invalid number of selector args"}
};
int r;
unsigned i, nr_selector_args, nr_params;
unsigned i, nr_selector_args, nr_args;
struct priority_group *pg;
struct dm_target *ti = m->ti;
@ -693,26 +641,26 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
/*
* read the paths
*/
r = read_param(_params, shift(as), &pg->nr_pgpaths, &ti->error);
r = dm_read_arg(_args, as, &pg->nr_pgpaths, &ti->error);
if (r)
goto bad;
r = read_param(_params + 1, shift(as), &nr_selector_args, &ti->error);
r = dm_read_arg(_args + 1, as, &nr_selector_args, &ti->error);
if (r)
goto bad;
nr_params = 1 + nr_selector_args;
nr_args = 1 + nr_selector_args;
for (i = 0; i < pg->nr_pgpaths; i++) {
struct pgpath *pgpath;
struct arg_set path_args;
struct dm_arg_set path_args;
if (as->argc < nr_params) {
if (as->argc < nr_args) {
ti->error = "not enough path parameters";
r = -EINVAL;
goto bad;
}
path_args.argc = nr_params;
path_args.argc = nr_args;
path_args.argv = as->argv;
pgpath = parse_path(&path_args, &pg->ps, ti);
@ -723,7 +671,7 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
pgpath->pg = pg;
list_add_tail(&pgpath->list, &pg->pgpaths);
consume(as, nr_params);
dm_consume_args(as, nr_args);
}
return pg;
@ -733,28 +681,23 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
return ERR_PTR(r);
}
static int parse_hw_handler(struct arg_set *as, struct multipath *m)
static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
{
unsigned hw_argc;
int ret;
struct dm_target *ti = m->ti;
static struct param _params[] = {
static struct dm_arg _args[] = {
{0, 1024, "invalid number of hardware handler args"},
};
if (read_param(_params, shift(as), &hw_argc, &ti->error))
if (dm_read_arg_group(_args, as, &hw_argc, &ti->error))
return -EINVAL;
if (!hw_argc)
return 0;
if (hw_argc > as->argc) {
ti->error = "not enough arguments for hardware handler";
return -EINVAL;
}
m->hw_handler_name = kstrdup(shift(as), GFP_KERNEL);
m->hw_handler_name = kstrdup(dm_shift_arg(as), GFP_KERNEL);
request_module("scsi_dh_%s", m->hw_handler_name);
if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
ti->error = "unknown hardware handler type";
@ -778,7 +721,7 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m)
for (i = 0, p+=j+1; i <= hw_argc - 2; i++, p+=j+1)
j = sprintf(p, "%s", as->argv[i]);
}
consume(as, hw_argc - 1);
dm_consume_args(as, hw_argc - 1);
return 0;
fail:
@ -787,20 +730,20 @@ fail:
return ret;
}
static int parse_features(struct arg_set *as, struct multipath *m)
static int parse_features(struct dm_arg_set *as, struct multipath *m)
{
int r;
unsigned argc;
struct dm_target *ti = m->ti;
const char *param_name;
const char *arg_name;
static struct param _params[] = {
static struct dm_arg _args[] = {
{0, 5, "invalid number of feature args"},
{1, 50, "pg_init_retries must be between 1 and 50"},
{0, 60000, "pg_init_delay_msecs must be between 0 and 60000"},
};
r = read_param(_params, shift(as), &argc, &ti->error);
r = dm_read_arg_group(_args, as, &argc, &ti->error);
if (r)
return -EINVAL;
@ -808,26 +751,24 @@ static int parse_features(struct arg_set *as, struct multipath *m)
return 0;
do {
param_name = shift(as);
arg_name = dm_shift_arg(as);
argc--;
if (!strnicmp(param_name, MESG_STR("queue_if_no_path"))) {
if (!strcasecmp(arg_name, "queue_if_no_path")) {
r = queue_if_no_path(m, 1, 0);
continue;
}
if (!strnicmp(param_name, MESG_STR("pg_init_retries")) &&
if (!strcasecmp(arg_name, "pg_init_retries") &&
(argc >= 1)) {
r = read_param(_params + 1, shift(as),
&m->pg_init_retries, &ti->error);
r = dm_read_arg(_args + 1, as, &m->pg_init_retries, &ti->error);
argc--;
continue;
}
if (!strnicmp(param_name, MESG_STR("pg_init_delay_msecs")) &&
if (!strcasecmp(arg_name, "pg_init_delay_msecs") &&
(argc >= 1)) {
r = read_param(_params + 2, shift(as),
&m->pg_init_delay_msecs, &ti->error);
r = dm_read_arg(_args + 2, as, &m->pg_init_delay_msecs, &ti->error);
argc--;
continue;
}
@ -842,15 +783,15 @@ static int parse_features(struct arg_set *as, struct multipath *m)
static int multipath_ctr(struct dm_target *ti, unsigned int argc,
char **argv)
{
/* target parameters */
static struct param _params[] = {
/* target arguments */
static struct dm_arg _args[] = {
{0, 1024, "invalid number of priority groups"},
{0, 1024, "invalid initial priority group number"},
};
int r;
struct multipath *m;
struct arg_set as;
struct dm_arg_set as;
unsigned pg_count = 0;
unsigned next_pg_num;
@ -871,11 +812,11 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
if (r)
goto bad;
r = read_param(_params, shift(&as), &m->nr_priority_groups, &ti->error);
r = dm_read_arg(_args, &as, &m->nr_priority_groups, &ti->error);
if (r)
goto bad;
r = read_param(_params + 1, shift(&as), &next_pg_num, &ti->error);
r = dm_read_arg(_args + 1, &as, &next_pg_num, &ti->error);
if (r)
goto bad;
@ -1505,10 +1446,10 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
}
if (argc == 1) {
if (!strnicmp(argv[0], MESG_STR("queue_if_no_path"))) {
if (!strcasecmp(argv[0], "queue_if_no_path")) {
r = queue_if_no_path(m, 1, 0);
goto out;
} else if (!strnicmp(argv[0], MESG_STR("fail_if_no_path"))) {
} else if (!strcasecmp(argv[0], "fail_if_no_path")) {
r = queue_if_no_path(m, 0, 0);
goto out;
}
@ -1519,18 +1460,18 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
goto out;
}
if (!strnicmp(argv[0], MESG_STR("disable_group"))) {
if (!strcasecmp(argv[0], "disable_group")) {
r = bypass_pg_num(m, argv[1], 1);
goto out;
} else if (!strnicmp(argv[0], MESG_STR("enable_group"))) {
} else if (!strcasecmp(argv[0], "enable_group")) {
r = bypass_pg_num(m, argv[1], 0);
goto out;
} else if (!strnicmp(argv[0], MESG_STR("switch_group"))) {
} else if (!strcasecmp(argv[0], "switch_group")) {
r = switch_pg_num(m, argv[1]);
goto out;
} else if (!strnicmp(argv[0], MESG_STR("reinstate_path")))
} else if (!strcasecmp(argv[0], "reinstate_path"))
action = reinstate_path;
else if (!strnicmp(argv[0], MESG_STR("fail_path")))
else if (!strcasecmp(argv[0], "fail_path"))
action = fail_path;
else {
DMWARN("Unrecognised multipath message received.");

623
drivers/md/dm-raid.c
View File

@ -8,19 +8,19 @@
#include <linux/slab.h>
#include "md.h"
#include "raid1.h"
#include "raid5.h"
#include "dm.h"
#include "bitmap.h"
#include <linux/device-mapper.h>
#define DM_MSG_PREFIX "raid"
/*
* If the MD doesn't support MD_SYNC_STATE_FORCED yet, then
* make it so the flag doesn't set anything.
* The following flags are used by dm-raid.c to set up the array state.
* They must be cleared before md_run is called.
*/
#ifndef MD_SYNC_STATE_FORCED
#define MD_SYNC_STATE_FORCED 0
#endif
#define FirstUse 10 /* rdev flag */
struct raid_dev {
/*
@ -43,14 +43,15 @@ struct raid_dev {
/*
* Flags for rs->print_flags field.
*/
#define DMPF_DAEMON_SLEEP 0x1
#define DMPF_MAX_WRITE_BEHIND 0x2
#define DMPF_SYNC 0x4
#define DMPF_NOSYNC 0x8
#define DMPF_STRIPE_CACHE 0x10
#define DMPF_MIN_RECOVERY_RATE 0x20
#define DMPF_MAX_RECOVERY_RATE 0x40
#define DMPF_SYNC 0x1
#define DMPF_NOSYNC 0x2
#define DMPF_REBUILD 0x4
#define DMPF_DAEMON_SLEEP 0x8
#define DMPF_MIN_RECOVERY_RATE 0x10
#define DMPF_MAX_RECOVERY_RATE 0x20
#define DMPF_MAX_WRITE_BEHIND 0x40
#define DMPF_STRIPE_CACHE 0x80
#define DMPF_REGION_SIZE 0X100
struct raid_set {
struct dm_target *ti;
@ -72,6 +73,7 @@ static struct raid_type {
const unsigned level; /* RAID level. */
const unsigned algorithm; /* RAID algorithm. */
} raid_types[] = {
{"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */},
{"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0},
{"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
{"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
@ -105,7 +107,8 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra
}
sectors_per_dev = ti->len;
if (sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
if ((raid_type->level > 1) &&
sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
ti->error = "Target length not divisible by number of data devices";
return ERR_PTR(-EINVAL);
}
@ -147,9 +150,16 @@ static void context_free(struct raid_set *rs)
{
int i;
for (i = 0; i < rs->md.raid_disks; i++)
for (i = 0; i < rs->md.raid_disks; i++) {
if (rs->dev[i].meta_dev)
dm_put_device(rs->ti, rs->dev[i].meta_dev);
if (rs->dev[i].rdev.sb_page)
put_page(rs->dev[i].rdev.sb_page);
rs->dev[i].rdev.sb_page = NULL;
rs->dev[i].rdev.sb_loaded = 0;
if (rs->dev[i].data_dev)
dm_put_device(rs->ti, rs->dev[i].data_dev);
}
kfree(rs);
}
@ -159,7 +169,16 @@ static void context_free(struct raid_set *rs)
* <meta_dev>: meta device name or '-' if missing
* <data_dev>: data device name or '-' if missing
*
* This code parses those words.
* The following are permitted:
* - -
* - <data_dev>
* <meta_dev> <data_dev>
*
* The following is not allowed:
* <meta_dev> -
*
* This code parses those words. If there is a failure,
* the caller must use context_free to unwind the operations.
*/
static int dev_parms(struct raid_set *rs, char **argv)
{
@ -182,8 +201,16 @@ static int dev_parms(struct raid_set *rs, char **argv)
rs->dev[i].rdev.mddev = &rs->md;
if (strcmp(argv[0], "-")) {
rs->ti->error = "Metadata devices not supported";
return -EINVAL;
ret = dm_get_device(rs->ti, argv[0],
dm_table_get_mode(rs->ti->table),
&rs->dev[i].meta_dev);
rs->ti->error = "RAID metadata device lookup failure";
if (ret)
return ret;
rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
if (!rs->dev[i].rdev.sb_page)
return -ENOMEM;
}
if (!strcmp(argv[1], "-")) {
@ -193,6 +220,10 @@ static int dev_parms(struct raid_set *rs, char **argv)
return -EINVAL;
}
rs->ti->error = "No data device supplied with metadata device";
if (rs->dev[i].meta_dev)
return -EINVAL;
continue;
}
@ -204,6 +235,10 @@ static int dev_parms(struct raid_set *rs, char **argv)
return ret;
}
if (rs->dev[i].meta_dev) {
metadata_available = 1;
rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
}
rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
list_add(&rs->dev[i].rdev.same_set, &rs->md.disks);
if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
@ -234,57 +269,150 @@ static int dev_parms(struct raid_set *rs, char **argv)
return 0;
}
/*
* validate_region_size
* @rs
* @region_size: region size in sectors. If 0, pick a size (4MiB default).
*
* Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
* Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
*
* Returns: 0 on success, -EINVAL on failure.
*/
static int validate_region_size(struct raid_set *rs, unsigned long region_size)
{
unsigned long min_region_size = rs->ti->len / (1 << 21);
if (!region_size) {
/*
* Choose a reasonable default. All figures in sectors.
*/
if (min_region_size > (1 << 13)) {
DMINFO("Choosing default region size of %lu sectors",
region_size);
region_size = min_region_size;
} else {
DMINFO("Choosing default region size of 4MiB");
region_size = 1 << 13; /* sectors */
}
} else {
/*
* Validate user-supplied value.
*/
if (region_size > rs->ti->len) {
rs->ti->error = "Supplied region size is too large";
return -EINVAL;
}
if (region_size < min_region_size) {
DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
region_size, min_region_size);
rs->ti->error = "Supplied region size is too small";
return -EINVAL;
}
if (!is_power_of_2(region_size)) {
rs->ti->error = "Region size is not a power of 2";
return -EINVAL;
}
if (region_size < rs->md.chunk_sectors) {
rs->ti->error = "Region size is smaller than the chunk size";
return -EINVAL;
}
}
/*
* Convert sectors to bytes.
*/
rs->md.bitmap_info.chunksize = (region_size << 9);
return 0;
}
/*
* Possible arguments are...
* RAID456:
* <chunk_size> [optional_args]
*
* Optional args:
* [[no]sync] Force or prevent recovery of the entire array
* Argument definitions
* <chunk_size> The number of sectors per disk that
* will form the "stripe"
* [[no]sync] Force or prevent recovery of the
* entire array
* [rebuild <idx>] Rebuild the drive indicated by the index
* [daemon_sleep <ms>] Time between bitmap daemon work to clear bits
* [daemon_sleep <ms>] Time between bitmap daemon work to
* clear bits
* [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
* [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
* [write_mostly <idx>] Indicate a write mostly drive via index
* [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
* [stripe_cache <sectors>] Stripe cache size for higher RAIDs
* [region_size <sectors>] Defines granularity of bitmap
*/
static int parse_raid_params(struct raid_set *rs, char **argv,
unsigned num_raid_params)
{
unsigned i, rebuild_cnt = 0;
unsigned long value;
unsigned long value, region_size = 0;
char *key;
/*
* First, parse the in-order required arguments
* "chunk_size" is the only argument of this type.
*/
if ((strict_strtoul(argv[0], 10, &value) < 0) ||
!is_power_of_2(value) || (value < 8)) {
if ((strict_strtoul(argv[0], 10, &value) < 0)) {
rs->ti->error = "Bad chunk size";
return -EINVAL;
} else if (rs->raid_type->level == 1) {
if (value)
DMERR("Ignoring chunk size parameter for RAID 1");
value = 0;
} else if (!is_power_of_2(value)) {
rs->ti->error = "Chunk size must be a power of 2";
return -EINVAL;
} else if (value < 8) {
rs->ti->error = "Chunk size value is too small";
return -EINVAL;
}
rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
argv++;
num_raid_params--;
/*
* We set each individual device as In_sync with a completed
* 'recovery_offset'. If there has been a device failure or
* replacement then one of the following cases applies:
*
* 1) User specifies 'rebuild'.
* - Device is reset when param is read.
* 2) A new device is supplied.
* - No matching superblock found, resets device.
* 3) Device failure was transient and returns on reload.
* - Failure noticed, resets device for bitmap replay.
* 4) Device hadn't completed recovery after previous failure.
* - Superblock is read and overrides recovery_offset.
*
* What is found in the superblocks of the devices is always
* authoritative, unless 'rebuild' or '[no]sync' was specified.
*/
for (i = 0; i < rs->md.raid_disks; i++) {
set_bit(In_sync, &rs->dev[i].rdev.flags);
rs->dev[i].rdev.recovery_offset = MaxSector;
}
/*
* Second, parse the unordered optional arguments
*/
for (i = 0; i < rs->md.raid_disks; i++)
set_bit(In_sync, &rs->dev[i].rdev.flags);
for (i = 0; i < num_raid_params; i++) {
if (!strcmp(argv[i], "nosync")) {
if (!strcasecmp(argv[i], "nosync")) {
rs->md.recovery_cp = MaxSector;
rs->print_flags |= DMPF_NOSYNC;
rs->md.flags |= MD_SYNC_STATE_FORCED;
continue;
}
if (!strcmp(argv[i], "sync")) {
if (!strcasecmp(argv[i], "sync")) {
rs->md.recovery_cp = 0;
rs->print_flags |= DMPF_SYNC;
rs->md.flags |= MD_SYNC_STATE_FORCED;
continue;
}
@ -300,9 +428,13 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
return -EINVAL;
}
if (!strcmp(key, "rebuild")) {
if (++rebuild_cnt > rs->raid_type->parity_devs) {
rs->ti->error = "Too many rebuild drives given";
if (!strcasecmp(key, "rebuild")) {
rebuild_cnt++;
if (((rs->raid_type->level != 1) &&
(rebuild_cnt > rs->raid_type->parity_devs)) ||
((rs->raid_type->level == 1) &&
(rebuild_cnt > (rs->md.raid_disks - 1)))) {
rs->ti->error = "Too many rebuild devices specified for given RAID type";
return -EINVAL;
}
if (value > rs->md.raid_disks) {
@ -311,7 +443,22 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
}
clear_bit(In_sync, &rs->dev[value].rdev.flags);
rs->dev[value].rdev.recovery_offset = 0;
} else if (!strcmp(key, "max_write_behind")) {
rs->print_flags |= DMPF_REBUILD;
} else if (!strcasecmp(key, "write_mostly")) {
if (rs->raid_type->level != 1) {
rs->ti->error = "write_mostly option is only valid for RAID1";
return -EINVAL;
}
if (value > rs->md.raid_disks) {
rs->ti->error = "Invalid write_mostly drive index given";
return -EINVAL;
}
set_bit(WriteMostly, &rs->dev[value].rdev.flags);
} else if (!strcasecmp(key, "max_write_behind")) {
if (rs->raid_type->level != 1) {
rs->ti->error = "max_write_behind option is only valid for RAID1";
return -EINVAL;
}
rs->print_flags |= DMPF_MAX_WRITE_BEHIND;
/*
@ -324,14 +471,14 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
return -EINVAL;
}
rs->md.bitmap_info.max_write_behind = value;
} else if (!strcmp(key, "daemon_sleep")) {
} else if (!strcasecmp(key, "daemon_sleep")) {
rs->print_flags |= DMPF_DAEMON_SLEEP;
if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
rs->ti->error = "daemon sleep period out of range";
return -EINVAL;
}
rs->md.bitmap_info.daemon_sleep = value;
} else if (!strcmp(key, "stripe_cache")) {
} else if (!strcasecmp(key, "stripe_cache")) {
rs->print_flags |= DMPF_STRIPE_CACHE;
/*
@ -348,20 +495,23 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
rs->ti->error = "Bad stripe_cache size";
return -EINVAL;
}
} else if (!strcmp(key, "min_recovery_rate")) {
} else if (!strcasecmp(key, "min_recovery_rate")) {
rs->print_flags |= DMPF_MIN_RECOVERY_RATE;
if (value > INT_MAX) {
rs->ti->error = "min_recovery_rate out of range";
return -EINVAL;
}
rs->md.sync_speed_min = (int)value;
} else if (!strcmp(key, "max_recovery_rate")) {
} else if (!strcasecmp(key, "max_recovery_rate")) {
rs->print_flags |= DMPF_MAX_RECOVERY_RATE;
if (value > INT_MAX) {
rs->ti->error = "max_recovery_rate out of range";
return -EINVAL;
}
rs->md.sync_speed_max = (int)value;
} else if (!strcasecmp(key, "region_size")) {
rs->print_flags |= DMPF_REGION_SIZE;
region_size = value;
} else {
DMERR("Unable to parse RAID parameter: %s", key);
rs->ti->error = "Unable to parse RAID parameters";
@ -369,6 +519,19 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
}
}
if (validate_region_size(rs, region_size))
return -EINVAL;
if (rs->md.chunk_sectors)
rs->ti->split_io = rs->md.chunk_sectors;
else
rs->ti->split_io = region_size;
if (rs->md.chunk_sectors)
rs->ti->split_io = rs->md.chunk_sectors;
else
rs->ti->split_io = region_size;
/* Assume there are no metadata devices until the drives are parsed */
rs->md.persistent = 0;
rs->md.external = 1;
@ -387,17 +550,351 @@ static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
{
struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
if (rs->raid_type->level == 1)
return md_raid1_congested(&rs->md, bits);
return md_raid5_congested(&rs->md, bits);
}
/*
* This structure is never routinely used by userspace, unlike md superblocks.
* Devices with this superblock should only ever be accessed via device-mapper.
*/
#define DM_RAID_MAGIC 0x64526D44
struct dm_raid_superblock {
__le32 magic; /* "DmRd" */
__le32 features; /* Used to indicate possible future changes */
__le32 num_devices; /* Number of devices in this array. (Max 64) */
__le32 array_position; /* The position of this drive in the array */
__le64 events; /* Incremented by md when superblock updated */
__le64 failed_devices; /* Bit field of devices to indicate failures */
/*
* This offset tracks the progress of the repair or replacement of
* an individual drive.
*/
__le64 disk_recovery_offset;
/*
* This offset tracks the progress of the initial array
* synchronisation/parity calculation.
*/
__le64 array_resync_offset;
/*
* RAID characteristics
*/
__le32 level;
__le32 layout;
__le32 stripe_sectors;
__u8 pad[452]; /* Round struct to 512 bytes. */
/* Always set to 0 when writing. */
} __packed;
static int read_disk_sb(mdk_rdev_t *rdev, int size)
{
BUG_ON(!rdev->sb_page);
if (rdev->sb_loaded)
return 0;
if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) {
DMERR("Failed to read device superblock");
return -EINVAL;
}
rdev->sb_loaded = 1;
return 0;
}
static void super_sync(mddev_t *mddev, mdk_rdev_t *rdev)
{
mdk_rdev_t *r, *t;
uint64_t failed_devices;
struct dm_raid_superblock *sb;
sb = page_address(rdev->sb_page);
failed_devices = le64_to_cpu(sb->failed_devices);
rdev_for_each(r, t, mddev)
if ((r->raid_disk >= 0) && test_bit(Faulty, &r->flags))
failed_devices |= (1ULL << r->raid_disk);
memset(sb, 0, sizeof(*sb));
sb->magic = cpu_to_le32(DM_RAID_MAGIC);
sb->features = cpu_to_le32(0); /* No features yet */
sb->num_devices = cpu_to_le32(mddev->raid_disks);
sb->array_position = cpu_to_le32(rdev->raid_disk);
sb->events = cpu_to_le64(mddev->events);
sb->failed_devices = cpu_to_le64(failed_devices);
sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
sb->level = cpu_to_le32(mddev->level);
sb->layout = cpu_to_le32(mddev->layout);
sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
}
/*
* super_load
*
* This function creates a superblock if one is not found on the device
* and will decide which superblock to use if there's a choice.
*
* Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
*/
static int super_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev)
{
int ret;
struct dm_raid_superblock *sb;
struct dm_raid_superblock *refsb;
uint64_t events_sb, events_refsb;
rdev->sb_start = 0;
rdev->sb_size = sizeof(*sb);
ret = read_disk_sb(rdev, rdev->sb_size);
if (ret)
return ret;
sb = page_address(rdev->sb_page);
if (sb->magic != cpu_to_le32(DM_RAID_MAGIC)) {
super_sync(rdev->mddev, rdev);
set_bit(FirstUse, &rdev->flags);
/* Force writing of superblocks to disk */
set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags);
/* Any superblock is better than none, choose that if given */
return refdev ? 0 : 1;
}
if (!refdev)
return 1;
events_sb = le64_to_cpu(sb->events);
refsb = page_address(refdev->sb_page);
events_refsb = le64_to_cpu(refsb->events);
return (events_sb > events_refsb) ? 1 : 0;
}
static int super_init_validation(mddev_t *mddev, mdk_rdev_t *rdev)
{
int role;
struct raid_set *rs = container_of(mddev, struct raid_set, md);
uint64_t events_sb;
uint64_t failed_devices;
struct dm_raid_superblock *sb;
uint32_t new_devs = 0;
uint32_t rebuilds = 0;
mdk_rdev_t *r, *t;
struct dm_raid_superblock *sb2;
sb = page_address(rdev->sb_page);
events_sb = le64_to_cpu(sb->events);
failed_devices = le64_to_cpu(sb->failed_devices);
/*
* Initialise to 1 if this is a new superblock.
*/
mddev->events = events_sb ? : 1;
/*
* Reshaping is not currently allowed
*/
if ((le32_to_cpu(sb->level) != mddev->level) ||
(le32_to_cpu(sb->layout) != mddev->layout) ||
(le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors)) {
DMERR("Reshaping arrays not yet supported.");
return -EINVAL;
}
/* We can only change the number of devices in RAID1 right now */
if ((rs->raid_type->level != 1) &&
(le32_to_cpu(sb->num_devices) != mddev->raid_disks)) {
DMERR("Reshaping arrays not yet supported.");
return -EINVAL;
}
if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)))
mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
/*
* During load, we set FirstUse if a new superblock was written.
* There are two reasons we might not have a superblock:
* 1) The array is brand new - in which case, all of the
* devices must have their In_sync bit set. Also,
* recovery_cp must be 0, unless forced.
* 2) This is a new device being added to an old array
* and the new device needs to be rebuilt - in which
* case the In_sync bit will /not/ be set and
* recovery_cp must be MaxSector.
*/
rdev_for_each(r, t, mddev) {
if (!test_bit(In_sync, &r->flags)) {
if (!test_bit(FirstUse, &r->flags))
DMERR("Superblock area of "
"rebuild device %d should have been "
"cleared.", r->raid_disk);
set_bit(FirstUse, &r->flags);
rebuilds++;
} else if (test_bit(FirstUse, &r->flags))
new_devs++;
}
if (!rebuilds) {
if (new_devs == mddev->raid_disks) {
DMINFO("Superblocks created for new array");
set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
} else if (new_devs) {
DMERR("New device injected "
"into existing array without 'rebuild' "
"parameter specified");
return -EINVAL;
}
} else if (new_devs) {
DMERR("'rebuild' devices cannot be "
"injected into an array with other first-time devices");
return -EINVAL;
} else if (mddev->recovery_cp != MaxSector) {
DMERR("'rebuild' specified while array is not in-sync");
return -EINVAL;
}
/*
* Now we set the Faulty bit for those devices that are
* recorded in the superblock as failed.
*/
rdev_for_each(r, t, mddev) {
if (!r->sb_page)
continue;
sb2 = page_address(r->sb_page);
sb2->failed_devices = 0;
/*
* Check for any device re-ordering.
*/
if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
role = le32_to_cpu(sb2->array_position);
if (role != r->raid_disk) {
if (rs->raid_type->level != 1) {
rs->ti->error = "Cannot change device "
"positions in RAID array";
return -EINVAL;
}
DMINFO("RAID1 device #%d now at position #%d",
role, r->raid_disk);
}
/*
* Partial recovery is performed on
* returning failed devices.
*/
if (failed_devices & (1 << role))
set_bit(Faulty, &r->flags);
}
}
return 0;
}
static int super_validate(mddev_t *mddev, mdk_rdev_t *rdev)
{
struct dm_raid_superblock *sb = page_address(rdev->sb_page);
/*
* If mddev->events is not set, we know we have not yet initialized
* the array.
*/
if (!mddev->events && super_init_validation(mddev, rdev))
return -EINVAL;
mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */
rdev->mddev->bitmap_info.default_offset = 4096 >> 9;
if (!test_bit(FirstUse, &rdev->flags)) {
rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
if (rdev->recovery_offset != MaxSector)
clear_bit(In_sync, &rdev->flags);
}
/*
* If a device comes back, set it as not In_sync and no longer faulty.
*/
if (test_bit(Faulty, &rdev->flags)) {
clear_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
rdev->saved_raid_disk = rdev->raid_disk;
rdev->recovery_offset = 0;
}
clear_bit(FirstUse, &rdev->flags);
return 0;
}
/*
* Analyse superblocks and select the freshest.
*/
static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
{
int ret;
mdk_rdev_t *rdev, *freshest, *tmp;
mddev_t *mddev = &rs->md;
freshest = NULL;
rdev_for_each(rdev, tmp, mddev) {
if (!rdev->meta_bdev)
continue;
ret = super_load(rdev, freshest);
switch (ret) {
case 1:
freshest = rdev;
break;
case 0:
break;
default:
ti->error = "Failed to load superblock";
return ret;
}
}
if (!freshest)
return 0;
/*
* Validation of the freshest device provides the source of
* validation for the remaining devices.
*/
ti->error = "Unable to assemble array: Invalid superblocks";
if (super_validate(mddev, freshest))
return -EINVAL;
rdev_for_each(rdev, tmp, mddev)
if ((rdev != freshest) && super_validate(mddev, rdev))
return -EINVAL;
return 0;
}
/*
* Construct a RAID4/5/6 mapping:
* Args:
* <raid_type> <#raid_params> <raid_params> \
* <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> }
*
* ** metadata devices are not supported yet, use '-' instead **
*
* <raid_params> varies by <raid_type>. See 'parse_raid_params' for
* details on possible <raid_params>.
*/
@ -465,8 +962,12 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
if (ret)
goto bad;
rs->md.sync_super = super_sync;
ret = analyse_superblocks(ti, rs);
if (ret)
goto bad;
INIT_WORK(&rs->md.event_work, do_table_event);
ti->split_io = rs->md.chunk_sectors;
ti->private = rs;
mutex_lock(&rs->md.reconfig_mutex);
@ -482,6 +983,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
rs->callbacks.congested_fn = raid_is_congested;
dm_table_add_target_callbacks(ti->table, &rs->callbacks);
mddev_suspend(&rs->md);
return 0;
bad:
@ -546,12 +1048,17 @@ static int raid_status(struct dm_target *ti, status_type_t type,
break;
case STATUSTYPE_TABLE:
/* The string you would use to construct this array */
for (i = 0; i < rs->md.raid_disks; i++)
if (rs->dev[i].data_dev &&
for (i = 0; i < rs->md.raid_disks; i++) {
if ((rs->print_flags & DMPF_REBUILD) &&
rs->dev[i].data_dev &&
!test_bit(In_sync, &rs->dev[i].rdev.flags))
raid_param_cnt++; /* for rebuilds */
raid_param_cnt += 2; /* for rebuilds */
if (rs->dev[i].data_dev &&
test_bit(WriteMostly, &rs->dev[i].rdev.flags))
raid_param_cnt += 2;
}
raid_param_cnt += (hweight64(rs->print_flags) * 2);
raid_param_cnt += (hweight64(rs->print_flags & ~DMPF_REBUILD) * 2);
if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))
raid_param_cnt--;
@ -565,7 +1072,8 @@ static int raid_status(struct dm_target *ti, status_type_t type,
DMEMIT(" nosync");
for (i = 0; i < rs->md.raid_disks; i++)
if (rs->dev[i].data_dev &&
if ((rs->print_flags & DMPF_REBUILD) &&
rs->dev[i].data_dev &&
!test_bit(In_sync, &rs->dev[i].rdev.flags))
DMEMIT(" rebuild %u", i);
@ -579,6 +1087,11 @@ static int raid_status(struct dm_target *ti, status_type_t type,
if (rs->print_flags & DMPF_MAX_RECOVERY_RATE)
DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max);
for (i = 0; i < rs->md.raid_disks; i++)
if (rs->dev[i].data_dev &&
test_bit(WriteMostly, &rs->dev[i].rdev.flags))
DMEMIT(" write_mostly %u", i);
if (rs->print_flags & DMPF_MAX_WRITE_BEHIND)
DMEMIT(" max_write_behind %lu",
rs->md.bitmap_info.max_write_behind);
@ -591,9 +1104,16 @@ static int raid_status(struct dm_target *ti, status_type_t type,
conf ? conf->max_nr_stripes * 2 : 0);
}
if (rs->print_flags & DMPF_REGION_SIZE)
DMEMIT(" region_size %lu",
rs->md.bitmap_info.chunksize >> 9);
DMEMIT(" %d", rs->md.raid_disks);
for (i = 0; i < rs->md.raid_disks; i++) {
DMEMIT(" -"); /* metadata device */
if (rs->dev[i].meta_dev)
DMEMIT(" %s", rs->dev[i].meta_dev->name);
else
DMEMIT(" -");
if (rs->dev[i].data_dev)
DMEMIT(" %s", rs->dev[i].data_dev->name);
@ -650,12 +1170,13 @@ static void raid_resume(struct dm_target *ti)
{
struct raid_set *rs = ti->private;
bitmap_load(&rs->md);
mddev_resume(&rs->md);
}
static struct target_type raid_target = {
.name = "raid",
.version = {1, 0, 0},
.version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = raid_ctr,
.dtr = raid_dtr,

80
drivers/md/dm-snap-persistent.c
View File

@ -58,25 +58,30 @@
#define NUM_SNAPSHOT_HDR_CHUNKS 1
struct disk_header {
uint32_t magic;
__le32 magic;
/*
* Is this snapshot valid. There is no way of recovering
* an invalid snapshot.
*/
uint32_t valid;
__le32 valid;
/*
* Simple, incrementing version. no backward
* compatibility.
*/
uint32_t version;
__le32 version;
/* In sectors */
uint32_t chunk_size;
};
__le32 chunk_size;
} __packed;
struct disk_exception {
__le64 old_chunk;
__le64 new_chunk;
} __packed;
struct core_exception {
uint64_t old_chunk;
uint64_t new_chunk;
};
@ -169,10 +174,9 @@ static int alloc_area(struct pstore *ps)
if (!ps->area)
goto err_area;
ps->zero_area = vmalloc(len);
ps->zero_area = vzalloc(len);
if (!ps->zero_area)
goto err_zero_area;
memset(ps->zero_area, 0, len);
ps->header_area = vmalloc(len);
if (!ps->header_area)
@ -396,32 +400,32 @@ static struct disk_exception *get_exception(struct pstore *ps, uint32_t index)
}
static void read_exception(struct pstore *ps,
uint32_t index, struct disk_exception *result)
uint32_t index, struct core_exception *result)
{
struct disk_exception *e = get_exception(ps, index);
struct disk_exception *de = get_exception(ps, index);
/* copy it */
result->old_chunk = le64_to_cpu(e->old_chunk);
result->new_chunk = le64_to_cpu(e->new_chunk);
result->old_chunk = le64_to_cpu(de->old_chunk);
result->new_chunk = le64_to_cpu(de->new_chunk);
}
static void write_exception(struct pstore *ps,
uint32_t index, struct disk_exception *de)
uint32_t index, struct core_exception *e)
{
struct disk_exception *e = get_exception(ps, index);
struct disk_exception *de = get_exception(ps, index);
/* copy it */
e->old_chunk = cpu_to_le64(de->old_chunk);
e->new_chunk = cpu_to_le64(de->new_chunk);
de->old_chunk = cpu_to_le64(e->old_chunk);
de->new_chunk = cpu_to_le64(e->new_chunk);
}
static void clear_exception(struct pstore *ps, uint32_t index)
{
struct disk_exception *e = get_exception(ps, index);
struct disk_exception *de = get_exception(ps, index);
/* clear it */
e->old_chunk = 0;
e->new_chunk = 0;
de->old_chunk = 0;
de->new_chunk = 0;
}
/*
@ -437,13 +441,13 @@ static int insert_exceptions(struct pstore *ps,
{
int r;
unsigned int i;
struct disk_exception de;
struct core_exception e;
/* presume the area is full */
*full = 1;
for (i = 0; i < ps->exceptions_per_area; i++) {
read_exception(ps, i, &de);
read_exception(ps, i, &e);
/*
* If the new_chunk is pointing at the start of
@ -451,7 +455,7 @@ static int insert_exceptions(struct pstore *ps,
* is we know that we've hit the end of the
* exceptions. Therefore the area is not full.
*/
if (de.new_chunk == 0LL) {
if (e.new_chunk == 0LL) {
ps->current_committed = i;
*full = 0;
break;
@ -460,13 +464,13 @@ static int insert_exceptions(struct pstore *ps,
/*
* Keep track of the start of the free chunks.
*/
if (ps->next_free <= de.new_chunk)
ps->next_free = de.new_chunk + 1;
if (ps->next_free <= e.new_chunk)
ps->next_free = e.new_chunk + 1;
/*
* Otherwise we add the exception to the snapshot.
*/
r = callback(callback_context, de.old_chunk, de.new_chunk);
r = callback(callback_context, e.old_chunk, e.new_chunk);
if (r)
return r;
}
@ -563,7 +567,7 @@ static int persistent_read_metadata(struct dm_exception_store *store,
ps->exceptions_per_area = (ps->store->chunk_size << SECTOR_SHIFT) /
sizeof(struct disk_exception);
ps->callbacks = dm_vcalloc(ps->exceptions_per_area,
sizeof(*ps->callbacks));
sizeof(*ps->callbacks));
if (!ps->callbacks)
return -ENOMEM;
@ -641,12 +645,12 @@ static void persistent_commit_exception(struct dm_exception_store *store,
{
unsigned int i;
struct pstore *ps = get_info(store);
struct disk_exception de;
struct core_exception ce;
struct commit_callback *cb;
de.old_chunk = e->old_chunk;
de.new_chunk = e->new_chunk;
write_exception(ps, ps->current_committed++, &de);
ce.old_chunk = e->old_chunk;
ce.new_chunk = e->new_chunk;
write_exception(ps, ps->current_committed++, &ce);
/*
* Add the callback to the back of the array. This code
@ -670,7 +674,7 @@ static void persistent_commit_exception(struct dm_exception_store *store,
* If we completely filled the current area, then wipe the next one.
*/
if ((ps->current_committed == ps->exceptions_per_area) &&
zero_disk_area(ps, ps->current_area + 1))
zero_disk_area(ps, ps->current_area + 1))
ps->valid = 0;
/*
@ -701,7 +705,7 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
chunk_t *last_new_chunk)
{
struct pstore *ps = get_info(store);
struct disk_exception de;
struct core_exception ce;
int nr_consecutive;
int r;
@ -722,9 +726,9 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
ps->current_committed = ps->exceptions_per_area;
}
read_exception(ps, ps->current_committed - 1, &de);
*last_old_chunk = de.old_chunk;
*last_new_chunk = de.new_chunk;
read_exception(ps, ps->current_committed - 1, &ce);
*last_old_chunk = ce.old_chunk;
*last_new_chunk = ce.new_chunk;
/*
* Find number of consecutive chunks within the current area,
@ -733,9 +737,9 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
for (nr_consecutive = 1; nr_consecutive < ps->current_committed;
nr_consecutive++) {
read_exception(ps, ps->current_committed - 1 - nr_consecutive,
&de);
if (de.old_chunk != *last_old_chunk - nr_consecutive ||
de.new_chunk != *last_new_chunk - nr_consecutive)
&ce);
if (ce.old_chunk != *last_old_chunk - nr_consecutive ||
ce.new_chunk != *last_new_chunk - nr_consecutive)
break;
}
@ -753,7 +757,7 @@ static int persistent_commit_merge(struct dm_exception_store *store,
for (i = 0; i < nr_merged; i++)
clear_exception(ps, ps->current_committed - 1 - i);
r = area_io(ps, WRITE);
r = area_io(ps, WRITE_FLUSH_FUA);
if (r < 0)
return r;

84
drivers/md/dm-snap.c
View File

@ -29,16 +29,6 @@ static const char dm_snapshot_merge_target_name[] = "snapshot-merge";
#define dm_target_is_snapshot_merge(ti) \
((ti)->type->name == dm_snapshot_merge_target_name)
/*
* The percentage increment we will wake up users at
*/
#define WAKE_UP_PERCENT 5
/*
* kcopyd priority of snapshot operations
*/
#define SNAPSHOT_COPY_PRIORITY 2
/*
* The size of the mempool used to track chunks in use.
*/
@ -180,6 +170,13 @@ struct dm_snap_pending_exception {
* kcopyd.
*/
int started;
/*
* For writing a complete chunk, bypassing the copy.
*/
struct bio *full_bio;
bio_end_io_t *full_bio_end_io;
void *full_bio_private;
};
/*
@ -1055,8 +1052,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s) {
ti->error = "Cannot allocate snapshot context private "
"structure";
ti->error = "Cannot allocate private snapshot structure";
r = -ENOMEM;
goto bad;
}
@ -1380,6 +1376,7 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
struct dm_snapshot *s = pe->snap;
struct bio *origin_bios = NULL;
struct bio *snapshot_bios = NULL;
struct bio *full_bio = NULL;
int error = 0;
if (!success) {
@ -1415,10 +1412,15 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
*/
dm_insert_exception(&s->complete, e);
out:
out:
dm_remove_exception(&pe->e);
snapshot_bios = bio_list_get(&pe->snapshot_bios);
origin_bios = bio_list_get(&pe->origin_bios);
full_bio = pe->full_bio;
if (full_bio) {
full_bio->bi_end_io = pe->full_bio_end_io;
full_bio->bi_private = pe->full_bio_private;
}
free_pending_exception(pe);
increment_pending_exceptions_done_count();
@ -1426,10 +1428,15 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
up_write(&s->lock);
/* Submit any pending write bios */
if (error)
if (error) {
if (full_bio)
bio_io_error(full_bio);
error_bios(snapshot_bios);
else
} else {
if (full_bio)
bio_endio(full_bio, 0);
flush_bios(snapshot_bios);
}
retry_origin_bios(s, origin_bios);
}
@ -1480,8 +1487,33 @@ static void start_copy(struct dm_snap_pending_exception *pe)
dest.count = src.count;
/* Hand over to kcopyd */
dm_kcopyd_copy(s->kcopyd_client,
&src, 1, &dest, 0, copy_callback, pe);
dm_kcopyd_copy(s->kcopyd_client, &src, 1, &dest, 0, copy_callback, pe);
}
static void full_bio_end_io(struct bio *bio, int error)
{
void *callback_data = bio->bi_private;
dm_kcopyd_do_callback(callback_data, 0, error ? 1 : 0);
}
static void start_full_bio(struct dm_snap_pending_exception *pe,
struct bio *bio)
{
struct dm_snapshot *s = pe->snap;
void *callback_data;
pe->full_bio = bio;
pe->full_bio_end_io = bio->bi_end_io;
pe->full_bio_private = bio->bi_private;
callback_data = dm_kcopyd_prepare_callback(s->kcopyd_client,
copy_callback, pe);
bio->bi_end_io = full_bio_end_io;
bio->bi_private = callback_data;
generic_make_request(bio);
}
static struct dm_snap_pending_exception *
@ -1519,6 +1551,7 @@ __find_pending_exception(struct dm_snapshot *s,
bio_list_init(&pe->origin_bios);
bio_list_init(&pe->snapshot_bios);
pe->started = 0;
pe->full_bio = NULL;
if (s->store->type->prepare_exception(s->store, &pe->e)) {
free_pending_exception(pe);
@ -1612,10 +1645,19 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
}
remap_exception(s, &pe->e, bio, chunk);
bio_list_add(&pe->snapshot_bios, bio);
r = DM_MAPIO_SUBMITTED;
if (!pe->started &&
bio->bi_size == (s->store->chunk_size << SECTOR_SHIFT)) {
pe->started = 1;
up_write(&s->lock);
start_full_bio(pe, bio);
goto out;
}
bio_list_add(&pe->snapshot_bios, bio);
if (!pe->started) {
/* this is protected by snap->lock */
pe->started = 1;
@ -1628,9 +1670,9 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
map_context->ptr = track_chunk(s, chunk);
}
out_unlock:
out_unlock:
up_write(&s->lock);
out:
out:
return r;
}
@ -1974,7 +2016,7 @@ static int __origin_write(struct list_head *snapshots, sector_t sector,
pe_to_start_now = pe;
}
next_snapshot:
next_snapshot:
up_write(&snap->lock);
if (pe_to_start_now) {

155
drivers/md/dm-table.c
View File

@ -54,7 +54,6 @@ struct dm_table {
sector_t *highs;
struct dm_target *targets;
unsigned discards_supported:1;
unsigned integrity_supported:1;
/*
@ -154,12 +153,11 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size)
return NULL;
size = nmemb * elem_size;
addr = vmalloc(size);
if (addr)
memset(addr, 0, size);
addr = vzalloc(size);
return addr;
}
EXPORT_SYMBOL(dm_vcalloc);
/*
* highs, and targets are managed as dynamic arrays during a
@ -209,7 +207,6 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
INIT_LIST_HEAD(&t->devices);
INIT_LIST_HEAD(&t->target_callbacks);
atomic_set(&t->holders, 0);
t->discards_supported = 1;
if (!num_targets)
num_targets = KEYS_PER_NODE;
@ -281,6 +278,7 @@ void dm_table_get(struct dm_table *t)
{
atomic_inc(&t->holders);
}
EXPORT_SYMBOL(dm_table_get);
void dm_table_put(struct dm_table *t)
{
@ -290,6 +288,7 @@ void dm_table_put(struct dm_table *t)
smp_mb__before_atomic_dec();
atomic_dec(&t->holders);
}
EXPORT_SYMBOL(dm_table_put);
/*
* Checks to see if we need to extend highs or targets.
@ -455,13 +454,14 @@ static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode,
* Add a device to the list, or just increment the usage count if
* it's already present.
*/
static int __table_get_device(struct dm_table *t, struct dm_target *ti,
const char *path, fmode_t mode, struct dm_dev **result)
int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
struct dm_dev **result)
{
int r;
dev_t uninitialized_var(dev);
struct dm_dev_internal *dd;
unsigned int major, minor;
struct dm_table *t = ti->table;
BUG_ON(!t);
@ -509,6 +509,7 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
*result = &dd->dm_dev;
return 0;
}
EXPORT_SYMBOL(dm_get_device);
int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
@ -539,23 +540,15 @@ int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
* If not we'll force DM to use PAGE_SIZE or
* smaller I/O, just to be safe.
*/
if (q->merge_bvec_fn && !ti->type->merge)
if (dm_queue_merge_is_compulsory(q) && !ti->type->merge)
blk_limits_max_hw_sectors(limits,
(unsigned int) (PAGE_SIZE >> 9));
return 0;
}
EXPORT_SYMBOL_GPL(dm_set_device_limits);
int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
struct dm_dev **result)
{
return __table_get_device(ti->table, ti, path, mode, result);
}
/*
* Decrement a devices use count and remove it if necessary.
* Decrement a device's use count and remove it if necessary.
*/
void dm_put_device(struct dm_target *ti, struct dm_dev *d)
{
@ -568,6 +561,7 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d)
kfree(dd);
}
}
EXPORT_SYMBOL(dm_put_device);
/*
* Checks to see if the target joins onto the end of the table.
@ -791,8 +785,9 @@ int dm_table_add_target(struct dm_table *t, const char *type,
t->highs[t->num_targets++] = tgt->begin + tgt->len - 1;
if (!tgt->num_discard_requests)
t->discards_supported = 0;
if (!tgt->num_discard_requests && tgt->discards_supported)
DMWARN("%s: %s: ignoring discards_supported because num_discard_requests is zero.",
dm_device_name(t->md), type);
return 0;
@ -802,6 +797,63 @@ int dm_table_add_target(struct dm_table *t, const char *type,
return r;
}
/*
* Target argument parsing helpers.
*/
static int validate_next_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *value, char **error, unsigned grouped)
{
const char *arg_str = dm_shift_arg(arg_set);
if (!arg_str ||
(sscanf(arg_str, "%u", value) != 1) ||
(*value < arg->min) ||
(*value > arg->max) ||
(grouped && arg_set->argc < *value)) {
*error = arg->error;
return -EINVAL;
}
return 0;
}
int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *value, char **error)
{
return validate_next_arg(arg, arg_set, value, error, 0);
}
EXPORT_SYMBOL(dm_read_arg);
int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *value, char **error)
{
return validate_next_arg(arg, arg_set, value, error, 1);
}
EXPORT_SYMBOL(dm_read_arg_group);
const char *dm_shift_arg(struct dm_arg_set *as)
{
char *r;
if (as->argc) {
as->argc--;
r = *as->argv;
as->argv++;
return r;
}
return NULL;
}
EXPORT_SYMBOL(dm_shift_arg);
void dm_consume_args(struct dm_arg_set *as, unsigned num_args)
{
BUG_ON(as->argc < num_args);
as->argc -= num_args;
as->argv += num_args;
}
EXPORT_SYMBOL(dm_consume_args);
static int dm_table_set_type(struct dm_table *t)
{
unsigned i;
@ -1077,11 +1129,13 @@ void dm_table_event(struct dm_table *t)
t->event_fn(t->event_context);
mutex_unlock(&_event_lock);
}
EXPORT_SYMBOL(dm_table_event);
sector_t dm_table_get_size(struct dm_table *t)
{
return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0;
}
EXPORT_SYMBOL(dm_table_get_size);
struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index)
{
@ -1194,9 +1248,45 @@ static void dm_table_set_integrity(struct dm_table *t)
blk_get_integrity(template_disk));
}
static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
unsigned flush = (*(unsigned *)data);
struct request_queue *q = bdev_get_queue(dev->bdev);
return q && (q->flush_flags & flush);
}
static bool dm_table_supports_flush(struct dm_table *t, unsigned flush)
{
struct dm_target *ti;
unsigned i = 0;
/*
* Require at least one underlying device to support flushes.
* t->devices includes internal dm devices such as mirror logs
* so we need to use iterate_devices here, which targets
* supporting flushes must provide.
*/
while (i < dm_table_get_num_targets(t)) {
ti = dm_table_get_target(t, i++);
if (!ti->num_flush_requests)
continue;
if (ti->type->iterate_devices &&
ti->type->iterate_devices(ti, device_flush_capable, &flush))
return 1;
}
return 0;
}
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
unsigned flush = 0;
/*
* Copy table's limits to the DM device's request_queue
*/
@ -1207,6 +1297,13 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
else
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
if (dm_table_supports_flush(t, REQ_FLUSH)) {
flush |= REQ_FLUSH;
if (dm_table_supports_flush(t, REQ_FUA))
flush |= REQ_FUA;
}
blk_queue_flush(q, flush);
dm_table_set_integrity(t);
/*
@ -1237,6 +1334,7 @@ fmode_t dm_table_get_mode(struct dm_table *t)
{
return t->mode;
}
EXPORT_SYMBOL(dm_table_get_mode);
static void suspend_targets(struct dm_table *t, unsigned postsuspend)
{
@ -1345,6 +1443,7 @@ struct mapped_device *dm_table_get_md(struct dm_table *t)
{
return t->md;
}
EXPORT_SYMBOL(dm_table_get_md);
static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
@ -1359,19 +1458,19 @@ bool dm_table_supports_discards(struct dm_table *t)
struct dm_target *ti;
unsigned i = 0;
if (!t->discards_supported)
return 0;
/*
* Unless any target used by the table set discards_supported,
* require at least one underlying device to support discards.
* t->devices includes internal dm devices such as mirror logs
* so we need to use iterate_devices here, which targets
* supporting discard must provide.
* supporting discard selectively must provide.
*/
while (i < dm_table_get_num_targets(t)) {
ti = dm_table_get_target(t, i++);
if (!ti->num_discard_requests)
continue;
if (ti->discards_supported)
return 1;
@ -1382,13 +1481,3 @@ bool dm_table_supports_discards(struct dm_table *t)
return 0;
}
EXPORT_SYMBOL(dm_vcalloc);
EXPORT_SYMBOL(dm_get_device);
EXPORT_SYMBOL(dm_put_device);
EXPORT_SYMBOL(dm_table_event);
EXPORT_SYMBOL(dm_table_get_size);
EXPORT_SYMBOL(dm_table_get_mode);
EXPORT_SYMBOL(dm_table_get_md);
EXPORT_SYMBOL(dm_table_put);
EXPORT_SYMBOL(dm_table_get);

75
drivers/md/dm.c
View File

@ -37,6 +37,8 @@ static const char *_name = DM_NAME;
static unsigned int major = 0;
static unsigned int _major = 0;
static DEFINE_IDR(_minor_idr);
static DEFINE_SPINLOCK(_minor_lock);
/*
* For bio-based dm.
@ -109,6 +111,7 @@ EXPORT_SYMBOL_GPL(dm_get_rq_mapinfo);
#define DMF_FREEING 3
#define DMF_DELETING 4
#define DMF_NOFLUSH_SUSPENDING 5
#define DMF_MERGE_IS_OPTIONAL 6
/*
* Work processed by per-device workqueue.
@ -313,6 +316,12 @@ static void __exit dm_exit(void)
while (i--)
_exits[i]();
/*
* Should be empty by this point.
*/
idr_remove_all(&_minor_idr);
idr_destroy(&_minor_idr);
}
/*
@ -1171,7 +1180,8 @@ static int __clone_and_map_discard(struct clone_info *ci)
/*
* Even though the device advertised discard support,
* reconfiguration might have changed that since the
* that does not mean every target supports it, and
* reconfiguration might also have changed that since the
* check was performed.
*/
if (!ti->num_discard_requests)
@ -1705,8 +1715,6 @@ static int dm_any_congested(void *congested_data, int bdi_bits)
/*-----------------------------------------------------------------
* An IDR is used to keep track of allocated minor numbers.
*---------------------------------------------------------------*/
static DEFINE_IDR(_minor_idr);
static void free_minor(int minor)
{
spin_lock(&_minor_lock);
@ -1800,7 +1808,6 @@ static void dm_init_md_queue(struct mapped_device *md)
blk_queue_make_request(md->queue, dm_request);
blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
blk_queue_merge_bvec(md->queue, dm_merge_bvec);
blk_queue_flush(md->queue, REQ_FLUSH | REQ_FUA);
}
/*
@ -1985,6 +1992,59 @@ static void __set_size(struct mapped_device *md, sector_t size)
i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
}
/*
* Return 1 if the queue has a compulsory merge_bvec_fn function.
*
* If this function returns 0, then the device is either a non-dm
* device without a merge_bvec_fn, or it is a dm device that is
* able to split any bios it receives that are too big.
*/
int dm_queue_merge_is_compulsory(struct request_queue *q)
{
struct mapped_device *dev_md;
if (!q->merge_bvec_fn)
return 0;
if (q->make_request_fn == dm_request) {
dev_md = q->queuedata;
if (test_bit(DMF_MERGE_IS_OPTIONAL, &dev_md->flags))
return 0;
}
return 1;
}
static int dm_device_merge_is_compulsory(struct dm_target *ti,
struct dm_dev *dev, sector_t start,
sector_t len, void *data)
{
struct block_device *bdev = dev->bdev;
struct request_queue *q = bdev_get_queue(bdev);
return dm_queue_merge_is_compulsory(q);
}
/*
* Return 1 if it is acceptable to ignore merge_bvec_fn based
* on the properties of the underlying devices.
*/
static int dm_table_merge_is_optional(struct dm_table *table)
{
unsigned i = 0;
struct dm_target *ti;
while (i < dm_table_get_num_targets(table)) {
ti = dm_table_get_target(table, i++);
if (ti->type->iterate_devices &&
ti->type->iterate_devices(ti, dm_device_merge_is_compulsory, NULL))
return 0;
}
return 1;
}
/*
* Returns old map, which caller must destroy.
*/
@ -1995,6 +2055,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
struct request_queue *q = md->queue;
sector_t size;
unsigned long flags;
int merge_is_optional;
size = dm_table_get_size(t);
@ -2020,10 +2081,16 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
__bind_mempools(md, t);
merge_is_optional = dm_table_merge_is_optional(t);
write_lock_irqsave(&md->map_lock, flags);
old_map = md->map;
md->map = t;
dm_table_set_restrictions(t, q, limits);
if (merge_is_optional)
set_bit(DMF_MERGE_IS_OPTIONAL, &md->flags);
else
clear_bit(DMF_MERGE_IS_OPTIONAL, &md->flags);
write_unlock_irqrestore(&md->map_lock, flags);
return old_map;

2
drivers/md/dm.h
View File

@ -66,6 +66,8 @@ int dm_table_alloc_md_mempools(struct dm_table *t);
void dm_table_free_md_mempools(struct dm_table *t);
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
int dm_queue_merge_is_compulsory(struct request_queue *q);
void dm_lock_md_type(struct mapped_device *md);
void dm_unlock_md_type(struct mapped_device *md);
void dm_set_md_type(struct mapped_device *md, unsigned type);

43
include/linux/device-mapper.h
View File

@ -208,6 +208,49 @@ struct dm_target_callbacks {
int dm_register_target(struct target_type *t);
void dm_unregister_target(struct target_type *t);
/*
* Target argument parsing.
*/
struct dm_arg_set {
unsigned argc;
char **argv;
};
/*
* The minimum and maximum value of a numeric argument, together with
* the error message to use if the number is found to be outside that range.
*/
struct dm_arg {
unsigned min;
unsigned max;
char *error;
};
/*
* Validate the next argument, either returning it as *value or, if invalid,
* returning -EINVAL and setting *error.
*/
int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *value, char **error);
/*
* Process the next argument as the start of a group containing between
* arg->min and arg->max further arguments. Either return the size as
* *num_args or, if invalid, return -EINVAL and set *error.
*/
int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set,
unsigned *num_args, char **error);
/*
* Return the current argument and shift to the next.
*/
const char *dm_shift_arg(struct dm_arg_set *as);
/*
* Move through num_args arguments.
*/
void dm_consume_args(struct dm_arg_set *as, unsigned num_args);
/*-----------------------------------------------------------------
* Functions for creating and manipulating mapped devices.
* Drop the reference with dm_put when you finish with the object.

4
include/linux/dm-ioctl.h
View File

@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 20
#define DM_VERSION_MINOR 21
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2011-02-02)"
#define DM_VERSION_EXTRA "-ioctl (2011-07-06)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */

15
include/linux/dm-kcopyd.h
View File

@ -42,5 +42,20 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
unsigned num_dests, struct dm_io_region *dests,
unsigned flags, dm_kcopyd_notify_fn fn, void *context);
/*
* Prepare a callback and submit it via the kcopyd thread.
*
* dm_kcopyd_prepare_callback allocates a callback structure and returns it.
* It must not be called from interrupt context.
* The returned value should be passed into dm_kcopyd_do_callback.
*
* dm_kcopyd_do_callback submits the callback.
* It may be called from interrupt context.
* The callback is issued from the kcopyd thread.
*/
void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc,
dm_kcopyd_notify_fn fn, void *context);
void dm_kcopyd_do_callback(void *job, int read_err, unsigned long write_err);
#endif /* __KERNEL__ */
#endif /* _LINUX_DM_KCOPYD_H */