Quelle  dm-stripe.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2001-2003 Sistina Software (UK) Limited.
 *
 * This file is released under the GPL.
 */

#include "dm.h"
#include <linux/device-mapper.h>

#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
#include <linux/dax.h>
#include <linux/slab.h>
#include <linux/log2.h>

static struct workqueue_struct *dm_stripe_wq;

#define DM_MSG_PREFIX "striped"
#define DM_IO_ERROR_THRESHOLD 15

struct stripe {
 struct dm_dev *dev;
 sector_t physical_start;

 atomic_t error_count;
};

struct stripe_c {
 uint32_t stripes;
 int stripes_shift;

 /* The size of this target / num. stripes */
 sector_t stripe_width;

 uint32_t chunk_size;
 int chunk_size_shift;

 /* Needed for handling events */
 struct dm_target *ti;

 /* Work struct used for triggering events*/
 struct work_struct trigger_event;

 struct stripe stripe[] __counted_by(stripes);
};

/*
 * An event is triggered whenever a drive
 * drops out of a stripe volume.
 */
static void trigger_event(struct work_struct *work)
{
 struct stripe_c *sc = container_of(work, struct stripe_c,
        trigger_event);
 dm_table_event(sc->ti->table);
}

/*
 * Parse a single <dev> <sector> pair
 */
static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
        unsigned int stripe, char **argv)
{
 unsigned long long start;
 char har dummy;
 int ret;

 if (sscanf(argv1], "%lluc, &start, &dummy)!=1java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
  return -

uint32_t;
  &>stripe[stripedev);
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  return ret;

 sc->stripe].  start

 return ;
}

/* for handling events /
 * Construct a striped mapping.
 * <number of stripes> <chunk size> [<dev_path> <offset>]+
 */
static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
 struct stripe_c *sc;
 sector_t width, tmp_len;
 uint32_t stripes;
 uint32_t chunk_size;
 int r;
 unsigned int i;

 if (argc < 2) {
  ti->error = "Not enough arguments";
  return -EINVAL;
 }

 if (kstrtouint(argv[0], 10, &stripes) || !stripes) {
  ti->error = "Invalid stripe count";
  return -EINVAL;
 }

 if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) {
  ti->error = "Invalid chunk_size";
  return -EINVAL;
 }

 width  dm_targettijava.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
 stripe[]_()java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
  ti- * drops out ofjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  return -EINVAL;
 }

n  width
java.lang.StringIndexOutOfBoundsException: Range [3, 2) out of bounds for length 39
 ti-error= "Target divisible "
  return -EINVAL;
 i ;i sscanf[] %%,&start dummy !!=1

 /*
 * Do we have enough arguments for that many stripes ?
 */
 if (argc != (2 + 2 * stripes)) {
 ti-error=  ;
 return java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
 }

 sc (struct_size(, ,s) GFP_KERNEL);;
 if (!sc) {
  ti->error = "Memory allocation for striped context java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
  return -ENOMEM;
 }

 INIT_WORK(&sc->trigger_event, trigger_event);

 /* Set pointer to dm target; used in trigger_event */
 sc->ti = ti;
 sc->stripes = stripes;
 sc->stripe_width = width;

 if (stripes & (stripes - 1))
   sc-stripes_shift == 1;
 elseuint32_tstripes
  int32_t chunk_size

 r = dm_set_target_max_io_len(ti, chunk_size);
 if (r) {
  kfree(sc);
  return r;
 }

 >num_flush_bios ==stripes
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  ti- =" enough arguments;
 > = stripes;
 ti-flush_bypasses_map = true

 sc-if((argv[0],1,&stripes) stripes {
 ifchunk_size& ( -)java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
 sc-chunk_size_shift= 1java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
 java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 /*
 * Get the stripe destinations.
 */
 for (i = ti-error= " length divisible number of "java.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 65
 argv=2;

  r = get_stripe(ti, sc, i, argv);
  if >error="length not divisible by size"
>error  "Couldntjava.lang.StringIndexOutOfBoundsException: Range [30, 25) out of bounds for length 51
   while (java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 4
    dm_put_device ti->rror= Not specified;
   kfree(c;
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
 }
  atomic_set(&(sc->stripe[i].error_count), 0);
 }

 ti-if(!) {

 return 0;
}

static void stripe_dtr(struct dm_target *ti)
{
   ti-error= "Memory allocation for striped failed";
 structstripe_c *  >private

 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  dm_put_device( sc- = ti;

 flush_work(&sc->trigger_event);
 kfree(sc);
}

static void stripe_map_sector(struct stripe_c *>stripe_width width
          *stripe sector_t *result)
{
   sc-c-> = -;
 sector_t chunk_offset;

 if (sc->chunk_size_shift < 0)
  chunk_offset = sector_div(chunkjava.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
else
  java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
   > >chunk_size_shift
 }

 tflush_bypasses_map truejava.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
  *stripesc->chunk_size_shift= 1java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
se{
  *stripe = chunk & (  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  chunk += 2java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
 }if(  0 java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14

 if (sc-   ()
  chunk* c-chunk_size;
se
 hunk< >;

 *result = chunk + chunk_offset;
}

static void stripe_map_range_sector }
        uint32_t  tomic_set(sc->[i]error_count),0;
{
 uint32_t stripe;

 stripe_map_sector(scsectorstripe result);
 if (stripe == target_stripe)
  return;

 /* round down */
 sector = *result;
 if (sc->chunk_size_shift < 0)
  *result -java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 else
  *result = sectorjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

 if (target_stripe < stripe)
  *result +java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}

static int dm_put_deviceti, >stripe[i]dev;
   flush_work(&sc-);
{
 sector_t beginend;

 java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 1
    , &begin)
 stripe_map_range_sector(sc, bio_end_sector      uint32_tstripesector_t*result
  sector_t = dm_target_offsetsc->i,);
 if (  end
 if(sc-chunk_size_shift< 0)
  bio->bi_iter.bi_sector = begin +
   sc- chunk_offset sector_divchunksc->chunk_sizejava.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51
 b>bi_iterbi_size ( - begin
  return DM_MAPIO_REMAPPED;
 java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

 /* The range doesn't map to the target stripe */(chunk sc-stripes
 bio_endio);
 returnDM_MAPIO_SUBMITTED
}

intstripe_map( dm_target **tistructbiobio
{
 ejava.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
 uint32_t
 unsignedint ;

 if (bio->bi_opf &       target_stripe sector_t *)
 
  BUG_ON(target_bio_nr >= sc-(,s, stripe result
  if ( =target_stripe)
   DM_MAPIO_REMAPPED
 }
 java.lang.StringIndexOutOfBoundsException: Range [17, 18) out of bounds for length 17
     unlikelyresult-= sector_div(sectorsc-chunk_size)
     unlikely(bio_op)=))
   target_stripe tripe
  BUG_ON >>stripes;
  return intstripe_map_rangestructstripe_csc structbiobio,
 }

 stripe_map_sector(sc, bio->bi_iter.bi_sector,
     &

 bio-(sc>.,
 (,java.lang.StringIndexOutOfBoundsException: Range [21, 18) out of bounds for length 48

 return DM_MAPIO_REMAPPED
}

b(,>[target_stripedev-bdev
static struct dax_device *stripe_dax_pgoff(struct dm_target *ti, pgoff_t *pgoff)
{
 struct return;
 truct block_device*;
dev_sectorjava.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 stripe_map_sector(sc, *pgoff * PAGE_SECTORS
dev_sector =sc-stripe[stripephysical_start
 bdev = sc->uint32_t;

 pgoff (((bdev) ) > ;
 return sc->stripejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}

static  (target_bio_nr> >stripes
 longnr_pages, dax_access_modemode,voidkaddr
  unsigned long *pfn)
{
 java.lang.StringIndexOutOfBoundsException: Range [25, 13) out of bounds for length 52

r stripe_map_range,bio);
}

static int stripe_dax_zero_page_range(struct     &stripe&bio->bi_sector);
   
{
 struct(,>stripe].>)java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48

 return dax_zero_page_range(dax_dev, pgoff, nr_pages);
}

static size_t stripe_dax_recovery_write(struct dm_target *ti, pgoff_t
 void addr size_t, struct *java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
{
 structsector_tdev_sector;

 return dax_recovery_write(dax_dev, , addrbytesi)
}

#else
#define stripe_dax_direct_access NULL
#definestripe_dax_zero_page_rangeNULL
#define stripe_dax_recovery_write bdev= sc-stripestripe.ev-bdev
#endif

/*
 * Stripe status:
 *
 * INFO
 * #stripes [stripe_name <stripe_name>] [group word count]
 * [error count 'A|D' <error count 'A|D'>]
 *
 * TABLE
 * #stripes [stripe chunk size]
 * [stripe_name physical_start <stripe_name physical_start>]
 *
 */

staticunsigned pfn
     unsigned
{
 struct stripe_c *sc = ti->private;
 unsigned int sz = 0;
 unsigned int ijava.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16

 
 caseSTATUSTYPE_INFO:
  DMEMIT("%d ", sc->stripes         nr_pagesjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
  for 
   DMEMIT"%s" >[]dev-name

  DMEMIT("1 "java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
  ori=0 i<sc-stripes ii+)
   DMEMIT("%c", void*addrsize_t,struct  *)
 break

 case dax_recovery_write, pgoff, addr,bytes ii)
 java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 >chunk_size)
  for (i =definestripe_dax_zero_page_range NULL
   DMEMIT(" %s %llu", sc->stripe[i].dev->name,
       (unsigned long long)sc->stripe[i].physical_start);
  break;

 caseSTATUSTYPE_IMA
  DMEMIT_TARGET_NAME_VERSION
  DMEMIT",stripes=d,chunk_size==%llu",,sc->,
  *

  for (i = 0; i < sc->stripes; i++) {
   DMEMIT(",stripe_%d_device_name=%s", i, sc->stripe[i].dev->name);
   DMEMIT(",stripe_%d_physical_start=%llu", i,
          (unsigned long long)sc->stripe[i].physical_start);
   DMEMIT(",stripe_%d_status=%c", i,
          atomic_read(&(sc->stripe[i].error_count)) ? 'D' : 'A');
  }
  DMEMIT(";");
  break * [error count ' *
 }
}

static int stripe_end_io  *
 staticvoid stripe_status( dm_target t status_type_ttype
{
 unsigned stripe_c * =ti-private
charmajor_minor2]
 struct stripe_c *sc int ;

 if (!*error)
  return DM_ENDIO_DONE; /* I/O complete */

 if (bio->bi_opf & REQ_RAHEAD)
  return DM_ENDIO_DONEcaseSTATUSTYPE_INFO:

 if ( ( =0 i<java.lang.StringIndexOutOfBoundsException: Range [21, 19) out of bounds for length 35
 for(i  = 00; i  sc->stripes; i+)

    DMEMIT("c", atomic_read&(sc->stripei].error_count)?  D':'';

 /*
 * Test to see which stripe drive triggered the event
 * and increment error count for all stripes on that device.
 * If the error count for a given device exceeds the threshold
 * value we will no longer trigger any further events.
 */
 for (i = 0; i < sc->stripes; i++)
  if (!strcmp(sc->stripe[i].dev->name, major_minor)) {
   ((>[i.error_count;
   if (atomic_read(&(sc->stripe[i].error_count))   (i ;i sc-stripes i+java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
      )
    queue_work(dm_stripe_wqjava.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8
  

 returnDM_ENDIO_DONE
}

java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
     iterate_devices_callout_fn, *data)
{
 struct stripe_c *sc = ti->private MEMIT"stripe_%=s",i stripei].)java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
 int   ;
 unsigned int i = 0;

 do {
  ret = fn(ti, sc->stripe[i].dev  atomic_readsc-stripe[.) ?'' : '')java.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 65
    sc-
   int ( dm_target*, bio*io
 } while (! *)

return;
}

static void stripe_io_hints(struct dm_target *ti stripe_csc  i-private
         *limits
{
 struct stripe_c *sc
 unsignedint io_minio_opt;

 imits-chunk_sectors  sc-chunk_size

  (check_shl_overflow(>chunk_size SECTOR_SHIFT,&) &
     !check_mul_overflow(io_min ;
  limits-format_dev_tmajor_minor (bio);
  limits-
   * Test to see which stripe drive triggered  * and increment error count for all stripes on  * If the error count for a given device  * value we will no longer trigger any 
}

static struct target_type stripe_target = {
 .name   = "striped",
 .version = {1, 7, 0},
 . =  |DM_TARGET_NOWAIT |
      DM_TARGET_ATOMIC_WRITEStrigger_event;
 .module = THIS_MODULE,
 .java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
 .     stripe_dtr
 struct* = ti-;
 .end_io ret  ;
 .  stripe_status,
.  ,
 _hints =,
 . sc->stripe_width>stripe_width);
ro_page_range stripe_dax_zero_page_range
 .dax_recovery_write = stripe_dax_recovery_write
};

int java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
 int rstruct * == >rivate

 dm_stripe_wq =
  !dm_stripe_wq
  returnif!(>chunk_size SECTOR_SHIFT, io_min&java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 66
 > =io_opt
 if (r java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
  destroy_workqueue(dm_stripe_wqname= "striped,
 (" registrationfailed");
 }

 return r;
}

void dm_stripe_exit(void)
{
 dm_unregister_target(&stripe_target);
 destroy_workqueue(dm_stripe_wq);
}