* Re: PATCH: killing read_ahead[]
[not found] <39F5999B.91DDC98@evision-ventures.com>
@ 2000-10-26 23:39 ` Jeff V. Merkey
2000-10-27 0:47 ` Jeff V. Merkey
0 siblings, 1 reply; 5+ messages in thread
From: Jeff V. Merkey @ 2000-10-26 23:39 UTC (permalink / raw)
To: Martin Dalecki; +Cc: linux-kernel, torvalds
Martin,
A lot of changes. Have you tested this adequately? Changes of this
magnitude this late in the 2.4 cycle could break a lot of stuff. I'll
apply your patch, and let you know.
:-)
Jeff
Martin Dalecki wrote:
>
> Hello!
>
> Please have a look at the following patch and feel free to be scared
> by the fact how UTTERLY BROKEN and ARBITRARY the current usage of the
> read_ahead[] array and during the whole past decade was!
> If you really care about clean internal interfaces this should be
> one of those prio number ONE targets to shoot at...
>
> The most amanzing thing is that the whole test10-pre5 kernel with this
> patch applied doesn't show any performance penalties for me at all!
> And of corse it's about 10k smaller...
>
> --mdcki
>
> ------------------------------------------------------------------------
> diff -ur linux-test10-pre5/arch/sparc64/kernel/ioctl32.c linux/arch/sparc64/kernel/ioctl32.c
> --- linux-test10-pre5/arch/sparc64/kernel/ioctl32.c Tue Oct 24 13:52:02 2000
> +++ linux/arch/sparc64/kernel/ioctl32.c Tue Oct 24 15:37:56 2000
> @@ -2136,7 +2136,7 @@
> uint32_t lv_badblock;
> uint32_t lv_allocation;
> uint32_t lv_io_timeout;
> - uint32_t lv_read_ahead;
> + uint32_t lv_NOT_USED;
> /* delta to version 1 starts here */
> u32 lv_snapshot_org;
> u32 lv_snapshot_prev;
> @@ -3100,7 +3100,6 @@
> COMPATIBLE_IOCTL(BLKROGET)
> COMPATIBLE_IOCTL(BLKRRPART)
> COMPATIBLE_IOCTL(BLKFLSBUF)
> -COMPATIBLE_IOCTL(BLKRASET)
> COMPATIBLE_IOCTL(BLKFRASET)
> COMPATIBLE_IOCTL(BLKSECTSET)
> COMPATIBLE_IOCTL(BLKSSZGET)
> @@ -3621,7 +3620,6 @@
> HANDLE_IOCTL(SIOCRTMSG, ret_einval)
> HANDLE_IOCTL(SIOCGSTAMP, do_siocgstamp)
> HANDLE_IOCTL(HDIO_GETGEO, hdio_getgeo)
> -HANDLE_IOCTL(BLKRAGET, w_long)
> HANDLE_IOCTL(BLKGETSIZE, w_long)
> HANDLE_IOCTL(0x1260, broken_blkgetsize)
> HANDLE_IOCTL(BLKFRAGET, w_long)
> diff -ur linux-test10-pre5/drivers/acorn/block/mfmhd.c linux/drivers/acorn/block/mfmhd.c
> --- linux-test10-pre5/drivers/acorn/block/mfmhd.c Wed Oct 4 01:39:44 2000
> +++ linux/drivers/acorn/block/mfmhd.c Tue Oct 24 15:35:40 2000
> @@ -1231,8 +1231,6 @@
> case BLKFLSBUF:
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKPG:
> return blk_ioctl(dev, cmd, arg);
>
> @@ -1448,7 +1446,6 @@
> hdc63463_irqpollmask = irqmask;
>
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB?) read ahread */
>
> #ifndef MODULE
> mfm_gendisk.next = gendisk_head;
> diff -ur linux-test10-pre5/drivers/block/DAC960.c linux/drivers/block/DAC960.c
> --- linux-test10-pre5/drivers/block/DAC960.c Tue Oct 24 13:52:03 2000
> +++ linux/drivers/block/DAC960.c Tue Oct 24 15:24:51 2000
> @@ -1931,10 +1931,7 @@
> Controller->GenericDiskInfo.sizes = Controller->PartitionSizes;
> blksize_size[MajorNumber] = Controller->BlockSizes;
> max_sectors[MajorNumber] = Controller->MaxSectorsPerRequest;
> - /*
> - Initialize Read Ahead to 128 sectors.
> - */
> - read_ahead[MajorNumber] = 128;
> +
> /*
> Complete initialization of the Generic Disk Information structure.
> */
> @@ -4964,16 +4961,6 @@
> return put_user(Controller->GenericDiskInfo.part[MINOR(Inode->i_rdev)]
> .nr_sects,
> (long *) Argument);
> - case BLKRAGET:
> - /* Get Read-Ahead. */
> - if ((long *) Argument == NULL) return -EINVAL;
> - return put_user(read_ahead[MAJOR(Inode->i_rdev)], (long *) Argument);
> - case BLKRASET:
> - /* Set Read-Ahead. */
> - if (!capable(CAP_SYS_ADMIN)) return -EACCES;
> - if (Argument > 256) return -EINVAL;
> - read_ahead[MAJOR(Inode->i_rdev)] = Argument;
> - return 0;
> case BLKFLSBUF:
> /* Flush Buffers. */
> if (!capable(CAP_SYS_ADMIN)) return -EACCES;
> diff -ur linux-test10-pre5/drivers/block/acsi.c linux/drivers/block/acsi.c
> --- linux-test10-pre5/drivers/block/acsi.c Thu Feb 17 00:42:05 2000
> +++ linux/drivers/block/acsi.c Tue Oct 24 15:24:13 2000
> @@ -1792,9 +1792,8 @@
> }
> phys_acsi_buffer = virt_to_phys( acsi_buffer );
> STramMask = ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 : 0xff000000;
> -
> +
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
> acsi_gendisk.next = gendisk_head;
> gendisk_head = &acsi_gendisk;
>
> diff -ur linux-test10-pre5/drivers/block/ataflop.c linux/drivers/block/ataflop.c
> --- linux-test10-pre5/drivers/block/ataflop.c Wed Jul 5 20:24:40 2000
> +++ linux/drivers/block/ataflop.c Tue Oct 24 15:33:40 2000
> @@ -1571,8 +1571,6 @@
> switch (cmd) {
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> return blk_ioctl(device, cmd, param);
> }
> diff -ur linux-test10-pre5/drivers/block/blkpg.c linux/drivers/block/blkpg.c
> --- linux-test10-pre5/drivers/block/blkpg.c Mon Mar 13 04:32:57 2000
> +++ linux/drivers/block/blkpg.c Tue Oct 24 15:29:31 2000
> @@ -29,7 +29,7 @@
> */
>
> #include <linux/errno.h>
> -#include <linux/fs.h> /* for BLKRASET, ... */
> +#include <linux/fs.h>
> #include <linux/sched.h> /* for capable() */
> #include <linux/blk.h> /* for set_device_ro() */
> #include <linux/blkpg.h>
> @@ -220,18 +220,6 @@
> case BLKROGET:
> intval = (is_read_only(dev) != 0);
> return put_user(intval, (int *)(arg));
> -
> - case BLKRASET:
> - if(!capable(CAP_SYS_ADMIN))
> - return -EACCES;
> - if(!dev || arg > 0xff)
> - return -EINVAL;
> - read_ahead[MAJOR(dev)] = arg;
> - return 0;
> - case BLKRAGET:
> - if (!arg)
> - return -EINVAL;
> - return put_user(read_ahead[MAJOR(dev)], (long *) arg);
>
> case BLKFLSBUF:
> if(!capable(CAP_SYS_ADMIN))
> diff -ur linux-test10-pre5/drivers/block/cciss.c linux/drivers/block/cciss.c
> --- linux-test10-pre5/drivers/block/cciss.c Tue Oct 24 13:52:03 2000
> +++ linux/drivers/block/cciss.c Tue Oct 24 15:34:14 2000
> @@ -395,8 +395,6 @@
> case BLKFLSBUF:
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKPG:
> return( blk_ioctl(inode->i_rdev, cmd, arg));
> case CCISS_GETPCIINFO:
> @@ -1841,7 +1839,6 @@
> /* fill in the other Kernel structs */
> blksize_size[MAJOR_NR+i] = hba[i]->blocksizes;
> hardsect_size[MAJOR_NR+i] = hba[i]->hardsizes;
> - read_ahead[MAJOR_NR+i] = READ_AHEAD;
>
> /* Fill in the gendisk data */
> hba[i]->gendisk.major = MAJOR_NR + i;
> diff -ur linux-test10-pre5/drivers/block/cpqarray.c linux/drivers/block/cpqarray.c
> --- linux-test10-pre5/drivers/block/cpqarray.c Tue Oct 24 13:52:03 2000
> +++ linux/drivers/block/cpqarray.c Tue Oct 24 15:33:53 2000
> @@ -503,7 +503,6 @@
> blk_queue_headactive(BLK_DEFAULT_QUEUE(MAJOR_NR + i), 0);
> blksize_size[MAJOR_NR+i] = ida_blocksizes + (i*256);
> hardsect_size[MAJOR_NR+i] = ida_hardsizes + (i*256);
> - read_ahead[MAJOR_NR+i] = READ_AHEAD;
>
> ida_gendisk[i].major = MAJOR_NR + i;
> ida_gendisk[i].major_name = "ida";
> @@ -1209,8 +1208,6 @@
> case BLKFLSBUF:
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKPG:
> return blk_ioctl(inode->i_rdev, cmd, arg);
>
> diff -ur linux-test10-pre5/drivers/block/floppy.c linux/drivers/block/floppy.c
> --- linux-test10-pre5/drivers/block/floppy.c Tue Oct 24 13:52:03 2000
> +++ linux/drivers/block/floppy.c Tue Oct 24 15:33:28 2000
> @@ -3455,8 +3455,6 @@
> switch (cmd) {
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> return blk_ioctl(device, cmd, param);
> }
> diff -ur linux-test10-pre5/drivers/block/ll_rw_blk.c linux/drivers/block/ll_rw_blk.c
> --- linux-test10-pre5/drivers/block/ll_rw_blk.c Tue Oct 24 13:52:03 2000
> +++ linux/drivers/block/ll_rw_blk.c Tue Oct 24 15:25:23 2000
> @@ -65,10 +65,6 @@
> */
> spinlock_t io_request_lock = SPIN_LOCK_UNLOCKED;
>
> -/* This specifies how many sectors to read ahead on the disk. */
> -
> -int read_ahead[MAX_BLKDEV];
> -
> /* blk_dev_struct is:
> * *request_fn
> * *current_request
> diff -ur linux-test10-pre5/drivers/block/paride/pcd.c linux/drivers/block/paride/pcd.c
> --- linux-test10-pre5/drivers/block/paride/pcd.c Wed Apr 5 04:25:14 2000
> +++ linux/drivers/block/paride/pcd.c Tue Oct 24 15:23:56 2000
> @@ -344,7 +344,6 @@
> if (PCD.present) register_cdrom(&PCD.info);
>
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read ahead */
>
> for (i=0;i<PCD_UNITS;i++) pcd_blocksizes[i] = 1024;
> blksize_size[MAJOR_NR] = pcd_blocksizes;
> diff -ur linux-test10-pre5/drivers/block/paride/pd.c linux/drivers/block/paride/pd.c
> --- linux-test10-pre5/drivers/block/paride/pd.c Tue Jun 20 16:24:52 2000
> +++ linux/drivers/block/paride/pd.c Tue Oct 24 15:34:00 2000
> @@ -453,8 +453,7 @@
> q->back_merge_fn = pd_back_merge_fn;
> q->front_merge_fn = pd_front_merge_fn;
> q->merge_requests_fn = pd_merge_requests_fn;
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read ahead */
> -
> +
> pd_gendisk.major = major;
> pd_gendisk.major_name = name;
> pd_gendisk.next = gendisk_head;
> @@ -543,8 +542,6 @@
> return pd_revalidate(inode->i_rdev);
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> case BLKPG:
> return blk_ioctl(inode->i_rdev, cmd, arg);
> diff -ur linux-test10-pre5/drivers/block/paride/pf.c linux/drivers/block/paride/pf.c
> --- linux-test10-pre5/drivers/block/paride/pf.c Wed Apr 5 04:25:14 2000
> +++ linux/drivers/block/paride/pf.c Tue Oct 24 15:34:06 2000
> @@ -413,8 +413,7 @@
> q->back_merge_fn = pf_back_merge_fn;
> q->front_merge_fn = pf_front_merge_fn;
> q->merge_requests_fn = pf_merge_requests_fn;
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read ahead */
> -
> +
> for (i=0;i<PF_UNITS;i++) pf_blocksizes[i] = 1024;
> blksize_size[MAJOR_NR] = pf_blocksizes;
> for (i=0;i<PF_UNITS;i++)
> @@ -491,8 +490,6 @@
> return (0);
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> return blk_ioctl(inode->i_rdev, cmd, arg);
> default:
> diff -ur linux-test10-pre5/drivers/block/ps2esdi.c linux/drivers/block/ps2esdi.c
> --- linux-test10-pre5/drivers/block/ps2esdi.c Fri Jul 14 21:20:22 2000
> +++ linux/drivers/block/ps2esdi.c Tue Oct 24 15:33:46 2000
> @@ -181,7 +181,6 @@
> }
> /* set up some global information - indicating device specific info */
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read ahead */
>
> /* some minor housekeeping - setup the global gendisk structure */
> ps2esdi_gendisk.next = gendisk_head;
> @@ -1153,8 +1152,6 @@
>
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> case BLKPG:
> return blk_ioctl(inode->i_rdev, cmd, arg);
> diff -ur linux-test10-pre5/drivers/block/xd.c linux/drivers/block/xd.c
> --- linux-test10-pre5/drivers/block/xd.c Tue Oct 24 13:52:03 2000
> +++ linux/drivers/block/xd.c Tue Oct 24 15:33:35 2000
> @@ -168,7 +168,6 @@
> }
> devfs_handle = devfs_mk_dir (NULL, xd_gendisk.major_name, NULL);
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read ahead */
> xd_gendisk.next = gendisk_head;
> gendisk_head = &xd_gendisk;
> xd_geninit();
> @@ -352,8 +351,6 @@
> case BLKFLSBUF:
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKPG:
> return blk_ioctl(inode->i_rdev, cmd, arg);
>
> @@ -1116,7 +1113,6 @@
> blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
> blk_size[MAJOR_NR] = NULL;
> hardsect_size[MAJOR_NR] = NULL;
> - read_ahead[MAJOR_NR] = 0;
> for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
> if (*gdp == &xd_gendisk)
> break;
> diff -ur linux-test10-pre5/drivers/cdrom/aztcd.c linux/drivers/cdrom/aztcd.c
> --- linux-test10-pre5/drivers/cdrom/aztcd.c Fri Jul 14 21:20:22 2000
> +++ linux/drivers/cdrom/aztcd.c Tue Oct 24 15:20:59 2000
> @@ -1803,7 +1803,6 @@
> #ifndef AZT_KERNEL_PRIOR_2_1
> blksize_size[MAJOR_NR] = aztcd_blocksizes;
> #endif
> - read_ahead[MAJOR_NR] = 4;
> register_disk(NULL, MKDEV(MAJOR_NR,0), 1, &azt_fops, 0);
>
> if ((azt_port==0x1f0)||(azt_port==0x170))
> diff -ur linux-test10-pre5/drivers/cdrom/cdu31a.c linux/drivers/cdrom/cdu31a.c
> --- linux-test10-pre5/drivers/cdrom/cdu31a.c Wed Jul 19 06:40:47 2000
> +++ linux/drivers/cdrom/cdu31a.c Tue Oct 24 15:20:45 2000
> @@ -3508,7 +3508,6 @@
> is_a_cdu31a = strcmp("CD-ROM CDU31A", drive_config.product_id) == 0;
>
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = CDU31A_READAHEAD;
> cdu31a_block_size = 1024; /* 1kB default block size */
> /* use 'mount -o block=2048' */
> blksize_size[MAJOR_NR] = &cdu31a_block_size;
> diff -ur linux-test10-pre5/drivers/cdrom/cm206.c linux/drivers/cdrom/cm206.c
> --- linux-test10-pre5/drivers/cdrom/cm206.c Wed Jul 19 06:40:47 2000
> +++ linux/drivers/cdrom/cm206.c Tue Oct 24 15:19:59 2000
> @@ -26,7 +26,7 @@
> 25 feb 1995: 0.21a writes also in interrupt mode, still some
> small bugs to be found... Larger buffer.
> 2 mrt 1995: 0.22 Bug found (cd-> nowhere, interrupt was called in
> - initialization), read_ahead of 16. Timeouts implemented.
> + initialization), read ahead of 16. Timeouts implemented.
> unclear if they do something...
> 7 mrt 1995: 0.23 Start of background read-ahead.
> 18 mrt 1995: 0.24 Working background read-ahead. (still problems)
> @@ -1399,7 +1399,6 @@
> }
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> blksize_size[MAJOR_NR] = cm206_blocksizes;
> - read_ahead[MAJOR_NR] = 16; /* reads ahead what? */
> init_bh(CM206_BH, cm206_bh);
>
> memset(cd, 0, sizeof(*cd)); /* give'm some reasonable value */
> diff -ur linux-test10-pre5/drivers/cdrom/gscd.c linux/drivers/cdrom/gscd.c
> --- linux-test10-pre5/drivers/cdrom/gscd.c Wed Jul 19 07:52:32 2000
> +++ linux/drivers/cdrom/gscd.c Tue Oct 24 15:19:38 2000
> @@ -1086,8 +1086,7 @@
>
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> blksize_size[MAJOR_NR] = gscd_blocksizes;
> - read_ahead[MAJOR_NR] = 4;
> -
> +
> disk_state = 0;
> gscdPresent = 1;
>
> diff -ur linux-test10-pre5/drivers/cdrom/mcd.c linux/drivers/cdrom/mcd.c
> --- linux-test10-pre5/drivers/cdrom/mcd.c Wed Oct 4 01:39:49 2000
> +++ linux/drivers/cdrom/mcd.c Tue Oct 24 15:19:25 2000
> @@ -1194,7 +1194,6 @@
>
> blksize_size[MAJOR_NR] = mcd_blocksizes;
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 4;
>
> /* check for card */
>
> diff -ur linux-test10-pre5/drivers/cdrom/mcdx.c linux/drivers/cdrom/mcdx.c
> --- linux-test10-pre5/drivers/cdrom/mcdx.c Wed Jul 19 06:40:47 2000
> +++ linux/drivers/cdrom/mcdx.c Tue Oct 24 15:19:16 2000
> @@ -1118,7 +1118,6 @@
> }
>
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = READ_AHEAD;
> blksize_size[MAJOR_NR] = mcdx_blocksizes;
>
> xtrace(INIT, "init() subscribe irq and i/o\n");
> diff -ur linux-test10-pre5/drivers/cdrom/optcd.c linux/drivers/cdrom/optcd.c
> --- linux-test10-pre5/drivers/cdrom/optcd.c Wed Jul 5 22:15:19 2000
> +++ linux/drivers/cdrom/optcd.c Tue Oct 24 15:19:04 2000
> @@ -2069,7 +2069,6 @@
> hardsect_size[MAJOR_NR] = &hsecsize;
> blksize_size[MAJOR_NR] = &blksize;
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 4;
> request_region(optcd_port, 4, "optcd");
> register_disk(NULL, MKDEV(MAJOR_NR,0), 1, &opt_fops, 0);
>
> diff -ur linux-test10-pre5/drivers/cdrom/sbpcd.c linux/drivers/cdrom/sbpcd.c
> --- linux-test10-pre5/drivers/cdrom/sbpcd.c Tue Oct 24 13:52:03 2000
> +++ linux/drivers/cdrom/sbpcd.c Tue Oct 24 15:18:52 2000
> @@ -4508,13 +4508,7 @@
> msg(DBG_AUD,"read_audio: successful return.\n");
> RETURN_UP(0);
> } /* end of CDROMREADAUDIO */
> -
> - case BLKRASET:
> - if(!capable(CAP_SYS_ADMIN)) RETURN_UP(-EACCES);
> - if(!(cdi->dev)) RETURN_UP(-EINVAL);
> - if(arg > 0xff) RETURN_UP(-EINVAL);
> - read_ahead[MAJOR(cdi->dev)] = arg;
> - RETURN_UP(0);
> +
> default:
> msg(DBG_IOC,"ioctl: unknown function request %04X\n", cmd);
> RETURN_UP(-EINVAL);
> @@ -5816,10 +5810,8 @@
> }
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> blk_queue_headactive(BLK_DEFAULT_QUEUE(MAJOR_NR), 0);
> - read_ahead[MAJOR_NR] = buffers * (CD_FRAMESIZE / 512);
> -
> request_region(CDo_command,4,major_name);
> -
> +
> devfs_handle = devfs_mk_dir (NULL, "sbp", NULL);
> for (j=0;j<NR_SBPCD;j++)
> {
> diff -ur linux-test10-pre5/drivers/cdrom/sbpcd.h linux/drivers/cdrom/sbpcd.h
> --- linux-test10-pre5/drivers/cdrom/sbpcd.h Mon Sep 11 12:04:09 2000
> +++ linux/drivers/cdrom/sbpcd.h Tue Oct 24 15:17:49 2000
> @@ -162,7 +162,7 @@
> /*==========================================================================*/
> /*==========================================================================*/
> /*
> - * driver's own read_ahead, data mode
> + * driver's own read ahead, data mode
> */
> #define SBP_BUFFER_FRAMES 8
>
> diff -ur linux-test10-pre5/drivers/cdrom/sjcd.c linux/drivers/cdrom/sjcd.c
> --- linux-test10-pre5/drivers/cdrom/sjcd.c Fri Jul 14 21:20:22 2000
> +++ linux/drivers/cdrom/sjcd.c Tue Oct 24 15:27:12 2000
> @@ -1479,7 +1479,6 @@
> }
>
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[ MAJOR_NR ] = 4;
> register_disk(NULL, MKDEV(MAJOR_NR,0), 1, &sjcd_fops, 0);
>
> if( check_region( sjcd_base, 4 ) ){
> diff -ur linux-test10-pre5/drivers/cdrom/sonycd535.c linux/drivers/cdrom/sonycd535.c
> --- linux-test10-pre5/drivers/cdrom/sonycd535.c Wed Oct 4 01:39:49 2000
> +++ linux/drivers/cdrom/sonycd535.c Tue Oct 24 15:18:00 2000
> @@ -1599,7 +1599,6 @@
> }
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> blksize_size[MAJOR_NR] = &sonycd535_block_size;
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
>
> sony_toc = (struct s535_sony_toc *)
> kmalloc(sizeof *sony_toc, GFP_KERNEL);
> diff -ur linux-test10-pre5/drivers/i2o/i2o_block.c linux/drivers/i2o/i2o_block.c
> --- linux-test10-pre5/drivers/i2o/i2o_block.c Fri Jul 7 04:24:51 2000
> +++ linux/drivers/i2o/i2o_block.c Tue Oct 24 15:35:53 2000
> @@ -963,8 +963,6 @@
> case BLKFLSBUF:
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKPG:
> return blk_ioctl(inode->i_rdev, cmd, arg);
>
> diff -ur linux-test10-pre5/drivers/ide/hd.c linux/drivers/ide/hd.c
> --- linux-test10-pre5/drivers/ide/hd.c Wed Jul 5 20:24:41 2000
> +++ linux/drivers/ide/hd.c Tue Oct 24 15:34:53 2000
> @@ -646,8 +646,6 @@
>
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> case BLKPG:
> return blk_ioctl(inode->i_rdev, cmd, arg);
> @@ -829,7 +827,6 @@
> return -1;
> }
> blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
> - read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
> hd_gendisk.next = gendisk_head;
> gendisk_head = &hd_gendisk;
> init_timer(&device_timer);
> diff -ur linux-test10-pre5/drivers/ide/ide-cd.c linux/drivers/ide/ide-cd.c
> --- linux-test10-pre5/drivers/ide/ide-cd.c Mon Sep 11 12:04:10 2000
> +++ linux/drivers/ide/ide-cd.c Tue Oct 24 14:55:18 2000
> @@ -2402,7 +2402,6 @@
> int major = HWIF(drive)->major;
> int minor = drive->select.b.unit << PARTN_BITS;
>
> - ide_add_setting(drive, "breada_readahead", SETTING_RW, BLKRAGET, BLKRASET, TYPE_INT, 0, 255, 1, 2, &read_ahead[major], NULL);
> ide_add_setting(drive, "file_readahead", SETTING_RW, BLKFRAGET, BLKFRASET, TYPE_INTA, 0, INT_MAX, 1, 1024, &max_readahead[major][minor], NULL);
> ide_add_setting(drive, "max_kb_per_request", SETTING_RW, BLKSECTGET, BLKSECTSET, TYPE_INTA, 1, 255, 1, 2, &max_sectors[major][minor], NULL);
> ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
> diff -ur linux-test10-pre5/drivers/ide/ide-disk.c linux/drivers/ide/ide-disk.c
> --- linux-test10-pre5/drivers/ide/ide-disk.c Tue Oct 24 13:52:05 2000
> +++ linux/drivers/ide/ide-disk.c Tue Oct 24 14:26:51 2000
> @@ -702,7 +702,6 @@
> ide_add_setting(drive, "bswap", SETTING_READ, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->bswap, NULL);
> ide_add_setting(drive, "multcount", id ? SETTING_RW : SETTING_READ, HDIO_GET_MULTCOUNT, HDIO_SET_MULTCOUNT, TYPE_BYTE, 0, id ? id->max_multsect : 0, 1, 2, &drive->mult_count, set_multcount);
> ide_add_setting(drive, "nowerr", SETTING_RW, HDIO_GET_NOWERR, HDIO_SET_NOWERR, TYPE_BYTE, 0, 1, 1, 1, &drive->nowerr, set_nowerr);
> - ide_add_setting(drive, "breada_readahead", SETTING_RW, BLKRAGET, BLKRASET, TYPE_INT, 0, 255, 1, 2, &read_ahead[major], NULL);
> ide_add_setting(drive, "file_readahead", SETTING_RW, BLKFRAGET, BLKFRASET, TYPE_INTA, 0, INT_MAX, 1, 1024, &max_readahead[major][minor], NULL);
> ide_add_setting(drive, "max_kb_per_request", SETTING_RW, BLKSECTGET, BLKSECTSET, TYPE_INTA, 1, 255, 1, 2, &max_sectors[major][minor], NULL);
> ide_add_setting(drive, "lun", SETTING_RW, -1, -1, TYPE_INT, 0, 7, 1, 1, &drive->lun, NULL);
> diff -ur linux-test10-pre5/drivers/ide/ide-floppy.c linux/drivers/ide/ide-floppy.c
> --- linux-test10-pre5/drivers/ide/ide-floppy.c Fri Apr 14 07:50:32 2000
> +++ linux/drivers/ide/ide-floppy.c Tue Oct 24 15:17:15 2000
> @@ -1520,7 +1520,6 @@
> ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
> ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
> ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
> - ide_add_setting(drive, "breada_readahead", SETTING_RW, BLKRAGET, BLKRASET, TYPE_INT, 0, 255, 1, 2, &read_ahead[major], NULL);
> ide_add_setting(drive, "file_readahead", SETTING_RW, BLKFRAGET, BLKFRASET, TYPE_INTA, 0, INT_MAX, 1, 1024, &max_readahead[major][minor], NULL);
> ide_add_setting(drive, "max_kb_per_request", SETTING_RW, BLKSECTGET, BLKSECTSET, TYPE_INTA, 1, 255, 1, 2, &max_sectors[major][minor], NULL);
>
> diff -ur linux-test10-pre5/drivers/ide/ide-probe.c linux/drivers/ide/ide-probe.c
> --- linux-test10-pre5/drivers/ide/ide-probe.c Fri Aug 4 01:29:49 2000
> +++ linux/drivers/ide/ide-probe.c Tue Oct 24 14:27:43 2000
> @@ -853,7 +853,6 @@
> init_gendisk(hwif);
> blk_dev[hwif->major].data = hwif;
> blk_dev[hwif->major].queue = ide_get_queue;
> - read_ahead[hwif->major] = 8; /* (4kB) */
> hwif->present = 1; /* success */
>
> #if (DEBUG_SPINLOCK > 0)
> diff -ur linux-test10-pre5/drivers/md/lvm.c linux/drivers/md/lvm.c
> --- linux-test10-pre5/drivers/md/lvm.c Wed Oct 4 01:39:52 2000
> +++ linux/drivers/md/lvm.c Tue Oct 24 15:39:53 2000
> @@ -173,10 +173,6 @@
> #include <linux/errno.h>
> #include <linux/lvm.h>
>
> -#define LVM_CORRECT_READ_AHEAD(a) \
> - (((a) < LVM_MIN_READ_AHEAD || (a) > LVM_MAX_READ_AHEAD) \
> - ? LVM_MAX_READ_AHEAD : (a))
> -
> #ifndef WRITEA
> # define WRITEA WRITE
> #endif
> @@ -878,34 +874,6 @@
> invalidate_buffers(inode->i_rdev);
> break;
>
> -
> - case BLKRASET:
> - /* set read ahead for block device */
> - if (!capable(CAP_SYS_ADMIN)) return -EACCES;
> -
> -#ifdef DEBUG_IOCTL
> - printk(KERN_DEBUG
> - "%s -- lvm_blk_ioctl -- BLKRASET: %d sectors for %02X:%02X\n",
> - lvm_name, (long) arg, MAJOR(inode->i_rdev), minor);
> -#endif
> - if ((long) arg < LVM_MIN_READ_AHEAD ||
> - (long) arg > LVM_MAX_READ_AHEAD)
> - return -EINVAL;
> - read_ahead[MAJOR_NR] = lv_ptr->lv_read_ahead = (long) arg;
> - break;
> -
> -
> - case BLKRAGET:
> - /* get current read ahead setting */
> -#ifdef DEBUG_IOCTL
> - printk(KERN_DEBUG
> - "%s -- lvm_blk_ioctl -- BLKRAGET\n", lvm_name);
> -#endif
> - if (put_user(lv_ptr->lv_read_ahead, (long *)arg))
> - return -EFAULT;
> - break;
> -
> -
> case HDIO_GETGEO:
> /* get disk geometry */
> #ifdef DEBUG_IOCTL
> @@ -2080,7 +2048,6 @@
> lvm_size[MINOR(lv_ptr->lv_dev)] = lv_ptr->lv_size >> 1;
> vg_lv_map[MINOR(lv_ptr->lv_dev)].vg_number = vg_ptr->vg_number;
> vg_lv_map[MINOR(lv_ptr->lv_dev)].lv_number = lv_ptr->lv_number;
> - read_ahead[MAJOR_NR] = lv_ptr->lv_read_ahead = LVM_CORRECT_READ_AHEAD(lv_ptr->lv_read_ahead);
> vg_ptr->lv_cur++;
> lv_ptr->lv_status = lv_status_save;
>
> @@ -2331,7 +2298,6 @@
> lvm_size[MINOR(lv_ptr->lv_dev)] = lv_ptr->lv_size >> 1;
> /* vg_lv_map array doesn't have to be changed here */
>
> - read_ahead[MAJOR_NR] = lv_ptr->lv_read_ahead = LVM_CORRECT_READ_AHEAD(lv_ptr->lv_read_ahead);
> lv_ptr->lv_status = lv_status_save;
>
> return 0;
> diff -ur linux-test10-pre5/drivers/md/md.c linux/drivers/md/md.c
> --- linux-test10-pre5/drivers/md/md.c Tue Oct 24 13:52:05 2000
> +++ linux/drivers/md/md.c Tue Oct 24 15:10:53 2000
> @@ -1674,7 +1674,6 @@
> md_hd_struct[mdidx(mddev)].start_sect = 0;
> md_hd_struct[mdidx(mddev)].nr_sects = md_size[mdidx(mddev)] << 1;
>
> - read_ahead[MD_MAJOR] = 1024;
> return (0);
> }
>
> @@ -2561,22 +2560,6 @@
> invalidate_buffers(dev);
> goto done;
>
> - case BLKRASET:
> - if (arg > 0xff) {
> - err = -EINVAL;
> - goto abort;
> - }
> - read_ahead[MAJOR(dev)] = arg;
> - goto done;
> -
> - case BLKRAGET:
> - if (!arg) {
> - err = -EINVAL;
> - goto abort;
> - }
> - err = md_put_user (read_ahead[
> - MAJOR(dev)], (long *) arg);
> - goto done;
> default:
> }
>
> @@ -3097,12 +3080,6 @@
> sz += sprintf(page+sz, "\n");
>
>
> - sz += sprintf(page+sz, "read_ahead ");
> - if (read_ahead[MD_MAJOR] == INT_MAX)
> - sz += sprintf(page+sz, "not set\n");
> - else
> - sz += sprintf(page+sz, "%d sectors\n", read_ahead[MD_MAJOR]);
> -
> ITERATE_MDDEV(mddev,tmp) {
> sz += sprintf(page + sz, "md%d : %sactive", mdidx(mddev),
> mddev->pers ? "" : "in");
> @@ -3603,9 +3580,7 @@
>
> /* forward all md request to md_make_request */
> blk_queue_make_request(BLK_DEFAULT_QUEUE(MAJOR_NR), md_make_request);
> -
>
> - read_ahead[MAJOR_NR] = INT_MAX;
> md_gendisk.next = gendisk_head;
>
> gendisk_head = &md_gendisk;
> diff -ur linux-test10-pre5/drivers/s390/block/dasd.c linux/drivers/s390/block/dasd.c
> --- linux-test10-pre5/drivers/s390/block/dasd.c Thu Jun 22 07:31:02 2000
> +++ linux/drivers/s390/block/dasd.c Tue Oct 24 15:15:58 2000
> @@ -385,16 +385,6 @@
> rc = fsync_dev (inp->i_rdev);
> break;
> }
> - case BLKRAGET:{
> - rc = copy_to_user ((long *) data,
> - read_ahead + MAJOR_NR, sizeof (long));
> - break;
> - }
> - case BLKRASET:{
> - rc = copy_from_user (read_ahead + MAJOR_NR,
> - (long *) data, sizeof (long));
> - break;
> - }
> case BLKRRPART:{
> INTERNAL_CHECK ("BLKRPART not implemented%s", "");
> rc = -EINVAL;
> @@ -1460,7 +1450,6 @@
> return rc;
> }
> #endif /* DASD_PARANOIA */
> - read_ahead[MAJOR_NR] = 8;
> blk_size[MAJOR_NR] = dasd_blks;
> hardsect_size[MAJOR_NR] = dasd_secsize;
> blksize_size[MAJOR_NR] = dasd_blksize;
> diff -ur linux-test10-pre5/drivers/s390/block/mdisk.c linux/drivers/s390/block/mdisk.c
> --- linux-test10-pre5/drivers/s390/block/mdisk.c Fri May 12 20:41:44 2000
> +++ linux/drivers/s390/block/mdisk.c Tue Oct 24 15:15:27 2000
> @@ -221,23 +221,10 @@
> fsync_dev(inode->i_rdev);
> invalidate_buffers(inode->i_rdev);
> return 0;
> -
> - case BLKRAGET: /* return the readahead value */
> - if (!arg) return -EINVAL;
> - err = access_ok(VERIFY_WRITE, (long *) arg, sizeof(long));
> - if (err) return err;
> - put_user(read_ahead[MAJOR(inode->i_rdev)],(long *) arg);
> - return 0;
> -
> - case BLKRASET: /* set the readahead value */
> - if (!suser()) return -EACCES;
> - if (arg > 0xff) return -EINVAL; /* limit it */
> - read_ahead[MAJOR(inode->i_rdev)] = arg;
> - return 0;
> -
> +
> case BLKRRPART: /* re-read partition table: can't do it */
> return -EINVAL;
> -
> +
> case HDIO_GETGEO:
> /*
> * get geometry of device -> linear
> @@ -709,7 +696,6 @@
> /*
> * setup sizes for available devices
> */
> - read_ahead[MAJOR_NR] = MDISK_RAHEAD; /* 8 sector (4kB) read-ahead */
> blk_size[MAJOR_NR] = mdisk_sizes; /* size of reserved mdisk */
> blksize_size[MAJOR_NR] = mdisk_blksizes; /* blksize of device */
> hardsect_size[MAJOR_NR] = mdisk_hardsects;
> diff -ur linux-test10-pre5/drivers/s390/block/mdisk.h linux/drivers/s390/block/mdisk.h
> --- linux-test10-pre5/drivers/s390/block/mdisk.h Fri May 12 20:41:44 2000
> +++ linux/drivers/s390/block/mdisk.h Tue Oct 24 15:42:06 2000
> @@ -11,7 +11,6 @@
> #include <linux/types.h>
>
> #define MDISK_DEVS 8 /* for disks */
> -#define MDISK_RAHEAD 8 /* read ahead */
> #define MDISK_BLKSIZE 1024 /* 1k blocks */
> #define MDISK_HARDSECT 512 /* FIXME -- 512 byte blocks */
> #define MDISK_MAXSECTORS 256 /* max sectors for one request */
> diff -ur linux-test10-pre5/drivers/scsi/sd.c linux/drivers/scsi/sd.c
> --- linux-test10-pre5/drivers/scsi/sd.c Wed Oct 4 01:40:01 2000
> +++ linux/drivers/scsi/sd.c Tue Oct 24 15:34:33 2000
> @@ -227,8 +227,6 @@
>
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> case BLKSSZGET:
> case BLKPG:
> @@ -1167,18 +1165,6 @@
> rscsi_disks[i].has_part_table = 1;
> }
> }
> - /* If our host adapter is capable of scatter-gather, then we increase
> - * the read-ahead to 60 blocks (120 sectors). If not, we use
> - * a two block (4 sector) read ahead. We can only respect this with the
> - * granularity of every 16 disks (one device major).
> - */
> - for (i = 0; i < N_USED_SD_MAJORS; i++) {
> - read_ahead[SD_MAJOR(i)] =
> - (rscsi_disks[i * SCSI_DISKS_PER_MAJOR].device
> - && rscsi_disks[i * SCSI_DISKS_PER_MAJOR].device->host->sg_tablesize)
> - ? 120 /* 120 sector read-ahead */
> - : 4; /* 4 sector read-ahead */
> - }
>
> return;
> }
> @@ -1386,7 +1372,6 @@
> for (i = 0; i < N_USED_SD_MAJORS; i++) {
> blk_size[SD_MAJOR(i)] = NULL;
> hardsect_size[SD_MAJOR(i)] = NULL;
> - read_ahead[SD_MAJOR(i)] = 0;
> }
> sd_template.dev_max = 0;
> if (sd_gendisks != &sd_gendisk)
> diff -ur linux-test10-pre5/drivers/scsi/sr.c linux/drivers/scsi/sr.c
> --- linux-test10-pre5/drivers/scsi/sr.c Wed Oct 4 01:40:02 2000
> +++ linux/drivers/scsi/sr.c Tue Oct 24 15:22:24 2000
> @@ -803,15 +803,6 @@
> register_cdrom(&scsi_CDs[i].cdi);
> }
>
> -
> - /* If our host adapter is capable of scatter-gather, then we increase
> - * the read-ahead to 16 blocks (32 sectors). If not, we use
> - * a two block (4 sector) read ahead. */
> - if (scsi_CDs[0].device && scsi_CDs[0].device->host->sg_tablesize)
> - read_ahead[MAJOR_NR] = 32; /* 32 sector read-ahead. Always removable. */
> - else
> - read_ahead[MAJOR_NR] = 4; /* 4 sector read-ahead */
> -
> return;
> }
>
> @@ -874,7 +865,6 @@
> blksize_size[MAJOR_NR] = NULL;
> hardsect_size[MAJOR_NR] = NULL;
> blk_size[MAJOR_NR] = NULL;
> - read_ahead[MAJOR_NR] = 0;
>
> sr_template.dev_max = 0;
> }
> diff -ur linux-test10-pre5/drivers/scsi/sr_ioctl.c linux/drivers/scsi/sr_ioctl.c
> --- linux-test10-pre5/drivers/scsi/sr_ioctl.c Mon Sep 11 12:04:13 2000
> +++ linux/drivers/scsi/sr_ioctl.c Tue Oct 24 15:34:37 2000
> @@ -485,8 +485,6 @@
> switch (cmd) {
> case BLKROSET:
> case BLKROGET:
> - case BLKRASET:
> - case BLKRAGET:
> case BLKFLSBUF:
> case BLKSSZGET:
> return blk_ioctl(cdi->dev, cmd, arg);
> diff -ur linux-test10-pre5/fs/block_dev.c linux/fs/block_dev.c
> --- linux-test10-pre5/fs/block_dev.c Wed Oct 4 01:40:07 2000
> +++ linux/fs/block_dev.c Tue Oct 24 14:50:54 2000
> @@ -27,7 +27,7 @@
> {
> struct inode * inode = filp->f_dentry->d_inode;
> ssize_t blocksize, blocksize_bits, i, buffercount, write_error;
> - ssize_t block, blocks;
> + ssize_t block;
> loff_t offset;
> ssize_t chars;
> ssize_t written;
> @@ -83,41 +83,19 @@
> if (!bh)
> return written ? written : -EIO;
>
> - if (!buffer_uptodate(bh))
> - {
> - if (chars == blocksize)
> - wait_on_buffer(bh);
> - else
> - {
> - bhlist[0] = bh;
> - if (!filp->f_reada || !read_ahead[MAJOR(dev)]) {
> - /* We do this to force the read of a single buffer */
> - blocks = 1;
> - } else {
> - /* Read-ahead before write */
> - blocks = read_ahead[MAJOR(dev)] / (blocksize >> 9) / 2;
> - if (block + blocks > size) blocks = size - block;
> - if (blocks > NBUF) blocks=NBUF;
> - if (!blocks) blocks = 1;
> - for(i=1; i<blocks; i++)
> - {
> - bhlist[i] = getblk (dev, block+i, blocksize);
> - if (!bhlist[i])
> - {
> - while(i >= 0) brelse(bhlist[i--]);
> - return written ? written : -EIO;
> - }
> - }
> - }
> - ll_rw_block(READ, blocks, bhlist);
> - for(i=1; i<blocks; i++) brelse(bhlist[i]);
> - wait_on_buffer(bh);
> - if (!buffer_uptodate(bh)) {
> - brelse(bh);
> - return written ? written : -EIO;
> - }
> - };
> - };
> + if (!buffer_uptodate(bh)) {
> + if (chars == blocksize)
> + wait_on_buffer(bh);
> + else {
> + bhlist[0] = bh;
> + ll_rw_block(READ, 1, bhlist);
> + wait_on_buffer(bh);
> + if (!buffer_uptodate(bh)) {
> + brelse(bh);
> + return written ? written : -EIO;
> + }
> + }
> + }
> #endif
> block++;
> p = offset + bh->b_data;
> @@ -170,7 +148,7 @@
> loff_t offset;
> ssize_t blocksize;
> ssize_t blocksize_bits, i;
> - size_t blocks, rblocks, left;
> + size_t blocks, left;
> int bhrequest, uptodate;
> struct buffer_head ** bhb, ** bhe;
> struct buffer_head * buflist[NBUF];
> @@ -212,15 +190,8 @@
> block = offset >> blocksize_bits;
> offset &= blocksize-1;
> size >>= blocksize_bits;
> - rblocks = blocks = (left + offset + blocksize - 1) >> blocksize_bits;
> + blocks = (left + offset + blocksize - 1) >> blocksize_bits;
> bhb = bhe = buflist;
> - if (filp->f_reada) {
> - if (blocks < read_ahead[MAJOR(dev)] / (blocksize >> 9))
> - blocks = read_ahead[MAJOR(dev)] / (blocksize >> 9);
> - if (rblocks > blocks)
> - blocks = rblocks;
> -
> - }
> if (block + blocks > size) {
> blocks = size - block;
> if (blocks == 0)
> @@ -274,7 +245,7 @@
> left = 0;
> break;
> }
> - }
> + }
> if (left < blocksize - offset)
> chars = left;
> else
> diff -ur linux-test10-pre5/fs/hfs/file.c linux/fs/hfs/file.c
> --- linux-test10-pre5/fs/hfs/file.c Mon Sep 11 12:04:18 2000
> +++ linux/fs/hfs/file.c Tue Oct 24 15:25:57 2000
> @@ -312,9 +312,6 @@
>
> bhb = bhe = buflist;
> if (reada) {
> - if (blocks < read_ahead[MAJOR(dev)] / (HFS_SECTOR_SIZE>>9)) {
> - blocks = read_ahead[MAJOR(dev)] / (HFS_SECTOR_SIZE>>9);
> - }
> if (block + blocks > size) {
> blocks = size - block;
> }
> diff -ur linux-test10-pre5/include/linux/fs.h linux/include/linux/fs.h
> --- linux-test10-pre5/include/linux/fs.h Tue Oct 24 13:54:06 2000
> +++ linux/include/linux/fs.h Tue Oct 24 15:32:40 2000
> @@ -166,8 +166,6 @@
> #define BLKRRPART _IO(0x12,95) /* re-read partition table */
> #define BLKGETSIZE _IO(0x12,96) /* return device size */
> #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
> -#define BLKRASET _IO(0x12,98) /* Set read ahead for block device */
> -#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
> #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
> #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
> #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
> @@ -1234,7 +1232,6 @@
>
> extern ssize_t char_read(struct file *, char *, size_t, loff_t *);
> extern ssize_t block_read(struct file *, char *, size_t, loff_t *);
> -extern int read_ahead[];
>
> extern ssize_t char_write(struct file *, const char *, size_t, loff_t *);
> extern ssize_t block_write(struct file *, const char *, size_t, loff_t *);
> diff -ur linux-test10-pre5/include/linux/lvm.h linux/include/linux/lvm.h
> --- linux-test10-pre5/include/linux/lvm.h Thu May 25 03:38:26 2000
> +++ linux/include/linux/lvm.h Tue Oct 24 15:39:08 2000
> @@ -263,8 +263,6 @@
> #define LVM_MAX_STRIPES 128 /* max # of stripes */
> #define LVM_MAX_SIZE ( 1024LU * 1024 * 1024 * 2) /* 1TB[sectors] */
> #define LVM_MAX_MIRRORS 2 /* future use */
> -#define LVM_MIN_READ_AHEAD 0 /* minimum read ahead sectors */
> -#define LVM_MAX_READ_AHEAD 256 /* maximum read ahead sectors */
> #define LVM_MAX_LV_IO_TIMEOUT 60 /* seconds I/O timeout (future use) */
> #define LVM_PARTITION 0xfe /* LVM partition id */
> #define LVM_NEW_PARTITION 0x8e /* new LVM partition id (10/09/1999) */
> @@ -554,7 +552,6 @@
> uint32_t lv_badblock; /* for future use */
> uint32_t lv_allocation;
> uint32_t lv_io_timeout; /* for future use */
> - uint32_t lv_read_ahead; /* HM, for future use */
> }
> lv_disk_v1_t;
>
> @@ -585,7 +582,6 @@
> uint32_t lv_badblock; /* for future use */
> uint32_t lv_allocation;
> uint32_t lv_io_timeout; /* for future use */
> - uint32_t lv_read_ahead;
>
> /* delta to version 1 starts here */
> struct lv_v2 *lv_snapshot_org;
> @@ -625,7 +621,6 @@
> uint32_t lv_badblock; /* for future use */
> uint32_t lv_allocation;
> uint32_t lv_io_timeout; /* for future use */
> - uint32_t lv_read_ahead; /* HM, for future use */
> }
> lv_disk_v2_t;
>
> diff -ur linux-test10-pre5/kernel/ksyms.c linux/kernel/ksyms.c
> --- linux-test10-pre5/kernel/ksyms.c Wed Oct 4 01:40:16 2000
> +++ linux/kernel/ksyms.c Tue Oct 24 14:21:29 2000
> @@ -487,7 +487,6 @@
> EXPORT_SYMBOL(nr_async_pages);
> EXPORT_SYMBOL(___strtok);
> EXPORT_SYMBOL(init_special_inode);
> -EXPORT_SYMBOL(read_ahead);
> EXPORT_SYMBOL(get_hash_table);
> EXPORT_SYMBOL(get_empty_inode);
> EXPORT_SYMBOL(insert_inode_hash);
-
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