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From f63be03880f3667f2fb75acaa02f633e265e01e5 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Mon, 15 Apr 2013 09:12:14 +0200
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Subject: [PATCH 318/482] * grub-core/disk/efi/efidisk.c: Limit disk
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read or write chunk to 0x500 sectors. Based on patch by Peter Jones.
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---
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ChangeLog | 7 +++++++
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grub-core/disk/efi/efidisk.c | 50 +++++++++++++++++++++++++++++---------------
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2 files changed, 40 insertions(+), 17 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index 2dcf1f5..6f33ff1 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,4 +1,11 @@
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2013-04-15 Vladimir Serbinenko <phcoder@gmail.com>
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+2013-04-15 Peter Jones <pjones@redhat.com>
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+
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+ * grub-core/disk/efi/efidisk.c: Limit disk read or write chunk to 0x500
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+ sectors.
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+ Based on patch by Peter Jones.
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+
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+2013-04-15 Vladimir Serbinenko <phcoder@gmail.com>
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Fix DMRAID partition handling.
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diff --git a/grub-core/disk/efi/efidisk.c b/grub-core/disk/efi/efidisk.c
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index 28b9fa1..5a6fc63 100644
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--- a/grub-core/disk/efi/efidisk.c
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+++ b/grub-core/disk/efi/efidisk.c
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@@ -528,9 +528,9 @@ grub_efidisk_close (struct grub_disk *disk __attribute__ ((unused)))
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grub_dprintf ("efidisk", "closing %s\n", disk->name);
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}
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-static grub_err_t
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-grub_efidisk_read (struct grub_disk *disk, grub_disk_addr_t sector,
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- grub_size_t size, char *buf)
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+static grub_efi_status_t
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+grub_efidisk_readwrite (struct grub_disk *disk, grub_disk_addr_t sector,
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+ grub_size_t size, char *buf, int wr)
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{
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/* For now, use the disk io interface rather than the block io's. */
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struct grub_efidisk_data *d;
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@@ -540,14 +540,38 @@ grub_efidisk_read (struct grub_disk *disk, grub_disk_addr_t sector,
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d = disk->data;
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bio = d->block_io;
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+ while (size > 0)
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+ {
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+ grub_size_t len;
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+ len = 0x500;
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+ if (len > size)
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+ len = size;
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+ status = efi_call_5 ((wr ? bio->write_blocks : bio->read_blocks), bio,
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+ bio->media->media_id,
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+ (grub_efi_uint64_t) sector,
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+ (grub_efi_uintn_t) size << disk->log_sector_size,
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+ buf);
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+ size -= len;
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+ buf += len << disk->log_sector_size;
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+ sector += len;
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+ if (status != GRUB_EFI_SUCCESS)
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+ return status;
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+ }
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+ return GRUB_EFI_SUCCESS;
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+}
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+
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+static grub_err_t
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+grub_efidisk_read (struct grub_disk *disk, grub_disk_addr_t sector,
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+ grub_size_t size, char *buf)
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+{
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+ grub_efi_status_t status;
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+
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grub_dprintf ("efidisk",
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"reading 0x%lx sectors at the sector 0x%llx from %s\n",
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(unsigned long) size, (unsigned long long) sector, disk->name);
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- status = efi_call_5 (bio->read_blocks, bio, bio->media->media_id,
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- (grub_efi_uint64_t) sector,
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- (grub_efi_uintn_t) size << disk->log_sector_size,
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- buf);
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+ status = grub_efidisk_readwrite (disk, sector, size, buf, 0);
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+
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if (status != GRUB_EFI_SUCCESS)
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return grub_error (GRUB_ERR_READ_ERROR,
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N_("failure reading sector 0x%llx from `%s'"),
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@@ -561,22 +585,14 @@ static grub_err_t
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grub_efidisk_write (struct grub_disk *disk, grub_disk_addr_t sector,
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grub_size_t size, const char *buf)
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{
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- /* For now, use the disk io interface rather than the block io's. */
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- struct grub_efidisk_data *d;
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- grub_efi_block_io_t *bio;
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grub_efi_status_t status;
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- d = disk->data;
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- bio = d->block_io;
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-
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grub_dprintf ("efidisk",
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"writing 0x%lx sectors at the sector 0x%llx to %s\n",
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(unsigned long) size, (unsigned long long) sector, disk->name);
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- status = efi_call_5 (bio->write_blocks, bio, bio->media->media_id,
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- (grub_efi_uint64_t) sector,
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- (grub_efi_uintn_t) size << disk->log_sector_size,
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- (void *) buf);
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+ status = grub_efidisk_readwrite (disk, sector, size, (char *) buf, 1);
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+
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if (status != GRUB_EFI_SUCCESS)
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return grub_error (GRUB_ERR_WRITE_ERROR,
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N_("failure writing sector 0x%llx to `%s'"),
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--
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1.8.2.1
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