61 lines
2.1 KiB
Plaintext
61 lines
2.1 KiB
Plaintext
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From 61474615b8e177881caa89fc04cae16019cf01b9 Mon Sep 17 00:00:00 2001
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From: Matthew Garrett <mjg@redhat.com>
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Date: Wed, 15 Aug 2012 14:37:07 -0400
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Subject: [PATCH] efidisk: Read chunks in smaller blocks
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---
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grub-core/disk/efi/efidisk.c | 26 ++++++++++++++++++++++----
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1 file changed, 22 insertions(+), 4 deletions(-)
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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 a432b44..77ab5b0 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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@@ -546,6 +546,9 @@ grub_efidisk_read (struct grub_disk *disk, grub_disk_addr_t sector,
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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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+ grub_size_t remaining = size;
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+ grub_size_t read = 0;
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+ grub_size_t chunk = 0x500;
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d = disk->data;
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bio = d->block_io;
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@@ -554,14 +557,29 @@ grub_efidisk_read (struct grub_disk *disk, grub_disk_addr_t sector,
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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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+ while (remaining > chunk) {
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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 + read,
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+ (grub_efi_uintn_t) chunk << disk->log_sector_size,
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+ buf + (read << disk->log_sector_size));
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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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+ (unsigned long long) sector + read,
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+ disk->name);
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+ read += chunk;
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+ remaining -= chunk;
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+ }
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+
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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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+ (grub_efi_uint64_t) sector + read,
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+ (grub_efi_uintn_t) remaining << disk->log_sector_size,
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+ buf + (read << disk->log_sector_size));
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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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- (unsigned long long) sector,
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+ (unsigned long long) sector + read,
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disk->name);
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return GRUB_ERR_NONE;
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--
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1.7.11.2
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