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[block] Allow SAN boot device to be identified by filesystem label

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Add a "--label" option that can be used to specify a filesystem label,
to be matched against the FAT volume label.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-03-07 14:09:54 +00:00
parent 62b6d36335
commit 24a855f1fc
3 changed files with 81 additions and 1 deletions
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73
src/interface/efi/efi_block.c
View File

@@ -32,7 +32,9 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <ipxe/refcnt.h>
#include <ipxe/list.h>
@@ -51,6 +53,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/efi/Protocol/BlockIo.h>
#include <ipxe/efi/Protocol/SimpleFileSystem.h>
#include <ipxe/efi/Protocol/AcpiTable.h>
#include <ipxe/efi/Guid/FileSystemInfo.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_strings.h>
#include <ipxe/efi/efi_snp.h>
@@ -595,6 +598,68 @@ static int efi_block_filename ( unsigned int drive, EFI_HANDLE handle,
return rc;
}
/**
* Check for EFI block device filesystem label
*
* @v drive Drive number
* @v root Root directory
* @v label Volume label
* @ret rc Return status code
*/
static int efi_block_label ( unsigned int drive, EFI_FILE_PROTOCOL *root,
const char *label ) {
EFI_FILE_SYSTEM_INFO *info;
UINTN size;
char *actual;
EFI_STATUS efirc;
int rc;
/* Get length of file system information */
size = 0;
root->GetInfo ( root, &efi_file_system_info_id, &size, NULL );
/* Allocate file system information */
info = malloc ( size );
if ( ! info ) {
rc = -ENOMEM;
goto err_alloc_info;
}
/* Get file system information */
if ( ( efirc = root->GetInfo ( root, &efi_file_system_info_id, &size,
info ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( drive, "EFIBLK %#02x could not get filesystem info: "
"%s\n", drive, strerror ( rc ) );
goto err_get_info;
}
/* Construct volume label for comparison */
if ( asprintf ( &actual, "%ls", info->VolumeLabel ) < 0 ) {
rc = -ENOMEM;
goto err_alloc_label;
}
/* Compare volume label */
if ( strcasecmp ( label, actual ) != 0 ) {
DBGC ( drive, "EFIBLK %#02x has wrong label \"%s\"\n",
drive, actual );
rc = -ENOENT;
goto err_compare;
}
/* Success */
rc = 0;
err_compare:
free ( actual );
err_alloc_label:
err_get_info:
free ( info );
err_alloc_info:
return rc;
}
/**
* Check EFI block device filesystem match
*
@@ -675,9 +740,17 @@ static int efi_block_match ( unsigned int drive, EFI_HANDLE handle,
goto err_extra;
}
/* Check volume label, if applicable */
if ( config->label &&
( ( rc = efi_block_label ( drive, root,
config->label ) ) != 0 ) ) {
goto err_label;
}
/* Success */
rc = 0;
err_label:
err_extra:
err_filename:
root->Close ( root );