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grub2/SOURCES/0325-ieee1275-Avoiding-many...

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Diego Domingos <diegodo@br.ibm.com>
Date: Mon, 14 Dec 2020 17:42:45 +0100
Subject: [PATCH] ieee1275: Avoiding many unecessary open/close
Signed-off-by: Diego Domingos <diegodo@br.ibm.com>
---
grub-core/disk/ieee1275/ofdisk.c | 64 ++++++++++++++++++++++------------------
1 file changed, 35 insertions(+), 29 deletions(-)
diff --git a/grub-core/disk/ieee1275/ofdisk.c b/grub-core/disk/ieee1275/ofdisk.c
index d887d4b6e..f3a6ecd79 100644
--- a/grub-core/disk/ieee1275/ofdisk.c
+++ b/grub-core/disk/ieee1275/ofdisk.c
@@ -44,7 +44,7 @@ struct ofdisk_hash_ent
};
static grub_err_t
-grub_ofdisk_get_block_size (const char *device, grub_uint32_t *block_size,
+grub_ofdisk_get_block_size (grub_uint32_t *block_size,
struct ofdisk_hash_ent *op);
#define OFDISK_HASH_SZ 8
@@ -461,6 +461,7 @@ grub_ofdisk_open (const char *name, grub_disk_t disk)
grub_ssize_t actual;
grub_uint32_t block_size = 0;
grub_err_t err;
+ struct ofdisk_hash_ent *op;
if (grub_strncmp (name, "ieee1275/", sizeof ("ieee1275/") - 1) != 0)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
@@ -471,6 +472,35 @@ grub_ofdisk_open (const char *name, grub_disk_t disk)
grub_dprintf ("disk", "Opening `%s'.\n", devpath);
+ op = ofdisk_hash_find (devpath);
+ if (!op)
+ op = ofdisk_hash_add (devpath, NULL);
+ if (!op)
+ {
+ grub_free (devpath);
+ return grub_errno;
+ }
+
+ /* Check if the call to open is the same to the last disk already opened */
+ if (last_devpath && !grub_strcmp(op->open_path,last_devpath))
+ {
+ goto finish;
+ }
+
+ /* If not, we need to close the previous disk and open the new one */
+ else {
+ if (last_ihandle){
+ grub_ieee1275_close (last_ihandle);
+ }
+ last_ihandle = 0;
+ last_devpath = NULL;
+
+ grub_ieee1275_open (op->open_path, &last_ihandle);
+ if (! last_ihandle)
+ return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
+ last_devpath = op->open_path;
+ }
+
if (grub_ieee1275_finddevice (devpath, &dev))
{
grub_free (devpath);
@@ -491,25 +521,18 @@ grub_ofdisk_open (const char *name, grub_disk_t disk)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a block device");
}
+
+ finish:
/* XXX: There is no property to read the number of blocks. There
should be a property `#blocks', but it is not there. Perhaps it
is possible to use seek for this. */
disk->total_sectors = GRUB_DISK_SIZE_UNKNOWN;
{
- struct ofdisk_hash_ent *op;
- op = ofdisk_hash_find (devpath);
- if (!op)
- op = ofdisk_hash_add (devpath, NULL);
- if (!op)
- {
- grub_free (devpath);
- return grub_errno;
- }
disk->id = (unsigned long) op;
disk->data = op->open_path;
- err = grub_ofdisk_get_block_size (devpath, &block_size, op);
+ err = grub_ofdisk_get_block_size (&block_size, op);
if (err)
{
grub_free (devpath);
@@ -532,13 +555,6 @@ grub_ofdisk_open (const char *name, grub_disk_t disk)
static void
grub_ofdisk_close (grub_disk_t disk)
{
- if (disk->data == last_devpath)
- {
- if (last_ihandle)
- grub_ieee1275_close (last_ihandle);
- last_ihandle = 0;
- last_devpath = NULL;
- }
disk->data = 0;
}
@@ -685,7 +701,7 @@ grub_ofdisk_init (void)
}
static grub_err_t
-grub_ofdisk_get_block_size (const char *device, grub_uint32_t *block_size,
+grub_ofdisk_get_block_size (grub_uint32_t *block_size,
struct ofdisk_hash_ent *op)
{
struct size_args_ieee1275
@@ -698,16 +714,6 @@ grub_ofdisk_get_block_size (const char *device, grub_uint32_t *block_size,
grub_ieee1275_cell_t size2;
} args_ieee1275;
- if (last_ihandle)
- grub_ieee1275_close (last_ihandle);
-
- last_ihandle = 0;
- last_devpath = NULL;
-
- grub_ieee1275_open (device, &last_ihandle);
- if (! last_ihandle)
- return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
-
*block_size = 0;
if (op->block_size_fails >= 2)