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