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Rewrite blocklist functions in order to get progress when

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reading large extents and decrease amount of blocklist hook calls.
This commit is contained in:
Vladimir Serbinenko 2013-11-01 23:28:03 +01:00
parent 896f913571
commit cb72aa1809
20 changed files with 220 additions and 181 deletions
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37
grub-core/commands/loadenv.c
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@ -259,10 +259,28 @@ check_blocklists (grub_envblk_t envblk, struct blocklist *blocklists,
for (p = blocklists; p; p = p->next)
{
struct blocklist *q;
/* Check if any pair of blocks overlap. */
for (q = p->next; q; q = q->next)
{
/* Check if any pair of blocks overlap. */
if (p->sector == q->sector)
grub_disk_addr_t s1, s2;
grub_disk_addr_t e1, e2, t;
s1 = p->sector;
e1 = s1 + ((p->length + GRUB_DISK_SECTOR_SIZE - 1) >> GRUB_DISK_SECTOR_BITS);
s2 = q->sector;
e2 = s2 + ((q->length + GRUB_DISK_SECTOR_SIZE - 1) >> GRUB_DISK_SECTOR_BITS);
if (s2 > s1)
{
t = s2;
s2 = s1;
s1 = t;
t = e2;
e2 = e1;
e1 = t;
}
if (e1 > s2)
{
/* This might be actually valid, but it is unbelievable that
any filesystem makes such a silly allocation. */
@ -286,9 +304,18 @@ check_blocklists (grub_envblk_t envblk, struct blocklist *blocklists,
part_start = grub_partition_get_start (disk->partition);
buf = grub_envblk_buffer (envblk);
char *blockbuf = NULL;
grub_size_t blockbuf_len = 0;
for (p = blocklists, index = 0; p; index += p->length, p = p->next)
{
char blockbuf[GRUB_DISK_SECTOR_SIZE];
if (p->length > blockbuf_len)
{
grub_free (blockbuf);
blockbuf_len = 2 * p->length;
blockbuf = grub_malloc (blockbuf_len);
if (!blockbuf)
return grub_errno;
}
if (grub_disk_read (disk, p->sector - part_start,
p->offset, p->length, blockbuf))
@ -340,10 +367,6 @@ save_env_read_hook (grub_disk_addr_t sector, unsigned offset, unsigned length,
struct grub_cmd_save_env_ctx *ctx = data;
struct blocklist *block;
if (offset + length > GRUB_DISK_SECTOR_SIZE)
/* Seemingly a bug. */
return;
block = grub_malloc (sizeof (*block));
if (! block)
return;