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buffer extent for performance

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-02 15:28:29 +01:00
parent 8006f6779e
commit a43c4bc55f
1 changed files with 53 additions and 53 deletions
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66
grub-core/fs/btrfs.c
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@ -70,6 +70,8 @@ struct grub_btrfs_data
unsigned int sblock_number;
grub_uint64_t tree;
grub_uint64_t inode;
grub_uint64_t extstart;
struct grub_btrfs_extent_data *extent;
};
struct grub_btrfs_key
@ -557,7 +559,7 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
static struct grub_btrfs_data *
grub_btrfs_mount (grub_disk_t disk)
{
struct grub_btrfs_data *data = grub_malloc (sizeof (*data));
struct grub_btrfs_data *data = grub_zalloc (sizeof (*data));
unsigned i;
grub_err_t err = GRUB_ERR_NONE;
@ -899,7 +901,10 @@ grub_btrfs_open (struct grub_file *file, const char *name)
static grub_err_t
grub_btrfs_close (grub_file_t file)
{
grub_free (file->data);
struct grub_btrfs_data *data = file->data;
grub_free (data->extent);
grub_free (data);
return GRUB_ERR_NONE;
}
@ -909,16 +914,19 @@ grub_btrfs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_btrfs_data *data = file->data;
grub_off_t pos = file->offset;
grub_disk_addr_t elemaddr;
grub_size_t elemsize;
struct grub_btrfs_key key_in, key_out;
grub_off_t extoff;
while (len)
{
grub_size_t csize;
struct grub_btrfs_extent_data *extent;
grub_err_t err;
grub_off_t extoff;
if (!data->extent || data->extstart > pos ||
grub_le_to_cpu64 (data->extent->size) + data->extstart <= pos)
{
struct grub_btrfs_key key_in, key_out;
grub_disk_addr_t elemaddr;
grub_size_t elemsize;
grub_free (data->extent);
key_in.object_id = data->inode;
key_in.type = GRUB_BTRFS_ITEM_TYPE_EXTENT_ITEM;
key_in.offset = grub_cpu_to_le64 (pos);
@ -933,41 +941,36 @@ grub_btrfs_read (grub_file_t file, char *buf, grub_size_t len)
grub_error (GRUB_ERR_BAD_FS, "extent not found");
return -1;
}
extent = grub_malloc (elemsize);
if (!extent)
data->extstart = grub_le_to_cpu64 (key_out.offset);
data->extent = grub_malloc (elemsize);
if (!data->extent)
return grub_errno;
err = grub_btrfs_read_logical (data, file->device->disk, elemaddr,
extent, elemsize);
data->extent, elemsize);
if (err)
{
grub_free (extent);
return err;
}
if (grub_le_to_cpu64 (extent->size) + grub_le_to_cpu64 (key_out.offset)
<= pos)
{
grub_free (extent);
if (grub_le_to_cpu64 (data->extent->size) + data->extstart <= pos)
return grub_error (GRUB_ERR_BAD_FS, "extent not found");
}
grub_dprintf ("btrfs", "extent 0x%" PRIxGRUB_UINT64_T "+0x%"
PRIxGRUB_UINT64_T "\n",
grub_le_to_cpu64 (key_out.offset),
grub_le_to_cpu64 (extent->size));
csize = grub_le_to_cpu64 (extent->size)
+ grub_le_to_cpu64 (key_out.offset) - pos;
extoff = pos - grub_le_to_cpu64 (key_out.offset);
grub_le_to_cpu64 (data->extent->size));
}
csize = grub_le_to_cpu64 (data->extent->size)
+ grub_le_to_cpu64 (data->extstart) - pos;
extoff = pos - data->extstart;
if (csize > len)
csize = len;
if (extent->encryption)
if (data->extent->encryption)
{
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"encryption not supported");
return -1;
}
if (extent->compression)
if (data->extent->compression)
{
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"compression not supported");
@ -975,37 +978,34 @@ grub_btrfs_read (grub_file_t file, char *buf, grub_size_t len)
}
if (extent->encoding)
if (data->extent->encoding)
{
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"encoding not supported");
return -1;
}
switch (extent->type)
switch (data->extent->type)
{
case GRUB_BTRFS_EXTENT_INLINE:
grub_memcpy (buf, extent->inl + extoff, csize);
grub_free (extent);
grub_memcpy (buf, data->extent->inl + extoff, csize);
break;
case GRUB_BTRFS_EXTENT_REGULAR:
if (!extent->laddr)
if (!data->extent->laddr)
{
grub_memset (buf, 0, csize);
break;
}
err = grub_btrfs_read_logical (data, file->device->disk,
grub_le_to_cpu64 (extent->laddr)
grub_le_to_cpu64 (data->extent->laddr)
+ extoff,
buf, csize);
grub_free (extent);
if (err)
return -1;
break;
default:
grub_free (extent);
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"unsupported extent type 0x%x", extent->type);
"unsupported extent type 0x%x", data->extent->type);
return -1;
}
buf += csize;