md/bitmap: separate bitmap file allocation to its own function.
This will allow allocation before swapping in a new bitmap. Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
parent
9b1215c102
commit
d1244cb062
|
|
@ -716,6 +716,58 @@ static inline struct page *filemap_get_page(struct bitmap_storage *store,
|
|||
- file_page_index(store, 0)];
|
||||
}
|
||||
|
||||
static int bitmap_storage_alloc(struct bitmap_storage *store,
|
||||
unsigned long chunks, int with_super)
|
||||
{
|
||||
int pnum;
|
||||
unsigned long num_pages;
|
||||
unsigned long bytes;
|
||||
|
||||
bytes = DIV_ROUND_UP(chunks, 8);
|
||||
if (with_super)
|
||||
bytes += sizeof(bitmap_super_t);
|
||||
|
||||
num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
|
||||
|
||||
store->filemap = kmalloc(sizeof(struct page *)
|
||||
* num_pages, GFP_KERNEL);
|
||||
if (!store->filemap)
|
||||
return -ENOMEM;
|
||||
|
||||
if (with_super && !store->sb_page) {
|
||||
store->sb_page = alloc_page(GFP_KERNEL);
|
||||
if (store->sb_page == NULL)
|
||||
return -ENOMEM;
|
||||
store->sb_page->index = 0;
|
||||
}
|
||||
pnum = 0;
|
||||
if (store->sb_page) {
|
||||
store->filemap[0] = store->sb_page;
|
||||
pnum = 1;
|
||||
}
|
||||
for ( ; pnum < num_pages; pnum++) {
|
||||
store->filemap[pnum] = alloc_page(GFP_KERNEL);
|
||||
if (!store->filemap[pnum]) {
|
||||
store->file_pages = pnum;
|
||||
return -ENOMEM;
|
||||
}
|
||||
store->filemap[pnum]->index = pnum;
|
||||
}
|
||||
store->file_pages = pnum;
|
||||
|
||||
/* We need 4 bits per page, rounded up to a multiple
|
||||
* of sizeof(unsigned long) */
|
||||
store->filemap_attr = kzalloc(
|
||||
roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
|
||||
GFP_KERNEL);
|
||||
if (!store->filemap_attr)
|
||||
return -ENOMEM;
|
||||
|
||||
store->bytes = bytes;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void bitmap_file_unmap(struct bitmap *bitmap)
|
||||
{
|
||||
struct page **map, *sb_page;
|
||||
|
|
@ -940,11 +992,10 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int n
|
|||
static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
|
||||
{
|
||||
unsigned long i, chunks, index, oldindex, bit;
|
||||
int pnum;
|
||||
struct page *page = NULL;
|
||||
unsigned long num_pages, bit_cnt = 0;
|
||||
unsigned long bit_cnt = 0;
|
||||
struct file *file;
|
||||
unsigned long bytes, offset;
|
||||
unsigned long offset;
|
||||
int outofdate;
|
||||
int ret = -ENOSPC;
|
||||
void *paddr;
|
||||
|
|
@ -973,53 +1024,23 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
|
|||
printk(KERN_INFO "%s: bitmap file is out of date, doing full "
|
||||
"recovery\n", bmname(bitmap));
|
||||
|
||||
bytes = DIV_ROUND_UP(bitmap->chunks, 8);
|
||||
if (!bitmap->mddev->bitmap_info.external)
|
||||
bytes += sizeof(bitmap_super_t);
|
||||
|
||||
store->bytes = bytes;
|
||||
|
||||
num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
|
||||
|
||||
if (file && i_size_read(file->f_mapping->host) < bytes) {
|
||||
if (file && i_size_read(file->f_mapping->host) < store->bytes) {
|
||||
printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n",
|
||||
bmname(bitmap),
|
||||
(unsigned long) i_size_read(file->f_mapping->host),
|
||||
bytes);
|
||||
bmname(bitmap),
|
||||
(unsigned long) i_size_read(file->f_mapping->host),
|
||||
store->bytes);
|
||||
goto err;
|
||||
}
|
||||
|
||||
ret = -ENOMEM;
|
||||
|
||||
store->filemap = kmalloc(sizeof(struct page *)
|
||||
* num_pages, GFP_KERNEL);
|
||||
if (!store->filemap)
|
||||
goto err;
|
||||
|
||||
pnum = 0;
|
||||
offset = 0;
|
||||
if (store->sb_page) {
|
||||
store->filemap[0] = store->sb_page;
|
||||
pnum = 1;
|
||||
offset = sizeof(bitmap_super_t);
|
||||
}
|
||||
for ( ; pnum < num_pages; pnum++) {
|
||||
store->filemap[pnum] = alloc_page(GFP_KERNEL);
|
||||
if (!store->filemap[pnum]) {
|
||||
store->file_pages = pnum;
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
store->file_pages = pnum;
|
||||
|
||||
/* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */
|
||||
store->filemap_attr = kzalloc(
|
||||
roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
|
||||
GFP_KERNEL);
|
||||
if (!store->filemap_attr)
|
||||
ret = bitmap_storage_alloc(&bitmap->storage, bitmap->chunks,
|
||||
!bitmap->mddev->bitmap_info.external);
|
||||
if (ret)
|
||||
goto err;
|
||||
|
||||
oldindex = ~0L;
|
||||
offset = 0;
|
||||
if (!bitmap->mddev->bitmap_info.external)
|
||||
offset = sizeof(bitmap_super_t);
|
||||
|
||||
for (i = 0; i < chunks; i++) {
|
||||
int b;
|
||||
|
|
@ -1028,8 +1049,8 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
|
|||
if (index != oldindex) { /* this is a new page, read it in */
|
||||
int count;
|
||||
/* unmap the old page, we're done with it */
|
||||
if (index == num_pages-1)
|
||||
count = bytes - index * PAGE_SIZE;
|
||||
if (index == store->file_pages-1)
|
||||
count = store->bytes - index * PAGE_SIZE;
|
||||
else
|
||||
count = PAGE_SIZE;
|
||||
page = store->filemap[index];
|
||||
|
|
@ -1083,9 +1104,9 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
|
|||
}
|
||||
|
||||
printk(KERN_INFO "%s: bitmap initialized from disk: "
|
||||
"read %lu/%lu pages, set %lu of %lu bits\n",
|
||||
"read %lu pages, set %lu of %lu bits\n",
|
||||
bmname(bitmap), store->file_pages,
|
||||
num_pages, bit_cnt, chunks);
|
||||
bit_cnt, chunks);
|
||||
|
||||
return 0;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue