/*
* ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks
*
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
* @count: pointer to total number of blocks needed
* @errp: error code
*
* Return 1st allocated block number on success, *count stores total account
* error stores in errp pointer
*/
ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp)
{
struct ext4_allocation_request ar;
ext4_fsblk_t ret;
memset(&ar, 0, sizeof(ar));
/* Fill with neighbour allocated blocks */
ar.inode = inode;
ar.goal = goal;
ar.len = count ? *count : 1;
ret = ext4_mb_new_blocks(handle, &ar, errp);
if (count)
*count = ar.len;
/*
* Account for the allocated meta blocks. We will never
* fail EDQUOT for metdata, but we do account for it.
*/
if (!(*errp) && EXT4_I(inode)->i_delalloc_reserved_flag) {
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
EXT4_I(inode)->i_allocated_meta_blocks += ar.len;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
DQUOT_ALLOC_BLOCK(inode, ar.len);
}
return ret;
}
static unsigned ufs_alloccg_block (struct inode * inode,
struct ufs_cg_private_info * ucpi, unsigned goal, int * err)
{
struct super_block * sb;
struct ufs_sb_private_info * uspi;
struct ufs_super_block_first * usb1;
struct ufs_cylinder_group * ucg;
unsigned result, cylno, blkno;
UFSD("ENTER, goal %u\n", goal);
sb = inode->i_sb;
uspi = UFS_SB(sb)->s_uspi;
usb1 = ubh_get_usb_first(uspi);
ucg = ubh_get_ucg(UCPI_UBH(ucpi));
if (goal == 0) {
goal = ucpi->c_rotor;
goto norot;
}
goal = ufs_blknum (goal);
goal = ufs_dtogd (goal);
/*
* If the requested block is available, use it.
*/
if (ubh_isblockset(UCPI_UBH(ucpi), ucpi->c_freeoff, ufs_fragstoblks(goal))) {
result = goal;
goto gotit;
}
norot:
result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb);
if (result == (unsigned)-1)
return (unsigned)-1;
ucpi->c_rotor = result;
gotit:
blkno = ufs_fragstoblks(result);
ubh_clrblock (UCPI_UBH(ucpi), ucpi->c_freeoff, blkno);
if ((UFS_SB(sb)->s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
ufs_clusteracct (sb, ucpi, blkno, -1);
if(DQUOT_ALLOC_BLOCK(inode, uspi->s_fpb)) {
*err = -EDQUOT;
return (unsigned)-1;
}
fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1);
uspi->cs_total.cs_nbfree--;
fs32_sub(sb, &UFS_SB(sb)->fs_cs(ucpi->c_cgx).cs_nbfree, 1);
cylno = ufs_cbtocylno(result);
fs16_sub(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(result)), 1);
fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1);
UFSD("EXIT, result %u\n", result);
return result;
}
static u64 ufs_alloc_fragments(struct inode *inode, unsigned cgno,
u64 goal, unsigned count, int *err)
{
struct super_block * sb;
struct ufs_sb_private_info * uspi;
struct ufs_super_block_first * usb1;
struct ufs_cg_private_info * ucpi;
struct ufs_cylinder_group * ucg;
unsigned oldcg, i, j, k, allocsize;
u64 result;
UFSD("ENTER, ino %lu, cgno %u, goal %llu, count %u\n",
inode->i_ino, cgno, (unsigned long long)goal, count);
sb = inode->i_sb;
uspi = UFS_SB(sb)->s_uspi;
usb1 = ubh_get_usb_first(uspi);
oldcg = cgno;
/*
* 1. searching on preferred cylinder group
*/
UFS_TEST_FREE_SPACE_CG
/*
* 2. quadratic rehash
*/
for (j = 1; j < uspi->s_ncg; j *= 2) {
cgno += j;
if (cgno >= uspi->s_ncg)
cgno -= uspi->s_ncg;
UFS_TEST_FREE_SPACE_CG
}
/*
* 3. brute force search
* We start at i = 2 ( 0 is checked at 1.step, 1 at 2.step )
*/
cgno = (oldcg + 1) % uspi->s_ncg;
for (j = 2; j < uspi->s_ncg; j++) {
cgno++;
if (cgno >= uspi->s_ncg)
cgno = 0;
UFS_TEST_FREE_SPACE_CG
}
UFSD("EXIT (FAILED)\n");
return 0;
cg_found:
ucpi = ufs_load_cylinder (sb, cgno);
if (!ucpi)
return 0;
ucg = ubh_get_ucg (UCPI_UBH(ucpi));
if (!ufs_cg_chkmagic(sb, ucg))
ufs_panic (sb, "ufs_alloc_fragments",
"internal error, bad magic number on cg %u", cgno);
ucg->cg_time = cpu_to_fs32(sb, get_seconds());
if (count == uspi->s_fpb) {
result = ufs_alloccg_block (inode, ucpi, goal, err);
if (result == INVBLOCK)
return 0;
goto succed;
}
for (allocsize = count; allocsize < uspi->s_fpb; allocsize++)
if (fs32_to_cpu(sb, ucg->cg_frsum[allocsize]) != 0)
break;
if (allocsize == uspi->s_fpb) {
result = ufs_alloccg_block (inode, ucpi, goal, err);
if (result == INVBLOCK)
return 0;
goal = ufs_dtogd(uspi, result);
for (i = count; i < uspi->s_fpb; i++)
ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, goal + i);
i = uspi->s_fpb - count;
DQUOT_FREE_BLOCK(inode, i);
fs32_add(sb, &ucg->cg_cs.cs_nffree, i);
uspi->cs_total.cs_nffree += i;
fs32_add(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, i);
fs32_add(sb, &ucg->cg_frsum[i], 1);
goto succed;
}
result = ufs_bitmap_search (sb, ucpi, goal, allocsize);
if (result == INVBLOCK)
return 0;
if(DQUOT_ALLOC_BLOCK(inode, count)) {
*err = -EDQUOT;
return 0;
}
for (i = 0; i < count; i++)
ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_freeoff, result + i);
fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
uspi->cs_total.cs_nffree -= count;
fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count);
fs32_sub(sb, &ucg->cg_frsum[allocsize], 1);
if (count != allocsize)
fs32_add(sb, &ucg->cg_frsum[allocsize - count], 1);
succed:
ubh_mark_buffer_dirty (USPI_UBH(uspi));
ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
if (sb->s_flags & MS_SYNCHRONOUS) {
ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
ubh_wait_on_buffer (UCPI_UBH(ucpi));
}
mark_sb_dirty(sb);
result += cgno * uspi->s_fpg;
UFSD("EXIT3, result %llu\n", (unsigned long long)result);
return result;
}
static u64 ufs_add_fragments(struct inode *inode, u64 fragment,
unsigned oldcount, unsigned newcount, int *err)
{
struct super_block * sb;
struct ufs_sb_private_info * uspi;
struct ufs_super_block_first * usb1;
struct ufs_cg_private_info * ucpi;
struct ufs_cylinder_group * ucg;
unsigned cgno, fragno, fragoff, count, fragsize, i;
UFSD("ENTER, fragment %llu, oldcount %u, newcount %u\n",
(unsigned long long)fragment, oldcount, newcount);
sb = inode->i_sb;
uspi = UFS_SB(sb)->s_uspi;
usb1 = ubh_get_usb_first (uspi);
count = newcount - oldcount;
cgno = ufs_dtog(uspi, fragment);
if (fs32_to_cpu(sb, UFS_SB(sb)->fs_cs(cgno).cs_nffree) < count)
return 0;
if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb)
return 0;
ucpi = ufs_load_cylinder (sb, cgno);
if (!ucpi)
return 0;
ucg = ubh_get_ucg (UCPI_UBH(ucpi));
if (!ufs_cg_chkmagic(sb, ucg)) {
ufs_panic (sb, "ufs_add_fragments",
"internal error, bad magic number on cg %u", cgno);
return 0;
}
fragno = ufs_dtogd(uspi, fragment);
fragoff = ufs_fragnum (fragno);
for (i = oldcount; i < newcount; i++)
if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i))
return 0;
/*
* Block can be extended
*/
ucg->cg_time = cpu_to_fs32(sb, get_seconds());
for (i = newcount; i < (uspi->s_fpb - fragoff); i++)
if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i))
break;
fragsize = i - oldcount;
if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize]))
ufs_panic (sb, "ufs_add_fragments",
"internal error or corrupted bitmap on cg %u", cgno);
fs32_sub(sb, &ucg->cg_frsum[fragsize], 1);
if (fragsize != count)
fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1);
for (i = oldcount; i < newcount; i++)
ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i);
if(DQUOT_ALLOC_BLOCK(inode, count)) {
*err = -EDQUOT;
return 0;
}
fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
fs32_sub(sb, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, count);
uspi->cs_total.cs_nffree -= count;
ubh_mark_buffer_dirty (USPI_UBH(uspi));
ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
if (sb->s_flags & MS_SYNCHRONOUS) {
ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
ubh_wait_on_buffer (UCPI_UBH(ucpi));
}
mark_sb_dirty(sb);
UFSD("EXIT, fragment %llu\n", (unsigned long long)fragment);
return fragment;
}
