static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
int create)
{
struct buffer_head *result = NULL;
if ( nr >= 0 )
nr = qnx4_block_map( inode, nr );
if (nr) {
result = sb_getblk(inode->i_sb, nr);
return result;
}
if (!create) {
return NULL;
}
#if 0
tmp = qnx4_new_block(inode->i_sb);
if (!tmp) {
return NULL;
}
result = sb_getblk(inode->i_sb, tmp);
if (tst) {
qnx4_free_block(inode->i_sb, tmp);
brelse(result);
goto repeat;
}
tst = tmp;
#endif
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
return result;
}
struct buffer_head *udf_tgetblk(struct super_block *sb, int block)
{
if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
return sb_getblk(sb, udf_fixed_to_variable(block));
else
return sb_getblk(sb, block);
}
static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
ext4_fsblk_t mmp_block)
{
struct mmp_struct *mmp;
if (*bh)
clear_buffer_uptodate(*bh);
if (!*bh)
*bh = sb_getblk(sb, mmp_block);
if (!*bh)
return -ENOMEM;
if (*bh) {
get_bh(*bh);
lock_buffer(*bh);
(*bh)->b_end_io = end_buffer_read_sync;
submit_bh(READ_SYNC, *bh);
wait_on_buffer(*bh);
if (!buffer_uptodate(*bh)) {
brelse(*bh);
*bh = NULL;
}
}
if (!*bh) {
ext4_warning(sb, "Error while reading MMP block %llu",
mmp_block);
return -EIO;
}
mmp = (struct mmp_struct *)((*bh)->b_data);
if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC)
return -EINVAL;
return 0;
}
static int read_bitmaps (struct super_block * s)
{
int i, bmp;
SB_AP_BITMAP (s) = vmalloc (sizeof (struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
if (SB_AP_BITMAP (s) == 0)
return 1;
memset (SB_AP_BITMAP (s), 0, sizeof (struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
for (i = 0, bmp = REISERFS_DISK_OFFSET_IN_BYTES / s->s_blocksize + 1;
i < SB_BMAP_NR(s); i++, bmp = s->s_blocksize * 8 * i) {
SB_AP_BITMAP (s)[i].bh = sb_getblk (s, bmp);
if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh))
ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh);
}
for (i = 0; i < SB_BMAP_NR(s); i++) {
wait_on_buffer(SB_AP_BITMAP (s)[i].bh);
if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
reiserfs_warning("sh-2029: reiserfs read_bitmaps: "
"bitmap block (#%lu) reading failed\n",
SB_AP_BITMAP(s)[i].bh->b_blocknr);
for (i = 0; i < SB_BMAP_NR(s); i++)
brelse(SB_AP_BITMAP(s)[i].bh);
vfree(SB_AP_BITMAP(s));
SB_AP_BITMAP(s) = NULL;
return 1;
}
load_bitmap_info_data (s, SB_AP_BITMAP (s) + i);
}
return 0;
}
static struct buffer_head *
read_block_bitmap(struct super_block *sb, unsigned int block_group)
{
struct ext2_group_desc * desc;
struct buffer_head * bh = NULL;
ext2_fsblk_t bitmap_blk;
desc = ext2_get_group_desc(sb, block_group, NULL);
if (!desc)
return NULL;
bitmap_blk = le32_to_cpu(desc->bg_block_bitmap);
bh = sb_getblk(sb, bitmap_blk);
if (unlikely(!bh)) {
ext2_error(sb, __func__,
"Cannot read block bitmap - "
"block_group = %d, block_bitmap = %u",
block_group, le32_to_cpu(desc->bg_block_bitmap));
return NULL;
}
if (likely(bh_uptodate_or_lock(bh)))
return bh;
if (bh_submit_read(bh) < 0) {
brelse(bh);
ext2_error(sb, __func__,
"Cannot read block bitmap - "
"block_group = %d, block_bitmap = %u",
block_group, le32_to_cpu(desc->bg_block_bitmap));
return NULL;
}
ext2_valid_block_bitmap(sb, desc, block_group, bh);
return bh;
}
/*
* Nullify new chunk of inodes,
* BSD people also set ui_gen field of inode
* during nullification, but we not care about
* that because of linux ufs do not support NFS
*/
static void ufs2_init_inodes_chunk(struct super_block *sb,
struct ufs_cg_private_info *ucpi,
struct ufs_cylinder_group *ucg)
{
struct buffer_head *bh;
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
sector_t beg = uspi->s_sbbase +
ufs_inotofsba(ucpi->c_cgx * uspi->s_ipg +
fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk));
sector_t end = beg + uspi->s_fpb;
UFSD("ENTER cgno %d\n", ucpi->c_cgx);
for (; beg < end; ++beg) {
bh = sb_getblk(sb, beg);
lock_buffer(bh);
memset(bh->b_data, 0, sb->s_blocksize);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
unlock_buffer(bh);
if (sb->s_flags & MS_SYNCHRONOUS)
sync_dirty_buffer(bh);
brelse(bh);
}
fs32_add(sb, &ucg->cg_u.cg_u2.cg_initediblk, uspi->s_inopb);
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));
}
UFSD("EXIT\n");
}
void sysv_free_block(struct super_block * sb, sysv_zone_t nr)
{
struct sysv_sb_info * sbi = SYSV_SB(sb);
struct buffer_head * bh;
sysv_zone_t *blocks = sbi->s_bcache;
unsigned count;
unsigned block = fs32_to_cpu(sbi, nr);
/*
* This code does not work at all for AFS (it has a bitmap
* free list). As AFS is supposed to be read-only no one
* should call this for an AFS filesystem anyway...
*/
if (sbi->s_type == FSTYPE_AFS)
return;
if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
printk("sysv_free_block: trying to free block not in datazone\n");
return;
}
mutex_lock(&sbi->s_lock);
count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
if (count > sbi->s_flc_size) {
printk("sysv_free_block: flc_count %d > flc_size %d\n", count, sbi->s_flc_size);
mutex_unlock(&sbi->s_lock);
return;
}
/* If the free list head in super-block is full, it is copied
* into this block being freed, ditto if it's completely empty
* (applies only on Coherent).
*/
if (count == sbi->s_flc_size || count == 0) {
block += sbi->s_block_base;
bh = sb_getblk(sb, block);
if (!bh) {
printk("sysv_free_block: getblk() failed\n");
mutex_unlock(&sbi->s_lock);
return;
}
memset(bh->b_data, 0, sb->s_blocksize);
*(__fs16*)bh->b_data = cpu_to_fs16(sbi, count);
memcpy(get_chunk(sb,bh), blocks, count * sizeof(sysv_zone_t));
mark_buffer_dirty(bh);
set_buffer_uptodate(bh);
brelse(bh);
count = 0;
}
sbi->s_bcache[count++] = nr;
*sbi->s_bcache_count = cpu_to_fs16(sbi, count);
fs32_add(sbi, sbi->s_free_blocks, 1);
dirty_sb(sb);
mutex_unlock(&sbi->s_lock);
}
/**
* nilfs_move_2nd_super - relocate secondary super block
* @sb: super block instance
* @sb2off: new offset of the secondary super block (in bytes)
*/
static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off)
{
struct the_nilfs *nilfs = sb->s_fs_info;
struct buffer_head *nsbh;
struct nilfs_super_block *nsbp;
sector_t blocknr, newblocknr;
unsigned long offset;
int sb2i; /* array index of the secondary superblock */
int ret = 0;
/* nilfs->ns_sem must be locked by the caller. */
if (nilfs->ns_sbh[1] &&
nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) {
sb2i = 1;
blocknr = nilfs->ns_sbh[1]->b_blocknr;
} else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) {
sb2i = 0;
blocknr = nilfs->ns_sbh[0]->b_blocknr;
} else {
sb2i = -1;
blocknr = 0;
}
if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off)
goto out; /* super block location is unchanged */
/* Get new super block buffer */
newblocknr = sb2off >> nilfs->ns_blocksize_bits;
offset = sb2off & (nilfs->ns_blocksize - 1);
nsbh = sb_getblk(sb, newblocknr);
if (!nsbh) {
nilfs_msg(sb, KERN_WARNING,
"unable to move secondary superblock to block %llu",
(unsigned long long)newblocknr);
ret = -EIO;
goto out;
}
nsbp = (void *)nsbh->b_data + offset;
memset(nsbp, 0, nilfs->ns_blocksize);
if (sb2i >= 0) {
memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
brelse(nilfs->ns_sbh[sb2i]);
nilfs->ns_sbh[sb2i] = nsbh;
nilfs->ns_sbp[sb2i] = nsbp;
} else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) {
/* secondary super block will be restored to index 1 */
nilfs->ns_sbh[1] = nsbh;
nilfs->ns_sbp[1] = nsbp;
} else {
brelse(nsbh);
}
out:
return ret;
}
/* Write to quotafile */
static ssize_t ext2_quota_write(struct super_block *sb, int type,
const char *data, size_t len, loff_t off)
{
struct inode *inode = sb_dqopt(sb)->files[type];
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
int err = 0;
int offset = off & (sb->s_blocksize - 1);
int tocopy;
size_t towrite = len;
struct buffer_head tmp_bh;
struct buffer_head *bh;
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
while (towrite > 0) {
tocopy = sb->s_blocksize - offset < towrite ?
sb->s_blocksize - offset : towrite;
tmp_bh.b_state = 0;
err = ext2_get_block(inode, blk, &tmp_bh, 1);
if (err < 0)
goto out;
if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
bh = sb_bread(sb, tmp_bh.b_blocknr);
else
bh = sb_getblk(sb, tmp_bh.b_blocknr);
if (!bh) {
err = -EIO;
goto out;
}
lock_buffer(bh);
memcpy(bh->b_data+offset, data, tocopy);
flush_dcache_page(bh->b_page);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
unlock_buffer(bh);
brelse(bh);
offset = 0;
towrite -= tocopy;
data += tocopy;
blk++;
}
out:
if (len == towrite) {
mutex_unlock(&inode->i_mutex);
return err;
}
if (inode->i_size < off+len-towrite)
i_size_write(inode, off+len-towrite);
inode->i_version++;
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
mutex_unlock(&inode->i_mutex);
return len - towrite;
}
static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
int create)
{
struct buffer_head *result = NULL;
if ( nr >= 0 )
nr = qnx4_block_map( inode, nr );
if (nr) {
result = sb_getblk(inode->i_sb, nr);
return result;
}
return NULL;
}
// desperately need ERR_PTR return here to distinguish between
// ENOMEM, which should be impossible but when it happens we
// need to do something reasonable, or ENOSPC which we must
// just report and keep going without a fuss.
static struct buffer_head *new_block(struct btree *btree)
{
block_t block;
int err = btree->ops->balloc(btree->sb, 1, &block);
if (err)
return NULL; // ERR_PTR me!!!
struct buffer_head *buffer = sb_getblk(vfs_sb(btree->sb), block);
if (!buffer)
return NULL;
memset(bufdata(buffer), 0, bufsize(buffer));
mark_buffer_dirty(buffer);
return buffer;
}
void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp)
{
struct buffer_head *bh;
/*return hpfs_map_sector(s, secno, bhp, 0);*/
cond_resched();
if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
if (!buffer_uptodate(bh)) wait_on_buffer(bh);
set_buffer_uptodate(bh);
return bh->b_data;
} else {
printk("HPFS: hpfs_get_sector: getblk failed\n");
return NULL;
}
}
/*
* Read the MMP block. It _must_ be read from disk and hence we clear the
* uptodate flag on the buffer.
*/
static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
ext4_fsblk_t mmp_block)
{
struct mmp_struct *mmp;
int ret;
if (*bh)
clear_buffer_uptodate(*bh);
/* This would be sb_bread(sb, mmp_block), except we need to be sure
* that the MD RAID device cache has been bypassed, and that the read
* is not blocked in the elevator. */
if (!*bh) {
*bh = sb_getblk(sb, mmp_block);
if (!*bh) {
ret = -ENOMEM;
goto warn_exit;
}
}
get_bh(*bh);
lock_buffer(*bh);
(*bh)->b_end_io = end_buffer_read_sync;
submit_bh(READ_SYNC | REQ_META | REQ_PRIO, *bh);
wait_on_buffer(*bh);
if (!buffer_uptodate(*bh)) {
ret = -EIO;
goto warn_exit;
}
mmp = (struct mmp_struct *)((*bh)->b_data);
if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC) {
ret = -EFSCORRUPTED;
goto warn_exit;
}
if (!ext4_mmp_csum_verify(sb, mmp)) {
ret = -EFSBADCRC;
goto warn_exit;
}
return 0;
warn_exit:
brelse(*bh);
*bh = NULL;
ext4_warning(sb, "Error %d while reading MMP block %llu",
ret, mmp_block);
return ret;
}
void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp)
{
struct buffer_head *bh;
/*return hpfs_map_sector(s, secno, bhp, 0);*/
hpfs_lock_assert(s);
cond_resched();
if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
if (!buffer_uptodate(bh)) wait_on_buffer(bh);
set_buffer_uptodate(bh);
return bh->b_data;
} else {
pr_err("%s(): getblk failed\n", __func__);
return NULL;
}
}
/*
* hfs_buffer_get()
*
* Return a buffer for the 'block'th block of the media.
* If ('read'==0) then the buffer is not read from disk.
*/
hfs_buffer hfs_buffer_get(hfs_sysmdb sys_mdb, int block, int read) {
hfs_buffer tmp = HFS_BAD_BUFFER;
if (read) {
tmp = sb_bread(sys_mdb, block);
} else {
tmp = sb_getblk(sys_mdb, block);
if (tmp) {
mark_buffer_uptodate(tmp, 1);
}
}
if (!tmp) {
hfs_error("hfs_fs: unable to read block 0x%08x from dev %s\n",
block, hfs_mdb_name(sys_mdb));
}
return tmp;
}
static void ufs_clear_frags(struct inode *inode, sector_t beg, unsigned int n,
int sync)
{
struct buffer_head *bh;
sector_t end = beg + n;
for (; beg < end; ++beg) {
bh = sb_getblk(inode->i_sb, beg);
lock_buffer(bh);
memset(bh->b_data, 0, inode->i_sb->s_blocksize);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
unlock_buffer(bh);
if (IS_SYNC(inode) || sync)
sync_dirty_buffer(bh);
brelse(bh);
}
}
static struct buffer_head *
ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
struct inode *alloc_inode,
struct ocfs2_alloc_context *ac,
struct ocfs2_chain_list *cl)
{
int status;
u32 bit_off, num_bits;
u64 bg_blkno;
struct buffer_head *bg_bh;
unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
status = ocfs2_claim_clusters(handle, ac,
le16_to_cpu(cl->cl_cpg), &bit_off,
&num_bits);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
/* setup the group */
bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
trace_ocfs2_block_group_alloc_contig(
(unsigned long long)bg_blkno, alloc_rec);
bg_bh = sb_getblk(osb->sb, bg_blkno);
if (!bg_bh) {
status = -EIO;
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
bg_blkno, num_bits, alloc_rec, cl);
if (status < 0) {
brelse(bg_bh);
mlog_errno(status);
}
bail:
return status ? ERR_PTR(status) : bg_bh;
}
static int32_t
lnx_bget(tarfs_io_t *iop, uint64_t blkno)
{
struct super_block *sb;
struct buffer_head *bh;
if (iop == NULL) {
return -EINVAL;
}
sb = iop->io_dev;
iop->io_blkno = blkno;
bh = sb_getblk(sb, iop->io_blkno);
if (bh == NULL) {
return -EIO;
}
iop->io_bh = bh;
iop->io_data = bh->b_data;
return 0;
}
/*
* Read the MMP block. It _must_ be read from disk and hence we clear the
* uptodate flag on the buffer.
*/
static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
ext4_fsblk_t mmp_block)
{
struct mmp_struct *mmp;
if (*bh)
clear_buffer_uptodate(*bh);
/* This would be sb_bread(sb, mmp_block), except we need to be sure
* that the MD RAID device cache has been bypassed, and that the read
* is not blocked in the elevator. */
if (!*bh)
*bh = sb_getblk(sb, mmp_block);
if (!*bh)
return -ENOMEM;
if (*bh) {
get_bh(*bh);
lock_buffer(*bh);
(*bh)->b_end_io = end_buffer_read_sync;
#ifdef FEATURE_STORAGE_META_LOG
if( (*bh) && (*bh)->b_bdev && (*bh)->b_bdev->bd_disk)
set_metadata_rw_status((*bh)->b_bdev->bd_disk->first_minor, WAIT_READ_CNT);
#endif
submit_bh(READ_SYNC | REQ_META | REQ_PRIO, *bh);
wait_on_buffer(*bh);
if (!buffer_uptodate(*bh)) {
brelse(*bh);
*bh = NULL;
}
}
if (unlikely(!*bh)) {
ext4_warning(sb, "Error while reading MMP block %llu",
mmp_block);
return -EIO;
}
mmp = (struct mmp_struct *)((*bh)->b_data);
if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC ||
!ext4_mmp_csum_verify(sb, mmp))
return -EINVAL;
return 0;
}
static int alloc_branch(struct inode *inode,
int num,
int *offsets,
Indirect *branch)
{
int n = 0;
int i;
int parent = minix_new_block(inode);
printk("parent new block %d\n",parent);
branch[0].key = cpu_to_block(parent);
if (parent) for (n = 1; n < num; n++) {
struct buffer_head *bh;
/* Allocate the next block */
int nr = minix_new_block(inode);
printk("loop new block %d",nr);
if (!nr)
break;
branch[n].key = cpu_to_block(nr);
bh = sb_getblk(inode->i_sb, parent);
lock_buffer(bh);
memset(bh->b_data, 0, bh->b_size);
branch[n].bh = bh;
branch[n].p = (block_t*) bh->b_data + offsets[n];
*branch[n].p = branch[n].key;
set_buffer_uptodate(bh);
unlock_buffer(bh);
mark_buffer_dirty_inode(bh, inode);
parent = nr;
}
if (n == num)
return 0;
/* Allocation failed, free what we already allocated */
for (i = 1; i < n; i++)
bforget(branch[i].bh);
for (i = 0; i < n; i++)
minix_free_block(inode, block_to_cpu(branch[i].key));
return -ENOSPC;
}
/*
* Read the MMP block. It _must_ be read from disk and hence we clear the
* uptodate flag on the buffer.
*/
static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
ext4_fsblk_t mmp_block)
{
struct mmp_struct *mmp;
if (*bh)
clear_buffer_uptodate(*bh);
/* This would be sb_bread(sb, mmp_block), except we need to be sure
* that the MD RAID device cache has been bypassed, and that the read
* is not blocked in the elevator. */
if (!*bh)
*bh = sb_getblk(sb, mmp_block);
if (!*bh)
return -ENOMEM;
if (*bh) {
get_bh(*bh);
lock_buffer(*bh);
(*bh)->b_end_io = end_buffer_read_sync;
submit_bh(READ_SYNC, *bh);
wait_on_buffer(*bh);
if (!buffer_uptodate(*bh)) {
brelse(*bh);
*bh = NULL;
}
}
if (unlikely(!*bh)) {
ext4_warning(sb, "Error while reading MMP block %llu",
mmp_block);
return -EIO;
}
mmp = (struct mmp_struct *)((*bh)->b_data);
if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC ||
!ext4_mmp_csum_verify(sb, mmp))
return -EINVAL;
return 0;
}
static int __f2fs_commit_super(struct f2fs_sb_info *sbi, int block)
{
struct f2fs_super_block *super = F2FS_RAW_SUPER(sbi);
struct buffer_head *bh;
int err;
bh = sb_getblk(sbi->sb, block);
if (!bh)
return -EIO;
lock_buffer(bh);
memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
set_buffer_uptodate(bh);
set_buffer_dirty(bh);
unlock_buffer(bh);
/* it's rare case, we can do fua all the time */
err = __sync_dirty_buffer(bh, WRITE_FLUSH_FUA);
brelse(bh);
return err;
}
static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
sector_t phys)
{
struct super_block *sb = dir->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
struct buffer_head *bh;
int sec;
/* This is not a first sector of cluster, or sec_per_clus == 1 */
if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
return;
/* root dir of FAT12/FAT16 */
if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
return;
bh = sb_getblk(sb, phys);
if (bh && !buffer_uptodate(bh)) {
for (sec = 0; sec < sbi->sec_per_clus; sec++)
sb_breadahead(sb, phys + sec);
}
brelse(bh);
}
/**
* ext4_read_block_bitmap()
* @sb: super block
* @block_group: given block group
*
* Read the bitmap for a given block_group,and validate the
* bits for block/inode/inode tables are set in the bitmaps
*
* Return buffer_head on success or NULL in case of failure.
*/
struct buffer_head *
ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
{
struct ext4_group_desc *desc;
struct buffer_head *bh = NULL;
ext4_fsblk_t bitmap_blk;
desc = ext4_get_group_desc(sb, block_group, NULL);
if (!desc)
return NULL;
bitmap_blk = ext4_block_bitmap(sb, desc);
bh = sb_getblk(sb, bitmap_blk);
if (unlikely(!bh)) {
ext4_error(sb, __func__,
"Cannot read block bitmap - "
"block_group = %u, block_bitmap = %llu",
block_group, bitmap_blk);
return NULL;
}
if (bitmap_uptodate(bh))
return bh;
lock_buffer(bh);
if (bitmap_uptodate(bh)) {
unlock_buffer(bh);
return bh;
}
ext4_lock_group(sb, block_group);
if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
ext4_init_block_bitmap(sb, bh, block_group, desc);
set_bitmap_uptodate(bh);
set_buffer_uptodate(bh);
ext4_unlock_group(sb, block_group);
unlock_buffer(bh);
return bh;
}
ext4_unlock_group(sb, block_group);
if (buffer_uptodate(bh)) {
/*
* if not uninit if bh is uptodate,
* bitmap is also uptodate
*/
set_bitmap_uptodate(bh);
unlock_buffer(bh);
return bh;
}
/*
* submit the buffer_head for read. We can
* safely mark the bitmap as uptodate now.
* We do it here so the bitmap uptodate bit
* get set with buffer lock held.
*/
set_bitmap_uptodate(bh);
if (bh_submit_read(bh) < 0) {
put_bh(bh);
ext4_error(sb, __func__,
"Cannot read block bitmap - "
"block_group = %u, block_bitmap = %llu",
block_group, bitmap_blk);
return NULL;
}
ext4_valid_block_bitmap(sb, desc, block_group, bh);
/*
* file system mounted not to panic on error,
* continue with corrupt bitmap
*/
return bh;
}
int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
struct buffer_head *bhs[], int flags,
int (*validate)(struct super_block *sb,
struct buffer_head *bh))
{
int status = 0;
int i, ignore_cache = 0;
struct buffer_head *bh;
mlog_entry("(inode=%p, block=(%llu), nr=(%d), flags=%d)\n",
inode, (unsigned long long)block, nr, flags);
BUG_ON(!inode);
BUG_ON((flags & OCFS2_BH_READAHEAD) &&
(flags & OCFS2_BH_IGNORE_CACHE));
if (bhs == NULL) {
status = -EINVAL;
mlog_errno(status);
goto bail;
}
if (nr < 0) {
mlog(ML_ERROR, "asked to read %d blocks!\n", nr);
status = -EINVAL;
mlog_errno(status);
goto bail;
}
if (nr == 0) {
mlog(ML_BH_IO, "No buffers will be read!\n");
status = 0;
goto bail;
}
mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
for (i = 0 ; i < nr ; i++) {
if (bhs[i] == NULL) {
bhs[i] = sb_getblk(inode->i_sb, block++);
if (bhs[i] == NULL) {
mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
status = -EIO;
mlog_errno(status);
goto bail;
}
}
bh = bhs[i];
ignore_cache = (flags & OCFS2_BH_IGNORE_CACHE);
/* There are three read-ahead cases here which we need to
* be concerned with. All three assume a buffer has
* previously been submitted with OCFS2_BH_READAHEAD
* and it hasn't yet completed I/O.
*
* 1) The current request is sync to disk. This rarely
* happens these days, and never when performance
* matters - the code can just wait on the buffer
* lock and re-submit.
*
* 2) The current request is cached, but not
* readahead. ocfs2_buffer_uptodate() will return
* false anyway, so we'll wind up waiting on the
* buffer lock to do I/O. We re-check the request
* with after getting the lock to avoid a re-submit.
*
* 3) The current request is readahead (and so must
* also be a caching one). We short circuit if the
* buffer is locked (under I/O) and if it's in the
* uptodate cache. The re-check from #2 catches the
* case that the previous read-ahead completes just
* before our is-it-in-flight check.
*/
if (!ignore_cache && !ocfs2_buffer_uptodate(inode, bh)) {
mlog(ML_UPTODATE,
"bh (%llu), inode %llu not uptodate\n",
(unsigned long long)bh->b_blocknr,
(unsigned long long)OCFS2_I(inode)->ip_blkno);
/* We're using ignore_cache here to say
* "go to disk" */
ignore_cache = 1;
}
if (buffer_jbd(bh)) {
if (ignore_cache)
mlog(ML_BH_IO, "trying to sync read a jbd "
"managed bh (blocknr = %llu)\n",
(unsigned long long)bh->b_blocknr);
continue;
}
if (ignore_cache) {
if (buffer_dirty(bh)) {
/* This should probably be a BUG, or
* at least return an error. */
mlog(ML_BH_IO, "asking me to sync read a dirty "
"buffer! (blocknr = %llu)\n",
(unsigned long long)bh->b_blocknr);
continue;
}
/* A read-ahead request was made - if the
* buffer is already under read-ahead from a
* previously submitted request than we are
* done here. */
if ((flags & OCFS2_BH_READAHEAD)
&& ocfs2_buffer_read_ahead(inode, bh))
continue;
lock_buffer(bh);
if (buffer_jbd(bh)) {
#ifdef CATCH_BH_JBD_RACES
mlog(ML_ERROR, "block %llu had the JBD bit set "
"while I was in lock_buffer!",
(unsigned long long)bh->b_blocknr);
BUG();
#else
unlock_buffer(bh);
continue;
#endif
}
/* Re-check ocfs2_buffer_uptodate() as a
* previously read-ahead buffer may have
* completed I/O while we were waiting for the
* buffer lock. */
if (!(flags & OCFS2_BH_IGNORE_CACHE)
&& !(flags & OCFS2_BH_READAHEAD)
&& ocfs2_buffer_uptodate(inode, bh)) {
unlock_buffer(bh);
continue;
}
clear_buffer_uptodate(bh);
get_bh(bh); /* for end_buffer_read_sync() */
if (validate)
set_buffer_needs_validate(bh);
bh->b_end_io = end_buffer_read_sync;
submit_bh(READ, bh);
continue;
}
}
status = 0;
for (i = (nr - 1); i >= 0; i--) {
bh = bhs[i];
if (!(flags & OCFS2_BH_READAHEAD)) {
/* We know this can't have changed as we hold the
* inode sem. Avoid doing any work on the bh if the
* journal has it. */
if (!buffer_jbd(bh))
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
/* Status won't be cleared from here on out,
* so we can safely record this and loop back
* to cleanup the other buffers. Don't need to
* remove the clustered uptodate information
* for this bh as it's not marked locally
* uptodate. */
status = -EIO;
put_bh(bh);
bhs[i] = NULL;
continue;
}
if (buffer_needs_validate(bh)) {
/* We never set NeedsValidate if the
* buffer was held by the journal, so
* that better not have changed */
BUG_ON(buffer_jbd(bh));
clear_buffer_needs_validate(bh);
status = validate(inode->i_sb, bh);
if (status) {
put_bh(bh);
bhs[i] = NULL;
continue;
}
}
}
/* Always set the buffer in the cache, even if it was
* a forced read, or read-ahead which hasn't yet
* completed. */
ocfs2_set_buffer_uptodate(inode, bh);
}
mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
mlog(ML_BH_IO, "block=(%llu), nr=(%d), cached=%s, flags=0x%x\n",
(unsigned long long)block, nr,
((flags & OCFS2_BH_IGNORE_CACHE) || ignore_cache) ? "no" : "yes",
flags);
bail:
mlog_exit(status);
return status;
}
int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
unsigned int nr, struct buffer_head *bhs[])
{
int status = 0;
unsigned int i;
struct buffer_head *bh;
if (!nr) {
mlog(ML_BH_IO, "No buffers will be read!\n");
goto bail;
}
for (i = 0 ; i < nr ; i++) {
if (bhs[i] == NULL) {
bhs[i] = sb_getblk(osb->sb, block++);
if (bhs[i] == NULL) {
status = -EIO;
mlog_errno(status);
goto bail;
}
}
bh = bhs[i];
if (buffer_jbd(bh)) {
mlog(ML_BH_IO,
"trying to sync read a jbd "
"managed bh (blocknr = %llu), skipping\n",
(unsigned long long)bh->b_blocknr);
continue;
}
if (buffer_dirty(bh)) {
/* This should probably be a BUG, or
* at least return an error. */
mlog(ML_ERROR,
"trying to sync read a dirty "
"buffer! (blocknr = %llu), skipping\n",
(unsigned long long)bh->b_blocknr);
continue;
}
lock_buffer(bh);
if (buffer_jbd(bh)) {
mlog(ML_ERROR,
"block %llu had the JBD bit set "
"while I was in lock_buffer!",
(unsigned long long)bh->b_blocknr);
BUG();
}
clear_buffer_uptodate(bh);
get_bh(bh); /* for end_buffer_read_sync() */
bh->b_end_io = end_buffer_read_sync;
submit_bh(READ, bh);
}
for (i = nr; i > 0; i--) {
bh = bhs[i - 1];
/* No need to wait on the buffer if it's managed by JBD. */
if (!buffer_jbd(bh))
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
/* Status won't be cleared from here on out,
* so we can safely record this and loop back
* to cleanup the other buffers. */
status = -EIO;
put_bh(bh);
bhs[i - 1] = NULL;
}
}
bail:
return status;
}
/*
* Returns a pointer to a buffer containing at least LEN bytes of
* filesystem starting at byte offset OFFSET into the filesystem.
*/
static void *cramfs_read(struct super_block *sb, unsigned int offset, unsigned int len)
{
struct buffer_head * bh_array[BLKS_PER_BUF];
struct buffer_head * read_array[BLKS_PER_BUF];
unsigned i, blocknr, buffer, unread;
unsigned long devsize;
int major, minor;
char *data;
if (!len)
return NULL;
blocknr = offset >> PAGE_CACHE_SHIFT;
offset &= PAGE_CACHE_SIZE - 1;
/* Check if an existing buffer already has the data.. */
for (i = 0; i < READ_BUFFERS; i++) {
unsigned int blk_offset;
if (buffer_dev[i] != sb)
continue;
if (blocknr < buffer_blocknr[i])
continue;
blk_offset = (blocknr - buffer_blocknr[i]) << PAGE_CACHE_SHIFT;
blk_offset += offset;
if (blk_offset + len > BUFFER_SIZE)
continue;
return read_buffers[i] + blk_offset;
}
devsize = ~0UL;
major = MAJOR(sb->s_dev);
minor = MINOR(sb->s_dev);
if (blk_size[major])
devsize = blk_size[major][minor] >> 2;
/* Ok, read in BLKS_PER_BUF pages completely first. */
unread = 0;
for (i = 0; i < BLKS_PER_BUF; i++) {
struct buffer_head *bh;
bh = NULL;
if (blocknr + i < devsize) {
bh = sb_getblk(sb, blocknr + i);
if (!buffer_uptodate(bh))
read_array[unread++] = bh;
}
bh_array[i] = bh;
}
if (unread) {
ll_rw_block(READ, unread, read_array);
do {
unread--;
wait_on_buffer(read_array[unread]);
} while (unread);
}
/* Ok, copy them to the staging area without sleeping. */
buffer = next_buffer;
next_buffer = NEXT_BUFFER(buffer);
buffer_blocknr[buffer] = blocknr;
buffer_dev[buffer] = sb;
data = read_buffers[buffer];
for (i = 0; i < BLKS_PER_BUF; i++) {
struct buffer_head * bh = bh_array[i];
if (bh) {
memcpy(data, bh->b_data, PAGE_CACHE_SIZE);
brelse(bh);
} else
memset(data, 0, PAGE_CACHE_SIZE);
data += PAGE_CACHE_SIZE;
}
return read_buffers[buffer] + offset;
}
static int ext4_convert_inline_data_nolock(handle_t *handle,
struct inode *inode,
struct ext4_iloc *iloc)
{
int error;
void *buf = NULL;
struct buffer_head *data_bh = NULL;
struct ext4_map_blocks map;
int inline_size;
inline_size = ext4_get_inline_size(inode);
buf = kmalloc(inline_size, GFP_NOFS);
if (!buf) {
error = -ENOMEM;
goto out;
}
error = ext4_read_inline_data(inode, buf, inline_size, iloc);
if (error < 0)
goto out;
/*
* Make sure the inline directory entries pass checks before we try to
* convert them, so that we avoid touching stuff that needs fsck.
*/
if (S_ISDIR(inode->i_mode)) {
error = ext4_check_all_de(inode, iloc->bh,
buf + EXT4_INLINE_DOTDOT_SIZE,
inline_size - EXT4_INLINE_DOTDOT_SIZE);
if (error)
goto out;
}
error = ext4_destroy_inline_data_nolock(handle, inode);
if (error)
goto out;
map.m_lblk = 0;
map.m_len = 1;
map.m_flags = 0;
error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
if (error < 0)
goto out_restore;
if (!(map.m_flags & EXT4_MAP_MAPPED)) {
error = -EIO;
goto out_restore;
}
data_bh = sb_getblk(inode->i_sb, map.m_pblk);
if (!data_bh) {
error = -ENOMEM;
goto out_restore;
}
lock_buffer(data_bh);
error = ext4_journal_get_create_access(handle, data_bh);
if (error) {
unlock_buffer(data_bh);
error = -EIO;
goto out_restore;
}
memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
if (!S_ISDIR(inode->i_mode)) {
memcpy(data_bh->b_data, buf, inline_size);
set_buffer_uptodate(data_bh);
error = ext4_handle_dirty_metadata(handle,
inode, data_bh);
} else {
error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
buf, inline_size);
}
unlock_buffer(data_bh);
out_restore:
if (error)
ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
out:
brelse(data_bh);
kfree(buf);
return error;
}
static int ufs_alloc_lastblock(struct inode *inode)
{
int err = 0;
struct super_block *sb = inode->i_sb;
struct address_space *mapping = inode->i_mapping;
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
unsigned i, end;
sector_t lastfrag;
struct page *lastpage;
struct buffer_head *bh;
u64 phys64;
lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
if (!lastfrag)
goto out;
lastfrag--;
lastpage = ufs_get_locked_page(mapping, lastfrag >>
(PAGE_CACHE_SHIFT - inode->i_blkbits));
if (IS_ERR(lastpage)) {
err = -EIO;
goto out;
}
end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
bh = page_buffers(lastpage);
for (i = 0; i < end; ++i)
bh = bh->b_this_page;
err = ufs_getfrag_block(inode, lastfrag, bh, 1);
if (unlikely(err))
goto out_unlock;
if (buffer_new(bh)) {
clear_buffer_new(bh);
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
/*
* we do not zeroize fragment, because of
* if it maped to hole, it already contains zeroes
*/
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
set_page_dirty(lastpage);
}
if (lastfrag >= UFS_IND_FRAGMENT) {
end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
phys64 = bh->b_blocknr + 1;
for (i = 0; i < end; ++i) {
bh = sb_getblk(sb, i + phys64);
lock_buffer(bh);
memset(bh->b_data, 0, sb->s_blocksize);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
unlock_buffer(bh);
sync_dirty_buffer(bh);
brelse(bh);
}
}
out_unlock:
ufs_put_locked_page(lastpage);
out:
return err;
}
int __microfs_read_blks(struct super_block* sb,
struct address_space* mapping, void* data,
microfs_read_blks_recycler recycler,
microfs_read_blks_consumer consumer,
__u32 offset, __u32 length)
{
__u32 i;
__u32 n;
__u32 dev_blks;
int err = 0;
__u32 blk_nr;
__u32 blk_offset;
__u32 nbhs;
struct buffer_head** bhs;
if (recycler(sb, data, offset, length, consumer) == 0)
goto out_cachehit;
blk_offset = offset - (offset & PAGE_MASK);
nbhs = i_blks(blk_offset + length, PAGE_SIZE);
bhs = kmalloc(nbhs * sizeof(void*), GFP_KERNEL);
if (!bhs) {
pr_err("__microfs_read_blks: failed to allocate bhs (%u slots)\n", nbhs);
err = -ENOMEM;
goto err_mem;
}
blk_nr = offset >> PAGE_SHIFT;
dev_blks = sb->s_bdev->bd_inode->i_size >> PAGE_SHIFT;
pr_spam("__microfs_read_blks: offset=0x%x, blk_offset=%u, length=%u\n",
offset, blk_offset, length);
pr_spam("__microfs_read_blks: nbhs=%u, blk_nr=%u, dev_blks=%u\n",
nbhs, blk_nr, dev_blks);
for (i = 0, n = 0; i < nbhs; ++i) {
if (likely(blk_nr + i < dev_blks)) {
bhs[n++] = sb_getblk(sb, blk_nr + i);
if (unlikely(bhs[n - 1] == NULL)) {
pr_err("__microfs_read_blks: failed to get a bh for block %u\n",
blk_nr + i);
err = -EIO;
goto err_bhs;
} else {
pr_spam("__microfs_read_blks: got bh 0x%p for block %u\n",
bhs[n - 1], blk_nr + i);
}
} else {
/* It is not possible to fill the entire read buffer this
* time. "Welcome to the end of the image."
*/
bhs[i] = NULL;
}
}
ll_rw_block(REQ_OP_READ, 0, n, bhs);
pr_spam("__microfs_read_blks: bhs submitted for reading\n");
for (i = 0; i < n; ++i) {
wait_on_buffer(bhs[i]);
if (unlikely(!buffer_uptodate(bhs[i]))) {
pr_err("__microfs_read_blks: bh 0x%p (#%u) is not up-to-date\n", bhs[i], i);
err = -EIO;
goto err_bhs;
}
}
pr_spam("__microfs_read_blks: reading complete\n");
err = consumer(sb, data, bhs, n, offset, length);
pr_spam("__microfs_read_blks: processing complete\n");
err_bhs:
for (i = 0; i < n; ++i) {
pr_spam("__microfs_read_blks: releasing bh 0x%p\n", bhs[i]);
put_bh(bhs[i]);
}
kfree(bhs);
err_mem:
out_cachehit:
return err;
}