static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
{
union nilfs_bmap_ptr_req req;
struct inode *dat = NULL;
struct buffer_head *bh;
int ret;
if (key > NILFS_DIRECT_KEY_MAX)
return -ENOENT;
if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR)
return -EEXIST;
if (NILFS_BMAP_USE_VBN(bmap)) {
req.bpr_ptr = nilfs_direct_find_target_v(bmap, key);
dat = nilfs_bmap_get_dat(bmap);
}
ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
if (!ret) {
/* ptr must be a pointer to a buffer head. */
bh = (struct buffer_head *)((unsigned long)ptr);
set_buffer_nilfs_volatile(bh);
nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
nilfs_direct_set_ptr(bmap, key, req.bpr_ptr);
if (!nilfs_bmap_dirty(bmap))
nilfs_bmap_set_dirty(bmap);
if (NILFS_BMAP_USE_VBN(bmap))
nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr);
nilfs_inode_add_blocks(bmap->b_inode, 1);
}
return ret;
}
static int nilfs_direct_assign(struct nilfs_bmap *bmap,
struct buffer_head **bh,
sector_t blocknr,
union nilfs_binfo *binfo)
{
__u64 key;
__u64 ptr;
key = nilfs_bmap_data_get_key(bmap, *bh);
if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
printk(KERN_CRIT "%s: invalid key: %llu\n", __func__,
(unsigned long long)key);
return -EINVAL;
}
ptr = nilfs_direct_get_ptr(bmap, key);
if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
printk(KERN_CRIT "%s: invalid pointer: %llu\n", __func__,
(unsigned long long)ptr);
return -EINVAL;
}
return NILFS_BMAP_USE_VBN(bmap) ?
nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) :
nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo);
}
static int nilfs_direct_propagate(struct nilfs_bmap *bmap,
struct buffer_head *bh)
{
struct nilfs_palloc_req oldreq, newreq;
struct inode *dat;
__u64 key;
__u64 ptr;
int ret;
if (!NILFS_BMAP_USE_VBN(bmap))
return 0;
dat = nilfs_bmap_get_dat(bmap);
key = nilfs_bmap_data_get_key(bmap, bh);
ptr = nilfs_direct_get_ptr(bmap, key);
if (!buffer_nilfs_volatile(bh)) {
oldreq.pr_entry_nr = ptr;
newreq.pr_entry_nr = ptr;
ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
if (ret < 0)
return ret;
nilfs_dat_commit_update(dat, &oldreq, &newreq,
bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
set_buffer_nilfs_volatile(bh);
nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr);
} else
ret = nilfs_dat_mark_dirty(dat, ptr);
return ret;
}
static int nilfs_direct_propagate(const struct nilfs_bmap *bmap,
struct buffer_head *bh)
{
struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
return NILFS_BMAP_USE_VBN(bmap) ?
nilfs_direct_propagate_v(direct, bh) : 0;
}
static int nilfs_direct_prepare_insert(struct nilfs_direct *direct,
__u64 key,
union nilfs_bmap_ptr_req *req,
struct nilfs_bmap_stats *stats)
{
int ret;
if (NILFS_BMAP_USE_VBN(&direct->d_bmap))
req->bpr_ptr = nilfs_direct_find_target_v(direct, key);
ret = nilfs_bmap_prepare_alloc_ptr(&direct->d_bmap, req);
if (ret < 0)
return ret;
stats->bs_nblocks = 1;
return 0;
}
static void nilfs_direct_commit_insert(struct nilfs_direct *direct,
union nilfs_bmap_ptr_req *req,
__u64 key, __u64 ptr)
{
struct buffer_head *bh;
/* ptr must be a pointer to a buffer head. */
bh = (struct buffer_head *)((unsigned long)ptr);
set_buffer_nilfs_volatile(bh);
nilfs_bmap_commit_alloc_ptr(&direct->d_bmap, req);
nilfs_direct_set_ptr(direct, key, req->bpr_ptr);
if (!nilfs_bmap_dirty(&direct->d_bmap))
nilfs_bmap_set_dirty(&direct->d_bmap);
if (NILFS_BMAP_USE_VBN(&direct->d_bmap))
nilfs_direct_set_target_v(direct, key, req->bpr_ptr);
}
static int nilfs_direct_lookup_contig(const struct nilfs_bmap *bmap,
__u64 key, __u64 *ptrp,
unsigned maxblocks)
{
struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
struct inode *dat = NULL;
__u64 ptr, ptr2;
sector_t blocknr;
int ret, cnt;
if (key > NILFS_DIRECT_KEY_MAX)
return -ENOENT;
ptr = nilfs_direct_get_ptr(direct, key);
if (ptr == NILFS_BMAP_INVALID_PTR)
return -ENOENT;
if (NILFS_BMAP_USE_VBN(bmap)) {
dat = nilfs_bmap_get_dat(bmap);
ret = nilfs_dat_translate(dat, ptr, &blocknr);
if (ret < 0)
return ret;
ptr = blocknr;
}
maxblocks = min_t(unsigned, maxblocks, NILFS_DIRECT_KEY_MAX - key + 1);
for (cnt = 1; cnt < maxblocks &&
(ptr2 = nilfs_direct_get_ptr(direct, key + cnt)) !=
NILFS_BMAP_INVALID_PTR;
cnt++) {
if (dat) {
ret = nilfs_dat_translate(dat, ptr2, &blocknr);
if (ret < 0)
return ret;
ptr2 = blocknr;
}
if (ptr2 != ptr + cnt)
break;
}
*ptrp = ptr;
return cnt;
}
/**
* nilfs_bmap_lookup_at_level - find a data block or node block
* @bmap: bmap
* @key: key
* @level: level
* @ptrp: place to store the value associated to @key
*
* Description: nilfs_bmap_lookup_at_level() finds a record whose key
* matches @key in the block at @level of the bmap.
*
* Return Value: On success, 0 is returned and the record associated with @key
* is stored in the place pointed by @ptrp. On error, one of the following
* negative error codes is returned.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-ENOENT - A record associated with @key does not exist.
*/
int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level,
__u64 *ptrp)
{
sector_t blocknr;
int ret;
down_read(&bmap->b_sem);
ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp);
if (ret < 0)
goto out;
if (NILFS_BMAP_USE_VBN(bmap)) {
ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
&blocknr);
if (!ret)
*ptrp = blocknr;
}
out:
up_read(&bmap->b_sem);
return ret;
}
static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
{
union nilfs_bmap_ptr_req req;
struct inode *dat;
int ret;
if (key > NILFS_DIRECT_KEY_MAX ||
nilfs_direct_get_ptr(bmap, key) == NILFS_BMAP_INVALID_PTR)
return -ENOENT;
dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
req.bpr_ptr = nilfs_direct_get_ptr(bmap, key);
ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
if (!ret) {
nilfs_bmap_commit_end_ptr(bmap, &req, dat);
nilfs_direct_set_ptr(bmap, key, NILFS_BMAP_INVALID_PTR);
nilfs_inode_sub_blocks(bmap->b_inode, 1);
}
return ret;
}