391 lines
9.9 KiB
C
391 lines
9.9 KiB
C
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/*
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* direct.c - NILFS direct block pointer.
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*
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#include <linux/errno.h>
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#include "nilfs.h"
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#include "page.h"
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#include "direct.h"
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#include "alloc.h"
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#include "dat.h"
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static inline __le64 *nilfs_direct_dptrs(const struct nilfs_direct *direct)
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{
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return (__le64 *)
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((struct nilfs_direct_node *)direct->d_bmap.b_u.u_data + 1);
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}
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static inline __u64
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nilfs_direct_get_ptr(const struct nilfs_direct *direct, __u64 key)
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{
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return nilfs_bmap_dptr_to_ptr(*(nilfs_direct_dptrs(direct) + key));
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}
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static inline void nilfs_direct_set_ptr(struct nilfs_direct *direct,
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__u64 key, __u64 ptr)
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{
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*(nilfs_direct_dptrs(direct) + key) = nilfs_bmap_ptr_to_dptr(ptr);
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}
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static int nilfs_direct_lookup(const struct nilfs_bmap *bmap,
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__u64 key, int level, __u64 *ptrp)
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{
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struct nilfs_direct *direct;
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__u64 ptr;
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direct = (struct nilfs_direct *)bmap;
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if ((key > NILFS_DIRECT_KEY_MAX) ||
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(level != 1) || /* XXX: use macro for level 1 */
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((ptr = nilfs_direct_get_ptr(direct, key)) ==
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NILFS_BMAP_INVALID_PTR))
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return -ENOENT;
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if (ptrp != NULL)
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*ptrp = ptr;
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return 0;
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}
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static int nilfs_direct_lookup_contig(const struct nilfs_bmap *bmap,
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__u64 key, __u64 *ptrp,
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unsigned maxblocks)
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{
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struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
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struct inode *dat = NULL;
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__u64 ptr, ptr2;
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sector_t blocknr;
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int ret, cnt;
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if (key > NILFS_DIRECT_KEY_MAX ||
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(ptr = nilfs_direct_get_ptr(direct, key)) ==
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NILFS_BMAP_INVALID_PTR)
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return -ENOENT;
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if (NILFS_BMAP_USE_VBN(bmap)) {
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dat = nilfs_bmap_get_dat(bmap);
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ret = nilfs_dat_translate(dat, ptr, &blocknr);
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if (ret < 0)
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return ret;
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ptr = blocknr;
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}
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maxblocks = min_t(unsigned, maxblocks, NILFS_DIRECT_KEY_MAX - key + 1);
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for (cnt = 1; cnt < maxblocks &&
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(ptr2 = nilfs_direct_get_ptr(direct, key + cnt)) !=
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NILFS_BMAP_INVALID_PTR;
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cnt++) {
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if (dat) {
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ret = nilfs_dat_translate(dat, ptr2, &blocknr);
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if (ret < 0)
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return ret;
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ptr2 = blocknr;
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}
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if (ptr2 != ptr + cnt)
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break;
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}
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*ptrp = ptr;
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return cnt;
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}
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static __u64
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nilfs_direct_find_target_v(const struct nilfs_direct *direct, __u64 key)
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{
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__u64 ptr;
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ptr = nilfs_bmap_find_target_seq(&direct->d_bmap, key);
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if (ptr != NILFS_BMAP_INVALID_PTR)
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/* sequential access */
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return ptr;
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else
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/* block group */
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return nilfs_bmap_find_target_in_group(&direct->d_bmap);
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}
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static void nilfs_direct_set_target_v(struct nilfs_direct *direct,
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__u64 key, __u64 ptr)
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{
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direct->d_bmap.b_last_allocated_key = key;
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direct->d_bmap.b_last_allocated_ptr = ptr;
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}
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static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
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{
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struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
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union nilfs_bmap_ptr_req req;
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struct inode *dat = NULL;
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struct buffer_head *bh;
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int ret;
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if (key > NILFS_DIRECT_KEY_MAX)
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return -ENOENT;
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if (nilfs_direct_get_ptr(direct, key) != NILFS_BMAP_INVALID_PTR)
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return -EEXIST;
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if (NILFS_BMAP_USE_VBN(bmap)) {
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req.bpr_ptr = nilfs_direct_find_target_v(direct, key);
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dat = nilfs_bmap_get_dat(bmap);
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}
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ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
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if (!ret) {
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/* ptr must be a pointer to a buffer head. */
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bh = (struct buffer_head *)((unsigned long)ptr);
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set_buffer_nilfs_volatile(bh);
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nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
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nilfs_direct_set_ptr(direct, key, req.bpr_ptr);
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if (!nilfs_bmap_dirty(bmap))
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nilfs_bmap_set_dirty(bmap);
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if (NILFS_BMAP_USE_VBN(bmap))
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nilfs_direct_set_target_v(direct, key, req.bpr_ptr);
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nilfs_bmap_add_blocks(bmap, 1);
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}
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return ret;
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}
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static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
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{
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struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
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union nilfs_bmap_ptr_req req;
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struct inode *dat;
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int ret;
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if (key > NILFS_DIRECT_KEY_MAX ||
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nilfs_direct_get_ptr(direct, key) == NILFS_BMAP_INVALID_PTR)
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return -ENOENT;
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dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
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req.bpr_ptr = nilfs_direct_get_ptr(direct, key);
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ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
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if (!ret) {
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nilfs_bmap_commit_end_ptr(bmap, &req, dat);
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nilfs_direct_set_ptr(direct, key, NILFS_BMAP_INVALID_PTR);
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nilfs_bmap_sub_blocks(bmap, 1);
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}
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return ret;
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}
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static int nilfs_direct_last_key(const struct nilfs_bmap *bmap, __u64 *keyp)
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{
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struct nilfs_direct *direct;
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__u64 key, lastkey;
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direct = (struct nilfs_direct *)bmap;
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lastkey = NILFS_DIRECT_KEY_MAX + 1;
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for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++)
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if (nilfs_direct_get_ptr(direct, key) !=
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NILFS_BMAP_INVALID_PTR)
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lastkey = key;
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if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
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return -ENOENT;
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*keyp = lastkey;
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return 0;
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}
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static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
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{
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return key > NILFS_DIRECT_KEY_MAX;
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}
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static int nilfs_direct_gather_data(struct nilfs_bmap *bmap,
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__u64 *keys, __u64 *ptrs, int nitems)
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{
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struct nilfs_direct *direct;
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__u64 key;
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__u64 ptr;
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int n;
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direct = (struct nilfs_direct *)bmap;
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if (nitems > NILFS_DIRECT_NBLOCKS)
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nitems = NILFS_DIRECT_NBLOCKS;
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n = 0;
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for (key = 0; key < nitems; key++) {
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ptr = nilfs_direct_get_ptr(direct, key);
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if (ptr != NILFS_BMAP_INVALID_PTR) {
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keys[n] = key;
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ptrs[n] = ptr;
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n++;
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}
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}
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return n;
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}
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int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
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__u64 key, __u64 *keys, __u64 *ptrs, int n)
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{
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struct nilfs_direct *direct;
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__le64 *dptrs;
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int ret, i, j;
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/* no need to allocate any resource for conversion */
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/* delete */
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ret = bmap->b_ops->bop_delete(bmap, key);
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if (ret < 0)
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return ret;
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/* free resources */
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if (bmap->b_ops->bop_clear != NULL)
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bmap->b_ops->bop_clear(bmap);
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/* convert */
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direct = (struct nilfs_direct *)bmap;
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dptrs = nilfs_direct_dptrs(direct);
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for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
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if ((j < n) && (i == keys[j])) {
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dptrs[i] = (i != key) ?
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nilfs_bmap_ptr_to_dptr(ptrs[j]) :
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NILFS_BMAP_INVALID_PTR;
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j++;
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} else
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dptrs[i] = NILFS_BMAP_INVALID_PTR;
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}
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nilfs_direct_init(bmap);
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return 0;
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}
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static int nilfs_direct_propagate(const struct nilfs_bmap *bmap,
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struct buffer_head *bh)
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{
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struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
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struct nilfs_palloc_req oldreq, newreq;
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struct inode *dat;
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__u64 key;
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__u64 ptr;
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int ret;
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if (!NILFS_BMAP_USE_VBN(bmap))
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return 0;
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dat = nilfs_bmap_get_dat(bmap);
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key = nilfs_bmap_data_get_key(bmap, bh);
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ptr = nilfs_direct_get_ptr(direct, key);
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if (!buffer_nilfs_volatile(bh)) {
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oldreq.pr_entry_nr = ptr;
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newreq.pr_entry_nr = ptr;
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ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
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if (ret < 0)
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return ret;
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nilfs_dat_commit_update(dat, &oldreq, &newreq,
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bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
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set_buffer_nilfs_volatile(bh);
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nilfs_direct_set_ptr(direct, key, newreq.pr_entry_nr);
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} else
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ret = nilfs_dat_mark_dirty(dat, ptr);
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return ret;
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}
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static int nilfs_direct_assign_v(struct nilfs_direct *direct,
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__u64 key, __u64 ptr,
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struct buffer_head **bh,
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sector_t blocknr,
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union nilfs_binfo *binfo)
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{
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struct inode *dat = nilfs_bmap_get_dat(&direct->d_bmap);
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union nilfs_bmap_ptr_req req;
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int ret;
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req.bpr_ptr = ptr;
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ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
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if (!ret) {
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nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
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binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr);
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binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key);
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}
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return ret;
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}
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static int nilfs_direct_assign_p(struct nilfs_direct *direct,
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__u64 key, __u64 ptr,
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struct buffer_head **bh,
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sector_t blocknr,
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union nilfs_binfo *binfo)
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{
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nilfs_direct_set_ptr(direct, key, blocknr);
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binfo->bi_dat.bi_blkoff = nilfs_bmap_key_to_dkey(key);
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binfo->bi_dat.bi_level = 0;
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return 0;
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}
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static int nilfs_direct_assign(struct nilfs_bmap *bmap,
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struct buffer_head **bh,
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sector_t blocknr,
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union nilfs_binfo *binfo)
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{
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struct nilfs_direct *direct;
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__u64 key;
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__u64 ptr;
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direct = (struct nilfs_direct *)bmap;
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key = nilfs_bmap_data_get_key(bmap, *bh);
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if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
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printk(KERN_CRIT "%s: invalid key: %llu\n", __func__,
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(unsigned long long)key);
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return -EINVAL;
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}
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ptr = nilfs_direct_get_ptr(direct, key);
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if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
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printk(KERN_CRIT "%s: invalid pointer: %llu\n", __func__,
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(unsigned long long)ptr);
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return -EINVAL;
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}
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return NILFS_BMAP_USE_VBN(bmap) ?
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||
|
|
nilfs_direct_assign_v(direct, key, ptr, bh, blocknr, binfo) :
|
||
|
|
nilfs_direct_assign_p(direct, key, ptr, bh, blocknr, binfo);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct nilfs_bmap_operations nilfs_direct_ops = {
|
||
|
|
.bop_lookup = nilfs_direct_lookup,
|
||
|
|
.bop_lookup_contig = nilfs_direct_lookup_contig,
|
||
|
|
.bop_insert = nilfs_direct_insert,
|
||
|
|
.bop_delete = nilfs_direct_delete,
|
||
|
|
.bop_clear = NULL,
|
||
|
|
|
||
|
|
.bop_propagate = nilfs_direct_propagate,
|
||
|
|
|
||
|
|
.bop_lookup_dirty_buffers = NULL,
|
||
|
|
|
||
|
|
.bop_assign = nilfs_direct_assign,
|
||
|
|
.bop_mark = NULL,
|
||
|
|
|
||
|
|
.bop_last_key = nilfs_direct_last_key,
|
||
|
|
.bop_check_insert = nilfs_direct_check_insert,
|
||
|
|
.bop_check_delete = NULL,
|
||
|
|
.bop_gather_data = nilfs_direct_gather_data,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
int nilfs_direct_init(struct nilfs_bmap *bmap)
|
||
|
|
{
|
||
|
|
bmap->b_ops = &nilfs_direct_ops;
|
||
|
|
return 0;
|
||
|
|
}
|