diff options
Diffstat (limited to 'fs/hpfs/dnode.c')
| -rw-r--r-- | fs/hpfs/dnode.c | 1080 |
1 files changed, 1080 insertions, 0 deletions
diff --git a/fs/hpfs/dnode.c b/fs/hpfs/dnode.c new file mode 100644 index 0000000..1d21307 --- /dev/null +++ b/fs/hpfs/dnode.c @@ -0,0 +1,1080 @@ +/* + * linux/fs/hpfs/dnode.c + * + * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 + * + * handling directory dnode tree - adding, deleteing & searching for dirents + */ + +#include "hpfs_fn.h" + +static loff_t get_pos(struct dnode *d, struct hpfs_dirent *fde) +{ + struct hpfs_dirent *de; + struct hpfs_dirent *de_end = dnode_end_de(d); + int i = 1; + for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { + if (de == fde) return ((loff_t) d->self << 4) | (loff_t)i; + i++; + } + printk("HPFS: get_pos: not_found\n"); + return ((loff_t)d->self << 4) | (loff_t)1; +} + +void hpfs_add_pos(struct inode *inode, loff_t *pos) +{ + struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); + int i = 0; + loff_t **ppos; + + if (hpfs_inode->i_rddir_off) + for (; hpfs_inode->i_rddir_off[i]; i++) + if (hpfs_inode->i_rddir_off[i] == pos) return; + if (!(i&0x0f)) { + if (!(ppos = kmalloc((i+0x11) * sizeof(loff_t*), GFP_NOFS))) { + printk("HPFS: out of memory for position list\n"); + return; + } + if (hpfs_inode->i_rddir_off) { + memcpy(ppos, hpfs_inode->i_rddir_off, i * sizeof(loff_t)); + kfree(hpfs_inode->i_rddir_off); + } + hpfs_inode->i_rddir_off = ppos; + } + hpfs_inode->i_rddir_off[i] = pos; + hpfs_inode->i_rddir_off[i + 1] = NULL; +} + +void hpfs_del_pos(struct inode *inode, loff_t *pos) +{ + struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); + loff_t **i, **j; + + if (!hpfs_inode->i_rddir_off) goto not_f; + for (i = hpfs_inode->i_rddir_off; *i; i++) if (*i == pos) goto fnd; + goto not_f; + fnd: + for (j = i + 1; *j; j++) ; + *i = *(j - 1); + *(j - 1) = NULL; + if (j - 1 == hpfs_inode->i_rddir_off) { + kfree(hpfs_inode->i_rddir_off); + hpfs_inode->i_rddir_off = NULL; + } + return; + not_f: + /*printk("HPFS: warning: position pointer %p->%08x not found\n", pos, (int)*pos);*/ + return; +} + +static void for_all_poss(struct inode *inode, void (*f)(loff_t *, loff_t, loff_t), + loff_t p1, loff_t p2) +{ + struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); + loff_t **i; + + if (!hpfs_inode->i_rddir_off) return; + for (i = hpfs_inode->i_rddir_off; *i; i++) (*f)(*i, p1, p2); + return; +} + +static void hpfs_pos_subst(loff_t *p, loff_t f, loff_t t) +{ + if (*p == f) *p = t; +} + +/*void hpfs_hpfs_pos_substd(loff_t *p, loff_t f, loff_t t) +{ + if ((*p & ~0x3f) == (f & ~0x3f)) *p = (t & ~0x3f) | (*p & 0x3f); +}*/ + +static void hpfs_pos_ins(loff_t *p, loff_t d, loff_t c) +{ + if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) { + int n = (*p & 0x3f) + c; + if (n > 0x3f) printk("HPFS: hpfs_pos_ins: %08x + %d\n", (int)*p, (int)c >> 8); + else *p = (*p & ~0x3f) | n; + } +} + +static void hpfs_pos_del(loff_t *p, loff_t d, loff_t c) +{ + if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) { + int n = (*p & 0x3f) - c; + if (n < 1) printk("HPFS: hpfs_pos_ins: %08x - %d\n", (int)*p, (int)c >> 8); + else *p = (*p & ~0x3f) | n; + } +} + +static struct hpfs_dirent *dnode_pre_last_de(struct dnode *d) +{ + struct hpfs_dirent *de, *de_end, *dee = NULL, *deee = NULL; + de_end = dnode_end_de(d); + for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { + deee = dee; dee = de; + } + return deee; +} + +static struct hpfs_dirent *dnode_last_de(struct dnode *d) +{ + struct hpfs_dirent *de, *de_end, *dee = NULL; + de_end = dnode_end_de(d); + for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { + dee = de; + } + return dee; +} + +static void set_last_pointer(struct super_block *s, struct dnode *d, dnode_secno ptr) +{ + struct hpfs_dirent *de; + if (!(de = dnode_last_de(d))) { + hpfs_error(s, "set_last_pointer: empty dnode %08x", d->self); + return; + } + if (hpfs_sb(s)->sb_chk) { + if (de->down) { + hpfs_error(s, "set_last_pointer: dnode %08x has already last pointer %08x", + d->self, de_down_pointer(de)); + return; + } + if (de->length != 32) { + hpfs_error(s, "set_last_pointer: bad last dirent in dnode %08x", d->self); + return; + } + } + if (ptr) { + if ((d->first_free += 4) > 2048) { + hpfs_error(s,"set_last_pointer: too long dnode %08x", d->self); + d->first_free -= 4; + return; + } + de->length = 36; + de->down = 1; + *(dnode_secno *)((char *)de + 32) = ptr; + } +} + +/* Add an entry to dnode and don't care if it grows over 2048 bytes */ + +struct hpfs_dirent *hpfs_add_de(struct super_block *s, struct dnode *d, unsigned char *name, + unsigned namelen, secno down_ptr) +{ + struct hpfs_dirent *de; + struct hpfs_dirent *de_end = dnode_end_de(d); + unsigned d_size = de_size(namelen, down_ptr); + for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { + int c = hpfs_compare_names(s, name, namelen, de->name, de->namelen, de->last); + if (!c) { + hpfs_error(s, "name (%c,%d) already exists in dnode %08x", *name, namelen, d->self); + return NULL; + } + if (c < 0) break; + } + memmove((char *)de + d_size, de, (char *)de_end - (char *)de); + memset(de, 0, d_size); + if (down_ptr) { + *(int *)((char *)de + d_size - 4) = down_ptr; + de->down = 1; + } + de->length = d_size; + if (down_ptr) de->down = 1; + de->not_8x3 = hpfs_is_name_long(name, namelen); + de->namelen = namelen; + memcpy(de->name, name, namelen); + d->first_free += d_size; + return de; +} + +/* Delete dirent and don't care about its subtree */ + +static void hpfs_delete_de(struct super_block *s, struct dnode *d, + struct hpfs_dirent *de) +{ + if (de->last) { + hpfs_error(s, "attempt to delete last dirent in dnode %08x", d->self); + return; + } + d->first_free -= de->length; + memmove(de, de_next_de(de), d->first_free + (char *)d - (char *)de); +} + +static void fix_up_ptrs(struct super_block *s, struct dnode *d) +{ + struct hpfs_dirent *de; + struct hpfs_dirent *de_end = dnode_end_de(d); + dnode_secno dno = d->self; + for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) + if (de->down) { + struct quad_buffer_head qbh; + struct dnode *dd; + if ((dd = hpfs_map_dnode(s, de_down_pointer(de), &qbh))) { + if (dd->up != dno || dd->root_dnode) { + dd->up = dno; + dd->root_dnode = 0; + hpfs_mark_4buffers_dirty(&qbh); + } + hpfs_brelse4(&qbh); + } + } +} + +/* Add an entry to dnode and do dnode splitting if required */ + +static int hpfs_add_to_dnode(struct inode *i, dnode_secno dno, + unsigned char *name, unsigned namelen, + struct hpfs_dirent *new_de, dnode_secno down_ptr) +{ + struct quad_buffer_head qbh, qbh1, qbh2; + struct dnode *d, *ad, *rd, *nd = NULL; + dnode_secno adno, rdno; + struct hpfs_dirent *de; + struct hpfs_dirent nde; + char *nname; + int h; + int pos; + struct buffer_head *bh; + struct fnode *fnode; + int c1, c2 = 0; + if (!(nname = kmalloc(256, GFP_NOFS))) { + printk("HPFS: out of memory, can't add to dnode\n"); + return 1; + } + go_up: + if (namelen >= 256) { + hpfs_error(i->i_sb, "hpfs_add_to_dnode: namelen == %d", namelen); + if (nd) kfree(nd); + kfree(nname); + return 1; + } + if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) { + if (nd) kfree(nd); + kfree(nname); + return 1; + } + go_up_a: + if (hpfs_sb(i->i_sb)->sb_chk) + if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_to_dnode")) { + hpfs_brelse4(&qbh); + if (nd) kfree(nd); + kfree(nname); + return 1; + } + if (d->first_free + de_size(namelen, down_ptr) <= 2048) { + loff_t t; + copy_de(de=hpfs_add_de(i->i_sb, d, name, namelen, down_ptr), new_de); + t = get_pos(d, de); + for_all_poss(i, hpfs_pos_ins, t, 1); + for_all_poss(i, hpfs_pos_subst, 4, t); + for_all_poss(i, hpfs_pos_subst, 5, t + 1); + hpfs_mark_4buffers_dirty(&qbh); + hpfs_brelse4(&qbh); + if (nd) kfree(nd); + kfree(nname); + return 0; + } + if (!nd) if (!(nd = kmalloc(0x924, GFP_NOFS))) { + /* 0x924 is a max size of dnode after adding a dirent with + max name length. We alloc this only once. There must + not be any error while splitting dnodes, otherwise the + whole directory, not only file we're adding, would + be lost. */ + printk("HPFS: out of memory for dnode splitting\n"); + hpfs_brelse4(&qbh); + kfree(nname); + return 1; + } + memcpy(nd, d, d->first_free); + copy_de(de = hpfs_add_de(i->i_sb, nd, name, namelen, down_ptr), new_de); + for_all_poss(i, hpfs_pos_ins, get_pos(nd, de), 1); + h = ((char *)dnode_last_de(nd) - (char *)nd) / 2 + 10; + if (!(ad = hpfs_alloc_dnode(i->i_sb, d->up, &adno, &qbh1, 0))) { + hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted"); + hpfs_brelse4(&qbh); + kfree(nd); + kfree(nname); + return 1; + } + i->i_size += 2048; + i->i_blocks += 4; + pos = 1; + for (de = dnode_first_de(nd); (char *)de_next_de(de) - (char *)nd < h; de = de_next_de(de)) { + copy_de(hpfs_add_de(i->i_sb, ad, de->name, de->namelen, de->down ? de_down_pointer(de) : 0), de); + for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, ((loff_t)adno << 4) | pos); + pos++; + } + copy_de(new_de = &nde, de); + memcpy(name = nname, de->name, namelen = de->namelen); + for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, 4); + down_ptr = adno; + set_last_pointer(i->i_sb, ad, de->down ? de_down_pointer(de) : 0); + de = de_next_de(de); + memmove((char *)nd + 20, de, nd->first_free + (char *)nd - (char *)de); + nd->first_free -= (char *)de - (char *)nd - 20; + memcpy(d, nd, nd->first_free); + for_all_poss(i, hpfs_pos_del, (loff_t)dno << 4, pos); + fix_up_ptrs(i->i_sb, ad); + if (!d->root_dnode) { + dno = ad->up = d->up; + hpfs_mark_4buffers_dirty(&qbh); + hpfs_brelse4(&qbh); + hpfs_mark_4buffers_dirty(&qbh1); + hpfs_brelse4(&qbh1); + goto go_up; + } + if (!(rd = hpfs_alloc_dnode(i->i_sb, d->up, &rdno, &qbh2, 0))) { + hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted"); + hpfs_brelse4(&qbh); + hpfs_brelse4(&qbh1); + kfree(nd); + kfree(nname); + return 1; + } + i->i_size += 2048; + i->i_blocks += 4; + rd->root_dnode = 1; + rd->up = d->up; + if (!(fnode = hpfs_map_fnode(i->i_sb, d->up, &bh))) { + hpfs_free_dnode(i->i_sb, rdno); + hpfs_brelse4(&qbh); + hpfs_brelse4(&qbh1); + hpfs_brelse4(&qbh2); + kfree(nd); + kfree(nname); + return 1; + } + fnode->u.external[0].disk_secno = rdno; + mark_buffer_dirty(bh); + brelse(bh); + d->up = ad->up = hpfs_i(i)->i_dno = rdno; + d->root_dnode = ad->root_dnode = 0; + hpfs_mark_4buffers_dirty(&qbh); + hpfs_brelse4(&qbh); + hpfs_mark_4buffers_dirty(&qbh1); + hpfs_brelse4(&qbh1); + qbh = qbh2; + set_last_pointer(i->i_sb, rd, dno); + dno = rdno; + d = rd; + goto go_up_a; +} + +/* + * Add an entry to directory btree. + * I hate such crazy directory structure. + * It's easy to read but terrible to write. + * I wrote this directory code 4 times. + * I hope, now it's finally bug-free. + */ + +int hpfs_add_dirent(struct inode *i, unsigned char *name, unsigned namelen, + struct hpfs_dirent *new_de, int cdepth) +{ + struct hpfs_inode_info *hpfs_inode = hpfs_i(i); + struct dnode *d; + struct hpfs_dirent *de, *de_end; + struct quad_buffer_head qbh; + dnode_secno dno; + int c; + int c1, c2 = 0; + dno = hpfs_inode->i_dno; + down: + if (hpfs_sb(i->i_sb)->sb_chk) + if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_dirent")) return 1; + if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 1; + de_end = dnode_end_de(d); + for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { + if (!(c = hpfs_compare_names(i->i_sb, name, namelen, de->name, de->namelen, de->last))) { + hpfs_brelse4(&qbh); + return -1; + } + if (c < 0) { + if (de->down) { + dno = de_down_pointer(de); + hpfs_brelse4(&qbh); + goto down; + } + break; + } + } + hpfs_brelse4(&qbh); + if (!cdepth) hpfs_lock_creation(i->i_sb); + if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_ADD)) { + c = 1; + goto ret; + } + i->i_version++; + c = hpfs_add_to_dnode(i, dno, name, namelen, new_de, 0); + ret: + if (!cdepth) hpfs_unlock_creation(i->i_sb); + return c; +} + +/* + * Find dirent with higher name in 'from' subtree and move it to 'to' dnode. + * Return the dnode we moved from (to be checked later if it's empty) + */ + +static secno move_to_top(struct inode *i, dnode_secno from, dnode_secno to) +{ + dnode_secno dno, ddno; + dnode_secno chk_up = to; + struct dnode *dnode; + struct quad_buffer_head qbh; + struct hpfs_dirent *de, *nde; + int a; + loff_t t; + int c1, c2 = 0; + dno = from; + while (1) { + if (hpfs_sb(i->i_sb)->sb_chk) + if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "move_to_top")) + return 0; + if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 0; + if (hpfs_sb(i->i_sb)->sb_chk) { + if (dnode->up != chk_up) { + hpfs_error(i->i_sb, "move_to_top: up pointer from %08x should be %08x, is %08x", + dno, chk_up, dnode->up); + hpfs_brelse4(&qbh); + return 0; + } + chk_up = dno; + } + if (!(de = dnode_last_de(dnode))) { + hpfs_error(i->i_sb, "move_to_top: dnode %08x has no last de", dno); + hpfs_brelse4(&qbh); + return 0; + } + if (!de->down) break; + dno = de_down_pointer(de); + hpfs_brelse4(&qbh); + } + while (!(de = dnode_pre_last_de(dnode))) { + dnode_secno up = dnode->up; + hpfs_brelse4(&qbh); + hpfs_free_dnode(i->i_sb, dno); + i->i_size -= 2048; + i->i_blocks -= 4; + for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, 5); + if (up == to) return to; + if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return 0; + if (dnode->root_dnode) { + hpfs_error(i->i_sb, "move_to_top: got to root_dnode while moving from %08x to %08x", from, to); + hpfs_brelse4(&qbh); + return 0; + } + de = dnode_last_de(dnode); + if (!de || !de->down) { + hpfs_error(i->i_sb, "move_to_top: dnode %08x doesn't point down to %08x", up, dno); + hpfs_brelse4(&qbh); + return 0; + } + dnode->first_free -= 4; + de->length -= 4; + de->down = 0; + hpfs_mark_4buffers_dirty(&qbh); + dno = up; + } + t = get_pos(dnode, de); + for_all_poss(i, hpfs_pos_subst, t, 4); + for_all_poss(i, hpfs_pos_subst, t + 1, 5); + if (!(nde = kmalloc(de->length, GFP_NOFS))) { + hpfs_error(i->i_sb, "out of memory for dirent - directory will be corrupted"); + hpfs_brelse4(&qbh); + return 0; + } + memcpy(nde, de, de->length); + ddno = de->down ? de_down_pointer(de) : 0; + hpfs_delete_de(i->i_sb, dnode, de); + set_last_pointer(i->i_sb, dnode, ddno); + hpfs_mark_4buffers_dirty(&qbh); + hpfs_brelse4(&qbh); + a = hpfs_add_to_dnode(i, to, nde->name, nde->namelen, nde, from); + kfree(nde); + if (a) return 0; + return dno; +} + +/* + * Check if a dnode is empty and delete it from the tree + * (chkdsk doesn't like empty dnodes) + */ + +static void delete_empty_dnode(struct inode *i, dnode_secno dno) +{ + struct hpfs_inode_info *hpfs_inode = hpfs_i(i); + struct quad_buffer_head qbh; + struct dnode *dnode; + dnode_secno down, up, ndown; + int p; + struct hpfs_dirent *de; + int c1, c2 = 0; + try_it_again: + if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "delete_empty_dnode")) return; + if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return; + if (dnode->first_free > 56) goto end; + if (dnode->first_free == 52 || dnode->first_free == 56) { + struct hpfs_dirent *de_end; + int root = dnode->root_dnode; + up = dnode->up; + de = dnode_first_de(dnode); + down = de->down ? de_down_pointer(de) : 0; + if (hpfs_sb(i->i_sb)->sb_chk) if (root && !down) { + hpfs_error(i->i_sb, "delete_empty_dnode: root dnode %08x is empty", dno); + goto end; + } + hpfs_brelse4(&qbh); + hpfs_free_dnode(i->i_sb, dno); + i->i_size -= 2048; + i->i_blocks -= 4; + if (root) { + struct fnode *fnode; + struct buffer_head *bh; + struct dnode *d1; + struct quad_buffer_head qbh1; + if (hpfs_sb(i->i_sb)->sb_chk) if (up != i->i_ino) { + hpfs_error(i->i_sb, "bad pointer to fnode, dnode %08x, pointing to %08x, should be %08x", dno, up, i->i_ino); + return; + } + if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) { + d1->up = up; + d1->root_dnode = 1; + hpfs_mark_4buffers_dirty(&qbh1); + hpfs_brelse4(&qbh1); + } + if ((fnode = hpfs_map_fnode(i->i_sb, up, &bh))) { + fnode->u.external[0].disk_secno = down; + mark_buffer_dirty(bh); + brelse(bh); + } + hpfs_inode->i_dno = down; + for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, (loff_t) 12); + return; + } + if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return; + p = 1; + de_end = dnode_end_de(dnode); + for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de), p++) + if (de->down) if (de_down_pointer(de) == dno) goto fnd; + hpfs_error(i->i_sb, "delete_empty_dnode: pointer to dnode %08x not found in dnode %08x", dno, up); + goto end; + fnd: + for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, ((loff_t)up << 4) | p); + if (!down) { + de->down = 0; + de->length -= 4; + dnode->first_free -= 4; + memmove(de_next_de(de), (char *)de_next_de(de) + 4, + (char *)dnode + dnode->first_free - (char *)de_next_de(de)); + } else { + struct dnode *d1; + struct quad_buffer_head qbh1; + *(dnode_secno *) ((void *) de + de->length - 4) = down; + if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) { + d1->up = up; + hpfs_mark_4buffers_dirty(&qbh1); + hpfs_brelse4(&qbh1); + } + } + } else { + hpfs_error(i->i_sb, "delete_empty_dnode: dnode %08x, first_free == %03x", dno, dnode->first_free); + goto end; + } + + if (!de->last) { + struct hpfs_dirent *de_next = de_next_de(de); + struct hpfs_dirent *de_cp; + struct dnode *d1; + struct quad_buffer_head qbh1; + if (!de_next->down) goto endm; + ndown = de_down_pointer(de_next); + if (!(de_cp = kmalloc(de->length, GFP_NOFS))) { + printk("HPFS: out of memory for dtree balancing\n"); + goto endm; + } + memcpy(de_cp, de, de->length); + hpfs_delete_de(i->i_sb, dnode, de); + hpfs_mark_4buffers_dirty(&qbh); + hpfs_brelse4(&qbh); + for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, 4); + for_all_poss(i, hpfs_pos_del, ((loff_t)up << 4) | p, 1); + if (de_cp->down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de_cp), &qbh1))) { + d1->up = ndown; + hpfs_mark_4buffers_dirty(&qbh1); + hpfs_brelse4(&qbh1); + } + hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, de_cp->down ? de_down_pointer(de_cp) : 0); + /*printk("UP-TO-DNODE: %08x (ndown = %08x, down = %08x, dno = %08x)\n", up, ndown, down, dno);*/ + dno = up; + kfree(de_cp); + goto try_it_again; + } else { + struct hpfs_dirent *de_prev = dnode_pre_last_de(dnode); + struct hpfs_dirent *de_cp; + struct dnode *d1; + struct quad_buffer_head qbh1; + dnode_secno dlp; + if (!de_prev) { + hpfs_error(i->i_sb, "delete_empty_dnode: empty dnode %08x", up); + hpfs_mark_4buffers_dirty(&qbh); + hpfs_brelse4(&qbh); + dno = up; + goto try_it_again; + } + if (!de_prev->down) goto endm; + ndown = de_down_pointer(de_prev); + if ((d1 = hpfs_map_dnode(i->i_sb, ndown, &qbh1))) { + struct hpfs_dirent *del = dnode_last_de(d1); + dlp = del->down ? de_down_pointer(del) : 0; + if (!dlp && down) { + if (d1->first_free > 2044) { + if (hpfs_sb(i->i_sb)->sb_chk >= 2) { + printk("HPFS: warning: unbalanced dnode tree, see hpfs.txt 4 more info\n"); + printk("HPFS: warning: terminating balancing operation\n"); + } + hpfs_brelse4(&qbh1); + goto endm; + } + if (hpfs_sb(i->i_sb)->sb_chk >= 2) { + printk("HPFS: warning: unbalanced dnode tree, see hpfs.txt 4 more info\n"); + printk("HPFS: warning: goin'on\n"); + } + del->length += 4; + del->down = 1; + d1->first_free += 4; + } + if (dlp && !down) { + del->length -= 4; + del->down = 0; + d1->first_free -= 4; + } else if (down) + *(dnode_secno *) ((void *) del + del->length - 4) = down; + } else goto endm; + if (!(de_cp = kmalloc(de_prev->length, GFP_NOFS))) { + printk("HPFS: out of memory for dtree balancing\n"); + hpfs_brelse4(&qbh1); + goto endm; + } + hpfs_mark_4buffers_dirty(&qbh1); + hpfs_brelse4(&qbh1); + memcpy(de_cp, de_prev, de_prev->length); + hpfs_delete_de(i->i_sb, dnode, de_prev); + if (!de_prev->down) { + de_prev->length += 4; + de_prev->down = 1; + dnode->first_free += 4; + } + *(dnode_secno *) ((void *) de_prev + de_prev->length - 4) = ndown; + hpfs_mark_4buffers_dirty(&qbh); + hpfs_brelse4(&qbh); + for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | (p - 1), 4); + for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, ((loff_t)up << 4) | (p - 1)); + if (down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de), &qbh1))) { + d1->up = ndown; + hpfs_mark_4buffers_dirty(&qbh1); + hpfs_brelse4(&qbh1); + } + hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, dlp); + dno = up; + kfree(de_cp); + goto try_it_again; + } + endm: + hpfs_mark_4buffers_dirty(&qbh); + end: + hpfs_brelse4(&qbh); +} + + +/* Delete dirent from directory */ + +int hpfs_remove_dirent(struct inode *i, dnode_secno dno, struct hpfs_dirent *de, + struct quad_buffer_head *qbh, int depth) +{ + struct dnode *dnode = qbh->data; + dnode_secno down = 0; + int lock = 0; + loff_t t; + if (de->first || de->last) { + hpfs_error(i->i_sb, "hpfs_remove_dirent: attempt to delete first or last dirent in dnode %08x", dno); + hpfs_brelse4(qbh); + return 1; + } + if (de->down) down = de_down_pointer(de); + if (depth && (de->down || (de == dnode_first_de(dnode) && de_next_de(de)->last))) { + lock = 1; + hpfs_lock_creation(i->i_sb); + if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_DEL)) { + hpfs_brelse4(qbh); + hpfs_unlock_creation(i->i_sb); + return 2; + } + } + i->i_version++; + for_all_poss(i, hpfs_pos_del, (t = get_pos(dnode, de)) + 1, 1); + hpfs_delete_de(i->i_sb, dnode, de); + hpfs_mark_4buffers_dirty(qbh); + hpfs_brelse4(qbh); + if (down) { + dnode_secno a = move_to_top(i, down, dno); + for_all_poss(i, hpfs_pos_subst, 5, t); + if (a) delete_empty_dnode(i, a); + if (lock) hpfs_unlock_creation(i->i_sb); + return !a; + } + delete_empty_dnode(i, dno); + if (lock) hpfs_unlock_creation(i->i_sb); + return 0; +} + +void hpfs_count_dnodes(struct super_block *s, dnode_secno dno, int *n_dnodes, + int *n_subdirs, int *n_items) +{ + struct dnode *dnode; + struct quad_buffer_head qbh; + struct hpfs_dirent *de; + dnode_secno ptr, odno = 0; + int c1, c2 = 0; + int d1, d2 = 0; + go_down: + if (n_dnodes) (*n_dnodes)++; + if (hpfs_sb(s)->sb_chk) + if (hpfs_stop_cycles(s, dno, &c1, &c2, "hpfs_count_dnodes #1")) return; + ptr = 0; + go_up: + if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return; + if (hpfs_sb(s)->sb_chk) if (odno && odno != -1 && dnode->up != odno) + hpfs_error(s, "hpfs_count_dnodes: bad up pointer; dnode %08x, down %08x points to %08x", odno, dno, dnode->up); + de = dnode_first_de(dnode); + if (ptr) while(1) { + if (de->down) if (de_down_pointer(de) == ptr) goto process_de; + if (de->last) { + hpfs_brelse4(&qbh); + hpfs_error(s, "hpfs_count_dnodes: pointer to dnode %08x not found in dnode %08x, got here from %08x", + ptr, dno, odno); + return; + } + de = de_next_de(de); + } + next_de: + if (de->down) { + odno = dno; + dno = de_down_pointer(de); + hpfs_brelse4(&qbh); + goto go_down; + } + process_de: + if (!de->first && !de->last && de->directory && n_subdirs) (*n_subdirs)++; + if (!de->first && !de->last && n_items) (*n_items)++; + if ((de = de_next_de(de)) < dnode_end_de(dnode)) goto next_de; + ptr = dno; + dno = dnode->up; + if (dnode->root_dnode) { + hpfs_brelse4(&qbh); + return; + } + hpfs_brelse4(&qbh); + if (hpfs_sb(s)->sb_chk) + if (hpfs_stop_cycles(s, ptr, &d1, &d2, "hpfs_count_dnodes #2")) return; + odno = -1; + goto go_up; +} + +static struct hpfs_dirent *map_nth_dirent(struct super_block *s, dnode_secno dno, int n, + struct quad_buffer_head *qbh, struct dnode **dn) +{ + int i; + struct hpfs_dirent *de, *de_end; + struct dnode *dnode; + dnode = hpfs_map_dnode(s, dno, qbh); + if (!dnode) return NULL; + if (dn) *dn=dnode; + de = dnode_first_de(dnode); + de_end = dnode_end_de(dnode); + for (i = 1; de < de_end; i++, de = de_next_de(de)) { + if (i == n) { + return de; + } + if (de->last) break; + } + hpfs_brelse4(qbh); + hpfs_error(s, "map_nth_dirent: n too high; dnode = %08x, requested %08x", dno, n); + return NULL; +} + +dnode_secno hpfs_de_as_down_as_possible(struct super_block *s, dnode_secno dno) +{ + struct quad_buffer_head qbh; + dnode_secno d = dno; + dnode_secno up = 0; + struct hpfs_dirent *de; + int c1, c2 = 0; + + again: + if (hpfs_sb(s)->sb_chk) + if (hpfs_stop_cycles(s, d, &c1, &c2, "hpfs_de_as_down_as_possible")) + return d; + if (!(de = map_nth_dirent(s, d, 1, &qbh, NULL))) return dno; + if (hpfs_sb(s)->sb_chk) + if (up && ((struct dnode *)qbh.data)->up != up) + hpfs_error(s, "hpfs_de_as_down_as_possible: bad up pointer; dnode %08x, down %08x points to %08x", up, d, ((struct dnode *)qbh.data)->up); + if (!de->down) { + hpfs_brelse4(&qbh); + return d; + } + up = d; + d = de_down_pointer(de); + hpfs_brelse4(&qbh); + goto again; +} + +struct hpfs_dirent *map_pos_dirent(struct inode *inode, loff_t *posp, + struct quad_buffer_head *qbh) +{ + loff_t pos; + unsigned c; + dnode_secno dno; + struct hpfs_dirent *de, *d; + struct hpfs_dirent *up_de; + struct hpfs_dirent *end_up_de; + struct dnode *dnode; + struct dnode *up_dnode; + struct quad_buffer_head qbh0; + + pos = *posp; + dno = pos >> 6 << 2; + pos &= 077; + if (!(de = map_nth_dirent(inode->i_sb, dno, pos, qbh, &dnode))) + goto bail; + + /* Going to the next dirent */ + if ((d = de_next_de(de)) < dnode_end_de(dnode)) { + if (!(++*posp & 077)) { + hpfs_error(inode->i_sb, "map_pos_dirent: pos crossed dnode boundary; pos = %08x", *posp); + goto bail; + } + /* We're going down the tree */ + if (d->down) { + *posp = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, de_down_pointer(d)) << 4) + 1; + } + + return de; + } + + /* Going up */ + if (dnode->root_dnode) goto bail; + + if (!(up_dnode = hpfs_map_dnode(inode->i_sb, dnode->up, &qbh0))) + goto bail; + + end_up_de = dnode_end_de(up_dnode); + c = 0; + for (up_de = dnode_first_de(up_dnode); up_de < end_up_de; + up_de = de_next_de(up_de)) { + if (!(++c & 077)) hpfs_error(inode->i_sb, + "map_pos_dirent: pos crossed dnode boundary; dnode = %08x", dnode->up); + if (up_de->down && de_down_pointer(up_de) == dno) { + *posp = ((loff_t) dnode->up << 4) + c; + hpfs_brelse4(&qbh0); + return de; + } + } + + hpfs_error(inode->i_sb, "map_pos_dirent: pointer to dnode %08x not found in parent dnode %08x", + dno, dnode->up); + hpfs_brelse4(&qbh0); + + bail: + *posp = 12; + return de; +} + +/* Find a dirent in tree */ + +struct hpfs_dirent *map_dirent(struct inode *inode, dnode_secno dno, char *name, unsigned len, + dnode_secno *dd, struct quad_buffer_head *qbh) +{ + struct dnode *dnode; + struct hpfs_dirent *de; + struct hpfs_dirent *de_end; + int c1, c2 = 0; + + if (!S_ISDIR(inode->i_mode)) hpfs_error(inode->i_sb, "map_dirent: not a directory\n"); + again: + if (hpfs_sb(inode->i_sb)->sb_chk) + if (hpfs_stop_cycles(inode->i_sb, dno, &c1, &c2, "map_dirent")) return NULL; + if (!(dnode = hpfs_map_dnode(inode->i_sb, dno, qbh))) return NULL; + + de_end = dnode_end_de(dnode); + for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de)) { + int t = hpfs_compare_names(inode->i_sb, name, len, de->name, de->namelen, de->last); + if (!t) { + if (dd) *dd = dno; + return de; + } + if (t < 0) { + if (de->down) { + dno = de_down_pointer(de); + hpfs_brelse4(qbh); + goto again; + } + break; + } + } + hpfs_brelse4(qbh); + return NULL; +} + +/* + * Remove empty directory. In normal cases it is only one dnode with two + * entries, but we must handle also such obscure cases when it's a tree + * of empty dnodes. + */ + +void hpfs_remove_dtree(struct super_block *s, dnode_secno dno) +{ + struct quad_buffer_head qbh; + struct dnode *dnode; + struct hpfs_dirent *de; + dnode_secno d1, d2, rdno = dno; + while (1) { + if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return; + de = dnode_first_de(dnode); + if (de->last) { + if (de->down) d1 = de_down_pointer(de); + else goto error; + hpfs_brelse4(&qbh); + hpfs_free_dnode(s, dno); + dno = d1; + } else break; + } + if (!de->first) goto error; + d1 = de->down ? de_down_pointer(de) : 0; + de = de_next_de(de); + if (!de->last) goto error; + d2 = de->down ? de_down_pointer(de) : 0; + hpfs_brelse4(&qbh); + hpfs_free_dnode(s, dno); + do { + while (d1) { + if (!(dnode = hpfs_map_dnode(s, dno = d1, &qbh))) return; + de = dnode_first_de(dnode); + if (!de->last) goto error; + d1 = de->down ? de_down_pointer(de) : 0; + hpfs_brelse4(&qbh); + hpfs_free_dnode(s, dno); + } + d1 = d2; + d2 = 0; + } while (d1); + return; + error: + hpfs_brelse4(&qbh); + hpfs_free_dnode(s, dno); + hpfs_error(s, "directory %08x is corrupted or not empty", rdno); +} + +/* + * Find dirent for specified fnode. Use truncated 15-char name in fnode as + * a help for searching. + */ + +struct hpfs_dirent *map_fnode_dirent(struct super_block *s, fnode_secno fno, + struct fnode *f, struct quad_buffer_head *qbh) +{ + char *name1; + char *name2; + int name1len, name2len; + struct dnode *d; + dnode_secno dno, downd; + struct fnode *upf; + struct buffer_head *bh; + struct hpfs_dirent *de, *de_end; + int c; + int c1, c2 = 0; + int d1, d2 = 0; + name1 = f->name; + if (!(name2 = kmalloc(256, GFP_NOFS))) { + printk("HPFS: out of memory, can't map dirent\n"); + return NULL; + } + if (f->len <= 15) + memcpy(name2, name1, name1len = name2len = f->len); + else { + memcpy(name2, name1, 15); + memset(name2 + 15, 0xff, 256 - 15); + /*name2[15] = 0xff;*/ + name1len = 15; name2len = 256; + } + if (!(upf = hpfs_map_fnode(s, f->up, &bh))) { + kfree(name2); + return NULL; + } + if (!upf->dirflag) { + brelse(bh); + hpfs_error(s, "fnode %08x has non-directory parent %08x", fno, f->up); + kfree(name2); + return NULL; + } + dno = upf->u.external[0].disk_secno; + brelse(bh); + go_down: + downd = 0; + go_up: + if (!(d = hpfs_map_dnode(s, dno, qbh))) { + kfree(name2); + return NULL; + } + de_end = dnode_end_de(d); + de = dnode_first_de(d); + if (downd) { + while (de < de_end) { + if (de->down) if (de_down_pointer(de) == downd) goto f; + de = de_next_de(de); + } + hpfs_error(s, "pointer to dnode %08x not found in dnode %08x", downd, dno); + hpfs_brelse4(qbh); + kfree(name2); + return NULL; + } + next_de: + if (de->fnode == fno) { + kfree(name2); + return de; + } + c = hpfs_compare_names(s, name1, name1len, de->name, de->namelen, de->last); + if (c < 0 && de->down) { + dno = de_down_pointer(de); + hpfs_brelse4(qbh); + if (hpfs_sb(s)->sb_chk) + if (hpfs_stop_cycles(s, dno, &c1, &c2, "map_fnode_dirent #1")) { + kfree(name2); + return NULL; + } + goto go_down; + } + f: + if (de->fnode == fno) { + kfree(name2); + return de; + } + c = hpfs_compare_names(s, name2, name2len, de->name, de->namelen, de->last); + if (c < 0 && !de->last) goto not_found; + if ((de = de_next_de(de)) < de_end) goto next_de; + if (d->root_dnode) goto not_found; + downd = dno; + dno = d->up; + hpfs_brelse4(qbh); + if (hpfs_sb(s)->sb_chk) + if (hpfs_stop_cycles(s, downd, &d1, &d2, "map_fnode_dirent #2")) { + kfree(name2); + return NULL; + } + goto go_up; + not_found: + hpfs_brelse4(qbh); + hpfs_error(s, "dirent for fnode %08x not found", fno); + kfree(name2); + return NULL; +} |
