dnode.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:29k
- /*
- * 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_foundn");
- return ((loff_t)d->self << 4) | (loff_t)1;
- }
- void hpfs_add_pos(struct inode *inode, loff_t *pos)
- {
- int i = 0;
- loff_t **ppos;
- if (inode->i_hpfs_rddir_off)
- for (; inode->i_hpfs_rddir_off[i]; i++)
- if (inode->i_hpfs_rddir_off[i] == pos) return;
- if (!(i&0x0f)) {
- if (!(ppos = kmalloc((i+0x11) * sizeof(loff_t*), GFP_KERNEL))) {
- printk("HPFS: out of memory for position listn");
- return;
- }
- if (inode->i_hpfs_rddir_off) {
- memcpy(ppos, inode->i_hpfs_rddir_off, i * sizeof(loff_t));
- kfree(inode->i_hpfs_rddir_off);
- }
- inode->i_hpfs_rddir_off = ppos;
- }
- inode->i_hpfs_rddir_off[i] = pos;
- inode->i_hpfs_rddir_off[i + 1] = NULL;
- }
- void hpfs_del_pos(struct inode *inode, loff_t *pos)
- {
- loff_t **i, **j;
- if (!inode->i_hpfs_rddir_off) goto not_f;
- for (i = inode->i_hpfs_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 == inode->i_hpfs_rddir_off) {
- kfree(inode->i_hpfs_rddir_off);
- inode->i_hpfs_rddir_off = NULL;
- }
- return;
- not_f:
- /*printk("HPFS: warning: position pointer %p->%08x not foundn", 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)
- {
- loff_t **i;
- if (!inode->i_hpfs_rddir_off) return;
- for (i = inode->i_hpfs_rddir_off; *i; i++) (*f)(*i, p1, p2);
- return;
- }
- 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);
- }*/
- 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 + %dn", (int)*p, (int)c >> 8);
- else *p = (*p & ~0x3f) | n;
- }
- }
- 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 - %dn", (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 (s->s_hpfs_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 it's subtree */
- 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 */
- 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_KERNEL))) {
- printk("HPFS: out of memory, can't add to dnoden");
- 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 (i->i_sb->s_hpfs_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_KERNEL))) {
- /* 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 splittingn");
- 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 = i->i_hpfs_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 dnode *d;
- struct hpfs_dirent *de, *de_end;
- struct quad_buffer_head qbh;
- dnode_secno dno;
- int c;
- int c1, c2 = 0;
- dno = i->i_hpfs_dno;
- down:
- if (i->i_sb->s_hpfs_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 = ++event;
- 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 (i->i_sb->s_hpfs_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 (i->i_sb->s_hpfs_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_KERNEL))) {
- 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 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 (i->i_sb->s_hpfs_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 (i->i_sb->s_hpfs_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);
- }
- i->i_hpfs_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_KERNEL))) {
- printk("HPFS: out of memory for dtree balancingn");
- 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 (i->i_sb->s_hpfs_chk >= 2) {
- printk("HPFS: warning: unbalanced dnode tree, see hpfs.txt 4 more infon");
- printk("HPFS: warning: terminating balancing operationn");
- }
- hpfs_brelse4(&qbh1);
- goto endm;
- }
- if (i->i_sb->s_hpfs_chk >= 2) {
- printk("HPFS: warning: unbalanced dnode tree, see hpfs.txt 4 more infon");
- printk("HPFS: warning: goin'onn");
- }
- 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_KERNEL))) {
- printk("HPFS: out of memory for dtree balancingn");
- 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 = ++event;
- 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 (s->s_hpfs_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 (s->s_hpfs_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 (s->s_hpfs_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 (s->s_hpfs_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 (s->s_hpfs_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 directoryn");
- again:
- if (inode->i_sb->s_hpfs_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_KERNEL))) {
- printk("HPFS: out of memory, can't map direntn");
- 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 (s->s_hpfs_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 (s->s_hpfs_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;
- }