1091 строка
30 KiB
C
1091 строка
30 KiB
C
/*
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* linux/fs/hpfs/dnode.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* handling directory dnode tree - adding, deleteing & searching for dirents
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*/
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#include "hpfs_fn.h"
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static loff_t get_pos(struct dnode *d, struct hpfs_dirent *fde)
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{
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struct hpfs_dirent *de;
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struct hpfs_dirent *de_end = dnode_end_de(d);
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int i = 1;
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for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
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if (de == fde) return ((loff_t) d->self << 4) | (loff_t)i;
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i++;
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}
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printk("HPFS: get_pos: not_found\n");
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return ((loff_t)d->self << 4) | (loff_t)1;
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}
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void hpfs_add_pos(struct inode *inode, loff_t *pos)
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{
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struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
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int i = 0;
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loff_t **ppos;
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if (hpfs_inode->i_rddir_off)
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for (; hpfs_inode->i_rddir_off[i]; i++)
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if (hpfs_inode->i_rddir_off[i] == pos) return;
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if (!(i&0x0f)) {
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if (!(ppos = kmalloc((i+0x11) * sizeof(loff_t*), GFP_NOFS))) {
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printk("HPFS: out of memory for position list\n");
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return;
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}
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if (hpfs_inode->i_rddir_off) {
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memcpy(ppos, hpfs_inode->i_rddir_off, i * sizeof(loff_t));
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kfree(hpfs_inode->i_rddir_off);
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}
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hpfs_inode->i_rddir_off = ppos;
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}
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hpfs_inode->i_rddir_off[i] = pos;
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hpfs_inode->i_rddir_off[i + 1] = NULL;
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}
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void hpfs_del_pos(struct inode *inode, loff_t *pos)
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{
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struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
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loff_t **i, **j;
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if (!hpfs_inode->i_rddir_off) goto not_f;
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for (i = hpfs_inode->i_rddir_off; *i; i++) if (*i == pos) goto fnd;
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goto not_f;
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fnd:
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for (j = i + 1; *j; j++) ;
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*i = *(j - 1);
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*(j - 1) = NULL;
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if (j - 1 == hpfs_inode->i_rddir_off) {
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kfree(hpfs_inode->i_rddir_off);
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hpfs_inode->i_rddir_off = NULL;
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}
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return;
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not_f:
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/*printk("HPFS: warning: position pointer %p->%08x not found\n", pos, (int)*pos);*/
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return;
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}
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static void for_all_poss(struct inode *inode, void (*f)(loff_t *, loff_t, loff_t),
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loff_t p1, loff_t p2)
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{
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struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
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loff_t **i;
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if (!hpfs_inode->i_rddir_off) return;
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for (i = hpfs_inode->i_rddir_off; *i; i++) (*f)(*i, p1, p2);
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return;
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}
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static void hpfs_pos_subst(loff_t *p, loff_t f, loff_t t)
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{
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if (*p == f) *p = t;
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}
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/*void hpfs_hpfs_pos_substd(loff_t *p, loff_t f, loff_t t)
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{
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if ((*p & ~0x3f) == (f & ~0x3f)) *p = (t & ~0x3f) | (*p & 0x3f);
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}*/
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static void hpfs_pos_ins(loff_t *p, loff_t d, loff_t c)
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{
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if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) {
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int n = (*p & 0x3f) + c;
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if (n > 0x3f) printk("HPFS: hpfs_pos_ins: %08x + %d\n", (int)*p, (int)c >> 8);
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else *p = (*p & ~0x3f) | n;
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}
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}
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static void hpfs_pos_del(loff_t *p, loff_t d, loff_t c)
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{
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if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) {
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int n = (*p & 0x3f) - c;
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if (n < 1) printk("HPFS: hpfs_pos_ins: %08x - %d\n", (int)*p, (int)c >> 8);
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else *p = (*p & ~0x3f) | n;
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}
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}
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static struct hpfs_dirent *dnode_pre_last_de(struct dnode *d)
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{
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struct hpfs_dirent *de, *de_end, *dee = NULL, *deee = NULL;
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de_end = dnode_end_de(d);
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for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
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deee = dee; dee = de;
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}
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return deee;
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}
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static struct hpfs_dirent *dnode_last_de(struct dnode *d)
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{
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struct hpfs_dirent *de, *de_end, *dee = NULL;
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de_end = dnode_end_de(d);
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for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
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dee = de;
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}
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return dee;
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}
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static void set_last_pointer(struct super_block *s, struct dnode *d, dnode_secno ptr)
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{
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struct hpfs_dirent *de;
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if (!(de = dnode_last_de(d))) {
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hpfs_error(s, "set_last_pointer: empty dnode %08x", d->self);
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return;
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}
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if (hpfs_sb(s)->sb_chk) {
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if (de->down) {
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hpfs_error(s, "set_last_pointer: dnode %08x has already last pointer %08x",
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d->self, de_down_pointer(de));
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return;
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}
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if (de->length != 32) {
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hpfs_error(s, "set_last_pointer: bad last dirent in dnode %08x", d->self);
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return;
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}
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}
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if (ptr) {
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if ((d->first_free += 4) > 2048) {
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hpfs_error(s,"set_last_pointer: too long dnode %08x", d->self);
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d->first_free -= 4;
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return;
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}
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de->length = 36;
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de->down = 1;
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*(dnode_secno *)((char *)de + 32) = ptr;
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}
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}
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/* Add an entry to dnode and don't care if it grows over 2048 bytes */
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struct hpfs_dirent *hpfs_add_de(struct super_block *s, struct dnode *d,
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const unsigned char *name,
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unsigned namelen, secno down_ptr)
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{
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struct hpfs_dirent *de;
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struct hpfs_dirent *de_end = dnode_end_de(d);
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unsigned d_size = de_size(namelen, down_ptr);
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for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
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int c = hpfs_compare_names(s, name, namelen, de->name, de->namelen, de->last);
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if (!c) {
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hpfs_error(s, "name (%c,%d) already exists in dnode %08x", *name, namelen, d->self);
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return NULL;
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}
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if (c < 0) break;
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}
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memmove((char *)de + d_size, de, (char *)de_end - (char *)de);
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memset(de, 0, d_size);
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if (down_ptr) {
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*(int *)((char *)de + d_size - 4) = down_ptr;
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de->down = 1;
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}
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de->length = d_size;
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if (down_ptr) de->down = 1;
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de->not_8x3 = hpfs_is_name_long(name, namelen);
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de->namelen = namelen;
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memcpy(de->name, name, namelen);
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d->first_free += d_size;
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return de;
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}
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/* Delete dirent and don't care about its subtree */
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static void hpfs_delete_de(struct super_block *s, struct dnode *d,
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struct hpfs_dirent *de)
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{
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if (de->last) {
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hpfs_error(s, "attempt to delete last dirent in dnode %08x", d->self);
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return;
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}
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d->first_free -= de->length;
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memmove(de, de_next_de(de), d->first_free + (char *)d - (char *)de);
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}
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static void fix_up_ptrs(struct super_block *s, struct dnode *d)
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{
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struct hpfs_dirent *de;
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struct hpfs_dirent *de_end = dnode_end_de(d);
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dnode_secno dno = d->self;
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for (de = dnode_first_de(d); de < de_end; de = de_next_de(de))
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if (de->down) {
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struct quad_buffer_head qbh;
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struct dnode *dd;
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if ((dd = hpfs_map_dnode(s, de_down_pointer(de), &qbh))) {
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if (dd->up != dno || dd->root_dnode) {
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dd->up = dno;
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dd->root_dnode = 0;
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hpfs_mark_4buffers_dirty(&qbh);
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}
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hpfs_brelse4(&qbh);
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}
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}
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}
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/* Add an entry to dnode and do dnode splitting if required */
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static int hpfs_add_to_dnode(struct inode *i, dnode_secno dno,
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const unsigned char *name, unsigned namelen,
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struct hpfs_dirent *new_de, dnode_secno down_ptr)
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{
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struct quad_buffer_head qbh, qbh1, qbh2;
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struct dnode *d, *ad, *rd, *nd = NULL;
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dnode_secno adno, rdno;
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struct hpfs_dirent *de;
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struct hpfs_dirent nde;
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unsigned char *nname;
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int h;
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int pos;
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struct buffer_head *bh;
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struct fnode *fnode;
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int c1, c2 = 0;
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if (!(nname = kmalloc(256, GFP_NOFS))) {
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printk("HPFS: out of memory, can't add to dnode\n");
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return 1;
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}
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go_up:
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if (namelen >= 256) {
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hpfs_error(i->i_sb, "hpfs_add_to_dnode: namelen == %d", namelen);
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kfree(nd);
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kfree(nname);
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return 1;
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}
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if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) {
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kfree(nd);
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kfree(nname);
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return 1;
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}
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go_up_a:
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if (hpfs_sb(i->i_sb)->sb_chk)
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if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_to_dnode")) {
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hpfs_brelse4(&qbh);
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kfree(nd);
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kfree(nname);
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return 1;
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}
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if (d->first_free + de_size(namelen, down_ptr) <= 2048) {
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loff_t t;
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copy_de(de=hpfs_add_de(i->i_sb, d, name, namelen, down_ptr), new_de);
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t = get_pos(d, de);
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for_all_poss(i, hpfs_pos_ins, t, 1);
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for_all_poss(i, hpfs_pos_subst, 4, t);
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for_all_poss(i, hpfs_pos_subst, 5, t + 1);
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hpfs_mark_4buffers_dirty(&qbh);
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hpfs_brelse4(&qbh);
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kfree(nd);
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kfree(nname);
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return 0;
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}
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if (!nd) if (!(nd = kmalloc(0x924, GFP_NOFS))) {
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/* 0x924 is a max size of dnode after adding a dirent with
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max name length. We alloc this only once. There must
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not be any error while splitting dnodes, otherwise the
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whole directory, not only file we're adding, would
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be lost. */
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printk("HPFS: out of memory for dnode splitting\n");
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hpfs_brelse4(&qbh);
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kfree(nname);
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return 1;
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}
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memcpy(nd, d, d->first_free);
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copy_de(de = hpfs_add_de(i->i_sb, nd, name, namelen, down_ptr), new_de);
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for_all_poss(i, hpfs_pos_ins, get_pos(nd, de), 1);
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h = ((char *)dnode_last_de(nd) - (char *)nd) / 2 + 10;
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if (!(ad = hpfs_alloc_dnode(i->i_sb, d->up, &adno, &qbh1, 0))) {
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hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted");
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hpfs_brelse4(&qbh);
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kfree(nd);
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kfree(nname);
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return 1;
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}
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i->i_size += 2048;
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i->i_blocks += 4;
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pos = 1;
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for (de = dnode_first_de(nd); (char *)de_next_de(de) - (char *)nd < h; de = de_next_de(de)) {
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copy_de(hpfs_add_de(i->i_sb, ad, de->name, de->namelen, de->down ? de_down_pointer(de) : 0), de);
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for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, ((loff_t)adno << 4) | pos);
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pos++;
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}
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copy_de(new_de = &nde, de);
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memcpy(nname, de->name, de->namelen);
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name = nname;
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namelen = de->namelen;
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for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, 4);
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down_ptr = adno;
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set_last_pointer(i->i_sb, ad, de->down ? de_down_pointer(de) : 0);
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de = de_next_de(de);
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memmove((char *)nd + 20, de, nd->first_free + (char *)nd - (char *)de);
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nd->first_free -= (char *)de - (char *)nd - 20;
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memcpy(d, nd, nd->first_free);
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for_all_poss(i, hpfs_pos_del, (loff_t)dno << 4, pos);
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fix_up_ptrs(i->i_sb, ad);
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if (!d->root_dnode) {
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dno = ad->up = d->up;
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hpfs_mark_4buffers_dirty(&qbh);
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hpfs_brelse4(&qbh);
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hpfs_mark_4buffers_dirty(&qbh1);
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hpfs_brelse4(&qbh1);
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goto go_up;
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}
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if (!(rd = hpfs_alloc_dnode(i->i_sb, d->up, &rdno, &qbh2, 0))) {
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hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted");
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hpfs_brelse4(&qbh);
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hpfs_brelse4(&qbh1);
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kfree(nd);
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kfree(nname);
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return 1;
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}
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i->i_size += 2048;
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i->i_blocks += 4;
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rd->root_dnode = 1;
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rd->up = d->up;
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if (!(fnode = hpfs_map_fnode(i->i_sb, d->up, &bh))) {
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hpfs_free_dnode(i->i_sb, rdno);
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hpfs_brelse4(&qbh);
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hpfs_brelse4(&qbh1);
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hpfs_brelse4(&qbh2);
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kfree(nd);
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kfree(nname);
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return 1;
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}
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fnode->u.external[0].disk_secno = rdno;
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mark_buffer_dirty(bh);
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brelse(bh);
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d->up = ad->up = hpfs_i(i)->i_dno = rdno;
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d->root_dnode = ad->root_dnode = 0;
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hpfs_mark_4buffers_dirty(&qbh);
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hpfs_brelse4(&qbh);
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hpfs_mark_4buffers_dirty(&qbh1);
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hpfs_brelse4(&qbh1);
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qbh = qbh2;
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set_last_pointer(i->i_sb, rd, dno);
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dno = rdno;
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d = rd;
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goto go_up_a;
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}
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/*
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* Add an entry to directory btree.
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* I hate such crazy directory structure.
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* It's easy to read but terrible to write.
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* I wrote this directory code 4 times.
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* I hope, now it's finally bug-free.
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*/
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int hpfs_add_dirent(struct inode *i,
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const unsigned char *name, unsigned namelen,
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struct hpfs_dirent *new_de, int cdepth)
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{
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struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
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struct dnode *d;
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struct hpfs_dirent *de, *de_end;
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struct quad_buffer_head qbh;
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dnode_secno dno;
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int c;
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int c1, c2 = 0;
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dno = hpfs_inode->i_dno;
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down:
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if (hpfs_sb(i->i_sb)->sb_chk)
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if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_dirent")) return 1;
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if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 1;
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de_end = dnode_end_de(d);
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for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
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if (!(c = hpfs_compare_names(i->i_sb, name, namelen, de->name, de->namelen, de->last))) {
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hpfs_brelse4(&qbh);
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return -1;
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}
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if (c < 0) {
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if (de->down) {
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dno = de_down_pointer(de);
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hpfs_brelse4(&qbh);
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goto down;
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}
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break;
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}
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}
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hpfs_brelse4(&qbh);
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if (!cdepth) hpfs_lock_creation(i->i_sb);
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if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_ADD)) {
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c = 1;
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goto ret;
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}
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i->i_version++;
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c = hpfs_add_to_dnode(i, dno, name, namelen, new_de, 0);
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ret:
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if (!cdepth) hpfs_unlock_creation(i->i_sb);
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return c;
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}
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/*
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* Find dirent with higher name in 'from' subtree and move it to 'to' dnode.
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* Return the dnode we moved from (to be checked later if it's empty)
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*/
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static secno move_to_top(struct inode *i, dnode_secno from, dnode_secno to)
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{
|
|
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 %08lx",
|
|
dno, up, (unsigned long)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 = %08llx",
|
|
(unsigned long long)*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,
|
|
const unsigned 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)
|
|
{
|
|
unsigned char *name1;
|
|
unsigned 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;
|
|
}
|