| /* | |
| * linux/fs/hpfs/ea.c | |
| * | |
| * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 | |
| * | |
| * handling extended attributes | |
| */ | |
| #include "hpfs_fn.h" | |
| /* Remove external extended attributes. ano specifies whether a is a | |
| direct sector where eas starts or an anode */ | |
| void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len) | |
| { | |
| unsigned pos = 0; | |
| while (pos < len) { | |
| char ex[4 + 255 + 1 + 8]; | |
| struct extended_attribute *ea = (struct extended_attribute *)ex; | |
| if (pos + 4 > len) { | |
| hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", | |
| ano ? "anode" : "sectors", a, len); | |
| return; | |
| } | |
| if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; | |
| if (ea->indirect) { | |
| if (ea->valuelen != 8) { | |
| hpfs_error(s, "ea->indirect set while ea->valuelen!=8, %s %08x, pos %08x", | |
| ano ? "anode" : "sectors", a, pos); | |
| return; | |
| } | |
| if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 9, ex+4)) | |
| return; | |
| hpfs_ea_remove(s, ea_sec(ea), ea->anode, ea_len(ea)); | |
| } | |
| pos += ea->namelen + ea->valuelen + 5; | |
| } | |
| if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9); | |
| else { | |
| struct buffer_head *bh; | |
| struct anode *anode; | |
| if ((anode = hpfs_map_anode(s, a, &bh))) { | |
| hpfs_remove_btree(s, &anode->btree); | |
| brelse(bh); | |
| hpfs_free_sectors(s, a, 1); | |
| } | |
| } | |
| } | |
| static char *get_indirect_ea(struct super_block *s, int ano, secno a, int size) | |
| { | |
| char *ret; | |
| if (!(ret = kmalloc(size + 1, GFP_NOFS))) { | |
| printk("HPFS: out of memory for EA\n"); | |
| return NULL; | |
| } | |
| if (hpfs_ea_read(s, a, ano, 0, size, ret)) { | |
| kfree(ret); | |
| return NULL; | |
| } | |
| ret[size] = 0; | |
| return ret; | |
| } | |
| static void set_indirect_ea(struct super_block *s, int ano, secno a, char *data, | |
| int size) | |
| { | |
| hpfs_ea_write(s, a, ano, 0, size, data); | |
| } | |
| /* Read an extended attribute named 'key' into the provided buffer */ | |
| int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key, | |
| char *buf, int size) | |
| { | |
| unsigned pos; | |
| int ano, len; | |
| secno a; | |
| struct extended_attribute *ea; | |
| struct extended_attribute *ea_end = fnode_end_ea(fnode); | |
| for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) | |
| if (!strcmp(ea->name, key)) { | |
| if (ea->indirect) | |
| goto indirect; | |
| if (ea->valuelen >= size) | |
| return -EINVAL; | |
| memcpy(buf, ea_data(ea), ea->valuelen); | |
| buf[ea->valuelen] = 0; | |
| return 0; | |
| } | |
| a = fnode->ea_secno; | |
| len = fnode->ea_size_l; | |
| ano = fnode->ea_anode; | |
| pos = 0; | |
| while (pos < len) { | |
| char ex[4 + 255 + 1 + 8]; | |
| ea = (struct extended_attribute *)ex; | |
| if (pos + 4 > len) { | |
| hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", | |
| ano ? "anode" : "sectors", a, len); | |
| return -EIO; | |
| } | |
| if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return -EIO; | |
| if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4)) | |
| return -EIO; | |
| if (!strcmp(ea->name, key)) { | |
| if (ea->indirect) | |
| goto indirect; | |
| if (ea->valuelen >= size) | |
| return -EINVAL; | |
| if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea->valuelen, buf)) | |
| return -EIO; | |
| buf[ea->valuelen] = 0; | |
| return 0; | |
| } | |
| pos += ea->namelen + ea->valuelen + 5; | |
| } | |
| return -ENOENT; | |
| indirect: | |
| if (ea_len(ea) >= size) | |
| return -EINVAL; | |
| if (hpfs_ea_read(s, ea_sec(ea), ea->anode, 0, ea_len(ea), buf)) | |
| return -EIO; | |
| buf[ea_len(ea)] = 0; | |
| return 0; | |
| } | |
| /* Read an extended attribute named 'key' */ | |
| char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *size) | |
| { | |
| char *ret; | |
| unsigned pos; | |
| int ano, len; | |
| secno a; | |
| struct extended_attribute *ea; | |
| struct extended_attribute *ea_end = fnode_end_ea(fnode); | |
| for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) | |
| if (!strcmp(ea->name, key)) { | |
| if (ea->indirect) | |
| return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea)); | |
| if (!(ret = kmalloc((*size = ea->valuelen) + 1, GFP_NOFS))) { | |
| printk("HPFS: out of memory for EA\n"); | |
| return NULL; | |
| } | |
| memcpy(ret, ea_data(ea), ea->valuelen); | |
| ret[ea->valuelen] = 0; | |
| return ret; | |
| } | |
| a = fnode->ea_secno; | |
| len = fnode->ea_size_l; | |
| ano = fnode->ea_anode; | |
| pos = 0; | |
| while (pos < len) { | |
| char ex[4 + 255 + 1 + 8]; | |
| ea = (struct extended_attribute *)ex; | |
| if (pos + 4 > len) { | |
| hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", | |
| ano ? "anode" : "sectors", a, len); | |
| return NULL; | |
| } | |
| if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL; | |
| if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4)) | |
| return NULL; | |
| if (!strcmp(ea->name, key)) { | |
| if (ea->indirect) | |
| return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea)); | |
| if (!(ret = kmalloc((*size = ea->valuelen) + 1, GFP_NOFS))) { | |
| printk("HPFS: out of memory for EA\n"); | |
| return NULL; | |
| } | |
| if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea->valuelen, ret)) { | |
| kfree(ret); | |
| return NULL; | |
| } | |
| ret[ea->valuelen] = 0; | |
| return ret; | |
| } | |
| pos += ea->namelen + ea->valuelen + 5; | |
| } | |
| return NULL; | |
| } | |
| /* | |
| * Update or create extended attribute 'key' with value 'data'. Note that | |
| * when this ea exists, it MUST have the same size as size of data. | |
| * This driver can't change sizes of eas ('cause I just don't need it). | |
| */ | |
| void hpfs_set_ea(struct inode *inode, struct fnode *fnode, char *key, char *data, int size) | |
| { | |
| fnode_secno fno = inode->i_ino; | |
| struct super_block *s = inode->i_sb; | |
| unsigned pos; | |
| int ano, len; | |
| secno a; | |
| unsigned char h[4]; | |
| struct extended_attribute *ea; | |
| struct extended_attribute *ea_end = fnode_end_ea(fnode); | |
| for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) | |
| if (!strcmp(ea->name, key)) { | |
| if (ea->indirect) { | |
| if (ea_len(ea) == size) | |
| set_indirect_ea(s, ea->anode, ea_sec(ea), data, size); | |
| } else if (ea->valuelen == size) { | |
| memcpy(ea_data(ea), data, size); | |
| } | |
| return; | |
| } | |
| a = fnode->ea_secno; | |
| len = fnode->ea_size_l; | |
| ano = fnode->ea_anode; | |
| pos = 0; | |
| while (pos < len) { | |
| char ex[4 + 255 + 1 + 8]; | |
| ea = (struct extended_attribute *)ex; | |
| if (pos + 4 > len) { | |
| hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", | |
| ano ? "anode" : "sectors", a, len); | |
| return; | |
| } | |
| if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; | |
| if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4)) | |
| return; | |
| if (!strcmp(ea->name, key)) { | |
| if (ea->indirect) { | |
| if (ea_len(ea) == size) | |
| set_indirect_ea(s, ea->anode, ea_sec(ea), data, size); | |
| } | |
| else { | |
| if (ea->valuelen == size) | |
| hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data); | |
| } | |
| return; | |
| } | |
| pos += ea->namelen + ea->valuelen + 5; | |
| } | |
| if (!fnode->ea_offs) { | |
| /*if (fnode->ea_size_s) { | |
| hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0", | |
| inode->i_ino, fnode->ea_size_s); | |
| return; | |
| }*/ | |
| fnode->ea_offs = 0xc4; | |
| } | |
| if (fnode->ea_offs < 0xc4 || fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s > 0x200) { | |
| hpfs_error(s, "fnode %08x: ea_offs == %03x, ea_size_s == %03x", | |
| inode->i_ino, fnode->ea_offs, fnode->ea_size_s); | |
| return; | |
| } | |
| if ((fnode->ea_size_s || !fnode->ea_size_l) && | |
| fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s + strlen(key) + size + 5 <= 0x200) { | |
| ea = fnode_end_ea(fnode); | |
| *(char *)ea = 0; | |
| ea->namelen = strlen(key); | |
| ea->valuelen = size; | |
| strcpy(ea->name, key); | |
| memcpy(ea_data(ea), data, size); | |
| fnode->ea_size_s += strlen(key) + size + 5; | |
| goto ret; | |
| } | |
| /* Most the code here is 99.9993422% unused. I hope there are no bugs. | |
| But what .. HPFS.IFS has also bugs in ea management. */ | |
| if (fnode->ea_size_s && !fnode->ea_size_l) { | |
| secno n; | |
| struct buffer_head *bh; | |
| char *data; | |
| if (!(n = hpfs_alloc_sector(s, fno, 1, 0, 1))) return; | |
| if (!(data = hpfs_get_sector(s, n, &bh))) { | |
| hpfs_free_sectors(s, n, 1); | |
| return; | |
| } | |
| memcpy(data, fnode_ea(fnode), fnode->ea_size_s); | |
| fnode->ea_size_l = fnode->ea_size_s; | |
| fnode->ea_size_s = 0; | |
| fnode->ea_secno = n; | |
| fnode->ea_anode = 0; | |
| mark_buffer_dirty(bh); | |
| brelse(bh); | |
| } | |
| pos = fnode->ea_size_l + 5 + strlen(key) + size; | |
| len = (fnode->ea_size_l + 511) >> 9; | |
| if (pos >= 30000) goto bail; | |
| while (((pos + 511) >> 9) > len) { | |
| if (!len) { | |
| if (!(fnode->ea_secno = hpfs_alloc_sector(s, fno, 1, 0, 1))) | |
| goto bail; | |
| fnode->ea_anode = 0; | |
| len++; | |
| } else if (!fnode->ea_anode) { | |
| if (hpfs_alloc_if_possible(s, fnode->ea_secno + len)) { | |
| len++; | |
| } else { | |
| /* Aargh... don't know how to create ea anodes :-( */ | |
| /*struct buffer_head *bh; | |
| struct anode *anode; | |
| anode_secno a_s; | |
| if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh))) | |
| goto bail; | |
| anode->up = fno; | |
| anode->btree.fnode_parent = 1; | |
| anode->btree.n_free_nodes--; | |
| anode->btree.n_used_nodes++; | |
| anode->btree.first_free += 12; | |
| anode->u.external[0].disk_secno = fnode->ea_secno; | |
| anode->u.external[0].file_secno = 0; | |
| anode->u.external[0].length = len; | |
| mark_buffer_dirty(bh); | |
| brelse(bh); | |
| fnode->ea_anode = 1; | |
| fnode->ea_secno = a_s;*/ | |
| secno new_sec; | |
| int i; | |
| if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9), 1))) | |
| goto bail; | |
| for (i = 0; i < len; i++) { | |
| struct buffer_head *bh1, *bh2; | |
| void *b1, *b2; | |
| if (!(b1 = hpfs_map_sector(s, fnode->ea_secno + i, &bh1, len - i - 1))) { | |
| hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); | |
| goto bail; | |
| } | |
| if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) { | |
| brelse(bh1); | |
| hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); | |
| goto bail; | |
| } | |
| memcpy(b2, b1, 512); | |
| brelse(bh1); | |
| mark_buffer_dirty(bh2); | |
| brelse(bh2); | |
| } | |
| hpfs_free_sectors(s, fnode->ea_secno, len); | |
| fnode->ea_secno = new_sec; | |
| len = (pos + 511) >> 9; | |
| } | |
| } | |
| if (fnode->ea_anode) { | |
| if (hpfs_add_sector_to_btree(s, fnode->ea_secno, | |
| 0, len) != -1) { | |
| len++; | |
| } else { | |
| goto bail; | |
| } | |
| } | |
| } | |
| h[0] = 0; | |
| h[1] = strlen(key); | |
| h[2] = size & 0xff; | |
| h[3] = size >> 8; | |
| if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l, 4, h)) goto bail; | |
| if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 4, h[1] + 1, key)) goto bail; | |
| if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 5 + h[1], size, data)) goto bail; | |
| fnode->ea_size_l = pos; | |
| ret: | |
| hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size; | |
| return; | |
| bail: | |
| if (fnode->ea_secno) | |
| if (fnode->ea_anode) hpfs_truncate_btree(s, fnode->ea_secno, 1, (fnode->ea_size_l + 511) >> 9); | |
| else hpfs_free_sectors(s, fnode->ea_secno + ((fnode->ea_size_l + 511) >> 9), len - ((fnode->ea_size_l + 511) >> 9)); | |
| else fnode->ea_secno = fnode->ea_size_l = 0; | |
| } | |