| // SPDX-License-Identifier: GPL-2.0 | |
| /* | |
| * 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(ea)) { | |
| if (ea_valuelen(ea) != 8) { | |
| hpfs_error(s, "ea_indirect(ea) 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_in_anode(ea), ea_len(ea)); | |
| } | |
| pos += ea->namelen + ea_valuelen(ea) + 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, GET_BTREE_PTR(&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))) { | |
| pr_err("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, | |
| const 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; | |
| char ex[4 + 255 + 1 + 8]; | |
| 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(ea)) | |
| goto indirect; | |
| if (ea_valuelen(ea) >= size) | |
| return -EINVAL; | |
| memcpy(buf, ea_data(ea), ea_valuelen(ea)); | |
| buf[ea_valuelen(ea)] = 0; | |
| return 0; | |
| } | |
| a = le32_to_cpu(fnode->ea_secno); | |
| len = le32_to_cpu(fnode->ea_size_l); | |
| ano = fnode_in_anode(fnode); | |
| pos = 0; | |
| while (pos < len) { | |
| 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(ea) ? 8 : 0), ex + 4)) | |
| return -EIO; | |
| if (!strcmp(ea->name, key)) { | |
| if (ea_indirect(ea)) | |
| goto indirect; | |
| if (ea_valuelen(ea) >= size) | |
| return -EINVAL; | |
| if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), buf)) | |
| return -EIO; | |
| buf[ea_valuelen(ea)] = 0; | |
| return 0; | |
| } | |
| pos += ea->namelen + ea_valuelen(ea) + 5; | |
| } | |
| return -ENOENT; | |
| indirect: | |
| if (ea_len(ea) >= size) | |
| return -EINVAL; | |
| if (hpfs_ea_read(s, ea_sec(ea), ea_in_anode(ea), 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(ea)) | |
| return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea)); | |
| if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { | |
| pr_err("out of memory for EA\n"); | |
| return NULL; | |
| } | |
| memcpy(ret, ea_data(ea), ea_valuelen(ea)); | |
| ret[ea_valuelen(ea)] = 0; | |
| return ret; | |
| } | |
| a = le32_to_cpu(fnode->ea_secno); | |
| len = le32_to_cpu(fnode->ea_size_l); | |
| ano = fnode_in_anode(fnode); | |
| 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(ea) ? 8 : 0), ex + 4)) | |
| return NULL; | |
| if (!strcmp(ea->name, key)) { | |
| if (ea_indirect(ea)) | |
| return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea)); | |
| if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { | |
| pr_err("out of memory for EA\n"); | |
| return NULL; | |
| } | |
| if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), ret)) { | |
| kfree(ret); | |
| return NULL; | |
| } | |
| ret[ea_valuelen(ea)] = 0; | |
| return ret; | |
| } | |
| pos += ea->namelen + ea_valuelen(ea) + 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, const char *key, | |
| const 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(ea)) { | |
| if (ea_len(ea) == size) | |
| set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size); | |
| } else if (ea_valuelen(ea) == size) { | |
| memcpy(ea_data(ea), data, size); | |
| } | |
| return; | |
| } | |
| a = le32_to_cpu(fnode->ea_secno); | |
| len = le32_to_cpu(fnode->ea_size_l); | |
| ano = fnode_in_anode(fnode); | |
| 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(ea) ? 8 : 0), ex + 4)) | |
| return; | |
| if (!strcmp(ea->name, key)) { | |
| if (ea_indirect(ea)) { | |
| if (ea_len(ea) == size) | |
| set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size); | |
| } | |
| else { | |
| if (ea_valuelen(ea) == size) | |
| hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data); | |
| } | |
| return; | |
| } | |
| pos += ea->namelen + ea_valuelen(ea) + 5; | |
| } | |
| if (!le16_to_cpu(fnode->ea_offs)) { | |
| /*if (le16_to_cpu(fnode->ea_size_s)) { | |
| hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0", | |
| inode->i_ino, le16_to_cpu(fnode->ea_size_s)); | |
| return; | |
| }*/ | |
| fnode->ea_offs = cpu_to_le16(0xc4); | |
| } | |
| if (le16_to_cpu(fnode->ea_offs) < 0xc4 || le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200) { | |
| hpfs_error(s, "fnode %08lx: ea_offs == %03x, ea_size_s == %03x", | |
| (unsigned long)inode->i_ino, | |
| le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s)); | |
| return; | |
| } | |
| if ((le16_to_cpu(fnode->ea_size_s) || !le32_to_cpu(fnode->ea_size_l)) && | |
| le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5 <= 0x200) { | |
| ea = fnode_end_ea(fnode); | |
| *(char *)ea = 0; | |
| ea->namelen = strlen(key); | |
| ea->valuelen_lo = size; | |
| ea->valuelen_hi = size >> 8; | |
| strcpy(ea->name, key); | |
| memcpy(ea_data(ea), data, size); | |
| fnode->ea_size_s = cpu_to_le16(le16_to_cpu(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 (le16_to_cpu(fnode->ea_size_s) && !le32_to_cpu(fnode->ea_size_l)) { | |
| secno n; | |
| struct buffer_head *bh; | |
| char *data; | |
| if (!(n = hpfs_alloc_sector(s, fno, 1, 0))) return; | |
| if (!(data = hpfs_get_sector(s, n, &bh))) { | |
| hpfs_free_sectors(s, n, 1); | |
| return; | |
| } | |
| memcpy(data, fnode_ea(fnode), le16_to_cpu(fnode->ea_size_s)); | |
| fnode->ea_size_l = cpu_to_le32(le16_to_cpu(fnode->ea_size_s)); | |
| fnode->ea_size_s = cpu_to_le16(0); | |
| fnode->ea_secno = cpu_to_le32(n); | |
| fnode->flags &= ~FNODE_anode; | |
| mark_buffer_dirty(bh); | |
| brelse(bh); | |
| } | |
| pos = le32_to_cpu(fnode->ea_size_l) + 5 + strlen(key) + size; | |
| len = (le32_to_cpu(fnode->ea_size_l) + 511) >> 9; | |
| if (pos >= 30000) goto bail; | |
| while (((pos + 511) >> 9) > len) { | |
| if (!len) { | |
| secno q = hpfs_alloc_sector(s, fno, 1, 0); | |
| if (!q) goto bail; | |
| fnode->ea_secno = cpu_to_le32(q); | |
| fnode->flags &= ~FNODE_anode; | |
| len++; | |
| } else if (!fnode_in_anode(fnode)) { | |
| if (hpfs_alloc_if_possible(s, le32_to_cpu(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 = cpu_to_le32(fno); | |
| anode->btree.fnode_parent = 1; | |
| anode->btree.n_free_nodes--; | |
| anode->btree.n_used_nodes++; | |
| anode->btree.first_free = cpu_to_le16(le16_to_cpu(anode->btree.first_free) + 12); | |
| anode->u.external[0].disk_secno = cpu_to_le32(le32_to_cpu(fnode->ea_secno)); | |
| anode->u.external[0].file_secno = cpu_to_le32(0); | |
| anode->u.external[0].length = cpu_to_le32(len); | |
| mark_buffer_dirty(bh); | |
| brelse(bh); | |
| fnode->flags |= FNODE_anode; | |
| fnode->ea_secno = cpu_to_le32(a_s);*/ | |
| secno new_sec; | |
| int i; | |
| if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9)))) | |
| goto bail; | |
| for (i = 0; i < len; i++) { | |
| struct buffer_head *bh1, *bh2; | |
| void *b1, *b2; | |
| if (!(b1 = hpfs_map_sector(s, le32_to_cpu(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, le32_to_cpu(fnode->ea_secno), len); | |
| fnode->ea_secno = cpu_to_le32(new_sec); | |
| len = (pos + 511) >> 9; | |
| } | |
| } | |
| if (fnode_in_anode(fnode)) { | |
| if (hpfs_add_sector_to_btree(s, le32_to_cpu(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, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l), 4, h)) goto bail; | |
| if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 4, h[1] + 1, key)) goto bail; | |
| if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 5 + h[1], size, data)) goto bail; | |
| fnode->ea_size_l = cpu_to_le32(pos); | |
| ret: | |
| hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size; | |
| return; | |
| bail: | |
| if (le32_to_cpu(fnode->ea_secno)) | |
| if (fnode_in_anode(fnode)) hpfs_truncate_btree(s, le32_to_cpu(fnode->ea_secno), 1, (le32_to_cpu(fnode->ea_size_l) + 511) >> 9); | |
| else hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno) + ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9), len - ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9)); | |
| else fnode->ea_secno = fnode->ea_size_l = cpu_to_le32(0); | |
| } | |