| /* |
| * 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, |
| 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; |
| 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, 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) { |
| 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 %08lx: ea_offs == %03x, ea_size_s == %03x", |
| (unsigned long)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))) 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))) |
| 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)))) |
| 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; |
| } |
| |
