diff options
Diffstat (limited to 'fs/hpfs/ea.c')
| -rw-r--r-- | fs/hpfs/ea.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/fs/hpfs/ea.c b/fs/hpfs/ea.c new file mode 100644 index 00000000000..66339dc030e --- /dev/null +++ b/fs/hpfs/ea.c @@ -0,0 +1,363 @@ +/* + * 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; +} + |