diff options
Diffstat (limited to 'fs/hpfs/ea.c')
| -rw-r--r-- | fs/hpfs/ea.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/fs/hpfs/ea.c b/fs/hpfs/ea.c new file mode 100644 index 000000000..102ba18e5 --- /dev/null +++ b/fs/hpfs/ea.c @@ -0,0 +1,368 @@ +// 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, &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); +} + |