--- /dev/null
+/*
+ * 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);
+}
+
Code Review / kvmfornfv.git / blobdiff