fs/hpfs/ea.c - linux - Git at Google

 // 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);
 }
	// 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);
	}