ext3-ea-in-inode-2.6-suse.patch

非常经典的一个分布式系统

%patch
Index: linux-2.6.0/fs/ext3/ialloc.c
===================================================================
--- linux-2.6.0.orig/fs/ext3/ialloc.c	2004-01-14 18:54:11.000000000 +0300
+++ linux-2.6.0/fs/ext3/ialloc.c	2004-01-14 18:54:12.000000000 +0300
@@ -627,6 +627,9 @@
 	inode->i_generation = EXT3_SB(sb)->s_next_generation++;
 
 	ei->i_state = EXT3_STATE_NEW;
+	ei->i_extra_isize =
+		(EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) ?
+		sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE : 0;
 
 	ret = inode;
 	if(DQUOT_ALLOC_INODE(inode)) {
Index: linux-2.6.0/fs/ext3/inode.c
===================================================================
--- linux-2.6.0.orig/fs/ext3/inode.c	2004-01-14 18:54:12.000000000 +0300
+++ linux-2.6.0/fs/ext3/inode.c	2004-01-14 19:09:46.000000000 +0300
@@ -2339,7 +2339,7 @@
  * trying to determine the inode's location on-disk and no read need be
  * performed.
  */
-static int ext3_get_inode_loc(struct inode *inode,
+int ext3_get_inode_loc(struct inode *inode,
 				struct ext3_iloc *iloc, int in_mem)
 {
 	unsigned long block;
@@ -2547,6 +2547,11 @@
 		ei->i_data[block] = raw_inode->i_block[block];
 	INIT_LIST_HEAD(&ei->i_orphan);
 
+	if (EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE)
+		ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize);
+	else
+		ei->i_extra_isize = 0;
+
 	if (S_ISREG(inode->i_mode)) {
 		inode->i_op = &ext3_file_inode_operations;
 		inode->i_fop = &ext3_file_operations;
@@ -2682,6 +2687,9 @@
 	} else for (block = 0; block < EXT3_N_BLOCKS; block++)
 		raw_inode->i_block[block] = ei->i_data[block];
 
+	if (EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE)
+		raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize);
+
 	BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
 	rc = ext3_journal_dirty_metadata(handle, bh);
 	if (!err)
@@ -2849,7 +2857,8 @@ ext3_reserve_inode_write(handle_t *handl
 {
 	int err = 0;
 	if (handle) {
-		err = ext3_get_inode_loc(inode, iloc, 1);
+		err = ext3_get_inode_loc(inode, iloc, EXT3_I(inode)->i_state &
+							EXT3_STATE_NEW);
 		if (!err) {
 			BUFFER_TRACE(iloc->bh, "get_write_access");
 			err = ext3_journal_get_write_access(handle, iloc->bh);
Index: linux-2.6.0/fs/ext3/xattr.c
===================================================================
--- linux-2.6.0.orig/fs/ext3/xattr.c	2003-12-30 08:33:13.000000000 +0300
+++ linux-2.6.0/fs/ext3/xattr.c	2004-01-14 18:54:12.000000000 +0300
@@ -246,17 +246,12 @@
 }
 
 /*
- * ext3_xattr_get()
- *
- * Copy an extended attribute into the buffer
- * provided, or compute the buffer size required.
- * Buffer is NULL to compute the size of the buffer required.
+ * ext3_xattr_block_get()
  *
- * Returns a negative error number on failure, or the number of bytes
- * used / required on success.
+ * routine looks for attribute in EA block and returns it's value and size
  */
 int
-ext3_xattr_get(struct inode *inode, int name_index, const char *name,
+ext3_xattr_block_get(struct inode *inode, int name_index, const char *name,
 	       void *buffer, size_t buffer_size)
 {
 	struct buffer_head *bh = NULL;
@@ -270,7 +265,6 @@
 
 	if (name == NULL)
 		return -EINVAL;
-	down_read(&EXT3_I(inode)->xattr_sem);
 	error = -ENODATA;
 	if (!EXT3_I(inode)->i_file_acl)
 		goto cleanup;
@@ -343,15 +337,87 @@
 
 cleanup:
 	brelse(bh);
-	up_read(&EXT3_I(inode)->xattr_sem);
 
 	return error;
 }
 
 /*
- * ext3_xattr_list()
+ * ext3_xattr_ibody_get()
  *
- * Copy a list of attribute names into the buffer
+ * routine looks for attribute in inode body and returns it's value and size
+ */
+int
+ext3_xattr_ibody_get(struct inode *inode, int name_index, const char *name,
+	       void *buffer, size_t buffer_size)
+{
+	int size, name_len = strlen(name), storage_size;
+	struct ext3_xattr_entry *last;
+	struct ext3_inode *raw_inode;
+	struct ext3_iloc iloc;
+	char *start, *end;
+	int ret = -ENOENT;
+	
+	if (EXT3_SB(inode->i_sb)->s_inode_size <= EXT3_GOOD_OLD_INODE_SIZE)
+		return -ENOENT;
+
+	ret = ext3_get_inode_loc(inode, &iloc, 0);
+	if (ret)
+		return ret;
+	raw_inode = ext3_raw_inode(&iloc);
+
+	storage_size = EXT3_SB(inode->i_sb)->s_inode_size -
+				EXT3_GOOD_OLD_INODE_SIZE -
+				EXT3_I(inode)->i_extra_isize -
+				sizeof(__u32);
+	start = (char *) raw_inode + EXT3_GOOD_OLD_INODE_SIZE +
+			EXT3_I(inode)->i_extra_isize;
+	if (le32_to_cpu((*(__u32*) start)) != EXT3_XATTR_MAGIC) {
+		brelse(iloc.bh);
+		return -ENOENT;
+	}
+	start += sizeof(__u32);
+	end = (char *) raw_inode + EXT3_SB(inode->i_sb)->s_inode_size;
+
+	last = (struct ext3_xattr_entry *) start;
+	while (!IS_LAST_ENTRY(last)) {
+		struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(last);
+		if (le32_to_cpu(last->e_value_size) > storage_size ||
+				(char *) next >= end) {
+			ext3_error(inode->i_sb, "ext3_xattr_ibody_get",
+				"inode %ld", inode->i_ino);
+			brelse(iloc.bh);
+			return -EIO;
+		}
+		if (name_index == last->e_name_index &&
+		    name_len == last->e_name_len &&
+		    !memcmp(name, last->e_name, name_len))
+			goto found;
+		last = next;
+	}
+
+	/* can't find EA */
+	brelse(iloc.bh);
+	return -ENOENT;
+	
+found:
+	size = le32_to_cpu(last->e_value_size);
+	if (buffer) {
+		ret = -ERANGE;
+		if (buffer_size >= size) {
+			memcpy(buffer, start + le16_to_cpu(last->e_value_offs),
+				size);
+			ret = size;
+		}
+	} else
+		ret = size;
+	brelse(iloc.bh);
+	return ret;
+}
+
+/*
+ * ext3_xattr_get()
+ *
+ * Copy an extended attribute into the buffer
  * provided, or compute the buffer size required.
  * Buffer is NULL to compute the size of the buffer required.
  *
@@ -359,7 +425,31 @@
  * used / required on success.
  */
 int
-ext3_xattr_list(struct inode *inode, char *buffer, size_t buffer_size)
+ext3_xattr_get(struct inode *inode, int name_index, const char *name,
+	       void *buffer, size_t buffer_size)
+{
+	int err;
+
+	down_read(&EXT3_I(inode)->xattr_sem);
+
+	/* try to find attribute in inode body */
+	err = ext3_xattr_ibody_get(inode, name_index, name,
+					buffer, buffer_size);
+	if (err < 0)
+		/* search was unsuccessful, try to find EA in dedicated block */
+		err = ext3_xattr_block_get(inode, name_index, name,
+				buffer, buffer_size);
+	up_read(&EXT3_I(inode)->xattr_sem);
+
+	return err;
+}
+
+/* ext3_xattr_ibody_list()
+ *
+ * generate list of attributes stored in EA block
+ */
+int
+ext3_xattr_block_list(struct inode *inode, char *buffer, size_t buffer_size)
 {
 	struct buffer_head *bh = NULL;
 	struct ext3_xattr_entry *entry;
@@ -370,7 +460,6 @@
 	ea_idebug(inode, "buffer=%p, buffer_size=%ld",
 		  buffer, (long)buffer_size);
 
-	down_read(&EXT3_I(inode)->xattr_sem);
 	error = 0;
 	if (!EXT3_I(inode)->i_file_acl)
 		goto cleanup;
@@ -431,11 +520,138 @@
 
 cleanup:
 	brelse(bh);
-	up_read(&EXT3_I(inode)->xattr_sem);
 
 	return error;
 }
 
+/* ext3_xattr_ibody_list()
+ *
+ * generate list of attributes stored in inode body
+ */
+int
+ext3_xattr_ibody_list(struct inode *inode, char *buffer, size_t buffer_size)
+{
+	struct ext3_xattr_entry *last;
+	struct ext3_inode *raw_inode;
+	char *start, *end, *buf;
+	struct ext3_iloc iloc;
+	int storage_size;
+	int ret;
+	int size = 0;
+	
+	if (EXT3_SB(inode->i_sb)->s_inode_size <= EXT3_GOOD_OLD_INODE_SIZE)
+		return 0;
+
+	ret = ext3_get_inode_loc(inode, &iloc, 0);
+	if (ret)
+		return ret;
+	raw_inode = ext3_raw_inode(&iloc);
+
+	storage_size = EXT3_SB(inode->i_sb)->s_inode_size -
+				EXT3_GOOD_OLD_INODE_SIZE -
+				EXT3_I(inode)->i_extra_isize -
+				sizeof(__u32);
+	start = (char *) raw_inode + EXT3_GOOD_OLD_INODE_SIZE +
+			EXT3_I(inode)->i_extra_isize;
+	if (le32_to_cpu((*(__u32*) start)) != EXT3_XATTR_MAGIC) {
+		brelse(iloc.bh);
+		return 0;
+	}
+	start += sizeof(__u32);
+	end = (char *) raw_inode + EXT3_SB(inode->i_sb)->s_inode_size;
+
+	last = (struct ext3_xattr_entry *) start;
+	while (!IS_LAST_ENTRY(last)) {
+		struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(last);
+		struct ext3_xattr_handler *handler;
+		if (le32_to_cpu(last->e_value_size) > storage_size ||
+				(char *) next >= end) {
+			ext3_error(inode->i_sb, "ext3_xattr_ibody_list",
+				"inode %ld", inode->i_ino);
+			brelse(iloc.bh);
+			return -EIO;
+		}
+		handler = ext3_xattr_handler(last->e_name_index);
+		if (handler)
+			size += handler->list(NULL, inode, last->e_name,
+					      last->e_name_len);
+		last = next;
+	}
+
+	if (!buffer) {
+		ret = size;
+		goto cleanup;
+	} else {
+		ret = -ERANGE;
+		if (size > buffer_size)
+			goto cleanup;
+	}
+
+	last = (struct ext3_xattr_entry *) start;
+	buf = buffer;
+	while (!IS_LAST_ENTRY(last)) {
+		struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(last);
+		struct ext3_xattr_handler *handler;
+		handler = ext3_xattr_handler(last->e_name_index);
+		if (handler)
+			buf += handler->list(buf, inode, last->e_name,
+					      last->e_name_len);
+		last = next;
+	}
+	ret = size;
+cleanup:
+	brelse(iloc.bh);
+	return ret;
+}
+
+/*
+ * ext3_xattr_list()
+ *
+ * Copy a list of attribute names into the buffer
+ * provided, or compute the buffer size required.
+ * Buffer is NULL to compute the size of the buffer required.
+ *
+ * Returns a negative error number on failure, or the number of bytes
+ * used / required on success.
+ */
+int
+ext3_xattr_list(struct inode *inode, char *buffer, size_t buffer_size)
+{
+	int error;
+	int size = buffer_size;
+
+	down_read(&EXT3_I(inode)->xattr_sem);
+
+	/* get list of attributes stored in inode body */
+	error = ext3_xattr_ibody_list(inode, buffer, buffer_size);
+	if (error < 0) {
+		/* some error occured while collecting
+		 * attributes in inode body */
+		size = 0;
+		goto cleanup;
+	}
+	size = error;
+
+	/* get list of attributes stored in dedicated block */
+	if (buffer) {
+		buffer_size -= error;
+		if (buffer_size <= 0) {
+			buffer = NULL;
+			buffer_size = 0;
+		} else
+			buffer += error;
+	}
+
+	error = ext3_xattr_block_list(inode, buffer, buffer_size);
+	if (error < 0)
+		/* listing was successful, so we return len */
+		size = 0;
+
+cleanup:
+	up_read(&EXT3_I(inode)->xattr_sem);
+	return error + size;
+}
+
 /*
  * If the EXT3_FEATURE_COMPAT_EXT_ATTR feature of this file system is
  * not set, set it.
@@ -457,6 +673,279 @@
 }
 
 /*
+ * ext3_xattr_ibody_find()
+ *
+ * search attribute and calculate free space in inode body
+ * NOTE: free space includes space our attribute hold
+ */
+int
+ext3_xattr_ibody_find(struct inode *inode, int name_index,
+		const char *name, struct ext3_xattr_entry *rentry, int *free)
+{
+	struct ext3_xattr_entry *last;
+	struct ext3_inode *raw_inode;
+	int name_len = strlen(name);
+	int err, storage_size;
+	struct ext3_iloc iloc;
+	char *start, *end;
+	int ret = -ENOENT;
+	
+	if (EXT3_SB(inode->i_sb)->s_inode_size <= EXT3_GOOD_OLD_INODE_SIZE)
+		return ret;
+
+	err = ext3_get_inode_loc(inode, &iloc, 0);
+	if (err)
+		return -EIO;
+	raw_inode = ext3_raw_inode(&iloc);
+
+	storage_size = EXT3_SB(inode->i_sb)->s_inode_size -
+				EXT3_GOOD_OLD_INODE_SIZE -
+				EXT3_I(inode)->i_extra_isize -
+				sizeof(__u32);
+	*free = storage_size - sizeof(__u32);
+	start = (char *) raw_inode + EXT3_GOOD_OLD_INODE_SIZE +
+			EXT3_I(inode)->i_extra_isize;
+	if (le32_to_cpu((*(__u32*) start)) != EXT3_XATTR_MAGIC) {
+		brelse(iloc.bh);
+		return -ENOENT;
+	}
+	start += sizeof(__u32);
+	end = (char *) raw_inode + EXT3_SB(inode->i_sb)->s_inode_size;
+
+	last = (struct ext3_xattr_entry *) start;
+	while (!IS_LAST_ENTRY(last)) {
+		struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(last);
+		if (le32_to_cpu(last->e_value_size) > storage_size ||
+				(char *) next >= end) {
+			ext3_error(inode->i_sb, "ext3_xattr_ibody_find",
+				"inode %ld", inode->i_ino);
+			brelse(iloc.bh);
+			return -EIO;
+		}
+
+		if (name_index == last->e_name_index &&
+		    name_len == last->e_name_len &&