0c044f0b24
Ocfs2 breaks up xattr index tree leaves into 4k regions, called buckets. Attributes are stored within a given bucket, depending on hash value. After a discussion with Mark, we decided that the per-bucket index (xe_entry[]) would only exist in the 1st block of a bucket. Likewise, name/value pairs will not straddle more than one block. This allows the majority of operations to work directly on the buffer heads in a leaf block. This patch adds code to iterate the buckets in an EA. A new abstration of ocfs2_xattr_bucket is added. It records the bhs in this bucket and ocfs2_xattr_header. This keeps the code neat, improving readibility. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* xattr.h
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*
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* Function prototypes
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*
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* Copyright (C) 2008 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef OCFS2_XATTR_H
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#define OCFS2_XATTR_H
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#include <linux/init.h>
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#include <linux/xattr.h>
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enum ocfs2_xattr_type {
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OCFS2_XATTR_INDEX_USER = 1,
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OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS,
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OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
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OCFS2_XATTR_INDEX_TRUSTED,
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OCFS2_XATTR_INDEX_SECURITY,
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OCFS2_XATTR_MAX
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};
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extern struct xattr_handler ocfs2_xattr_user_handler;
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extern struct xattr_handler ocfs2_xattr_trusted_handler;
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extern ssize_t ocfs2_listxattr(struct dentry *, char *, size_t);
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extern int ocfs2_xattr_get(struct inode *, int, const char *, void *, size_t);
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extern int ocfs2_xattr_set(struct inode *, int, const char *, const void *,
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size_t, int);
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extern int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh);
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extern struct xattr_handler *ocfs2_xattr_handlers[];
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static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
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{
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return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
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}
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static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
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{
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return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
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}
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#endif /* OCFS2_XATTR_H */
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