xfs_itable.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 807 行 · 第 1/2 页

/*
 * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include "xfs.h"
#include "xfs_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_ag.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_error.h"

#ifndef HAVE_USERACC
#define useracc(ubuffer, size, flags, foo) (0)
#define unuseracc(ubuffer, size, flags)
#endif

/*
 * Return stat information for one inode.
 * Return 0 if ok, else errno.
 */
int		       		/* error status */
xfs_bulkstat_one(
	xfs_mount_t	*mp,		/* mount point for filesystem */
	xfs_ino_t	ino,		/* inode number to get data for */
	void		__user *buffer,	/* buffer to place output in */
	int		ubsize,		/* size of buffer */
	void		*private_data,	/* my private data */
	xfs_daddr_t	bno,		/* starting bno of inode cluster */
	int		*ubused,	/* bytes used by me */
	void		*dibuff,	/* on-disk inode buffer */
	int		*stat)		/* BULKSTAT_RV_... */
{
	xfs_bstat_t	*buf;		/* return buffer */
	int		error;		/* error value */
	xfs_dinode_t	*dip;		/* dinode inode pointer */
	xfs_dinode_core_t *dic;		/* dinode core info pointer */
	xfs_inode_t	*ip = NULL;	/* incore inode pointer */
	xfs_arch_t      arch;           /* these are set according to      */

	dip = (xfs_dinode_t *)dibuff;

	if (!buffer || ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
	    (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
	     (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino))) {
		*stat = BULKSTAT_RV_NOTHING;
		return XFS_ERROR(EINVAL);
	}
	if (ubsize < sizeof(*buf)) {
		*stat = BULKSTAT_RV_NOTHING;
		return XFS_ERROR(ENOMEM);
	}

	buf = kmem_alloc(sizeof(*buf), KM_SLEEP);

	if (dip == NULL) {
		/* We're not being passed a pointer to a dinode.  This happens
		 * if BULKSTAT_FG_IGET is selected.  Do the iget.
		 */
		error = xfs_iget(mp, NULL, ino, XFS_ILOCK_SHARED, &ip, bno);
		if (error) {
			*stat = BULKSTAT_RV_NOTHING;
			return error;
		}
		ASSERT(ip != NULL);
		ASSERT(ip->i_blkno != (xfs_daddr_t)0);
		if (ip->i_d.di_mode == 0) {
			xfs_iput_new(ip, XFS_ILOCK_SHARED);
			*stat = BULKSTAT_RV_NOTHING;
			kmem_free(buf, sizeof(*buf));
			return XFS_ERROR(ENOENT);
		}
		dic = &ip->i_d;
		arch = ARCH_NOCONVERT;		/* in-core! */
		ASSERT(dic != NULL);

		/* xfs_iget returns the following without needing
		 * further change.
		 */
		buf->bs_nlink = dic->di_nlink;
		buf->bs_projid = dic->di_projid;

	} else {
		dic = &dip->di_core;
		ASSERT(dic != NULL);

		/* buffer dinode_core is in on-disk arch */
		arch = ARCH_CONVERT;

		/*
		 * The inode format changed when we moved the link count and
		 * made it 32 bits long.  If this is an old format inode,
		 * convert it in memory to look like a new one.  If it gets
		 * flushed to disk we will convert back before flushing or
		 * logging it.  We zero out the new projid field and the old link
		 * count field.  We'll handle clearing the pad field (the remains
		 * of the old uuid field) when we actually convert the inode to
		 * the new format. We don't change the version number so that we
		 * can distinguish this from a real new format inode.
		 */
		if (INT_GET(dic->di_version, arch) == XFS_DINODE_VERSION_1) {
			buf->bs_nlink = INT_GET(dic->di_onlink, arch);
			buf->bs_projid = 0;
		}
		else {
			buf->bs_nlink = INT_GET(dic->di_nlink, arch);
			buf->bs_projid = INT_GET(dic->di_projid, arch);
		}

	}

	buf->bs_ino = ino;
	buf->bs_mode = INT_GET(dic->di_mode, arch);
	buf->bs_uid = INT_GET(dic->di_uid, arch);
	buf->bs_gid = INT_GET(dic->di_gid, arch);
	buf->bs_size = INT_GET(dic->di_size, arch);
	buf->bs_atime.tv_sec = INT_GET(dic->di_atime.t_sec, arch);
	buf->bs_atime.tv_nsec = INT_GET(dic->di_atime.t_nsec, arch);
	buf->bs_mtime.tv_sec = INT_GET(dic->di_mtime.t_sec, arch);
	buf->bs_mtime.tv_nsec = INT_GET(dic->di_mtime.t_nsec, arch);
	buf->bs_ctime.tv_sec = INT_GET(dic->di_ctime.t_sec, arch);
	buf->bs_ctime.tv_nsec = INT_GET(dic->di_ctime.t_nsec, arch);
	buf->bs_xflags = xfs_dic2xflags(dic, arch);
	buf->bs_extsize = INT_GET(dic->di_extsize, arch) << mp->m_sb.sb_blocklog;
	buf->bs_extents = INT_GET(dic->di_nextents, arch);
	buf->bs_gen = INT_GET(dic->di_gen, arch);
	memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
	buf->bs_dmevmask = INT_GET(dic->di_dmevmask, arch);
	buf->bs_dmstate = INT_GET(dic->di_dmstate, arch);
	buf->bs_aextents = INT_GET(dic->di_anextents, arch);

	switch (INT_GET(dic->di_format, arch)) {
	case XFS_DINODE_FMT_DEV:
		if ( ip ) {
			buf->bs_rdev = ip->i_df.if_u2.if_rdev;
		} else {
			buf->bs_rdev = INT_GET(dip->di_u.di_dev, arch);
		}

		buf->bs_blksize = BLKDEV_IOSIZE;
		buf->bs_blocks = 0;
		break;
	case XFS_DINODE_FMT_LOCAL:
	case XFS_DINODE_FMT_UUID:
		buf->bs_rdev = 0;
		buf->bs_blksize = mp->m_sb.sb_blocksize;
		buf->bs_blocks = 0;
		break;
	case XFS_DINODE_FMT_EXTENTS:
	case XFS_DINODE_FMT_BTREE:
		buf->bs_rdev = 0;
		buf->bs_blksize = mp->m_sb.sb_blocksize;
		if ( ip ) {
			buf->bs_blocks = INT_GET(dic->di_nblocks, arch) + ip->i_delayed_blks;
		} else {
			buf->bs_blocks = INT_GET(dic->di_nblocks, arch);
		}
		break;
	}

	if (ip) {
		xfs_iput(ip, XFS_ILOCK_SHARED);
	}

	if (copy_to_user(buffer, buf, sizeof(*buf)))  {
		kmem_free(buf, sizeof(*buf));
		*stat = BULKSTAT_RV_NOTHING;
		return EFAULT;
	}

	kmem_free(buf, sizeof(*buf));
	*stat = BULKSTAT_RV_DIDONE;
	if (ubused)
		*ubused = sizeof(*buf);
	return 0;
}

/*
 * Return stat information in bulk (by-inode) for the filesystem.
 */
int					/* error status */
xfs_bulkstat(
	xfs_mount_t		*mp,	/* mount point for filesystem */
	xfs_ino_t		*lastinop, /* last inode returned */
	int			*ubcountp, /* size of buffer/count returned */
	bulkstat_one_pf		formatter, /* func that'd fill a single buf */
	void			*private_data,/* private data for formatter */
	size_t			statstruct_size, /* sizeof struct filling */
	char			__user *ubuffer, /* buffer with inode stats */
	int			flags,	/* defined in xfs_itable.h */
	int			*done)	/* 1 if there're more stats to get */
{
	xfs_agblock_t		agbno=0;/* allocation group block number */
	xfs_buf_t		*agbp;	/* agi header buffer */
	xfs_agi_t		*agi;	/* agi header data */
	xfs_agino_t		agino;	/* inode # in allocation group */
	xfs_agnumber_t		agno;	/* allocation group number */
	xfs_daddr_t		bno;	/* inode cluster start daddr */
	int			chunkidx; /* current index into inode chunk */
	int			clustidx; /* current index into inode cluster */
	xfs_btree_cur_t		*cur;	/* btree cursor for ialloc btree */
	int			end_of_ag; /* set if we've seen the ag end */
	int			error;	/* error code */
	int                     fmterror;/* bulkstat formatter result */
	__int32_t		gcnt;	/* current btree rec's count */
	xfs_inofree_t		gfree;	/* current btree rec's free mask */
	xfs_agino_t		gino;	/* current btree rec's start inode */
	int			i;	/* loop index */
	int			icount;	/* count of inodes good in irbuf */
	xfs_ino_t		ino;	/* inode number (filesystem) */
	xfs_inobt_rec_t		*irbp;	/* current irec buffer pointer */
	xfs_inobt_rec_t		*irbuf;	/* start of irec buffer */
	xfs_inobt_rec_t		*irbufend; /* end of good irec buffer entries */
	xfs_ino_t		lastino=0; /* last inode number returned */
	int			nbcluster; /* # of blocks in a cluster */
	int			nicluster; /* # of inodes in a cluster */
	int			nimask;	/* mask for inode clusters */
	int			nirbuf;	/* size of irbuf */
	int			rval;	/* return value error code */
	int			tmp;	/* result value from btree calls */
	int			ubcount; /* size of user's buffer */
	int			ubleft;	/* bytes left in user's buffer */
	char			__user *ubufp;	/* pointer into user's buffer */
	int			ubelem;	/* spaces used in user's buffer */
	int			ubused;	/* bytes used by formatter */
	xfs_buf_t		*bp;	/* ptr to on-disk inode cluster buf */
	xfs_dinode_t		*dip;	/* ptr into bp for specific inode */
	xfs_inode_t		*ip;	/* ptr to in-core inode struct */

	/*
	 * Get the last inode value, see if there's nothing to do.
	 */
	ino = (xfs_ino_t)*lastinop;
	dip = NULL;
	agno = XFS_INO_TO_AGNO(mp, ino);
	agino = XFS_INO_TO_AGINO(mp, ino);
	if (agno >= mp->m_sb.sb_agcount ||
	    ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
		*done = 1;
		*ubcountp = 0;
		return 0;
	}
	ubcount = *ubcountp; /* statstruct's */
	ubleft = ubcount * statstruct_size; /* bytes */
	*ubcountp = ubelem = 0;
	*done = 0;
	fmterror = 0;
	ubufp = ubuffer;
	nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
		mp->m_sb.sb_inopblock :
		(XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
	nimask = ~(nicluster - 1);
	nbcluster = nicluster >> mp->m_sb.sb_inopblog;
	/*
	 * Lock down the user's buffer. If a buffer was not sent, as in the case
	 * disk quota code calls here, we skip this.
	 */
	if (ubuffer &&
	    (error = useracc(ubuffer, ubcount * statstruct_size,
			(B_READ|B_PHYS), NULL))) {
		return error;
	}
	/*
	 * Allocate a page-sized buffer for inode btree records.
	 * We could try allocating something smaller, but for normal
	 * calls we'll always (potentially) need the whole page.
	 */
	irbuf = kmem_alloc(NBPC, KM_SLEEP);
	nirbuf = NBPC / sizeof(*irbuf);
	/*
	 * Loop over the allocation groups, starting from the last
	 * inode returned; 0 means start of the allocation group.
	 */
	rval = 0;
	while (ubleft >= statstruct_size && agno < mp->m_sb.sb_agcount) {
		bp = NULL;
		down_read(&mp->m_peraglock);
		error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
		up_read(&mp->m_peraglock);
		if (error) {
			/*
			 * Skip this allocation group and go to the next one.
			 */
			agno++;
			agino = 0;
			continue;
		}
		agi = XFS_BUF_TO_AGI(agbp);
		/*
		 * Allocate and initialize a btree cursor for ialloc btree.
		 */
		cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
			(xfs_inode_t *)0, 0);
		irbp = irbuf;
		irbufend = irbuf + nirbuf;
		end_of_ag = 0;
		/*
		 * If we're returning in the middle of an allocation group,
		 * we need to get the remainder of the chunk we're in.
		 */
		if (agino > 0) {
			/*
			 * Lookup the inode chunk that this inode lives in.
			 */
			error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
			if (!error &&	/* no I/O error */
			    tmp &&	/* lookup succeeded */
					/* got the record, should always work */
			    !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
				    &gfree, &i, ARCH_NOCONVERT)) &&
			    i == 1 &&
					/* this is the right chunk */
			    agino < gino + XFS_INODES_PER_CHUNK &&
					/* lastino was not last in chunk */
			    (chunkidx = agino - gino + 1) <
				    XFS_INODES_PER_CHUNK &&
					/* there are some left allocated */
			    XFS_INOBT_MASKN(chunkidx,
				    XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
				/*
				 * Grab the chunk record.  Mark all the
				 * uninteresting inodes (because they're
				 * before our start point) free.
				 */
				for (i = 0; i < chunkidx; i++) {
					if (XFS_INOBT_MASK(i) & ~gfree)
						gcnt++;
				}
				gfree |= XFS_INOBT_MASKN(0, chunkidx);
				INT_SET(irbp->ir_startino, ARCH_CONVERT, gino);
				INT_SET(irbp->ir_freecount, ARCH_CONVERT, gcnt);
				INT_SET(irbp->ir_free, ARCH_CONVERT, gfree);
				irbp++;
				agino = gino + XFS_INODES_PER_CHUNK;
				icount = XFS_INODES_PER_CHUNK - gcnt;
			} else {
				/*
				 * If any of those tests failed, bump the
				 * inode number (just in case).
				 */
				agino++;
				icount = 0;
			}
			/*
			 * In any case, increment to the next record.
			 */
			if (!error)
				error = xfs_inobt_increment(cur, 0, &tmp);
		} else {
			/*
			 * Start of ag.  Lookup the first inode chunk.
			 */
			error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
			icount = 0;
		}
		/*
		 * Loop through inode btree records in this ag,
		 * until we run out of inodes or space in the buffer.
		 */