xfs_itable.c

linux 内核源代码

/*
 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_error.h"
#include "xfs_btree.h"

int
xfs_internal_inum(
	xfs_mount_t	*mp,
	xfs_ino_t	ino)
{
	return (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)));
}

STATIC int
xfs_bulkstat_one_iget(
	xfs_mount_t	*mp,		/* mount point for filesystem */
	xfs_ino_t	ino,		/* inode number to get data for */
	xfs_daddr_t	bno,		/* starting bno of inode cluster */
	xfs_bstat_t	*buf,		/* return buffer */
	int		*stat)		/* BULKSTAT_RV_... */
{
	xfs_icdinode_t	*dic;	/* dinode core info pointer */
	xfs_inode_t	*ip;		/* incore inode pointer */
	bhv_vnode_t	*vp;
	int		error;

	error = xfs_iget(mp, NULL, ino,
			 XFS_IGET_BULKSTAT, 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) {
		*stat = BULKSTAT_RV_NOTHING;
		error = XFS_ERROR(ENOENT);
		goto out_iput;
	}

	vp = XFS_ITOV(ip);
	dic = &ip->i_d;

	/* xfs_iget returns the following without needing
	 * further change.
	 */
	buf->bs_nlink = dic->di_nlink;
	buf->bs_projid = dic->di_projid;
	buf->bs_ino = ino;
	buf->bs_mode = dic->di_mode;
	buf->bs_uid = dic->di_uid;
	buf->bs_gid = dic->di_gid;
	buf->bs_size = dic->di_size;
	vn_atime_to_bstime(vp, &buf->bs_atime);
	buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
	buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
	buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
	buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
	buf->bs_xflags = xfs_ip2xflags(ip);
	buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
	buf->bs_extents = dic->di_nextents;
	buf->bs_gen = dic->di_gen;
	memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
	buf->bs_dmevmask = dic->di_dmevmask;
	buf->bs_dmstate = dic->di_dmstate;
	buf->bs_aextents = dic->di_anextents;

	switch (dic->di_format) {
	case XFS_DINODE_FMT_DEV:
		buf->bs_rdev = ip->i_df.if_u2.if_rdev;
		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;
		buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
		break;
	}

 out_iput:
	xfs_iput(ip, XFS_ILOCK_SHARED);
	return error;
}

STATIC int
xfs_bulkstat_one_dinode(
	xfs_mount_t	*mp,		/* mount point for filesystem */
	xfs_ino_t	ino,		/* inode number to get data for */
	xfs_dinode_t	*dip,		/* dinode inode pointer */
	xfs_bstat_t	*buf)		/* return buffer */
{
	xfs_dinode_core_t *dic;		/* dinode core info pointer */

	dic = &dip->di_core;

	/*
	 * 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 (dic->di_version == XFS_DINODE_VERSION_1) {
		buf->bs_nlink = be16_to_cpu(dic->di_onlink);
		buf->bs_projid = 0;
	} else {
		buf->bs_nlink = be32_to_cpu(dic->di_nlink);
		buf->bs_projid = be16_to_cpu(dic->di_projid);
	}

	buf->bs_ino = ino;
	buf->bs_mode = be16_to_cpu(dic->di_mode);
	buf->bs_uid = be32_to_cpu(dic->di_uid);
	buf->bs_gid = be32_to_cpu(dic->di_gid);
	buf->bs_size = be64_to_cpu(dic->di_size);
	buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
	buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
	buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
	buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
	buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
	buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
	buf->bs_xflags = xfs_dic2xflags(dic);
	buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
	buf->bs_extents = be32_to_cpu(dic->di_nextents);
	buf->bs_gen = be32_to_cpu(dic->di_gen);
	memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
	buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
	buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
	buf->bs_aextents = be16_to_cpu(dic->di_anextents);

	switch (dic->di_format) {
	case XFS_DINODE_FMT_DEV:
		buf->bs_rdev = be32_to_cpu(dip->di_u.di_dev);
		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;
		buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
		break;
	}

	return 0;
}

STATIC int
xfs_bulkstat_one_fmt(
	void			__user *ubuffer,
	const xfs_bstat_t	*buffer)
{
	if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
		return -EFAULT;
	return sizeof(*buffer);
}

/*
 * 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 = 0;	/* error value */
	xfs_dinode_t	*dip;		/* dinode inode pointer */
	bulkstat_one_fmt_pf formatter = private_data ? : xfs_bulkstat_one_fmt;

	dip = (xfs_dinode_t *)dibuff;
	*stat = BULKSTAT_RV_NOTHING;

	if (!buffer || xfs_internal_inum(mp, ino))
		return XFS_ERROR(EINVAL);
	if (ubsize < sizeof(*buf))
		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_bulkstat_one_iget(mp, ino, bno, buf, stat);
		if (error)
			goto out_free;
	} else {
		xfs_bulkstat_one_dinode(mp, ino, dip, buf);
	}

	error = formatter(buffer, buf);
	if (error < 0)  {
		error = EFAULT;
		goto out_free;
	}

	*stat = BULKSTAT_RV_DIDONE;
	if (ubused)
		*ubused = error;

 out_free:
	kmem_free(buf, sizeof(*buf));
	return error;
}

/*
 * Test to see whether we can use the ondisk inode directly, based
 * on the given bulkstat flags, filling in dipp accordingly.
 * Returns zero if the inode is dodgey.
 */
STATIC int
xfs_bulkstat_use_dinode(
	xfs_mount_t	*mp,
	int		flags,
	xfs_buf_t	*bp,
	int		clustidx,
	xfs_dinode_t	**dipp)
{
	xfs_dinode_t	*dip;
	unsigned int	aformat;

	*dipp = NULL;
	if (!bp || (flags & BULKSTAT_FG_IGET))
		return 1;
	dip = (xfs_dinode_t *)
			xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
	/*
	 * Check the buffer containing the on-disk inode for di_nlink == 0.
	 * This is to prevent xfs_bulkstat from picking up just reclaimed
	 * inodes that have their in-core state initialized but not flushed
	 * to disk yet. This is a temporary hack that would require a proper
	 * fix in the future.
	 */
	if (be16_to_cpu(dip->di_core.di_magic) != XFS_DINODE_MAGIC ||
	    !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version) ||
	    !dip->di_core.di_nlink)
		return 0;
	if (flags & BULKSTAT_FG_QUICK) {
		*dipp = dip;
		return 1;
	}
	/* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
	aformat = dip->di_core.di_aformat;
	if ((XFS_CFORK_Q(&dip->di_core) == 0) ||
	    (aformat == XFS_DINODE_FMT_LOCAL) ||
	    (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
		*dipp = dip;
		return 1;
	}
	return 1;
}

#define XFS_BULKSTAT_UBLEFT(ubleft)	((ubleft) >= statstruct_size)

/*
 * 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 are 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 */
	size_t			irbsize; /* size of irec buffer in bytes */
	xfs_ino_t		ino;	/* inode number (filesystem) */
	xfs_inobt_rec_incore_t	*irbp;	/* current irec buffer pointer */
	xfs_inobt_rec_incore_t	*irbuf;	/* start of irec buffer */
	xfs_inobt_rec_incore_t	*irbufend; /* end of good irec buffer entries */
	xfs_ino_t		lastino; /* 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;
	lastino = ino;
	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;
	}
	if (!ubcountp || *ubcountp <= 0) {
		return EINVAL;
	}
	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;
	irbuf = kmem_zalloc_greedy(&irbsize, NBPC, NBPC * 4,
				   KM_SLEEP | KM_MAYFAIL | KM_LARGE);
	nirbuf = irbsize / sizeof(*irbuf);

	/*
	 * Loop over the allocation groups, starting from the last
	 * inode returned; 0 means start of the allocation group.
	 */
	rval = 0;
	while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
		cond_resched();
		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)) &&
			    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);