xfs_vfsops.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,927 行 · 第 1/4 页

	int		flags,
	int             xflags,
	int             *bypassed)
{
	int		error = 0;
	int		last_error = 0;
	uint		log_flags = XFS_LOG_FORCE;
	xfs_buf_t	*bp;
	xfs_buf_log_item_t	*bip;

	/*
	 * Sync out the log.  This ensures that the log is periodically
	 * flushed even if there is not enough activity to fill it up.
	 */
	if (flags & SYNC_WAIT)
		log_flags |= XFS_LOG_SYNC;

	xfs_log_force(mp, (xfs_lsn_t)0, log_flags);

	if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
		if (flags & SYNC_BDFLUSH)
			xfs_finish_reclaim_all(mp, 1);
		else
			error = xfs_sync_inodes(mp, flags, xflags, bypassed);
	}

	/*
	 * Flushing out dirty data above probably generated more
	 * log activity, so if this isn't vfs_sync() then flush
	 * the log again.
	 */
	if (flags & SYNC_DELWRI) {
		xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
	}

	if (flags & SYNC_FSDATA) {
		/*
		 * If this is vfs_sync() then only sync the superblock
		 * if we can lock it without sleeping and it is not pinned.
		 */
		if (flags & SYNC_BDFLUSH) {
			bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
			if (bp != NULL) {
				bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
				if ((bip != NULL) &&
				    xfs_buf_item_dirty(bip)) {
					if (!(XFS_BUF_ISPINNED(bp))) {
						XFS_BUF_ASYNC(bp);
						error = xfs_bwrite(mp, bp);
					} else {
						xfs_buf_relse(bp);
					}
				} else {
					xfs_buf_relse(bp);
				}
			}
		} else {
			bp = xfs_getsb(mp, 0);
			/*
			 * If the buffer is pinned then push on the log so
			 * we won't get stuck waiting in the write for
			 * someone, maybe ourselves, to flush the log.
			 * Even though we just pushed the log above, we
			 * did not have the superblock buffer locked at
			 * that point so it can become pinned in between
			 * there and here.
			 */
			if (XFS_BUF_ISPINNED(bp))
				xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
			if (flags & SYNC_WAIT)
				XFS_BUF_UNASYNC(bp);
			else
				XFS_BUF_ASYNC(bp);
			error = xfs_bwrite(mp, bp);
		}
		if (error) {
			last_error = error;
		}
	}

	/*
	 * If this is the periodic sync, then kick some entries out of
	 * the reference cache.  This ensures that idle entries are
	 * eventually kicked out of the cache.
	 */
	if (flags & SYNC_REFCACHE) {
		xfs_refcache_purge_some(mp);
	}

	/*
	 * Now check to see if the log needs a "dummy" transaction.
	 */

	if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
		xfs_trans_t *tp;
		xfs_inode_t *ip;

		/*
		 * Put a dummy transaction in the log to tell
		 * recovery that all others are OK.
		 */
		tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
		if ((error = xfs_trans_reserve(tp, 0,
				XFS_ICHANGE_LOG_RES(mp),
				0, 0, 0)))  {
			xfs_trans_cancel(tp, 0);
			return error;
		}

		ip = mp->m_rootip;
		xfs_ilock(ip, XFS_ILOCK_EXCL);

		xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
		xfs_trans_ihold(tp, ip);
		xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
		error = xfs_trans_commit(tp, 0, NULL);
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
		xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
	}

	/*
	 * When shutting down, we need to insure that the AIL is pushed
	 * to disk or the filesystem can appear corrupt from the PROM.
	 */
	if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
		XFS_bflush(mp->m_ddev_targp);
		if (mp->m_rtdev_targp) {
			XFS_bflush(mp->m_rtdev_targp);
		}
	}

	return XFS_ERROR(last_error);
}

/*
 * xfs_vget - called by DMAPI to get vnode from file handle
 */
STATIC int
xfs_vget(
	bhv_desc_t	*bdp,
	vnode_t		**vpp,
	fid_t		*fidp)
{
	xfs_mount_t	*mp = XFS_BHVTOM(bdp);
	xfs_fid_t	*xfid = (struct xfs_fid *)fidp;
	xfs_inode_t	*ip;
	int		error;
	xfs_ino_t	ino;
	unsigned int	igen;

	/*
	 * Invalid.  Since handles can be created in user space and passed in
	 * via gethandle(), this is not cause for a panic.
	 */
	if (xfid->xfs_fid_len != sizeof(*xfid) - sizeof(xfid->xfs_fid_len))
		return XFS_ERROR(EINVAL);

	ino  = xfid->xfs_fid_ino;
	igen = xfid->xfs_fid_gen;

	/*
	 * NFS can sometimes send requests for ino 0.  Fail them gracefully.
	 */
	if (ino == 0)
		return XFS_ERROR(ESTALE);

	error = xfs_iget(mp, NULL, ino, XFS_ILOCK_SHARED, &ip, 0);
	if (error) {
		*vpp = NULL;
		return error;
	}

	if (ip == NULL) {
		*vpp = NULL;
		return XFS_ERROR(EIO);
	}

	if (ip->i_d.di_mode == 0 || (igen && (ip->i_d.di_gen != igen))) {
		xfs_iput_new(ip, XFS_ILOCK_SHARED);
		*vpp = NULL;
		return XFS_ERROR(ENOENT);
	}

	*vpp = XFS_ITOV(ip);
	xfs_iunlock(ip, XFS_ILOCK_SHARED);
	return 0;
}


#define MNTOPT_LOGBUFS	"logbufs"	/* number of XFS log buffers */
#define MNTOPT_LOGBSIZE	"logbsize"	/* size of XFS log buffers */
#define MNTOPT_LOGDEV	"logdev"	/* log device */
#define MNTOPT_RTDEV	"rtdev"		/* realtime I/O device */
#define MNTOPT_BIOSIZE	"biosize"	/* log2 of preferred buffered io size */
#define MNTOPT_WSYNC	"wsync"		/* safe-mode nfs compatible mount */
#define MNTOPT_INO64	"ino64"		/* force inodes into 64-bit range */
#define MNTOPT_NOALIGN	"noalign"	/* turn off stripe alignment */
#define MNTOPT_SWALLOC	"swalloc"	/* turn on stripe width allocation */
#define MNTOPT_SUNIT	"sunit"		/* data volume stripe unit */
#define MNTOPT_SWIDTH	"swidth"	/* data volume stripe width */
#define MNTOPT_NOUUID	"nouuid"	/* ignore filesystem UUID */
#define MNTOPT_MTPT	"mtpt"		/* filesystem mount point */
#define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
#define MNTOPT_NOLOGFLUSH   "nologflush"   /* don't hard flush on log writes */
#define MNTOPT_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */
#define MNTOPT_64BITINODE   "inode64"	/* inodes can be allocated anywhere */
#define MNTOPT_IKEEP	"ikeep"		/* do not free empty inode clusters */
#define MNTOPT_NOIKEEP	"noikeep"	/* free empty inode clusters */


int
xfs_parseargs(
	struct bhv_desc		*bhv,
	char			*options,
	struct xfs_mount_args	*args,
	int			update)
{
	struct vfs		*vfsp = bhvtovfs(bhv);
	char			*this_char, *value, *eov;
	int			dsunit, dswidth, vol_dsunit, vol_dswidth;
	int			iosize;

#if 0	/* XXX: off by default, until some remaining issues ironed out */
	args->flags |= XFSMNT_IDELETE; /* default to on */
#endif

	if (!options)
		return 0;

	iosize = dsunit = dswidth = vol_dsunit = vol_dswidth = 0;

	while ((this_char = strsep(&options, ",")) != NULL) {
		if (!*this_char)
			continue;
		if ((value = strchr(this_char, '=')) != NULL)
			*value++ = 0;

		if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_LOGBUFS);
				return EINVAL;
			}
			args->logbufs = simple_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
			int	last, in_kilobytes = 0;

			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_LOGBSIZE);
				return EINVAL;
			}
			last = strlen(value) - 1;
			if (value[last] == 'K' || value[last] == 'k') {
				in_kilobytes = 1;
				value[last] = '\0';
			}
			args->logbufsize = simple_strtoul(value, &eov, 10);
			if (in_kilobytes)
				args->logbufsize <<= 10;
		} else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_LOGDEV);
				return EINVAL;
			}
			strncpy(args->logname, value, MAXNAMELEN);
		} else if (!strcmp(this_char, MNTOPT_MTPT)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_MTPT);
				return EINVAL;
			}
			strncpy(args->mtpt, value, MAXNAMELEN);
		} else if (!strcmp(this_char, MNTOPT_RTDEV)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_RTDEV);
				return EINVAL;
			}
			strncpy(args->rtname, value, MAXNAMELEN);
		} else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_BIOSIZE); 
				return EINVAL;
			}
			iosize = simple_strtoul(value, &eov, 10);
			args->flags |= XFSMNT_IOSIZE;
			args->iosizelog = (uint8_t) iosize;
		} else if (!strcmp(this_char, MNTOPT_WSYNC)) {
			args->flags |= XFSMNT_WSYNC;
		} else if (!strcmp(this_char, MNTOPT_OSYNCISOSYNC)) {
			args->flags |= XFSMNT_OSYNCISOSYNC;
		} else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
			args->flags |= XFSMNT_NORECOVERY;
		} else if (!strcmp(this_char, MNTOPT_INO64)) {
			args->flags |= XFSMNT_INO64;
#if !XFS_BIG_INUMS
			printk("XFS: %s option not allowed on this system\n",
				MNTOPT_INO64);
			return EINVAL;
#endif
		} else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
			args->flags |= XFSMNT_NOALIGN;
		} else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
			args->flags |= XFSMNT_SWALLOC;
		} else if (!strcmp(this_char, MNTOPT_SUNIT)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_SUNIT);
				return EINVAL;
			}
			dsunit = simple_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
			if (!value || !*value) {
				printk("XFS: %s option requires an argument\n",
					MNTOPT_SWIDTH);
				return EINVAL;
			}
			dswidth = simple_strtoul(value, &eov, 10);
		} else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
			args->flags &= ~XFSMNT_32BITINODES;
#if !XFS_BIG_INUMS
			printk("XFS: %s option not allowed on this system\n",
				MNTOPT_64BITINODE);
			return EINVAL;
#endif
		} else if (!strcmp(this_char, MNTOPT_NOUUID)) {
			args->flags |= XFSMNT_NOUUID;
		} else if (!strcmp(this_char, MNTOPT_NOLOGFLUSH)) {
			args->flags |= XFSMNT_NOLOGFLUSH;
		} else if (!strcmp(this_char, MNTOPT_IKEEP)) {
			args->flags &= ~XFSMNT_IDELETE;
		} else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
			args->flags |= XFSMNT_IDELETE;
		} else if (!strcmp(this_char, "osyncisdsync")) {
			/* no-op, this is now the default */
printk("XFS: osyncisdsync is now the default, option is deprecated.\n");
		} else if (!strcmp(this_char, "irixsgid")) {
printk("XFS: irixsgid is now a sysctl(2) variable, option is deprecated.\n");
		} else {
			printk("XFS: unknown mount option [%s].\n", this_char);
			return EINVAL;
		}
	}

	if (args->flags & XFSMNT_NORECOVERY) {
		if ((vfsp->vfs_flag & VFS_RDONLY) == 0) {
			printk("XFS: no-recovery mounts must be read-only.\n");
			return EINVAL;
		}
	}

	if ((args->flags & XFSMNT_NOALIGN) && (dsunit || dswidth)) {
		printk(
	"XFS: sunit and swidth options incompatible with the noalign option\n");
		return EINVAL;
	}

	if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
		printk("XFS: sunit and swidth must be specified together\n");
		return EINVAL;
	}

	if (dsunit && (dswidth % dsunit != 0)) {
		printk(
	"XFS: stripe width (%d) must be a multiple of the stripe unit (%d)\n",
			dswidth, dsunit);
		return EINVAL;
	}

	if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
		if (dsunit) {
			args->sunit = dsunit;
			args->flags |= XFSMNT_RETERR;
		} else {
			args->sunit = vol_dsunit;
		}
		dswidth ? (args->swidth = dswidth) :
			  (args->swidth = vol_dswidth);
	} else {
		args->sunit = args->swidth = 0;
	}

	return 0;
}

int
xfs_showargs(
	struct bhv_desc		*bhv,
	struct seq_file		*m)
{
	static struct proc_xfs_info {
		int	flag;
		char	*str;
	} xfs_info[] = {
		/* the few simple ones we can get from the mount struct */
		{ XFS_MOUNT_WSYNC,		"," MNTOPT_WSYNC },
		{ XFS_MOUNT_INO64,		"," MNTOPT_INO64 },
		{ XFS_MOUNT_NOALIGN,		"," MNTOPT_NOALIGN },
		{ XFS_MOUNT_SWALLOC,		"," MNTOPT_SWALLOC },
		{ XFS_MOUNT_NOUUID,		"," MNTOPT_NOUUID },
		{ XFS_MOUNT_NORECOVERY,		"," MNTOPT_NORECOVERY },
		{ XFS_MOUNT_OSYNCISOSYNC,	"," MNTOPT_OSYNCISOSYNC },
		{ XFS_MOUNT_NOLOGFLUSH,		"," MNTOPT_NOLOGFLUSH },
		{ XFS_MOUNT_IDELETE,		"," MNTOPT_NOIKEEP },
		{ 0, NULL }
	};
	struct proc_xfs_info	*xfs_infop;
	struct xfs_mount	*mp = XFS_BHVTOM(bhv);

	for (xfs_infop = xfs_info; xfs_infop->flag; xfs_infop++) {
		if (mp->m_flags & xfs_infop->flag)
			seq_puts(m, xfs_infop->str);
	}

	if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
		seq_printf(m, "," MNTOPT_BIOSIZE "=%d", mp->m_writeio_log);

	if (mp->m_logbufs > 0)
		seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);

	if (mp->m_logbsize > 0)
		seq_printf(m, "," MNTOPT_LOGBSIZE "=%d", mp->m_logbsize);

	if (mp->m_ddev_targp != mp->m_logdev_targp)
		seq_printf(m, "," MNTOPT_LOGDEV "=%s",
				XFS_BUFTARG_NAME(mp->m_logdev_targp));

	if (mp->m_rtdev_targp && mp->m_ddev_targp != mp->m_rtdev_targp)
		seq_printf(m, "," MNTOPT_RTDEV "=%s",
				XFS_BUFTARG_NAME(mp->m_rtdev_targp));

	if (mp->m_dalign > 0)
		seq_printf(m, "," MNTOPT_SUNIT "=%d",
				(int)XFS_FSB_TO_BB(mp, mp->m_dalign));

	if (mp->m_swidth > 0)
		seq_printf(m, "," MNTOPT_SWIDTH "=%d",
				(int)XFS_FSB_TO_BB(mp, mp->m_swidth));

	if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT))
		seq_printf(m, "," MNTOPT_64BITINODE);
	
	return 0;
}

STATIC void
xfs_freeze(
	bhv_desc_t	*bdp)
{
	xfs_mount_t	*mp = XFS_BHVTOM(bdp);

	while (atomic_read(&mp->m_active_trans) > 0)
		delay(100);

	/* Push the superblock and write an unmount record */
	xfs_log_unmount_write(mp);
	xfs_unmountfs_writesb(mp);
}


vfsops_t xfs_vfsops = {
	BHV_IDENTITY_INIT(VFS_BHV_XFS,VFS_POSITION_XFS),
	.vfs_parseargs		= xfs_parseargs,
	.vfs_showargs		= xfs_showargs,
	.vfs_mount		= xfs_mount,
	.vfs_unmount		= xfs_unmount,
	.vfs_mntupdate		= xfs_mntupdate,
	.vfs_root		= xfs_root,
	.vfs_statvfs		= xfs_statvfs,
	.vfs_sync		= xfs_sync,
	.vfs_vget		= xfs_vget,
	.vfs_dmapiops		= (vfs_dmapiops_t)fs_nosys,
	.vfs_quotactl		= (vfs_quotactl_t)fs_nosys,
	.vfs_init_vnode		= xfs_initialize_vnode,
	.vfs_force_shutdown	= xfs_do_force_shutdown,
	.vfs_freeze		= xfs_freeze,
};