Commit 0771fb45 authored by Eric Sandeen's avatar Eric Sandeen Committed by Lachlan McIlroy
Browse files

[XFS] Refactor xfs_mountfs 



Refactoring xfs_mountfs() to call sub-functions for logical chunks can
help save a bit of stack, and can make it easier to read this long
function.

The mount path is one of the longest common callchains, easily getting to
within a few bytes of the end of a 4k stack when over lvm, quotas are
enabled, and quotacheck must be done.

With this change on top of the other stack-related changes I've sent, I
can get xfs to survive a normal xfsqa run on 4k stacks over lvm.

SGI-PV: 971186
SGI-Modid: xfs-linux-melb:xfs-kern:29834a

Signed-off-by: default avatarEric Sandeen <sandeen@sandeen.net>
Signed-off-by: default avatarDonald Douwsma <donaldd@sgi.com>
Signed-off-by: default avatarTim Shimmin <tes@sgi.com>
parent b53e675d

fs/xfs/xfs_mount.c

+162 −105
Original line number Diff line number Diff line
@@ -733,49 +733,13 @@ xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) 
}



/*

 * xfs_mountfs

 *

 * This function does the following on an initial mount of a file system:

 *	- reads the superblock from disk and init the mount struct

 *	- if we're a 32-bit kernel, do a size check on the superblock

 *		so we don't mount terabyte filesystems

 *	- init mount struct realtime fields

 *	- allocate inode hash table for fs

 *	- init directory manager

 *	- perform recovery and init the log manager

 * Update alignment values based on mount options and sb values

 */

int

xfs_mountfs(

	xfs_mount_t	*mp,

	int		mfsi_flags)

STATIC int

xfs_update_alignment(xfs_mount_t *mp, int mfsi_flags, __uint64_t *update_flags)

{

	xfs_buf_t	*bp;

	xfs_sb_t	*sbp = &(mp->m_sb);

	xfs_inode_t	*rip;

	bhv_vnode_t	*rvp = NULL;

	int		readio_log, writeio_log;

	xfs_daddr_t	d;

	__uint64_t	resblks;

	__int64_t	update_flags;

	uint		quotamount, quotaflags;

	int		agno;

	int		uuid_mounted = 0;

	int		error = 0;



	if (mp->m_sb_bp == NULL) {

		if ((error = xfs_readsb(mp, mfsi_flags))) {

			return error;

		}

	}

	xfs_mount_common(mp, sbp);



	/*

	 * Check if sb_agblocks is aligned at stripe boundary

	 * If sb_agblocks is NOT aligned turn off m_dalign since

	 * allocator alignment is within an ag, therefore ag has

	 * to be aligned at stripe boundary.

	 */

	update_flags = 0LL;

	if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {

		/*

		 * If stripe unit and stripe width are not multiples
@@ -786,8 +750,7 @@ xfs_mountfs( 
			if (mp->m_flags & XFS_MOUNT_RETERR) {

				cmn_err(CE_WARN,

					"XFS: alignment check 1 failed");

				error = XFS_ERROR(EINVAL);

				goto error1;

				return XFS_ERROR(EINVAL);

			}

			mp->m_dalign = mp->m_swidth = 0;

		} else {
@@ -797,8 +760,7 @@ xfs_mountfs( 
			mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);

			if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {

				if (mp->m_flags & XFS_MOUNT_RETERR) {

					error = XFS_ERROR(EINVAL);

					goto error1;

					return XFS_ERROR(EINVAL);

				}

				xfs_fs_cmn_err(CE_WARN, mp,

"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
@@ -815,8 +777,7 @@ xfs_mountfs( 
"stripe alignment turned off: sunit(%d) less than bsize(%d)",

                                        	mp->m_dalign,

						mp->m_blockmask +1);

					error = XFS_ERROR(EINVAL);

					goto error1;

					return XFS_ERROR(EINVAL);

				}

				mp->m_swidth = 0;

			}
@@ -829,11 +790,11 @@ xfs_mountfs( 
		if (XFS_SB_VERSION_HASDALIGN(sbp)) {

			if (sbp->sb_unit != mp->m_dalign) {

				sbp->sb_unit = mp->m_dalign;

				update_flags |= XFS_SB_UNIT;

				*update_flags |= XFS_SB_UNIT;

			}

			if (sbp->sb_width != mp->m_swidth) {

				sbp->sb_width = mp->m_swidth;

				update_flags |= XFS_SB_WIDTH;

				*update_flags |= XFS_SB_WIDTH;

			}

		}

	} else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
@@ -842,41 +803,31 @@ xfs_mountfs( 
			mp->m_swidth = sbp->sb_width;

	}



	xfs_alloc_compute_maxlevels(mp);

	xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);

	xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);

	xfs_ialloc_compute_maxlevels(mp);

	return 0;

}



	if (sbp->sb_imax_pct) {

/*

 * Set the maximum inode count for this filesystem

 */

STATIC void

xfs_set_maxicount(xfs_mount_t *mp)

{

	xfs_sb_t	*sbp = &(mp->m_sb);

	__uint64_t	icount;



		/* Make sure the maximum inode count is a multiple of the

		 * units we allocate inodes in.

	if (sbp->sb_imax_pct) {

		/*

		 * Make sure the maximum inode count is a multiple

		 * of the units we allocate inodes in.

		 */



		icount = sbp->sb_dblocks * sbp->sb_imax_pct;

		do_div(icount, 100);

		do_div(icount, mp->m_ialloc_blks);

		mp->m_maxicount = (icount * mp->m_ialloc_blks)  <<

				   sbp->sb_inopblog;

	} else

	} else {

		mp->m_maxicount = 0;



	mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);



	/*

	 * XFS uses the uuid from the superblock as the unique

	 * identifier for fsid.  We can not use the uuid from the volume

	 * since a single partition filesystem is identical to a single

	 * partition volume/filesystem.

	 */

	if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&

	    (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {

		if (xfs_uuid_mount(mp)) {

			error = XFS_ERROR(EINVAL);

			goto error1;

	}

		uuid_mounted=1;

}



/*
@@ -885,6 +836,12 @@ xfs_mountfs( 
 * We use smaller I/O sizes when the file system

 * is being used for NFS service (wsync mount option).

 */

STATIC void

xfs_set_rw_sizes(xfs_mount_t *mp)

{

	xfs_sb_t	*sbp = &(mp->m_sb);

	int		readio_log, writeio_log;



	if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {

		if (mp->m_flags & XFS_MOUNT_WSYNC) {

			readio_log = XFS_WSYNC_READIO_LOG;
@@ -910,17 +867,14 @@ xfs_mountfs( 
		mp->m_writeio_log = writeio_log;

	}

	mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);



	/*

	 * Set the inode cluster size.

	 * This may still be overridden by the file system

	 * block size if it is larger than the chosen cluster size.

	 */

	mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;

}



/*

 * Set whether we're using inode alignment.

 */

STATIC void

xfs_set_inoalignment(xfs_mount_t *mp)

{

	if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&

	    mp->m_sb.sb_inoalignmt >=

	    XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
@@ -936,14 +890,22 @@ xfs_mountfs( 
		mp->m_sinoalign = mp->m_dalign;

	else

		mp->m_sinoalign = 0;

}



/*

 * Check that the data (and log if separate) are an ok size.

 */

STATIC int

xfs_check_sizes(xfs_mount_t *mp, int mfsi_flags)

{

	xfs_buf_t	*bp;

	xfs_daddr_t	d;

	int		error;



	d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);

	if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {

		cmn_err(CE_WARN, "XFS: size check 1 failed");

		error = XFS_ERROR(E2BIG);

		goto error1;

		return XFS_ERROR(E2BIG);

	}

	error = xfs_read_buf(mp, mp->m_ddev_targp,

			     d - XFS_FSS_TO_BB(mp, 1),
@@ -952,10 +914,9 @@ xfs_mountfs( 
		xfs_buf_relse(bp);

	} else {

		cmn_err(CE_WARN, "XFS: size check 2 failed");

		if (error == ENOSPC) {

		if (error == ENOSPC)

			error = XFS_ERROR(E2BIG);

		}

		goto error1;

		return error;

	}



	if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
@@ -963,8 +924,7 @@ xfs_mountfs( 
		d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);

		if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {

			cmn_err(CE_WARN, "XFS: size check 3 failed");

			error = XFS_ERROR(E2BIG);

			goto error1;

			return XFS_ERROR(E2BIG);

		}

		error = xfs_read_buf(mp, mp->m_logdev_targp,

				     d - XFS_FSB_TO_BB(mp, 1),
@@ -973,17 +933,111 @@ xfs_mountfs( 
			xfs_buf_relse(bp);

		} else {

			cmn_err(CE_WARN, "XFS: size check 3 failed");

			if (error == ENOSPC) {

			if (error == ENOSPC)

				error = XFS_ERROR(E2BIG);

			return error;

		}

	}

	return 0;

}



/*

 * xfs_mountfs

 *

 * This function does the following on an initial mount of a file system:

 *	- reads the superblock from disk and init the mount struct

 *	- if we're a 32-bit kernel, do a size check on the superblock

 *		so we don't mount terabyte filesystems

 *	- init mount struct realtime fields

 *	- allocate inode hash table for fs

 *	- init directory manager

 *	- perform recovery and init the log manager

 */

int

xfs_mountfs(

	xfs_mount_t	*mp,

	int		mfsi_flags)

{

	xfs_sb_t	*sbp = &(mp->m_sb);

	xfs_inode_t	*rip;

	bhv_vnode_t	*rvp = NULL;

	__uint64_t	resblks;

	__int64_t	update_flags = 0LL;

	uint		quotamount, quotaflags;

	int		agno;

	int		uuid_mounted = 0;

	int		error = 0;



	if (mp->m_sb_bp == NULL) {

		error = xfs_readsb(mp, mfsi_flags);

		if (error)

			return error;

	}

	xfs_mount_common(mp, sbp);



	/*

	 * Check if sb_agblocks is aligned at stripe boundary

	 * If sb_agblocks is NOT aligned turn off m_dalign since

	 * allocator alignment is within an ag, therefore ag has

	 * to be aligned at stripe boundary.

	 */

	error = xfs_update_alignment(mp, mfsi_flags, &update_flags);

	if (error)

		goto error1;



	xfs_alloc_compute_maxlevels(mp);

	xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);

	xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);

	xfs_ialloc_compute_maxlevels(mp);



	xfs_set_maxicount(mp);



	mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);



	/*

	 * XFS uses the uuid from the superblock as the unique

	 * identifier for fsid.  We can not use the uuid from the volume

	 * since a single partition filesystem is identical to a single

	 * partition volume/filesystem.

	 */

	if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&

	    (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {

		if (xfs_uuid_mount(mp)) {

			error = XFS_ERROR(EINVAL);

			goto error1;

		}

		uuid_mounted=1;

	}



	/*

	 * Set the minimum read and write sizes

	 */

	xfs_set_rw_sizes(mp);



	/*

	 * Set the inode cluster size.

	 * This may still be overridden by the file system

	 * block size if it is larger than the chosen cluster size.

	 */

	mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;



	/*

	 * Set inode alignment fields

	 */

	xfs_set_inoalignment(mp);



	/*

	 * Check that the data (and log if separate) are an ok size.

	 */

	error = xfs_check_sizes(mp, mfsi_flags);

	if (error)

		goto error1;



	/*

	 * Initialize realtime fields in the mount structure

	 */

	if ((error = xfs_rtmount_init(mp))) {

	error = xfs_rtmount_init(mp);

	if (error) {

		cmn_err(CE_WARN, "XFS: RT mount failed");

		goto error1;

	}
@@ -1101,7 +1155,8 @@ xfs_mountfs( 
	/*

	 * Initialize realtime inode pointers in the mount structure

	 */

	if ((error = xfs_rtmount_inodes(mp))) {

	error = xfs_rtmount_inodes(mp);

	if (error) {

		/*

		 * Free up the root inode.

		 */
@@ -1119,7 +1174,8 @@ xfs_mountfs( 
	/*

	 * Initialise the XFS quota management subsystem for this mount

	 */

	if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))

	error = XFS_QM_INIT(mp, &quotamount, &quotaflags);

	if (error)

		goto error4;



	/*
@@ -1136,7 +1192,8 @@ xfs_mountfs( 
	/*

	 * Complete the quota initialisation, post-log-replay component.

	 */

	if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))

	error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags);

	if (error)

		goto error4;



	/*

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