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Commit 60c7b4df authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for-linus-v3.7-rc1' of git://oss.sgi.com/xfs/xfs 

Pull xfs update from Ben Myers:
 "Several enhancements and cleanups:

   - make inode32 and inode64 remountable options
   - SEEK_HOLE/SEEK_DATA enhancements
   - cleanup struct declarations in xfs_mount.h"

* tag 'for-linus-v3.7-rc1' of git://oss.sgi.com/xfs/xfs:
  xfs: Make inode32 a remountable option
  xfs: add inode64->inode32 transition into xfs_set_inode32()
  xfs: Fix mp->m_maxagi update during inode64 remount
  xfs: reduce code duplication handling inode32/64 options
  xfs: make inode64 as the default allocation mode
  xfs: Fix m_agirotor reset during AG selection
  Make inode64 a remountable option
  xfs: stop the sync worker before xfs_unmountfs
  xfs: xfs_seek_hole() refinement with hole searching from page cache for unwritten extents
  xfs: xfs_seek_data() refinement with unwritten extents check up from page cache
  xfs: Introduce a helper routine to probe data or hole offset from page cache
  xfs: Remove type argument from xfs_seek_data()/xfs_seek_hole()
  xfs: fix race while discarding buffers [V4]
  xfs: check for possible overflow in xfs_ioc_trim
  xfs: unlock the AGI buffer when looping in xfs_dialloc
  xfs: kill struct declarations in xfs_mount.h
  xfs: fix uninitialised variable in xfs_rtbuf_get()
parents aab174f0 2ea03929

fs/xfs/xfs_file.c

+344 −35
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 


#include <linux/dcache.h>

#include <linux/falloc.h>

#include <linux/pagevec.h>



static const struct vm_operations_struct xfs_file_vm_ops;
@@ -959,17 +960,232 @@ xfs_vm_page_mkwrite( 
	return block_page_mkwrite(vma, vmf, xfs_get_blocks);

}



/*

 * This type is designed to indicate the type of offset we would like

 * to search from page cache for either xfs_seek_data() or xfs_seek_hole().

 */

enum {

	HOLE_OFF = 0,

	DATA_OFF,

};



/*

 * Lookup the desired type of offset from the given page.

 *

 * On success, return true and the offset argument will point to the

 * start of the region that was found.  Otherwise this function will

 * return false and keep the offset argument unchanged.

 */

STATIC bool

xfs_lookup_buffer_offset(

	struct page		*page,

	loff_t			*offset,

	unsigned int		type)

{

	loff_t			lastoff = page_offset(page);

	bool			found = false;

	struct buffer_head	*bh, *head;



	bh = head = page_buffers(page);

	do {

		/*

		 * Unwritten extents that have data in the page

		 * cache covering them can be identified by the

		 * BH_Unwritten state flag.  Pages with multiple

		 * buffers might have a mix of holes, data and

		 * unwritten extents - any buffer with valid

		 * data in it should have BH_Uptodate flag set

		 * on it.

		 */

		if (buffer_unwritten(bh) ||

		    buffer_uptodate(bh)) {

			if (type == DATA_OFF)

				found = true;

		} else {

			if (type == HOLE_OFF)

				found = true;

		}



		if (found) {

			*offset = lastoff;

			break;

		}

		lastoff += bh->b_size;

	} while ((bh = bh->b_this_page) != head);



	return found;

}



/*

 * This routine is called to find out and return a data or hole offset

 * from the page cache for unwritten extents according to the desired

 * type for xfs_seek_data() or xfs_seek_hole().

 *

 * The argument offset is used to tell where we start to search from the

 * page cache.  Map is used to figure out the end points of the range to

 * lookup pages.

 *

 * Return true if the desired type of offset was found, and the argument

 * offset is filled with that address.  Otherwise, return false and keep

 * offset unchanged.

 */

STATIC bool

xfs_find_get_desired_pgoff(

	struct inode		*inode,

	struct xfs_bmbt_irec	*map,

	unsigned int		type,

	loff_t			*offset)

{

	struct xfs_inode	*ip = XFS_I(inode);

	struct xfs_mount	*mp = ip->i_mount;

	struct pagevec		pvec;

	pgoff_t			index;

	pgoff_t			end;

	loff_t			endoff;

	loff_t			startoff = *offset;

	loff_t			lastoff = startoff;

	bool			found = false;



	pagevec_init(&pvec, 0);



	index = startoff >> PAGE_CACHE_SHIFT;

	endoff = XFS_FSB_TO_B(mp, map->br_startoff + map->br_blockcount);

	end = endoff >> PAGE_CACHE_SHIFT;

	do {

		int		want;

		unsigned	nr_pages;

		unsigned int	i;



		want = min_t(pgoff_t, end - index, PAGEVEC_SIZE);

		nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,

					  want);

		/*

		 * No page mapped into given range.  If we are searching holes

		 * and if this is the first time we got into the loop, it means

		 * that the given offset is landed in a hole, return it.

		 *

		 * If we have already stepped through some block buffers to find

		 * holes but they all contains data.  In this case, the last

		 * offset is already updated and pointed to the end of the last

		 * mapped page, if it does not reach the endpoint to search,

		 * that means there should be a hole between them.

		 */

		if (nr_pages == 0) {

			/* Data search found nothing */

			if (type == DATA_OFF)

				break;



			ASSERT(type == HOLE_OFF);

			if (lastoff == startoff || lastoff < endoff) {

				found = true;

				*offset = lastoff;

			}

			break;

		}



		/*

		 * At lease we found one page.  If this is the first time we

		 * step into the loop, and if the first page index offset is

		 * greater than the given search offset, a hole was found.

		 */

		if (type == HOLE_OFF && lastoff == startoff &&

		    lastoff < page_offset(pvec.pages[0])) {

			found = true;

			break;

		}



		for (i = 0; i < nr_pages; i++) {

			struct page	*page = pvec.pages[i];

			loff_t		b_offset;



			/*

			 * At this point, the page may be truncated or

			 * invalidated (changing page->mapping to NULL),

			 * or even swizzled back from swapper_space to tmpfs

			 * file mapping. However, page->index will not change

			 * because we have a reference on the page.

			 *

			 * Searching done if the page index is out of range.

			 * If the current offset is not reaches the end of

			 * the specified search range, there should be a hole

			 * between them.

			 */

			if (page->index > end) {

				if (type == HOLE_OFF && lastoff < endoff) {

					*offset = lastoff;

					found = true;

				}

				goto out;

			}



			lock_page(page);

			/*

			 * Page truncated or invalidated(page->mapping == NULL).

			 * We can freely skip it and proceed to check the next

			 * page.

			 */

			if (unlikely(page->mapping != inode->i_mapping)) {

				unlock_page(page);

				continue;

			}



			if (!page_has_buffers(page)) {

				unlock_page(page);

				continue;

			}



			found = xfs_lookup_buffer_offset(page, &b_offset, type);

			if (found) {

				/*

				 * The found offset may be less than the start

				 * point to search if this is the first time to

				 * come here.

				 */

				*offset = max_t(loff_t, startoff, b_offset);

				unlock_page(page);

				goto out;

			}



			/*

			 * We either searching data but nothing was found, or

			 * searching hole but found a data buffer.  In either

			 * case, probably the next page contains the desired

			 * things, update the last offset to it so.

			 */

			lastoff = page_offset(page) + PAGE_SIZE;

			unlock_page(page);

		}



		/*

		 * The number of returned pages less than our desired, search

		 * done.  In this case, nothing was found for searching data,

		 * but we found a hole behind the last offset.

		 */

		if (nr_pages < want) {

			if (type == HOLE_OFF) {

				*offset = lastoff;

				found = true;

			}

			break;

		}



		index = pvec.pages[i - 1]->index + 1;

		pagevec_release(&pvec);

	} while (index <= end);



out:

	pagevec_release(&pvec);

	return found;

}



STATIC loff_t

xfs_seek_data(

	struct file		*file,

	loff_t			start,

	u32			type)

	loff_t			start)

{

	struct inode		*inode = file->f_mapping->host;

	struct xfs_inode	*ip = XFS_I(inode);

	struct xfs_mount	*mp = ip->i_mount;

	struct xfs_bmbt_irec	map[2];

	int			nmap = 2;

	loff_t			uninitialized_var(offset);

	xfs_fsize_t		isize;

	xfs_fileoff_t		fsbno;
@@ -985,36 +1201,74 @@ xfs_seek_data( 
		goto out_unlock;

	}



	fsbno = XFS_B_TO_FSBT(mp, start);



	/*

	 * Try to read extents from the first block indicated

	 * by fsbno to the end block of the file.

	 */

	fsbno = XFS_B_TO_FSBT(mp, start);

	end = XFS_B_TO_FSB(mp, isize);

	for (;;) {

		struct xfs_bmbt_irec	map[2];

		int			nmap = 2;

		unsigned int		i;



		error = xfs_bmapi_read(ip, fsbno, end - fsbno, map, &nmap,

				       XFS_BMAPI_ENTIRE);

		if (error)

			goto out_unlock;



		/* No extents at given offset, must be beyond EOF */

		if (nmap == 0) {

			error = ENXIO;

			goto out_unlock;

		}



		for (i = 0; i < nmap; i++) {

			offset = max_t(loff_t, start,

				       XFS_FSB_TO_B(mp, map[i].br_startoff));



			/* Landed in a data extent */

			if (map[i].br_startblock == DELAYSTARTBLOCK ||

			    (map[i].br_state == XFS_EXT_NORM &&

			     !isnullstartblock(map[i].br_startblock)))

				goto out;



			/*

	 * Treat unwritten extent as data extent since it might

	 * contains dirty data in page cache.

			 * Landed in an unwritten extent, try to search data

			 * from page cache.

			 */

			if (map[i].br_state == XFS_EXT_UNWRITTEN) {

				if (xfs_find_get_desired_pgoff(inode, &map[i],

							DATA_OFF, &offset))

					goto out;

			}

		}



		/*

		 * map[0] is hole or its an unwritten extent but

		 * without data in page cache.  Probably means that

		 * we are reading after EOF if nothing in map[1].

		 */

	if (map[0].br_startblock != HOLESTARTBLOCK) {

		offset = max_t(loff_t, start,

			       XFS_FSB_TO_B(mp, map[0].br_startoff));

	} else {

		if (nmap == 1) {

			error = ENXIO;

			goto out_unlock;

		}



		offset = max_t(loff_t, start,

			       XFS_FSB_TO_B(mp, map[1].br_startoff));

		ASSERT(i > 1);



		/*

		 * Nothing was found, proceed to the next round of search

		 * if reading offset not beyond or hit EOF.

		 */

		fsbno = map[i - 1].br_startoff + map[i - 1].br_blockcount;

		start = XFS_FSB_TO_B(mp, fsbno);

		if (start >= isize) {

			error = ENXIO;

			goto out_unlock;

		}

	}



out:

	if (offset != file->f_pos)

		file->f_pos = offset;
@@ -1029,16 +1283,15 @@ out_unlock: 
STATIC loff_t

xfs_seek_hole(

	struct file		*file,

	loff_t			start,

	u32			type)

	loff_t			start)

{

	struct inode		*inode = file->f_mapping->host;

	struct xfs_inode	*ip = XFS_I(inode);

	struct xfs_mount	*mp = ip->i_mount;

	loff_t			uninitialized_var(offset);

	loff_t			holeoff;

	xfs_fsize_t		isize;

	xfs_fileoff_t		fsbno;

	xfs_filblks_t		end;

	uint			lock;

	int			error;
@@ -1054,21 +1307,77 @@ xfs_seek_hole( 
	}



	fsbno = XFS_B_TO_FSBT(mp, start);

	error = xfs_bmap_first_unused(NULL, ip, 1, &fsbno, XFS_DATA_FORK);

	end = XFS_B_TO_FSB(mp, isize);



	for (;;) {

		struct xfs_bmbt_irec	map[2];

		int			nmap = 2;

		unsigned int		i;



		error = xfs_bmapi_read(ip, fsbno, end - fsbno, map, &nmap,

				       XFS_BMAPI_ENTIRE);

		if (error)

			goto out_unlock;



	holeoff = XFS_FSB_TO_B(mp, fsbno);

	if (holeoff <= start)

		offset = start;

	else {

		/* No extents at given offset, must be beyond EOF */

		if (nmap == 0) {

			error = ENXIO;

			goto out_unlock;

		}



		for (i = 0; i < nmap; i++) {

			offset = max_t(loff_t, start,

				       XFS_FSB_TO_B(mp, map[i].br_startoff));



			/* Landed in a hole */

			if (map[i].br_startblock == HOLESTARTBLOCK)

				goto out;



			/*

		 * xfs_bmap_first_unused() could return a value bigger than

		 * isize if there are no more holes past the supplied offset.

			 * Landed in an unwritten extent, try to search hole

			 * from page cache.

			 */

		offset = min_t(loff_t, holeoff, isize);

			if (map[i].br_state == XFS_EXT_UNWRITTEN) {

				if (xfs_find_get_desired_pgoff(inode, &map[i],

							HOLE_OFF, &offset))

					goto out;

			}

		}



		/*

		 * map[0] contains data or its unwritten but contains

		 * data in page cache, probably means that we are

		 * reading after EOF.  We should fix offset to point

		 * to the end of the file(i.e., there is an implicit

		 * hole at the end of any file).

		 */

		if (nmap == 1) {

			offset = isize;

			break;

		}



		ASSERT(i > 1);



		/*

		 * Both mappings contains data, proceed to the next round of

		 * search if the current reading offset not beyond or hit EOF.

		 */

		fsbno = map[i - 1].br_startoff + map[i - 1].br_blockcount;

		start = XFS_FSB_TO_B(mp, fsbno);

		if (start >= isize) {

			offset = isize;

			break;

		}

	}



out:

	/*

	 * At this point, we must have found a hole.  However, the returned

	 * offset may be bigger than the file size as it may be aligned to

	 * page boundary for unwritten extents, we need to deal with this

	 * situation in particular.

	 */

	offset = min_t(loff_t, offset, isize);

	if (offset != file->f_pos)

		file->f_pos = offset;
@@ -1092,9 +1401,9 @@ xfs_file_llseek( 
	case SEEK_SET:

		return generic_file_llseek(file, offset, origin);

	case SEEK_DATA:

		return xfs_seek_data(file, offset, origin);

		return xfs_seek_data(file, offset);

	case SEEK_HOLE:

		return xfs_seek_hole(file, offset, origin);

		return xfs_seek_hole(file, offset);

	default:

		return -EINVAL;

	}

fs/xfs/xfs_ialloc.c

+1 −1
Original line number Diff line number Diff line
@@ -431,7 +431,7 @@ xfs_ialloc_next_ag( 


	spin_lock(&mp->m_agirotor_lock);

	agno = mp->m_agirotor;

	if (++mp->m_agirotor == mp->m_maxagi)

	if (++mp->m_agirotor >= mp->m_maxagi)

		mp->m_agirotor = 0;

	spin_unlock(&mp->m_agirotor_lock);

fs/xfs/xfs_mount.c

+5 −38
Original line number Diff line number Diff line
@@ -440,7 +440,7 @@ xfs_initialize_perag( 
	xfs_agnumber_t	agcount,

	xfs_agnumber_t	*maxagi)

{

	xfs_agnumber_t	index, max_metadata;

	xfs_agnumber_t	index;

	xfs_agnumber_t	first_initialised = 0;

	xfs_perag_t	*pag;

	xfs_agino_t	agino;
@@ -500,43 +500,10 @@ xfs_initialize_perag( 
	else

		mp->m_flags &= ~XFS_MOUNT_32BITINODES;



	if (mp->m_flags & XFS_MOUNT_32BITINODES) {

		/*

		 * Calculate how much should be reserved for inodes to meet

		 * the max inode percentage.

		 */

		if (mp->m_maxicount) {

			__uint64_t	icount;



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

			do_div(icount, 100);

			icount += sbp->sb_agblocks - 1;

			do_div(icount, sbp->sb_agblocks);

			max_metadata = icount;

		} else {

			max_metadata = agcount;

		}



		for (index = 0; index < agcount; index++) {

			ino = XFS_AGINO_TO_INO(mp, index, agino);

			if (ino > XFS_MAXINUMBER_32) {

				index++;

				break;

			}



			pag = xfs_perag_get(mp, index);

			pag->pagi_inodeok = 1;

			if (index < max_metadata)

				pag->pagf_metadata = 1;

			xfs_perag_put(pag);

		}

	} else {

		for (index = 0; index < agcount; index++) {

			pag = xfs_perag_get(mp, index);

			pag->pagi_inodeok = 1;

			xfs_perag_put(pag);

		}

	}

	if (mp->m_flags & XFS_MOUNT_32BITINODES)

		index = xfs_set_inode32(mp);

	else

		index = xfs_set_inode64(mp);



	if (maxagi)

		*maxagi = index;

fs/xfs/xfs_mount.h

+0 −5
Original line number Diff line number Diff line
@@ -54,12 +54,7 @@ typedef struct xfs_trans_reservations { 
#include "xfs_sync.h"



struct xlog;

struct xfs_mount_args;

struct xfs_inode;

struct xfs_bmbt_irec;

struct xfs_bmap_free;

struct xfs_extdelta;

struct xfs_swapext;

struct xfs_mru_cache;

struct xfs_nameops;

struct xfs_ail;

fs/xfs/xfs_super.c

+94 −1
Original line number Diff line number Diff line
@@ -88,6 +88,8 @@ mempool_t *xfs_ioend_pool; 
					 * unwritten extent conversion */

#define MNTOPT_NOBARRIER "nobarrier"	/* .. disable */

#define MNTOPT_64BITINODE   "inode64"	/* inodes can be allocated anywhere */

#define MNTOPT_32BITINODE   "inode32"	/* inode allocation limited to

					 * XFS_MAXINUMBER_32 */

#define MNTOPT_IKEEP	"ikeep"		/* do not free empty inode clusters */

#define MNTOPT_NOIKEEP	"noikeep"	/* free empty inode clusters */

#define MNTOPT_LARGEIO	   "largeio"	/* report large I/O sizes in stat() */
@@ -120,12 +122,18 @@ mempool_t *xfs_ioend_pool; 
 * in the future, too.

 */

enum {

	Opt_barrier, Opt_nobarrier, Opt_err

	Opt_barrier,

	Opt_nobarrier,

	Opt_inode64,

	Opt_inode32,

	Opt_err

};



static const match_table_t tokens = {

	{Opt_barrier, "barrier"},

	{Opt_nobarrier, "nobarrier"},

	{Opt_inode64, "inode64"},

	{Opt_inode32, "inode32"},

	{Opt_err, NULL}

};
@@ -197,7 +205,9 @@ xfs_parseargs( 
	 */

	mp->m_flags |= XFS_MOUNT_BARRIER;

	mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;

#if !XFS_BIG_INUMS

	mp->m_flags |= XFS_MOUNT_SMALL_INUMS;

#endif



	/*

	 * These can be overridden by the mount option parsing.
@@ -294,6 +304,8 @@ xfs_parseargs( 
				return EINVAL;

			}

			dswidth = simple_strtoul(value, &eov, 10);

		} else if (!strcmp(this_char, MNTOPT_32BITINODE)) {

			mp->m_flags |= XFS_MOUNT_SMALL_INUMS;

		} else if (!strcmp(this_char, MNTOPT_64BITINODE)) {

			mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;

#if !XFS_BIG_INUMS
@@ -492,6 +504,7 @@ xfs_showargs( 
		{ XFS_MOUNT_FILESTREAMS,	"," MNTOPT_FILESTREAM },

		{ XFS_MOUNT_GRPID,		"," MNTOPT_GRPID },

		{ XFS_MOUNT_DISCARD,		"," MNTOPT_DISCARD },

		{ XFS_MOUNT_SMALL_INUMS,	"," MNTOPT_32BITINODE },

		{ 0, NULL }

	};

	static struct proc_xfs_info xfs_info_unset[] = {
@@ -591,6 +604,80 @@ xfs_max_file_offset( 
	return (((__uint64_t)pagefactor) << bitshift) - 1;

}



xfs_agnumber_t

xfs_set_inode32(struct xfs_mount *mp)

{

	xfs_agnumber_t	index = 0;

	xfs_agnumber_t	maxagi = 0;

	xfs_sb_t	*sbp = &mp->m_sb;

	xfs_agnumber_t	max_metadata;

	xfs_agino_t	agino =	XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks -1, 0);

	xfs_ino_t	ino = XFS_AGINO_TO_INO(mp, sbp->sb_agcount -1, agino);

	xfs_perag_t	*pag;



	/* Calculate how much should be reserved for inodes to meet

	 * the max inode percentage.

	 */

	if (mp->m_maxicount) {

		__uint64_t	icount;



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

		do_div(icount, 100);

		icount += sbp->sb_agblocks - 1;

		do_div(icount, sbp->sb_agblocks);

		max_metadata = icount;

	} else {

		max_metadata = sbp->sb_agcount;

	}



	for (index = 0; index < sbp->sb_agcount; index++) {

		ino = XFS_AGINO_TO_INO(mp, index, agino);



		if (ino > XFS_MAXINUMBER_32) {

			pag = xfs_perag_get(mp, index);

			pag->pagi_inodeok = 0;

			pag->pagf_metadata = 0;

			xfs_perag_put(pag);

			continue;

		}



		pag = xfs_perag_get(mp, index);

		pag->pagi_inodeok = 1;

		maxagi++;

		if (index < max_metadata)

			pag->pagf_metadata = 1;

		xfs_perag_put(pag);

	}

	mp->m_flags |= (XFS_MOUNT_32BITINODES |

			XFS_MOUNT_SMALL_INUMS);



	return maxagi;

}



xfs_agnumber_t

xfs_set_inode64(struct xfs_mount *mp)

{

	xfs_agnumber_t index = 0;



	for (index = 0; index < mp->m_sb.sb_agcount; index++) {

		struct xfs_perag	*pag;



		pag = xfs_perag_get(mp, index);

		pag->pagi_inodeok = 1;

		pag->pagf_metadata = 0;

		xfs_perag_put(pag);

	}



	/* There is no need for lock protection on m_flags,

	 * the rw_semaphore of the VFS superblock is locked

	 * during mount/umount/remount operations, so this is

	 * enough to avoid concurency on the m_flags field

	 */

	mp->m_flags &= ~(XFS_MOUNT_32BITINODES |

			 XFS_MOUNT_SMALL_INUMS);

	return index;

}



STATIC int

xfs_blkdev_get(

	xfs_mount_t		*mp,
@@ -1056,6 +1143,12 @@ xfs_fs_remount( 
		case Opt_nobarrier:

			mp->m_flags &= ~XFS_MOUNT_BARRIER;

			break;

		case Opt_inode64:

			mp->m_maxagi = xfs_set_inode64(mp);

			break;

		case Opt_inode32:

			mp->m_maxagi = xfs_set_inode32(mp);

			break;

		default:

			/*

			 * Logically we would return an error here to prevent