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/*

 * Copyright (c) 2000-2004 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_fs.h"

#include "xfs_inum.h"

#include "xfs_log.h"

#include "xfs_trans.h"

#include "xfs_sb.h"

#include "xfs_ag.h"

#include "xfs_dir.h"

#include "xfs_dir2.h"

#include "xfs_alloc.h"

#include "xfs_dmapi.h"

#include "xfs_quota.h"

#include "xfs_mount.h"

#include "xfs_alloc_btree.h"

#include "xfs_bmap_btree.h"

#include "xfs_ialloc_btree.h"

#include "xfs_btree.h"

#include "xfs_ialloc.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_bmap.h"

#include "xfs_bit.h"

#include "xfs_rtalloc.h"

#include "xfs_error.h"

#include "xfs_itable.h"

#include "xfs_rw.h"

#include "xfs_acl.h"

#include "xfs_cap.h"

#include "xfs_mac.h"

#include "xfs_attr.h"

#include "xfs_buf_item.h"

#include "xfs_trans_space.h"

#include "xfs_utils.h"

#include "xfs_iomap.h"

#if defined(XFS_RW_TRACE)

void

xfs_iomap_enter_trace(

        int             tag,

        xfs_iocore_t    *io,

        xfs_off_t       offset,

        ssize_t         count)

{

        xfs_inode_t     *ip = XFS_IO_INODE(io);

        if (!ip->i_rwtrace)

                return;

        ktrace_enter(ip->i_rwtrace,

                (void *)((unsigned long)tag),

                (void *)ip,

                (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),

                (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),

                (void *)((unsigned long)((offset >> 32) & 0xffffffff)),

                (void *)((unsigned long)(offset & 0xffffffff)),

                (void *)((unsigned long)count),

                (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),

                (void *)((unsigned long)(io->io_new_size & 0xffffffff)),

                (void *)NULL,

                (void *)NULL,

                (void *)NULL,

                (void *)NULL,

                (void *)NULL,

                (void *)NULL,

                (void *)NULL);

}

void

xfs_iomap_map_trace(

        int             tag,

        xfs_iocore_t    *io,

        xfs_off_t       offset,

        ssize_t         count,

        xfs_iomap_t     *iomapp,

        xfs_bmbt_irec_t *imapp,

        int             flags)

{

        xfs_inode_t     *ip = XFS_IO_INODE(io);

        if (!ip->i_rwtrace)

                return;

        ktrace_enter(ip->i_rwtrace,

                (void *)((unsigned long)tag),

                (void *)ip,

                (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),

                (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),

                (void *)((unsigned long)((offset >> 32) & 0xffffffff)),

                (void *)((unsigned long)(offset & 0xffffffff)),

                (void *)((unsigned long)count),

                (void *)((unsigned long)flags),

                (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),

                (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),

                (void *)((unsigned long)(iomapp->iomap_delta)),

                (void *)((unsigned long)(iomapp->iomap_bsize)),

                (void *)((unsigned long)(iomapp->iomap_bn)),

                (void *)(__psint_t)(imapp->br_startoff),

                (void *)((unsigned long)(imapp->br_blockcount)),

                (void *)(__psint_t)(imapp->br_startblock));

}

#else

#define xfs_iomap_enter_trace(tag, io, offset, count)

#define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)

#endif

#define XFS_WRITEIO_ALIGN(mp,off)       (((off) >> mp->m_writeio_log) \

                                                << mp->m_writeio_log)

#define XFS_STRAT_WRITE_IMAPS   2

#define XFS_WRITE_IMAPS         XFS_BMAP_MAX_NMAP

STATIC int

xfs_imap_to_bmap(

        xfs_iocore_t    *io,

        xfs_off_t       offset,

        xfs_bmbt_irec_t *imap,

        xfs_iomap_t     *iomapp,

        int             imaps,                  /* Number of imap entries */

        int             iomaps,                 /* Number of iomap entries */

        int             flags)

{

        xfs_mount_t     *mp;

        xfs_fsize_t     nisize;

        int             pbm;

        xfs_fsblock_t   start_block;

        mp = io->io_mount;

        nisize = XFS_SIZE(mp, io);

        if (io->io_new_size > nisize)

                nisize = io->io_new_size;

        for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {

                iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?

                        mp->m_rtdev_targp : mp->m_ddev_targp;

                iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);

                iomapp->iomap_delta = offset - iomapp->iomap_offset;

                iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);

                iomapp->iomap_flags = flags;

                start_block = imap->br_startblock;

                if (start_block == HOLESTARTBLOCK) {

                        iomapp->iomap_bn = IOMAP_DADDR_NULL;

                        iomapp->iomap_flags = IOMAP_HOLE;

                } else if (start_block == DELAYSTARTBLOCK) {

                        iomapp->iomap_bn = IOMAP_DADDR_NULL;

                        iomapp->iomap_flags = IOMAP_DELAY;

                } else {

                        iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block);

                        if (ISUNWRITTEN(imap))

                                iomapp->iomap_flags |= IOMAP_UNWRITTEN;

                }

                if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) {

                        iomapp->iomap_flags |= IOMAP_EOF;

                }

                offset += iomapp->iomap_bsize - iomapp->iomap_delta;

        }

        return pbm;     /* Return the number filled */

}

int

xfs_iomap(

        xfs_iocore_t    *io,

        xfs_off_t       offset,

        ssize_t         count,

        int             flags,

        xfs_iomap_t     *iomapp,

        int             *niomaps)

{

        xfs_mount_t     *mp = io->io_mount;

        xfs_fileoff_t   offset_fsb, end_fsb;

        int             error = 0;

        int             lockmode = 0;

        xfs_bmbt_irec_t imap;

        int             nimaps = 1;

        int             bmapi_flags = 0;

        int             iomap_flags = 0;

        if (XFS_FORCED_SHUTDOWN(mp))

                return XFS_ERROR(EIO);

        switch (flags &

                (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE |

                 BMAPI_UNWRITTEN | BMAPI_DEVICE)) {

        case BMAPI_READ:

                xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);

                lockmode = XFS_LCK_MAP_SHARED(mp, io);

                bmapi_flags = XFS_BMAPI_ENTIRE;

                if (flags & BMAPI_IGNSTATE)

                        bmapi_flags |= XFS_BMAPI_IGSTATE;

                break;

        case BMAPI_WRITE:

                xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);

                lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;

                bmapi_flags = 0;

                XFS_ILOCK(mp, io, lockmode);

                break;

        case BMAPI_ALLOCATE:

                xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);

                lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;

                bmapi_flags = XFS_BMAPI_ENTIRE;

                /* Attempt non-blocking lock */

                if (flags & BMAPI_TRYLOCK) {

                        if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))

                                return XFS_ERROR(EAGAIN);

                } else {

                        XFS_ILOCK(mp, io, lockmode);

                }

                break;

        case BMAPI_UNWRITTEN:

                goto phase2;

        case BMAPI_DEVICE:

                lockmode = XFS_LCK_MAP_SHARED(mp, io);

                iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?

                        mp->m_rtdev_targp : mp->m_ddev_targp;

                error = 0;

                *niomaps = 1;

                goto out;

        default:

                BUG();

        }

        ASSERT(offset <= mp->m_maxioffset);

        if ((xfs_fsize_t)offset + count > mp->m_maxioffset)

                count = mp->m_maxioffset - offset;

        end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);

        offset_fsb = XFS_B_TO_FSBT(mp, offset);

        error = XFS_BMAPI(mp, NULL, io, offset_fsb,

                        (xfs_filblks_t)(end_fsb - offset_fsb),

                        bmapi_flags,  NULL, 0, &imap,

                        &nimaps, NULL);

        if (error)

                goto out;

phase2:

        switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {

        case BMAPI_WRITE:

                /* If we found an extent, return it */

                if (nimaps && (imap.br_startblock != HOLESTARTBLOCK)) {

                        xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,

                                        offset, count, iomapp, &imap, flags);

                        break;

                }

                if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {

                        error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,

                                        count, flags, &imap, &nimaps, nimaps);

                } else {

                        error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,

                                        flags, &imap, &nimaps);

                }

                if (!error) {

                        xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,

                                        offset, count, iomapp, &imap, flags);

                }

                iomap_flags = IOMAP_NEW;

                break;

        case BMAPI_ALLOCATE:

                /* If we found an extent, return it */

                XFS_IUNLOCK(mp, io, lockmode);

                lockmode = 0;

                if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {

                        xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,

                                        offset, count, iomapp, &imap, flags);

                        break;

                }

                error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, &imap, &nimaps);

                break;

        case BMAPI_UNWRITTEN:

                lockmode = 0;

                error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);

                nimaps = 0;

                break;

        }

        if (nimaps) {

                *niomaps = xfs_imap_to_bmap(io, offset, &imap,

                                            iomapp, nimaps, *niomaps, iomap_flags);

        } else if (niomaps) {

                *niomaps = 0;

        }

out:

        if (lockmode)

                XFS_IUNLOCK(mp, io, lockmode);

        return XFS_ERROR(error);

}

STATIC int

xfs_flush_space(

        xfs_inode_t     *ip,

        int             *fsynced,

        int             *ioflags)

{

        switch (*fsynced) {

        case 0:

                if (ip->i_delayed_blks) {

                        xfs_iunlock(ip, XFS_ILOCK_EXCL);

                        xfs_flush_inode(ip);

                        xfs_ilock(ip, XFS_ILOCK_EXCL);

                        *fsynced = 1;

                } else {

                        *ioflags |= BMAPI_SYNC;

                        *fsynced = 2;

                }

                return 0;

        case 1:

                *fsynced = 2;

                *ioflags |= BMAPI_SYNC;

                return 0;

        case 2:

                xfs_iunlock(ip, XFS_ILOCK_EXCL);

                xfs_flush_device(ip);

                xfs_ilock(ip, XFS_ILOCK_EXCL);

                *fsynced = 3;

                return 0;

        }

        return 1;

}

int

xfs_iomap_write_direct(

        xfs_inode_t     *ip,

        loff_t          offset,

        size_t          count,

        int             flags,

        xfs_bmbt_irec_t *ret_imap,

        int             *nmaps,

        int             found)

{

        xfs_mount_t     *mp = ip->i_mount;

        xfs_iocore_t    *io = &ip->i_iocore;

        xfs_fileoff_t   offset_fsb;

        xfs_fileoff_t   last_fsb;

        xfs_filblks_t   count_fsb;

        xfs_fsize_t     isize;

        xfs_fsblock_t   firstfsb;

        int             nimaps, maps;

        int             error;

        int             bmapi_flag;

        int             rt;

        xfs_trans_t     *tp;

        xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp;

        xfs_bmap_free_t free_list;

        int             aeof;

        xfs_filblks_t   datablocks;

        int             committed;

        int             numrtextents;

        uint            resblks;

        /*

         * Make sure that the dquots are there. This doesn't hold

         * the ilock across a disk read.

         */

        error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);

        if (error)

                return XFS_ERROR(error);

        maps = min(XFS_WRITE_IMAPS, *nmaps);

        nimaps = maps;

        isize = ip->i_d.di_size;

        aeof = (offset + count) > isize;

        if (io->io_new_size > isize)

                isize = io->io_new_size;

        offset_fsb = XFS_B_TO_FSBT(mp, offset);

        last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));

        count_fsb = last_fsb - offset_fsb;

        if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {

                xfs_fileoff_t   map_last_fsb;

                map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;

                if (map_last_fsb < last_fsb) {

                        last_fsb = map_last_fsb;

                        count_fsb = last_fsb - offset_fsb;

                }

                ASSERT(count_fsb > 0);

        }

        /*

         * determine if reserving space on

         * the data or realtime partition.

         */

        if ((rt = XFS_IS_REALTIME_INODE(ip))) {

                int     sbrtextsize, iprtextsize;

                sbrtextsize = mp->m_sb.sb_rextsize;

                iprtextsize =

                        ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize;

                numrtextents = (count_fsb + iprtextsize - 1);

                do_div(numrtextents, sbrtextsize);

                datablocks = 0;

        } else {

                datablocks = count_fsb;

                numrtextents = 0;

        }

        /*

         * allocate and setup the transaction

         */

        xfs_iunlock(ip, XFS_ILOCK_EXCL);

        tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);

        resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks);

        error = xfs_trans_reserve(tp, resblks,

                        XFS_WRITE_LOG_RES(mp), numrtextents,

                        XFS_TRANS_PERM_LOG_RES,

                        XFS_WRITE_LOG_COUNT);

        /*

         * check for running out of space

         */

        if (error)

                /*

                 * Free the transaction structure.

                 */

                xfs_trans_cancel(tp, 0);

        xfs_ilock(ip, XFS_ILOCK_EXCL);

        if (error)

                goto error_out; /* Don't return in above if .. trans ..,

                                        need lock to return */

        if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) {

                error = (EDQUOT);

                goto error1;

        }

        nimaps = 1;

        bmapi_flag = XFS_BMAPI_WRITE;

        xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

        xfs_trans_ihold(tp, ip);

        if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))

                bmapi_flag |= XFS_BMAPI_PREALLOC;

        /*

         * issue the bmapi() call to allocate the blocks

         */

        XFS_BMAP_INIT(&free_list, &firstfsb);

        imapp = &imap[0];

        error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,

                bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list);

        if (error) {

                goto error0;

        }

        /*

         * complete the transaction

         */

        error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);

        if (error) {

                goto error0;

        }

        error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);

        if (error) {

                goto error_out;

        }

        /* copy any maps to caller's array and return any error. */

        if (nimaps == 0) {

                error = (ENOSPC);

                goto error_out;

        }

        *ret_imap = imap[0];

        *nmaps = 1;

        return 0;

 error0:        /* Cancel bmap, unlock inode, and cancel trans */

        xfs_bmap_cancel(&free_list);

 error1:        /* Just cancel transaction */

        xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);

        *nmaps = 0;      /* nothing set-up here */

error_out:

        return XFS_ERROR(error);

}

int

xfs_iomap_write_delay(

        xfs_inode_t     *ip,

        loff_t          offset,

        size_t          count,

        int             ioflag,

        xfs_bmbt_irec_t *ret_imap,

        int             *nmaps)

{

        xfs_mount_t     *mp = ip->i_mount;

        xfs_iocore_t    *io = &ip->i_iocore;

        xfs_fileoff_t   offset_fsb;

        xfs_fileoff_t   last_fsb;

        xfs_fsize_t     isize;

        xfs_fsblock_t   firstblock;

        int             nimaps;

        int             error;

        xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];

        int             aeof;

        int             fsynced = 0;

        ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);

        /*

         * Make sure that the dquots are there. This doesn't hold

         * the ilock across a disk read.

         */

        error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);

        if (error)

                return XFS_ERROR(error);

retry:

        isize = ip->i_d.di_size;

        if (io->io_new_size > isize) {

                isize = io->io_new_size;

        }

        aeof = 0;

        offset_fsb = XFS_B_TO_FSBT(mp, offset);

        last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));

        /*

         * If the caller is doing a write at the end of the file,

         * then extend the allocation (and the buffer used for the write)

         * out to the file system's write iosize.  We clean up any extra

         * space left over when the file is closed in xfs_inactive().

         *

         * We don't bother with this for sync writes, because we need

         * to minimize the amount we write for good performance.

         */

        if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {

                xfs_off_t       aligned_offset;

                unsigned int    iosize;

                xfs_fileoff_t   ioalign;

                iosize = mp->m_writeio_blocks;

                aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));

                ioalign = XFS_B_TO_FSBT(mp, aligned_offset);

                last_fsb = ioalign + iosize;

                aeof = 1;

        }

        nimaps = XFS_WRITE_IMAPS;

        firstblock = NULLFSBLOCK;

        /*

         * roundup the allocation request to m_dalign boundary if file size

         * is greater that 512K and we are allocating past the allocation eof

         */

        if (mp->m_dalign && (isize >= mp->m_dalign) && aeof) {

                int eof;

                xfs_fileoff_t new_last_fsb;

                new_last_fsb = roundup_64(last_fsb, mp->m_dalign);

                error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);

                if (error) {

                        return error;

                }

                if (eof) {

                        last_fsb = new_last_fsb;

                }

        }

        error = xfs_bmapi(NULL, ip, offset_fsb,

                          (xfs_filblks_t)(last_fsb - offset_fsb),

                          XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |

                          XFS_BMAPI_ENTIRE, &firstblock, 1, imap,

                          &nimaps, NULL);

        /*

         * This can be EDQUOT, if nimaps == 0

         */

        if (error && (error != ENOSPC)) {

                return XFS_ERROR(error);

        }

        /*

         * If bmapi returned us nothing, and if we didn't get back EDQUOT,

         * then we must have run out of space.

         */

        if (nimaps == 0) {

                xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,

                                        io, offset, count);

                if (xfs_flush_space(ip, &fsynced, &ioflag))

                        return XFS_ERROR(ENOSPC);

                error = 0;

                goto retry;

        }

        *ret_imap = imap[0];

        *nmaps = 1;

        return 0;

}

/*

 * Pass in a delayed allocate extent, convert it to real extents;

 * return to the caller the extent we create which maps on top of

 * the originating callers request.

 *

 * Called without a lock on the inode.

 */

int

xfs_iomap_write_allocate(

        xfs_inode_t     *ip,

        xfs_bmbt_irec_t *map,

        int             *retmap)

{

        xfs_mount_t     *mp = ip->i_mount;

        xfs_fileoff_t   offset_fsb, last_block;

        xfs_fileoff_t   end_fsb, map_start_fsb;

        xfs_fsblock_t   first_block;

        xfs_bmap_free_t free_list;

        xfs_filblks_t   count_fsb;

        xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];

        xfs_trans_t     *tp;

        int             i, nimaps, committed;

        int             error = 0;

        int             nres;

        *retmap = 0;