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/*

 * Copyright (c) 2000-2006 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_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_alloc.h"

#include "xfs_dmapi.h"

#include "xfs_quota.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_btree.h"

#include "xfs_bmap.h"

#include "xfs_rtalloc.h"

#include "xfs_error.h"

#include "xfs_itable.h"

#include "xfs_rw.h"

#include "xfs_acl.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 *)((unsigned long)current_pid()),

                (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;

        int             pbm;

        xfs_fsblock_t   start_block;

        mp = io->io_mount;

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

                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;

                if (io->io_flags & XFS_IOCORE_RT) {

                        iomapp->iomap_flags |= IOMAP_REALTIME;

                        iomapp->iomap_target = mp->m_rtdev_targp;

                } else {

                        iomapp->iomap_target = mp->m_ddev_targp;

                }

                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;

                }

                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;

                break;

        case BMAPI_WRITE:

                xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);

                lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;

                if (flags & BMAPI_IGNSTATE)

                        bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;

                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, 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) &&

                    (imap.br_startblock != DELAYSTARTBLOCK)) {

                        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, offset, count,

                                                 &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_iomap_eof_align_last_fsb(

        xfs_mount_t     *mp,

        xfs_iocore_t    *io,

        xfs_fsize_t     isize,

        xfs_extlen_t    extsize,

        xfs_fileoff_t   *last_fsb)

{

        xfs_fileoff_t   new_last_fsb = 0;

        xfs_extlen_t    align;

        int             eof, error;

        if (io->io_flags & XFS_IOCORE_RT)

                ;

        /*

         * If mounted with the "-o swalloc" option, roundup the allocation

         * request to a stripe width boundary if the file size is >=

         * stripe width and we are allocating past the allocation eof.

         */

        else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&

                (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)))

                new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);

        /*

         * Roundup the allocation request to a stripe unit (m_dalign) boundary

         * if the file size is >= stripe unit size, and we are allocating past

         * the allocation eof.

         */

        else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)))

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

        /*

         * Always round up the allocation request to an extent boundary

         * (when file on a real-time subvolume or has di_extsize hint).

         */

        if (extsize) {

                if (new_last_fsb)

                        align = roundup_64(new_last_fsb, extsize);

                else

                        align = extsize;

                new_last_fsb = roundup_64(*last_fsb, align);

        }

        if (new_last_fsb) {

                error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);

                if (error)

                        return error;

                if (eof)

                        *last_fsb = new_last_fsb;

        }

        return 0;

}

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;

}

STATIC int

xfs_cmn_err_fsblock_zero(

        xfs_inode_t     *ip,

        xfs_bmbt_irec_t *imap)

{

        xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,

                        "Access to block zero in inode %llu "

                        "start_block: %llx start_off: %llx "

                        "blkcnt: %llx extent-state: %x\n",

                (unsigned long long)ip->i_ino,

                (unsigned long long)imap->br_startblock,

                (unsigned long long)imap->br_startoff,

                (unsigned long long)imap->br_blockcount,

                imap->br_state);

        return EFSCORRUPTED;

}

int

xfs_iomap_write_direct(

        xfs_inode_t     *ip,

        xfs_off_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, resaligned;

        xfs_fsblock_t   firstfsb;

        xfs_extlen_t    extsz, temp;

        xfs_fsize_t     isize;

        int             nimaps;

        int             bmapi_flag;

        int             quota_flag;

        int             rt;

        xfs_trans_t     *tp;

        xfs_bmbt_irec_t imap;

        xfs_bmap_free_t free_list;

        uint            qblocks, resblks, resrtextents;

        int             committed;

        int             error;

        /*

         * 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);

        rt = XFS_IS_REALTIME_INODE(ip);

        extsz = xfs_get_extsz_hint(ip);

        isize = ip->i_size;

        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)));

        if ((offset + count) > isize) {

                error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,

                                                        &last_fsb);

                if (error)

                        goto error_out;

        } else {

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

                        last_fsb = MIN(last_fsb, (xfs_fileoff_t)

                                        ret_imap->br_blockcount +

                                        ret_imap->br_startoff);

        }

        count_fsb = last_fsb - offset_fsb;

        ASSERT(count_fsb > 0);

        resaligned = count_fsb;

        if (unlikely(extsz)) {

                if ((temp = do_mod(offset_fsb, extsz)))

                        resaligned += temp;

                if ((temp = do_mod(resaligned, extsz)))

                        resaligned += extsz - temp;

        }

        if (unlikely(rt)) {

                resrtextents = qblocks = resaligned;

                resrtextents /= mp->m_sb.sb_rextsize;

                resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);

                quota_flag = XFS_QMOPT_RES_RTBLKS;

        } else {

                resrtextents = 0;

                resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);

                quota_flag = XFS_QMOPT_RES_REGBLKS;

        }

        /*

         * Allocate and setup the transaction

         */

        xfs_iunlock(ip, XFS_ILOCK_EXCL);

        tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);

        error = xfs_trans_reserve(tp, resblks,

                        XFS_WRITE_LOG_RES(mp), resrtextents,

                        XFS_TRANS_PERM_LOG_RES,

                        XFS_WRITE_LOG_COUNT);

        /*

         * Check for running out of space, note: need lock to return

         */

        if (error)

                xfs_trans_cancel(tp, 0);

        xfs_ilock(ip, XFS_ILOCK_EXCL);

        if (error)

                goto error_out;

        error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,

                                              qblocks, 0, quota_flag);

        if (error)

                goto error1;

        xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

        xfs_trans_ihold(tp, ip);

        bmapi_flag = XFS_BMAPI_WRITE;

        if ((flags & BMAPI_DIRECT) && (offset < ip->i_size || extsz))

                bmapi_flag |= XFS_BMAPI_PREALLOC;

        /*

         * Issue the xfs_bmapi() call to allocate the blocks

         */

        XFS_BMAP_INIT(&free_list, &firstfsb);

        nimaps = 1;

        error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, bmapi_flag,

                &firstfsb, 0, &imap, &nimaps, &free_list, NULL);

        if (error)

                goto error0;

        /*

         * Complete the transaction

         */

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

        if (error)

                goto error0;

        error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);

        if (error)

                goto error_out;

        /*

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

         */

        if (nimaps == 0) {

                error = ENOSPC;

                goto error_out;

        }

        if (unlikely(!imap.br_startblock && !(io->io_flags & XFS_IOCORE_RT))) {

                error = xfs_cmn_err_fsblock_zero(ip, &imap);

                goto error_out;

        }

        *ret_imap = imap;

        *nmaps = 1;

        return 0;

error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */

        xfs_bmap_cancel(&free_list);

        XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);

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);

}

/*

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

 * then extend the allocation out to the file system's write

 * iosize.  We clean up any extra space left over when the

 * file is closed in xfs_inactive().

 *

 * For sync writes, we are flushing delayed allocate space to

 * try to make additional space available for allocation near

 * the filesystem full boundary - preallocation hurts in that

 * situation, of course.

 */

STATIC int

xfs_iomap_eof_want_preallocate(

        xfs_mount_t     *mp,

        xfs_iocore_t    *io,

        xfs_fsize_t     isize,

        xfs_off_t       offset,

        size_t          count,

        int             ioflag,

        xfs_bmbt_irec_t *imap,

        int             nimaps,

        int             *prealloc)

{

        xfs_fileoff_t   start_fsb;

        xfs_filblks_t   count_fsb;

        xfs_fsblock_t   firstblock;

        int             n, error, imaps;

        *prealloc = 0;

        if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize)

                return 0;

        /*

         * If there are any real blocks past eof, then don't

         * do any speculative allocation.

         */

        start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));

        count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));

        while (count_fsb > 0) {

                imaps = nimaps;

                firstblock = NULLFSBLOCK;

                error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 0,

                                  &firstblock, 0, imap, &imaps, NULL, NULL);

                if (error)

                        return error;

                for (n = 0; n < imaps; n++) {

                        if ((imap[n].br_startblock != HOLESTARTBLOCK) &&

                            (imap[n].br_startblock != DELAYSTARTBLOCK))

                                return 0;

                        start_fsb += imap[n].br_blockcount;

                        count_fsb -= imap[n].br_blockcount;

                }

        }

        *prealloc = 1;

        return 0;

}

int

xfs_iomap_write_delay(

        xfs_inode_t     *ip,

        xfs_off_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_off_t       aligned_offset;

        xfs_fileoff_t   ioalign;

        xfs_fsblock_t   firstblock;

        xfs_extlen_t    extsz;

        xfs_fsize_t     isize;

        int             nimaps;

        xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];

        int             prealloc, fsynced = 0;

        int             error;

        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);