[XFS] Implement the di_extsize allocator hint for non-realtime files as

well.  Also provides a mechanism for inheriting this property from the
parent directory for new files.

SGI-PV: 945264
SGI-Modid: xfs-linux-melb:xfs-kern:24367a

Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 211 insertions, 179 deletions

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 45a77a3a6c07..5ecf3e3e86aa 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -263,7 +263,7 @@ phase2:
         case BMAPI_WRITE:
                 /* If we found an extent, return it */
                 if (nimaps &&
-                    (imap.br_startblock != HOLESTARTBLOCK) && 
+                    (imap.br_startblock != HOLESTARTBLOCK) &&
                     (imap.br_startblock != DELAYSTARTBLOCK)) {
                         xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
                                         offset, count, iomapp, &imap, flags);
@@ -318,6 +318,58 @@ out:
 }
 
 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,
@@ -363,19 +415,20 @@ xfs_iomap_write_direct(
         xfs_iocore_t    *io = &ip->i_iocore;
         xfs_fileoff_t   offset_fsb;
         xfs_fileoff_t   last_fsb;
-        xfs_filblks_t   count_fsb;
+        xfs_filblks_t   count_fsb, resaligned;
         xfs_fsblock_t   firstfsb;
+        xfs_extlen_t    extsz, temp;
+        xfs_fsize_t     isize;
         int             nimaps;
-        int             error;
         int             bmapi_flag;
         int             quota_flag;
         int             rt;
         xfs_trans_t     *tp;
         xfs_bmbt_irec_t imap;
         xfs_bmap_free_t free_list;
-        xfs_filblks_t   qblocks, resblks;
+        uint            qblocks, resblks, resrtextents;
         int             committed;
-        int             resrtextents;
+        int             error;
 
         /*
          * Make sure that the dquots are there. This doesn't hold
@@ -385,37 +438,52 @@ xfs_iomap_write_direct(
         if (error)
                 return XFS_ERROR(error);
 
-        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);
+        rt = XFS_IS_REALTIME_INODE(ip);
+        if (unlikely(rt)) {
+                if (!(extsz = ip->i_d.di_extsize))
+                        extsz = mp->m_sb.sb_rextsize;
+        } else {
+                extsz = ip->i_d.di_extsize;
         }
 
-        /*
-         * Determine if reserving space on the data or realtime partition.
-         */
-        if ((rt = XFS_IS_REALTIME_INODE(ip))) {
-                xfs_extlen_t    extsz;
+        isize = ip->i_d.di_size;
+        if (io->io_new_size > isize)
+                isize = io->io_new_size;
 
-                if (!(extsz = ip->i_d.di_extsize))
-                        extsz = mp->m_sb.sb_rextsize;
-                resrtextents = qblocks = (count_fsb + extsz - 1);
-                do_div(resrtextents, mp->m_sb.sb_rextsize);
-                resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
-                quota_flag = XFS_QMOPT_RES_RTBLKS;
+        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 {
-                resrtextents = 0;
-                resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, count_fsb);
-                quota_flag = XFS_QMOPT_RES_REGBLKS;
+                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
@@ -426,7 +494,6 @@ xfs_iomap_write_direct(
                         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
          */
@@ -436,20 +503,20 @@ xfs_iomap_write_direct(
         if (error)
                 goto error_out;
 
-        if (XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag)) {
-                error = (EDQUOT);
+        error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
+                                              qblocks, 0, quota_flag);
+        if (error)
                 goto error1;
-        }
 
-        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_WRITE;
+        if ((flags & BMAPI_DIRECT) && (offset < ip->i_d.di_size || extsz))
                 bmapi_flag |= XFS_BMAPI_PREALLOC;
 
         /*
-         * Issue the bmapi() call to allocate the blocks
+         * Issue the xfs_bmapi() call to allocate the blocks
          */
         XFS_BMAP_INIT(&free_list, &firstfsb);
         nimaps = 1;
@@ -501,6 +568,62 @@ 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;
+                error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
+                                  0, &firstblock, 0, imap, &imaps, 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,
@@ -514,13 +637,15 @@ xfs_iomap_write_delay(
         xfs_iocore_t    *io = &ip->i_iocore;
         xfs_fileoff_t   offset_fsb;
         xfs_fileoff_t   last_fsb;
-        xfs_fsize_t     isize;
+        xfs_off_t       aligned_offset;
+        xfs_fileoff_t   ioalign;
         xfs_fsblock_t   firstblock;
+        xfs_extlen_t    extsz;
+        xfs_fsize_t     isize;
         int             nimaps;
-        int             error;
         xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
-        int             aeof;
-        int             fsynced = 0;
+        int             prealloc, fsynced = 0;
+        int             error;
 
         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
 
@@ -528,152 +653,57 @@ xfs_iomap_write_delay(
          * 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);
 
+        if (XFS_IS_REALTIME_INODE(ip)) {
+                if (!(extsz = ip->i_d.di_extsize))
+                        extsz = mp->m_sb.sb_rextsize;
+        } else {
+                extsz = ip->i_d.di_extsize;
+        }
+
+        offset_fsb = XFS_B_TO_FSBT(mp, offset);
+
 retry:
         isize = ip->i_d.di_size;
-        if (io->io_new_size > isize) {
+        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().
-         *
-         * 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.
-         */
-        if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
-                xfs_off_t       aligned_offset;
-                xfs_filblks_t   count_fsb;
-                unsigned int    iosize;
-                xfs_fileoff_t   ioalign;
-                int             n;
-                xfs_fileoff_t   start_fsb;
+        error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count,
+                                ioflag, imap, XFS_WRITE_IMAPS, &prealloc);
+        if (error)
+                return error;
 
-                /*
-                 * 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) {
-                        nimaps = XFS_WRITE_IMAPS;
-                        error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
-                                        0, &firstblock, 0, imap, &nimaps, NULL);
-                        if (error) {
-                                return error;
-                        }
-                        for (n = 0; n < nimaps; n++) {
-                                if ( !(io->io_flags & XFS_IOCORE_RT)  && 
-                                        !imap[n].br_startblock) {
-                                        cmn_err(CE_PANIC,"Access to block "
-                                                "zero:  fs <%s> inode: %lld "
-                                                "start_block : %llx start_off "
-                                                ": %llx blkcnt : %llx "
-                                                "extent-state : %x \n",
-                                                (ip->i_mount)->m_fsname,
-                                                (long long)ip->i_ino,
-                                                imap[n].br_startblock,
-                                                imap[n].br_startoff,
-                                                imap[n].br_blockcount,
-                                                imap[n].br_state);
-                                }
-                                if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
-                                    (imap[n].br_startblock != DELAYSTARTBLOCK)) {
-                                        goto write_map;
-                                }
-                                start_fsb += imap[n].br_blockcount;
-                                count_fsb -= imap[n].br_blockcount;
-                        }
-                }
-                iosize = mp->m_writeio_blocks;
+        if (prealloc) {
                 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
                 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
-                last_fsb = ioalign + iosize;
-                aeof = 1;
+                last_fsb = ioalign + mp->m_writeio_blocks;
+        } else {
+                last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
         }
-write_map:
-        nimaps = XFS_WRITE_IMAPS;
-        firstblock = NULLFSBLOCK;
 
-        /*
-         * 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.
-         */
-        if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth 
-            && (mp->m_flags & XFS_MOUNT_SWALLOC)
-            && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
-                int eof;
-                xfs_fileoff_t new_last_fsb;
-
-                new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
-                error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
-                if (error) {
-                        return error;
-                }
-                if (eof) {
-                        last_fsb = new_last_fsb;
-                }
-        /*
-         * 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 (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
-                   (isize >= XFS_FSB_TO_B(mp, 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;
-                }
-        /*
-         * Round up the allocation request to a real-time extent boundary
-         * if the file is on the real-time subvolume.
-         */
-        } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
-                int eof;
-                xfs_fileoff_t new_last_fsb;
-
-                new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
-                error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
-                if (error) {
+        if (prealloc || extsz) {
+                error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,
+                                                        &last_fsb);
+                if (error)
                         return error;
-                }
-                if (eof)
-                        last_fsb = new_last_fsb;
         }
+
+        nimaps = XFS_WRITE_IMAPS;
+        firstblock = NULLFSBLOCK;
         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)) {
+        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.
+         * then we must have run out of space - flush delalloc, and retry..
          */
         if (nimaps == 0) {
                 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
@@ -685,9 +715,7 @@ write_map:
                 goto retry;
         }
 
-        *ret_imap = imap[0];
-        *nmaps = 1;
-        if ( !(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
+        if (!(io->io_flags & XFS_IOCORE_RT)  && !ret_imap->br_startblock) {
                 cmn_err(CE_PANIC,"Access to block zero:  fs <%s> inode: %lld "
                         "start_block : %llx start_off : %llx blkcnt : %llx "
                         "extent-state : %x \n",
@@ -696,6 +724,10 @@ write_map:
                         ret_imap->br_startblock, ret_imap->br_startoff,
                         ret_imap->br_blockcount,ret_imap->br_state);
         }
+
+        *ret_imap = imap[0];
+        *nmaps = 1;
+
         return 0;
 }
 
@@ -868,17 +900,17 @@ xfs_iomap_write_unwritten(
 {
         xfs_mount_t     *mp = ip->i_mount;
         xfs_iocore_t    *io = &ip->i_iocore;
-        xfs_trans_t     *tp;
         xfs_fileoff_t   offset_fsb;
         xfs_filblks_t   count_fsb;
         xfs_filblks_t   numblks_fsb;
-        xfs_bmbt_irec_t imap;
+        xfs_fsblock_t   firstfsb;
+        int             nimaps;
+        xfs_trans_t     *tp;
+        xfs_bmbt_irec_t imap;
+        xfs_bmap_free_t free_list;
+        uint            resblks;
         int             committed;
         int             error;
-        int             nres;
-        int             nimaps;
-        xfs_fsblock_t   firstfsb;
-        xfs_bmap_free_t free_list;
 
         xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
                                 &ip->i_iocore, offset, count);
@@ -887,9 +919,9 @@ xfs_iomap_write_unwritten(
         count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
         count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
 
-        do {
-                nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+        resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
 
+        do {
                 /*
                  * set up a transaction to convert the range of extents
                  * from unwritten to real. Do allocations in a loop until
@@ -897,7 +929,7 @@ xfs_iomap_write_unwritten(
                  */
 
                 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
-                error = xfs_trans_reserve(tp, nres,
+                error = xfs_trans_reserve(tp, resblks,
                                 XFS_WRITE_LOG_RES(mp), 0,
                                 XFS_TRANS_PERM_LOG_RES,
                                 XFS_WRITE_LOG_COUNT);
@@ -916,7 +948,7 @@ xfs_iomap_write_unwritten(
                 XFS_BMAP_INIT(&free_list, &firstfsb);
                 nimaps = 1;
                 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
-                                  XFS_BMAPI_WRITE, &firstfsb,
+                                  XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb,
                                   1, &imap, &nimaps, &free_list);
                 if (error)
                         goto error_on_bmapi_transaction;
@@ -930,7 +962,7 @@ xfs_iomap_write_unwritten(
                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
                 if (error)
                         goto error0;
-                
+
                 if ( !(io->io_flags & XFS_IOCORE_RT)  && !imap.br_startblock) {
                         cmn_err(CE_PANIC,"Access to block zero:  fs <%s> "
                                 "inode: %lld start_block : %llx start_off : "