diff options
Diffstat (limited to 'fs/xfs/xfs_bmap.c')
| -rw-r--r-- | fs/xfs/xfs_bmap.c | 115 |
1 files changed, 89 insertions, 26 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c index cd01783a89d7..6f3276974555 100644 --- a/fs/xfs/xfs_bmap.c +++ b/fs/xfs/xfs_bmap.c @@ -4238,7 +4238,7 @@ xfs_bmap_validate_ret( ASSERT(i == 0 || mval[i - 1].br_startoff + mval[i - 1].br_blockcount == mval[i].br_startoff); - if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY)) + if (flags & XFS_BMAPI_WRITE) ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK && mval[i].br_startblock != HOLESTARTBLOCK); ASSERT(mval[i].br_state == XFS_EXT_NORM || @@ -4556,6 +4556,90 @@ out_unreserve_quota: } /* + * Map file blocks to filesystem blocks, adding delayed allocations as needed. + */ +int +xfs_bmapi_delay( + struct xfs_inode *ip, /* incore inode */ + xfs_fileoff_t bno, /* starting file offs. mapped */ + xfs_filblks_t len, /* length to map in file */ + struct xfs_bmbt_irec *mval, /* output: map values */ + int *nmap, /* i/o: mval size/count */ + int flags) /* XFS_BMAPI_... */ +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + struct xfs_bmbt_irec got; /* current file extent record */ + struct xfs_bmbt_irec prev; /* previous file extent record */ + xfs_fileoff_t obno; /* old block number (offset) */ + xfs_fileoff_t end; /* end of mapped file region */ + xfs_extnum_t lastx; /* last useful extent number */ + int eof; /* we've hit the end of extents */ + int n = 0; /* current extent index */ + int error = 0; + + ASSERT(*nmap >= 1); + ASSERT(*nmap <= XFS_BMAP_MAX_NMAP); + ASSERT(!(flags & ~XFS_BMAPI_ENTIRE)); + + if (unlikely(XFS_TEST_ERROR( + (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS && + XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE), + mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { + XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp); + return XFS_ERROR(EFSCORRUPTED); + } + + if (XFS_FORCED_SHUTDOWN(mp)) + return XFS_ERROR(EIO); + + XFS_STATS_INC(xs_blk_mapw); + + if (!(ifp->if_flags & XFS_IFEXTENTS)) { + error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK); + if (error) + return error; + } + + xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev); + end = bno + len; + obno = bno; + + while (bno < end && n < *nmap) { + if (eof || got.br_startoff > bno) { + error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got, + &prev, &lastx, eof); + if (error) { + if (n == 0) { + *nmap = 0; + return error; + } + break; + } + } + + /* set up the extent map to return. */ + xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags); + xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags); + + /* If we're done, stop now. */ + if (bno >= end || n >= *nmap) + break; + + /* Else go on to the next record. */ + prev = got; + if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) + xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got); + else + eof = 1; + } + + *nmap = n; + return 0; +} + + +/* * Map file blocks to filesystem blocks. * File range is given by the bno/len pair. * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set) @@ -4663,7 +4747,6 @@ xfs_bmapi( */ if ((flags & XFS_BMAPI_IGSTATE) && wr) /* if writing unwritten space */ wr = 0; /* no allocations are allowed */ - ASSERT(wr || !(flags & XFS_BMAPI_DELAY)); logflags = 0; nallocs = 0; cur = NULL; @@ -4698,8 +4781,7 @@ xfs_bmapi( if (eof && !wr) got.br_startoff = end; inhole = eof || got.br_startoff > bno; - wasdelay = wr && !inhole && !(flags & XFS_BMAPI_DELAY) && - isnullstartblock(got.br_startblock); + wasdelay = wr && !inhole && isnullstartblock(got.br_startblock); /* * First, deal with the hole before the allocated space * that we found, if any. @@ -4727,20 +4809,7 @@ xfs_bmapi( aoff = bno; } minlen = (flags & XFS_BMAPI_CONTIG) ? alen : 1; - if (flags & XFS_BMAPI_DELAY) { - error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got, - &prev, &lastx, eof); - if (error) { - if (n == 0) { - *nmap = 0; - ASSERT(cur == NULL); - return error; - } - break; - } - - goto trim_extent; - } else { + { /* * If first time, allocate and fill in * once-only bma fields. @@ -4851,14 +4920,8 @@ xfs_bmapi( ASSERT(got.br_startoff <= aoff); ASSERT(got.br_startoff + got.br_blockcount >= aoff + alen); -#ifdef DEBUG - if (flags & XFS_BMAPI_DELAY) { - ASSERT(isnullstartblock(got.br_startblock)); - ASSERT(startblockval(got.br_startblock) > 0); - } ASSERT(got.br_state == XFS_EXT_NORM || got.br_state == XFS_EXT_UNWRITTEN); -#endif /* * Fall down into the found allocated space case. */ @@ -4877,7 +4940,7 @@ xfs_bmapi( n++; continue; } -trim_extent: + /* Deal with the allocated space we found. */ xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags); @@ -4887,7 +4950,7 @@ trim_extent: */ if (wr && ((mval->br_state == XFS_EXT_UNWRITTEN && - ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) || + ((flags & XFS_BMAPI_PREALLOC) == 0)) || (mval->br_state == XFS_EXT_NORM && ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT)) == (XFS_BMAPI_PREALLOC|XFS_BMAPI_CONVERT))))) { |