/* * 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_shared.h" #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_mount.h" #include "xfs_inode.h" #include "xfs_btree.h" #include "xfs_bmap_btree.h" #include "xfs_bmap.h" #include "xfs_bmap_util.h" #include "xfs_error.h" #include "xfs_trans.h" #include "xfs_trans_space.h" #include "xfs_iomap.h" #include "xfs_trace.h" #include "xfs_icache.h" #include "xfs_quota.h" #include "xfs_dquot_item.h" #include "xfs_dquot.h" #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ << mp->m_writeio_log) #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP STATIC int xfs_iomap_eof_align_last_fsb( xfs_mount_t *mp, xfs_inode_t *ip, xfs_extlen_t extsize, xfs_fileoff_t *last_fsb) { xfs_extlen_t align = 0; int eof, error; if (!XFS_IS_REALTIME_INODE(ip)) { /* * Round up 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. * * If mounted with the "-o swalloc" option the alignment is * increased from the strip unit size to the stripe width. */ if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC)) align = mp->m_swidth; else if (mp->m_dalign) align = mp->m_dalign; if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align)) align = 0; } /* * 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 (align) align = roundup_64(align, extsize); else align = extsize; } if (align) { xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align); error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); if (error) return error; if (eof) *last_fsb = new_last_fsb; } return 0; } STATIC int xfs_alert_fsblock_zero( xfs_inode_t *ip, xfs_bmbt_irec_t *imap) { xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, "Access to block zero in inode %llu " "start_block: %llx start_off: %llx " "blkcnt: %llx extent-state: %x", (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, xfs_bmbt_irec_t *imap, int nmaps) { xfs_mount_t *mp = ip->i_mount; 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; int nimaps; int quota_flag; int rt; xfs_trans_t *tp; xfs_bmap_free_t free_list; uint qblocks, resblks, resrtextents; int committed; int error; int lockmode; int bmapi_flags = XFS_BMAPI_PREALLOC; rt = XFS_IS_REALTIME_INODE(ip); extsz = xfs_get_extsz_hint(ip); lockmode = XFS_ILOCK_SHARED; /* locked by caller */ ASSERT(xfs_isilocked(ip, lockmode)); offset_fsb = XFS_B_TO_FSBT(mp, offset); last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); if ((offset + count) > XFS_ISIZE(ip)) { /* * Assert that the in-core extent list is present since this can * call xfs_iread_extents() and we only have the ilock shared. * This should be safe because the lock was held around a bmapi * call in the caller and we only need it to access the in-core * list. */ ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags & XFS_IFEXTENTS); error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); if (error) goto out_unlock; } else { if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) last_fsb = MIN(last_fsb, (xfs_fileoff_t) imap->br_blockcount + 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; } /* * Drop the shared lock acquired by the caller, attach the dquot if * necessary and move on to transaction setup. */ xfs_iunlock(ip, lockmode); error = xfs_qm_dqattach(ip, 0); if (error) return error; /* * Allocate and setup the transaction 
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either ENOSPC or EDQUOT. Retry * without EOF preallocation. */ if (nimaps == 0) { trace_xfs_delalloc_enospc(ip, offset, count); if (prealloc) { prealloc = 0; error = 0; goto retry; } return error ? error : -ENOSPC; } if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) return xfs_alert_fsblock_zero(ip, &imap[0]); /* * Tag the inode as speculatively preallocated so we can reclaim this * space on demand, if necessary. */ if (prealloc) xfs_inode_set_eofblocks_tag(ip); *ret_imap = imap[0]; 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. * * We no longer bother to look at the incoming map - all we have to * guarantee is that whatever we allocate fills the required range. */ int xfs_iomap_write_allocate( xfs_inode_t *ip, xfs_off_t offset, xfs_bmbt_irec_t *imap) { 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_trans_t *tp; int nimaps, committed; int error = 0; int nres; /* * Make sure that the dquots are there. */ error = xfs_qm_dqattach(ip, 0); if (error) return error; offset_fsb = XFS_B_TO_FSBT(mp, offset); count_fsb = imap->br_blockcount; map_start_fsb = imap->br_startoff; XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); while (count_fsb != 0) { /* * Set up a transaction with which to allocate the * backing store for the file. Do allocations in a * loop until we get some space in the range we are * interested in. The other space that might be allocated * is in the delayed allocation extent on which we sit * but before our buffer starts. */ nimaps = 0; while (nimaps == 0) { tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); tp->t_flags |= XFS_TRANS_RESERVE; nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, nres, 0); if (error) { xfs_trans_cancel(tp); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); xfs_bmap_init(&free_list, &first_block); /* * it is possible that the extents have changed since * we did the read call as we dropped the ilock for a * while. We have to be careful about truncates or hole * punchs here - we are not allowed to allocate * non-delalloc blocks here. * * The only protection against truncation is the pages * for the range we are being asked to convert are * locked and hence a truncate will block on them * first. * * As a result, if we go beyond the range we really * need and hit an delalloc extent boundary followed by * a hole while we have excess blocks in the map, we * will fill the hole incorrectly and overrun the * transaction reservation. * * Using a single map prevents this as we are forced to * check each map we look for overlap with the desired * range and abort as soon as we find it. Also, given * that we only return a single map, having one beyond * what we can return is probably a bit silly. * * We also need to check that we don't go beyond EOF; * this is a truncate optimisation as a truncate sets * the new file size before block on the pages we * currently have locked under writeback. Because they * are about to be tossed, we don't need to write them * back.... */ nimaps = 1; end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)); error = xfs_bmap_last_offset(ip, &last_block, XFS_DATA_FORK); if (error) goto trans_cancel; last_block = XFS_FILEOFF_MAX(last_block, end_fsb); if ((map_start_fsb + count_fsb) > last_block) { count_fsb = last_block - map_start_fsb; if (count_fsb == 0) { error = -EAGAIN; goto trans_cancel; } } /* * From this point onwards we overwrite the imap * pointer that the caller gave to us. */ error = xfs_bmapi_write(tp, ip, map_start_fsb, count_fsb, 0, &first_block, nres, imap, &nimaps, &free_list); if (error) goto trans_cancel; error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) goto trans_cancel; error = xfs_trans_commit(tp); if (error) goto error0; xfs_iunlock(ip, XFS_ILOCK_EXCL); } /* * See if we were able to allocate an extent that * covers at least part of the callers request */ if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) return xfs_alert_fsblock_zero(ip, imap); if ((offset_fsb >= imap->br_startoff) && (offset_fsb < (imap->br_startoff + imap->br_blockcount))) { XFS_STATS_INC(mp, xs_xstrat_quick); return 0; } /* * So far we have not mapped the requested part of the * file, just surrounding data, try again. */ count_fsb -= imap->br_blockcount; map_start_fsb = imap->br_startoff + imap->br_blockcount; } trans_cancel: xfs_bmap_cancel(&free_list); xfs_trans_cancel(tp); error0: xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; } int xfs_iomap_write_unwritten( xfs_inode_t *ip, xfs_off_t offset, xfs_off_t count) { xfs_mount_t *mp = ip->i_mount; xfs_fileoff_t offset_fsb; xfs_filblks_t count_fsb; xfs_filblks_t numblks_fsb; xfs_fsblock_t firstfsb; int nimaps; xfs_trans_t *tp; xfs_bmbt_irec_t imap; xfs_bmap_free_t free_list; xfs_fsize_t i_size; uint resblks; int committed; int error; trace_xfs_unwritten_convert(ip, offset, count); offset_fsb = XFS_B_TO_FSBT(mp, offset); count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); /* * Reserve enough blocks in this transaction for two complete extent * btree splits. We may be converting the middle part of an unwritten * extent and in this case we will insert two new extents in the btree * each of which could cause a full split. * * This reservation amount will be used in the first call to * xfs_bmbt_split() to select an AG with enough space to satisfy the * rest of the operation. */ 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 * we have covered the range passed in. * * Note that we open code the transaction allocation here * to pass KM_NOFS--we can't risk to recursing back into * the filesystem here as we might be asked to write out * the same inode that we complete here and might deadlock * on the iolock. */ sb_start_intwrite(mp->m_super); tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); tp->t_flags |= XFS_TRANS_RESERVE | XFS_TRANS_FREEZE_PROT; error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, resblks, 0); if (error) { xfs_trans_cancel(tp); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); /* * Modify the unwritten extent state of the buffer. */ xfs_bmap_init(&free_list, &firstfsb); nimaps = 1; error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, XFS_BMAPI_CONVERT, &firstfsb, resblks, &imap, &nimaps, &free_list); if (error) goto error_on_bmapi_transaction; /* * Log the updated inode size as we go. We have to be careful * to only log it up to the actual write offset if it is * halfway into a block. */ i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb); if (i_size > offset + count) i_size = offset + count; i_size = xfs_new_eof(ip, i_size); if (i_size) { ip->i_d.di_size = i_size; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); } error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) goto error_on_bmapi_transaction; error = xfs_trans_commit(tp); xfs_iunlock(ip, XFS_ILOCK_EXCL); if (error) return error; if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) return xfs_alert_fsblock_zero(ip, &imap); if ((numblks_fsb = imap.br_blockcount) == 0) { /* * The numblks_fsb value should always get * smaller, otherwise the loop is stuck. */ ASSERT(imap.br_blockcount); break; } offset_fsb += numblks_fsb; count_fsb -= numblks_fsb; } while (count_fsb > 0); return 0; error_on_bmapi_transaction: xfs_bmap_cancel(&free_list); xfs_trans_cancel(tp); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; }