/* * Read the value associated with an attribute from the out-of-line buffer * that we stored it in. */ int xfs_attr_rmtval_get( struct xfs_da_args *args) { struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE]; struct xfs_mount *mp = args->dp->i_mount; struct xfs_buf *bp; xfs_dablk_t lblkno = args->rmtblkno; __uint8_t *dst = args->value; int valuelen; int nmap; int error; int blkcnt = args->rmtblkcnt; int i; int offset = 0; trace_xfs_attr_rmtval_get(args); ASSERT(!(args->flags & ATTR_KERNOVAL)); ASSERT(args->rmtvaluelen == args->valuelen); valuelen = args->rmtvaluelen; while (valuelen > 0) { nmap = ATTR_RMTVALUE_MAPSIZE; error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, blkcnt, map, &nmap, XFS_BMAPI_ATTRFORK); if (error) return error; ASSERT(nmap >= 1); for (i = 0; (i < nmap) && (valuelen > 0); i++) { xfs_daddr_t dblkno; int dblkcnt; ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && (map[i].br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dblkno, dblkcnt, 0, &bp, &xfs_attr3_rmt_buf_ops); if (error) return error; error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino, &offset, &valuelen, &dst); xfs_buf_relse(bp); if (error) return error; /* roll attribute extent map forwards */ lblkno += map[i].br_blockcount; blkcnt -= map[i].br_blockcount; } } ASSERT(valuelen == 0); return 0; }
/* * Read in the in-core dquot's on-disk metadata and return the buffer. * Returns ENOENT to signal a hole. */ STATIC int xfs_dquot_disk_read( struct xfs_mount *mp, struct xfs_dquot *dqp, struct xfs_buf **bpp) { struct xfs_bmbt_irec map; struct xfs_buf *bp; struct xfs_inode *quotip = xfs_quota_inode(mp, dqp->dq_flags); uint lock_mode; int nmaps = 1; int error; lock_mode = xfs_ilock_data_map_shared(quotip); if (!xfs_this_quota_on(mp, dqp->dq_flags)) { /* * Return if this type of quotas is turned off while we * didn't have the quota inode lock. */ xfs_iunlock(quotip, lock_mode); return -ESRCH; } /* * Find the block map; no allocations yet */ error = xfs_bmapi_read(quotip, dqp->q_fileoffset, XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); xfs_iunlock(quotip, lock_mode); if (error) return error; ASSERT(nmaps == 1); ASSERT(map.br_blockcount >= 1); ASSERT(map.br_startblock != DELAYSTARTBLOCK); if (map.br_startblock == HOLESTARTBLOCK) return -ENOENT; trace_xfs_dqtobp_read(dqp); /* * store the blkno etc so that we don't have to do the * mapping all the time */ dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, mp->m_quotainfo->qi_dqchunklen, 0, &bp, &xfs_dquot_buf_ops); if (error) { ASSERT(bp == NULL); return error; } ASSERT(xfs_buf_islocked(bp)); xfs_buf_set_ref(bp, XFS_DQUOT_REF); *bpp = bp; return 0; }
/* * This routine is called to handle zeroing any space in the last block of the * file that is beyond the EOF. We do this since the size is being increased * without writing anything to that block and we don't want to read the * garbage on the disk. */ STATIC int /* error (positive) */ xfs_zero_last_block( struct xfs_inode *ip, xfs_fsize_t offset, xfs_fsize_t isize) { struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t last_fsb = XFS_B_TO_FSBT(mp, isize); int zero_offset = XFS_B_FSB_OFFSET(mp, isize); int zero_len; int nimaps = 1; int error = 0; struct xfs_bmbt_irec imap; xfs_ilock(ip, XFS_ILOCK_EXCL); error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0); xfs_iunlock(ip, XFS_ILOCK_EXCL); if (error) return error; ASSERT(nimaps > 0); /* * If the block underlying isize is just a hole, then there * is nothing to zero. */ if (imap.br_startblock == HOLESTARTBLOCK) return 0; zero_len = mp->m_sb.sb_blocksize - zero_offset; if (isize + zero_len > offset) zero_len = offset - isize; return xfs_iozero(ip, isize, zero_len); }
/* * Get a buffer for the bitmap or summary file block specified. * The buffer is returned read and locked. */ int xfs_rtbuf_get( xfs_mount_t *mp, /* file system mount structure */ xfs_trans_t *tp, /* transaction pointer */ xfs_rtblock_t block, /* block number in bitmap or summary */ int issum, /* is summary not bitmap */ xfs_buf_t **bpp) /* output: buffer for the block */ { xfs_buf_t *bp; /* block buffer, result */ xfs_inode_t *ip; /* bitmap or summary inode */ xfs_bmbt_irec_t map; int nmap = 1; int error; /* error value */ ip = issum ? mp->m_rsumip : mp->m_rbmip; error = xfs_bmapi_read(ip, block, 1, &map, &nmap, XFS_DATA_FORK); if (error) return error; if (nmap == 0 || !xfs_bmap_is_real_extent(&map)) return -EFSCORRUPTED; ASSERT(map.br_startblock != NULLFSBLOCK); error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, map.br_startblock), mp->m_bsize, 0, &bp, &xfs_rtbuf_ops); if (error) return error; xfs_trans_buf_set_type(tp, bp, issum ? XFS_BLFT_RTSUMMARY_BUF : XFS_BLFT_RTBITMAP_BUF); *bpp = bp; return 0; }
/* * Iteratively remap one file's extents (and holes) to another's. */ STATIC int xfs_reflink_remap_blocks( struct xfs_inode *src, xfs_fileoff_t srcoff, struct xfs_inode *dest, xfs_fileoff_t destoff, xfs_filblks_t len, xfs_off_t new_isize) { struct xfs_bmbt_irec imap; int nimaps; int error = 0; xfs_filblks_t range_len; /* drange = (destoff, destoff + len); srange = (srcoff, srcoff + len) */ while (len) { trace_xfs_reflink_remap_blocks_loop(src, srcoff, len, dest, destoff); /* Read extent from the source file */ nimaps = 1; xfs_ilock(src, XFS_ILOCK_EXCL); error = xfs_bmapi_read(src, srcoff, len, &imap, &nimaps, 0); xfs_iunlock(src, XFS_ILOCK_EXCL); if (error) goto err; ASSERT(nimaps == 1); trace_xfs_reflink_remap_imap(src, srcoff, len, XFS_IO_OVERWRITE, &imap); /* Translate imap into the destination file. */ range_len = imap.br_startoff + imap.br_blockcount - srcoff; imap.br_startoff += destoff - srcoff; /* Clear dest from destoff to the end of imap and map it in. */ error = xfs_reflink_remap_extent(dest, &imap, destoff, new_isize); if (error) goto err; if (fatal_signal_pending(current)) { error = -EINTR; goto err; } /* Advance drange/srange */ srcoff += range_len; destoff += range_len; len -= range_len; } return 0; err: trace_xfs_reflink_remap_blocks_error(dest, error, _RET_IP_); return error; }
STATIC int xfs_map_blocks( struct inode *inode, loff_t offset, struct xfs_bmbt_irec *imap, int type) { struct xfs_inode *ip = XFS_I(inode); struct xfs_mount *mp = ip->i_mount; ssize_t count = 1 << inode->i_blkbits; xfs_fileoff_t offset_fsb, end_fsb; int error = 0; int bmapi_flags = XFS_BMAPI_ENTIRE; int nimaps = 1; if (XFS_FORCED_SHUTDOWN(mp)) return -EIO; if (type == XFS_IO_UNWRITTEN) bmapi_flags |= XFS_BMAPI_IGSTATE; xfs_ilock(ip, XFS_ILOCK_SHARED); ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || (ip->i_df.if_flags & XFS_IFEXTENTS)); ASSERT(offset <= mp->m_super->s_maxbytes); if (offset + count > mp->m_super->s_maxbytes) count = mp->m_super->s_maxbytes - offset; end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); offset_fsb = XFS_B_TO_FSBT(mp, offset); error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, imap, &nimaps, bmapi_flags); xfs_iunlock(ip, XFS_ILOCK_SHARED); if (error) return error; if (type == XFS_IO_DELALLOC && (!nimaps || isnullstartblock(imap->br_startblock))) { error = xfs_iomap_write_allocate(ip, offset, imap); if (!error) trace_xfs_map_blocks_alloc(ip, offset, count, type, imap); return error; } #ifdef DEBUG if (type == XFS_IO_UNWRITTEN) { ASSERT(nimaps); ASSERT(imap->br_startblock != HOLESTARTBLOCK); ASSERT(imap->br_startblock != DELAYSTARTBLOCK); } #endif if (nimaps) trace_xfs_map_blocks_found(ip, offset, count, type, imap); return 0; }
/* * This routine is called to handle zeroing any space in the last * block of the file that is beyond the EOF. We do this since the * size is being increased without writing anything to that block * and we don't want anyone to read the garbage on the disk. */ STATIC int /* error (positive) */ xfs_zero_last_block( xfs_inode_t *ip, xfs_fsize_t offset, xfs_fsize_t isize) { xfs_fileoff_t last_fsb; xfs_mount_t *mp = ip->i_mount; int nimaps; int zero_offset; int zero_len; int error = 0; xfs_bmbt_irec_t imap; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); zero_offset = XFS_B_FSB_OFFSET(mp, isize); if (zero_offset == 0) { /* * There are no extra bytes in the last block on disk to * zero, so return. */ return 0; } last_fsb = XFS_B_TO_FSBT(mp, isize); nimaps = 1; error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0); if (error) return error; ASSERT(nimaps > 0); /* * If the block underlying isize is just a hole, then there * is nothing to zero. */ if (imap.br_startblock == HOLESTARTBLOCK) { return 0; } /* * Zero the part of the last block beyond the EOF, and write it * out sync. We need to drop the ilock while we do this so we * don't deadlock when the buffer cache calls back to us. */ xfs_iunlock(ip, XFS_ILOCK_EXCL); zero_len = mp->m_sb.sb_blocksize - zero_offset; if (isize + zero_len > offset) zero_len = offset - isize; error = xfs_iozero(ip, isize, zero_len); xfs_ilock(ip, XFS_ILOCK_EXCL); ASSERT(error >= 0); return error; }
STATIC int xfs_zero_last_block( xfs_inode_t *ip, xfs_fsize_t offset, xfs_fsize_t isize) { xfs_fileoff_t last_fsb; xfs_mount_t *mp = ip->i_mount; int nimaps; int zero_offset; int zero_len; int error = 0; xfs_bmbt_irec_t imap; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); zero_offset = XFS_B_FSB_OFFSET(mp, isize); if (zero_offset == 0) { return 0; } last_fsb = XFS_B_TO_FSBT(mp, isize); nimaps = 1; error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0); if (error) return error; ASSERT(nimaps > 0); if (imap.br_startblock == HOLESTARTBLOCK) { return 0; } xfs_iunlock(ip, XFS_ILOCK_EXCL); zero_len = mp->m_sb.sb_blocksize - zero_offset; if (isize + zero_len > offset) zero_len = offset - isize; error = xfs_iozero(ip, isize, zero_len); xfs_ilock(ip, XFS_ILOCK_EXCL); ASSERT(error >= 0); return error; }
/* * Ensure the size update falls into a valid allocated block. */ static int xfs_pnfs_validate_isize( struct xfs_inode *ip, xfs_off_t isize) { struct xfs_bmbt_irec imap; int nimaps = 1; int error = 0; xfs_ilock(ip, XFS_ILOCK_SHARED); error = xfs_bmapi_read(ip, XFS_B_TO_FSBT(ip->i_mount, isize - 1), 1, &imap, &nimaps, 0); xfs_iunlock(ip, XFS_ILOCK_SHARED); if (error) return error; if (imap.br_startblock == HOLESTARTBLOCK || imap.br_startblock == DELAYSTARTBLOCK || imap.br_state == XFS_EXT_UNWRITTEN) return -EIO; return 0; }
/* * Zero any on disk space between the current EOF and the new, larger EOF. * * This handles the normal case of zeroing the remainder of the last block in * the file and the unusual case of zeroing blocks out beyond the size of the * file. This second case only happens with fixed size extents and when the * system crashes before the inode size was updated but after blocks were * allocated. * * Expects the iolock to be held exclusive, and will take the ilock internally. */ int /* error (positive) */ xfs_zero_eof( struct xfs_inode *ip, xfs_off_t offset, /* starting I/O offset */ xfs_fsize_t isize) /* current inode size */ { struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t start_zero_fsb; xfs_fileoff_t end_zero_fsb; xfs_fileoff_t zero_count_fsb; xfs_fileoff_t last_fsb; xfs_fileoff_t zero_off; xfs_fsize_t zero_len; int nimaps; int error = 0; struct xfs_bmbt_irec imap; ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); ASSERT(offset > isize); /* * First handle zeroing the block on which isize resides. * * We only zero a part of that block so it is handled specially. */ if (XFS_B_FSB_OFFSET(mp, isize) != 0) { error = xfs_zero_last_block(ip, offset, isize); if (error) return error; } /* * Calculate the range between the new size and the old where blocks * needing to be zeroed may exist. * * To get the block where the last byte in the file currently resides, * we need to subtract one from the size and truncate back to a block * boundary. We subtract 1 in case the size is exactly on a block * boundary. */ last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); if (last_fsb == end_zero_fsb) { /* * The size was only incremented on its last block. * We took care of that above, so just return. */ return 0; } ASSERT(start_zero_fsb <= end_zero_fsb); while (start_zero_fsb <= end_zero_fsb) { nimaps = 1; zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; xfs_ilock(ip, XFS_ILOCK_EXCL); error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb, &imap, &nimaps, 0); xfs_iunlock(ip, XFS_ILOCK_EXCL); if (error) return error; ASSERT(nimaps > 0); if (imap.br_state == XFS_EXT_UNWRITTEN || imap.br_startblock == HOLESTARTBLOCK) { start_zero_fsb = imap.br_startoff + imap.br_blockcount; ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); continue; } /* * There are blocks we need to zero. */ zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); if ((zero_off + zero_len) > offset) zero_len = offset - zero_off; error = xfs_iozero(ip, zero_off, zero_len); if (error) return error; start_zero_fsb = imap.br_startoff + imap.br_blockcount; ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); } return 0; }
/* * Remove the value associated with an attribute by deleting the * out-of-line buffer that it is stored on. */ int xfs_attr_rmtval_remove( struct xfs_da_args *args) { struct xfs_mount *mp = args->dp->i_mount; xfs_dablk_t lblkno; int blkcnt; int error; int done; trace_xfs_attr_rmtval_remove(args); /* * Roll through the "value", invalidating the attribute value's blocks. */ lblkno = args->rmtblkno; blkcnt = args->rmtblkcnt; while (blkcnt > 0) { struct xfs_bmbt_irec map; struct xfs_buf *bp; xfs_daddr_t dblkno; int dblkcnt; int nmap; /* * Try to remember where we decided to put the value. */ nmap = 1; error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); if (error) return error; ASSERT(nmap == 1); ASSERT((map.br_startblock != DELAYSTARTBLOCK) && (map.br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); /* * If the "remote" value is in the cache, remove it. */ bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK); if (bp) { xfs_buf_stale(bp); xfs_buf_relse(bp); bp = NULL; } lblkno += map.br_blockcount; blkcnt -= map.br_blockcount; } /* * Keep de-allocating extents until the remote-value region is gone. */ lblkno = args->rmtblkno; blkcnt = args->rmtblkcnt; done = 0; while (!done) { int committed; xfs_bmap_init(args->flist, args->firstblock); error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, 1, args->firstblock, args->flist, &done); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); return error; } /* * bmap_finish() may have committed the last trans and started * a new one. We need the inode to be in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, args->dp, 0); /* * Close out trans and start the next one in the chain. */ error = xfs_trans_roll(&args->trans, args->dp); if (error) return error; } return 0; }
/* ----- Kernel only functions below ----- */ STATIC int xfs_readlink_bmap( struct xfs_inode *ip, char *link) { struct xfs_mount *mp = ip->i_mount; struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS]; struct xfs_buf *bp; xfs_daddr_t d; char *cur_chunk; int pathlen = ip->i_d.di_size; int nmaps = XFS_SYMLINK_MAPS; int byte_cnt; int n; int error = 0; int fsblocks = 0; int offset; fsblocks = xfs_symlink_blocks(mp, pathlen); error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0); if (error) goto out; offset = 0; for (n = 0; n < nmaps; n++) { d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0, &xfs_symlink_buf_ops); if (!bp) return XFS_ERROR(ENOMEM); error = bp->b_error; if (error) { xfs_buf_ioerror_alert(bp, __func__); xfs_buf_relse(bp); /* bad CRC means corrupted metadata */ if (error == EFSBADCRC) error = EFSCORRUPTED; goto out; } byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt); if (pathlen < byte_cnt) byte_cnt = pathlen; cur_chunk = bp->b_addr; if (xfs_sb_version_hascrc(&mp->m_sb)) { if (!xfs_symlink_hdr_ok(mp, ip->i_ino, offset, byte_cnt, bp)) { error = EFSCORRUPTED; xfs_alert(mp, "symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)", offset, byte_cnt, ip->i_ino); xfs_buf_relse(bp); goto out; } cur_chunk += sizeof(struct xfs_dsymlink_hdr); } memcpy(link + offset, bp->b_addr, byte_cnt); pathlen -= byte_cnt; offset += byte_cnt; xfs_buf_relse(bp); } ASSERT(pathlen == 0); link[ip->i_d.di_size] = '\0'; error = 0; out: return error; }
/* * This is called by xfs_inactive to free any blocks beyond eof * when the link count isn't zero and by xfs_dm_punch_hole() when * punching a hole to EOF. */ int xfs_free_eofblocks( xfs_mount_t *mp, xfs_inode_t *ip, bool need_iolock) { xfs_trans_t *tp; int error; xfs_fileoff_t end_fsb; xfs_fileoff_t last_fsb; xfs_filblks_t map_len; int nimaps; xfs_bmbt_irec_t imap; /* * Figure out if there are any blocks beyond the end * of the file. If not, then there is nothing to do. */ end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip)); last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); if (last_fsb <= end_fsb) return 0; map_len = last_fsb - end_fsb; nimaps = 1; xfs_ilock(ip, XFS_ILOCK_SHARED); error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0); xfs_iunlock(ip, XFS_ILOCK_SHARED); if (!error && (nimaps != 0) && (imap.br_startblock != HOLESTARTBLOCK || ip->i_delayed_blks)) { /* * Attach the dquots to the inode up front. */ error = xfs_qm_dqattach(ip, 0); if (error) return error; /* * There are blocks after the end of file. * Free them up now by truncating the file to * its current size. */ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); if (need_iolock) { if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) { xfs_trans_cancel(tp, 0); return EAGAIN; } } error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); if (error) { ASSERT(XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); if (need_iolock) xfs_iunlock(ip, XFS_IOLOCK_EXCL); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); /* * Do not update the on-disk file size. If we update the * on-disk file size and then the system crashes before the * contents of the file are flushed to disk then the files * may be full of holes (ie NULL files bug). */ error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, XFS_ISIZE(ip)); if (error) { /* * If we get an error at this point we simply don't * bother truncating the file. */ xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); } else { error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); if (!error) xfs_inode_clear_eofblocks_tag(ip); } xfs_iunlock(ip, XFS_ILOCK_EXCL); if (need_iolock) xfs_iunlock(ip, XFS_IOLOCK_EXCL); } return error; }
/* * Get inode's extents as described in bmv, and format for output. * Calls formatter to fill the user's buffer until all extents * are mapped, until the passed-in bmv->bmv_count slots have * been filled, or until the formatter short-circuits the loop, * if it is tracking filled-in extents on its own. */ int /* error code */ xfs_getbmap( xfs_inode_t *ip, struct getbmapx *bmv, /* user bmap structure */ xfs_bmap_format_t formatter, /* format to user */ void *arg) /* formatter arg */ { __int64_t bmvend; /* last block requested */ int error = 0; /* return value */ __int64_t fixlen; /* length for -1 case */ int i; /* extent number */ int lock; /* lock state */ xfs_bmbt_irec_t *map; /* buffer for user's data */ xfs_mount_t *mp; /* file system mount point */ int nex; /* # of user extents can do */ int nexleft; /* # of user extents left */ int subnex; /* # of bmapi's can do */ int nmap; /* number of map entries */ struct getbmapx *out; /* output structure */ int whichfork; /* data or attr fork */ int prealloced; /* this is a file with * preallocated data space */ int iflags; /* interface flags */ int bmapi_flags; /* flags for xfs_bmapi */ int cur_ext = 0; mp = ip->i_mount; iflags = bmv->bmv_iflags; whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK; if (whichfork == XFS_ATTR_FORK) { if (XFS_IFORK_Q(ip)) { if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS && ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE && ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) return XFS_ERROR(EINVAL); } else if (unlikely( ip->i_d.di_aformat != 0 && ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) { XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW, ip->i_mount); return XFS_ERROR(EFSCORRUPTED); } prealloced = 0; fixlen = 1LL << 32; } else { if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && ip->i_d.di_format != XFS_DINODE_FMT_BTREE && ip->i_d.di_format != XFS_DINODE_FMT_LOCAL) return XFS_ERROR(EINVAL); if (xfs_get_extsz_hint(ip) || ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){ prealloced = 1; fixlen = mp->m_super->s_maxbytes; } else { prealloced = 0; fixlen = XFS_ISIZE(ip); } } if (bmv->bmv_length == -1) { fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen)); bmv->bmv_length = max_t(__int64_t, fixlen - bmv->bmv_offset, 0); } else if (bmv->bmv_length == 0) { bmv->bmv_entries = 0; return 0; } else if (bmv->bmv_length < 0) { return XFS_ERROR(EINVAL); } nex = bmv->bmv_count - 1; if (nex <= 0) return XFS_ERROR(EINVAL); bmvend = bmv->bmv_offset + bmv->bmv_length; if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx)) return XFS_ERROR(ENOMEM); out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0); if (!out) return XFS_ERROR(ENOMEM); xfs_ilock(ip, XFS_IOLOCK_SHARED); if (whichfork == XFS_DATA_FORK) { if (!(iflags & BMV_IF_DELALLOC) && (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size)) { error = -filemap_write_and_wait(VFS_I(ip)->i_mapping); if (error) goto out_unlock_iolock; /* * Even after flushing the inode, there can still be * delalloc blocks on the inode beyond EOF due to * speculative preallocation. These are not removed * until the release function is called or the inode * is inactivated. Hence we cannot assert here that * ip->i_delayed_blks == 0. */ } lock = xfs_ilock_data_map_shared(ip); } else { lock = xfs_ilock_attr_map_shared(ip); } /* * Don't let nex be bigger than the number of extents * we can have assuming alternating holes and real extents. */ if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1) nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1; bmapi_flags = xfs_bmapi_aflag(whichfork); if (!(iflags & BMV_IF_PREALLOC)) bmapi_flags |= XFS_BMAPI_IGSTATE; /* * Allocate enough space to handle "subnex" maps at a time. */ error = ENOMEM; subnex = 16; map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS); if (!map) goto out_unlock_ilock; bmv->bmv_entries = 0; if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 && (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) { error = 0; goto out_free_map; } nexleft = nex; do { nmap = (nexleft > subnex) ? subnex : nexleft; error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset), XFS_BB_TO_FSB(mp, bmv->bmv_length), map, &nmap, bmapi_flags); if (error) goto out_free_map; ASSERT(nmap <= subnex); for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) { out[cur_ext].bmv_oflags = 0; if (map[i].br_state == XFS_EXT_UNWRITTEN) out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC; else if (map[i].br_startblock == DELAYSTARTBLOCK) out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC; out[cur_ext].bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff); out[cur_ext].bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount); out[cur_ext].bmv_unused1 = 0; out[cur_ext].bmv_unused2 = 0; /* * delayed allocation extents that start beyond EOF can * occur due to speculative EOF allocation when the * delalloc extent is larger than the largest freespace * extent at conversion time. These extents cannot be * converted by data writeback, so can exist here even * if we are not supposed to be finding delalloc * extents. */ if (map[i].br_startblock == DELAYSTARTBLOCK && map[i].br_startoff <= XFS_B_TO_FSB(mp, XFS_ISIZE(ip))) ASSERT((iflags & BMV_IF_DELALLOC) != 0); if (map[i].br_startblock == HOLESTARTBLOCK && whichfork == XFS_ATTR_FORK) { /* came to the end of attribute fork */ out[cur_ext].bmv_oflags |= BMV_OF_LAST; goto out_free_map; } if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext], prealloced, bmvend, map[i].br_startblock)) goto out_free_map; bmv->bmv_offset = out[cur_ext].bmv_offset + out[cur_ext].bmv_length; bmv->bmv_length = max_t(__int64_t, 0, bmvend - bmv->bmv_offset); /* * In case we don't want to return the hole, * don't increase cur_ext so that we can reuse * it in the next loop. */ if ((iflags & BMV_IF_NO_HOLES) && map[i].br_startblock == HOLESTARTBLOCK) { memset(&out[cur_ext], 0, sizeof(out[cur_ext])); continue; } nexleft--; bmv->bmv_entries++; cur_ext++; } } while (nmap && nexleft && bmv->bmv_length); out_free_map: kmem_free(map); out_unlock_ilock: xfs_iunlock(ip, lock); out_unlock_iolock: xfs_iunlock(ip, XFS_IOLOCK_SHARED); for (i = 0; i < cur_ext; i++) { int full = 0; /* user array is full */ /* format results & advance arg */ error = formatter(&arg, &out[i], &full); if (error || full) break; } kmem_free(out); return error; }
/* * Zero file bytes between startoff and endoff inclusive. * The iolock is held exclusive and no blocks are buffered. * * This function is used by xfs_free_file_space() to zero * partial blocks when the range to free is not block aligned. * When unreserving space with boundaries that are not block * aligned we round up the start and round down the end * boundaries and then use this function to zero the parts of * the blocks that got dropped during the rounding. */ STATIC int xfs_zero_remaining_bytes( xfs_inode_t *ip, xfs_off_t startoff, xfs_off_t endoff) { xfs_bmbt_irec_t imap; xfs_fileoff_t offset_fsb; xfs_off_t lastoffset; xfs_off_t offset; xfs_buf_t *bp; xfs_mount_t *mp = ip->i_mount; int nimap; int error = 0; /* * Avoid doing I/O beyond eof - it's not necessary * since nothing can read beyond eof. The space will * be zeroed when the file is extended anyway. */ if (startoff >= XFS_ISIZE(ip)) return 0; if (endoff > XFS_ISIZE(ip)) endoff = XFS_ISIZE(ip); bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ? mp->m_rtdev_targp : mp->m_ddev_targp, BTOBB(mp->m_sb.sb_blocksize), 0); if (!bp) return XFS_ERROR(ENOMEM); xfs_buf_unlock(bp); for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { uint lock_mode; offset_fsb = XFS_B_TO_FSBT(mp, offset); nimap = 1; lock_mode = xfs_ilock_data_map_shared(ip); error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0); xfs_iunlock(ip, lock_mode); if (error || nimap < 1) break; ASSERT(imap.br_blockcount >= 1); ASSERT(imap.br_startoff == offset_fsb); lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; if (lastoffset > endoff) lastoffset = endoff; if (imap.br_startblock == HOLESTARTBLOCK) continue; ASSERT(imap.br_startblock != DELAYSTARTBLOCK); if (imap.br_state == XFS_EXT_UNWRITTEN) continue; XFS_BUF_UNDONE(bp); XFS_BUF_UNWRITE(bp); XFS_BUF_READ(bp); XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock)); if (XFS_FORCED_SHUTDOWN(mp)) { error = XFS_ERROR(EIO); break; } xfs_buf_iorequest(bp); error = xfs_buf_iowait(bp); if (error) { xfs_buf_ioerror_alert(bp, "xfs_zero_remaining_bytes(read)"); break; } memset(bp->b_addr + (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), 0, lastoffset - offset + 1); XFS_BUF_UNDONE(bp); XFS_BUF_UNREAD(bp); XFS_BUF_WRITE(bp); if (XFS_FORCED_SHUTDOWN(mp)) { error = XFS_ERROR(EIO); break; } xfs_buf_iorequest(bp); error = xfs_buf_iowait(bp); if (error) { xfs_buf_ioerror_alert(bp, "xfs_zero_remaining_bytes(write)"); break; } } xfs_buf_free(bp); return error; }
/* Clear the inode reflink flag if there are no shared extents. */ int xfs_reflink_clear_inode_flag( struct xfs_inode *ip, struct xfs_trans **tpp) { struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t fbno; xfs_filblks_t end; xfs_agnumber_t agno; xfs_agblock_t agbno; xfs_extlen_t aglen; xfs_agblock_t rbno; xfs_extlen_t rlen; struct xfs_bmbt_irec map; int nmaps; int error = 0; ASSERT(xfs_is_reflink_inode(ip)); fbno = 0; end = XFS_B_TO_FSB(mp, i_size_read(VFS_I(ip))); while (end - fbno > 0) { nmaps = 1; /* * Look for extents in the file. Skip holes, delalloc, or * unwritten extents; they can't be reflinked. */ error = xfs_bmapi_read(ip, fbno, end - fbno, &map, &nmaps, 0); if (error) return error; if (nmaps == 0) break; if (!xfs_bmap_is_real_extent(&map)) goto next; agno = XFS_FSB_TO_AGNO(mp, map.br_startblock); agbno = XFS_FSB_TO_AGBNO(mp, map.br_startblock); aglen = map.br_blockcount; error = xfs_reflink_find_shared(mp, agno, agbno, aglen, &rbno, &rlen, false); if (error) return error; /* Is there still a shared block here? */ if (rbno != NULLAGBLOCK) return 0; next: fbno = map.br_startoff + map.br_blockcount; } /* * We didn't find any shared blocks so turn off the reflink flag. * First, get rid of any leftover CoW mappings. */ error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, NULLFILEOFF, true); if (error) return error; /* Clear the inode flag. */ trace_xfs_reflink_unset_inode_flag(ip); ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; xfs_inode_clear_cowblocks_tag(ip); xfs_trans_ijoin(*tpp, ip, 0); xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE); return error; }
/* * Maps a dquot to the buffer containing its on-disk version. * This returns a ptr to the buffer containing the on-disk dquot * in the bpp param, and a ptr to the on-disk dquot within that buffer */ STATIC int xfs_qm_dqtobp( xfs_trans_t **tpp, xfs_dquot_t *dqp, xfs_disk_dquot_t **O_ddpp, xfs_buf_t **O_bpp, uint flags) { struct xfs_bmbt_irec map; int nmaps = 1, error; struct xfs_buf *bp; struct xfs_inode *quotip = xfs_dq_to_quota_inode(dqp); struct xfs_mount *mp = dqp->q_mount; xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id); struct xfs_trans *tp = (tpp ? *tpp : NULL); uint lock_mode; dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; lock_mode = xfs_ilock_data_map_shared(quotip); if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) { /* * Return if this type of quotas is turned off while we * didn't have the quota inode lock. */ xfs_iunlock(quotip, lock_mode); return ESRCH; } /* * Find the block map; no allocations yet */ error = xfs_bmapi_read(quotip, dqp->q_fileoffset, XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); xfs_iunlock(quotip, lock_mode); if (error) return error; ASSERT(nmaps == 1); ASSERT(map.br_blockcount == 1); /* * Offset of dquot in the (fixed sized) dquot chunk. */ dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * sizeof(xfs_dqblk_t); ASSERT(map.br_startblock != DELAYSTARTBLOCK); if (map.br_startblock == HOLESTARTBLOCK) { /* * We don't allocate unless we're asked to */ if (!(flags & XFS_QMOPT_DQALLOC)) return ENOENT; ASSERT(tp); error = xfs_qm_dqalloc(tpp, mp, dqp, quotip, dqp->q_fileoffset, &bp); if (error) return error; tp = *tpp; } else { trace_xfs_dqtobp_read(dqp); /* * store the blkno etc so that we don't have to do the * mapping all the time */ dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno, mp->m_quotainfo->qi_dqchunklen, 0, &bp, &xfs_dquot_buf_ops); if (error == EFSCORRUPTED && (flags & XFS_QMOPT_DQREPAIR)) { xfs_dqid_t firstid = (xfs_dqid_t)map.br_startoff * mp->m_quotainfo->qi_dqperchunk; ASSERT(bp == NULL); error = xfs_qm_dqrepair(mp, tp, dqp, firstid, &bp); } if (error) { ASSERT(bp == NULL); return XFS_ERROR(error); } } ASSERT(xfs_buf_islocked(bp)); *O_bpp = bp; *O_ddpp = bp->b_addr + dqp->q_bufoffset; return (0); }
STATIC loff_t xfs_seek_hole( struct file *file, loff_t start) { struct inode *inode = file->f_mapping->host; struct xfs_inode *ip = XFS_I(inode); struct xfs_mount *mp = ip->i_mount; loff_t uninitialized_var(offset); xfs_fsize_t isize; xfs_fileoff_t fsbno; xfs_filblks_t end; uint lock; int error; if (XFS_FORCED_SHUTDOWN(mp)) return -XFS_ERROR(EIO); lock = xfs_ilock_data_map_shared(ip); isize = i_size_read(inode); if (start >= isize) { error = ENXIO; goto out_unlock; } fsbno = XFS_B_TO_FSBT(mp, start); end = XFS_B_TO_FSB(mp, isize); for (;;) { struct xfs_bmbt_irec map[2]; int nmap = 2; unsigned int i; error = xfs_bmapi_read(ip, fsbno, end - fsbno, map, &nmap, XFS_BMAPI_ENTIRE); if (error) goto out_unlock; /* No extents at given offset, must be beyond EOF */ if (nmap == 0) { error = ENXIO; goto out_unlock; } for (i = 0; i < nmap; i++) { offset = max_t(loff_t, start, XFS_FSB_TO_B(mp, map[i].br_startoff)); /* Landed in a hole */ if (map[i].br_startblock == HOLESTARTBLOCK) goto out; /* * Landed in an unwritten extent, try to search hole * from page cache. */ if (map[i].br_state == XFS_EXT_UNWRITTEN) { if (xfs_find_get_desired_pgoff(inode, &map[i], HOLE_OFF, &offset)) goto out; } } /* * map[0] contains data or its unwritten but contains * data in page cache, probably means that we are * reading after EOF. We should fix offset to point * to the end of the file(i.e., there is an implicit * hole at the end of any file). */ if (nmap == 1) { offset = isize; break; } ASSERT(i > 1); /* * Both mappings contains data, proceed to the next round of * search if the current reading offset not beyond or hit EOF. */ fsbno = map[i - 1].br_startoff + map[i - 1].br_blockcount; start = XFS_FSB_TO_B(mp, fsbno); if (start >= isize) { offset = isize; break; } } out: /* * At this point, we must have found a hole. However, the returned * offset may be bigger than the file size as it may be aligned to * page boundary for unwritten extents, we need to deal with this * situation in particular. */ offset = min_t(loff_t, offset, isize); offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); out_unlock: xfs_iunlock(ip, lock); if (error) return -error; return offset; }
STATIC loff_t xfs_seek_data( struct file *file, loff_t start) { struct inode *inode = file->f_mapping->host; struct xfs_inode *ip = XFS_I(inode); struct xfs_mount *mp = ip->i_mount; loff_t uninitialized_var(offset); xfs_fsize_t isize; xfs_fileoff_t fsbno; xfs_filblks_t end; uint lock; int error; lock = xfs_ilock_data_map_shared(ip); isize = i_size_read(inode); if (start >= isize) { error = ENXIO; goto out_unlock; } /* * Try to read extents from the first block indicated * by fsbno to the end block of the file. */ fsbno = XFS_B_TO_FSBT(mp, start); end = XFS_B_TO_FSB(mp, isize); for (;;) { struct xfs_bmbt_irec map[2]; int nmap = 2; unsigned int i; error = xfs_bmapi_read(ip, fsbno, end - fsbno, map, &nmap, XFS_BMAPI_ENTIRE); if (error) goto out_unlock; /* No extents at given offset, must be beyond EOF */ if (nmap == 0) { error = ENXIO; goto out_unlock; } for (i = 0; i < nmap; i++) { offset = max_t(loff_t, start, XFS_FSB_TO_B(mp, map[i].br_startoff)); /* Landed in a data extent */ if (map[i].br_startblock == DELAYSTARTBLOCK || (map[i].br_state == XFS_EXT_NORM && !isnullstartblock(map[i].br_startblock))) goto out; /* * Landed in an unwritten extent, try to search data * from page cache. */ if (map[i].br_state == XFS_EXT_UNWRITTEN) { if (xfs_find_get_desired_pgoff(inode, &map[i], DATA_OFF, &offset)) goto out; } } /* * map[0] is hole or its an unwritten extent but * without data in page cache. Probably means that * we are reading after EOF if nothing in map[1]. */ if (nmap == 1) { error = ENXIO; goto out_unlock; } ASSERT(i > 1); /* * Nothing was found, proceed to the next round of search * if reading offset not beyond or hit EOF. */ fsbno = map[i - 1].br_startoff + map[i - 1].br_blockcount; start = XFS_FSB_TO_B(mp, fsbno); if (start >= isize) { error = ENXIO; goto out_unlock; } } out: offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); out_unlock: xfs_iunlock(ip, lock); if (error) return -error; return offset; }
int /* error (positive) */ xfs_zero_eof( xfs_inode_t *ip, xfs_off_t offset, /* starting I/O offset */ xfs_fsize_t isize) /* current inode size */ { xfs_mount_t *mp = ip->i_mount; xfs_fileoff_t start_zero_fsb; xfs_fileoff_t end_zero_fsb; xfs_fileoff_t zero_count_fsb; xfs_fileoff_t last_fsb; xfs_fileoff_t zero_off; xfs_fsize_t zero_len; int nimaps; int error = 0; xfs_bmbt_irec_t imap; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); ASSERT(offset > isize); /* * First handle zeroing the block on which isize resides. * We only zero a part of that block so it is handled specially. */ error = xfs_zero_last_block(ip, offset, isize); if (error) { ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); return error; } /* * Calculate the range between the new size and the old * where blocks needing to be zeroed may exist. To get the * block where the last byte in the file currently resides, * we need to subtract one from the size and truncate back * to a block boundary. We subtract 1 in case the size is * exactly on a block boundary. */ last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); if (last_fsb == end_zero_fsb) { /* * The size was only incremented on its last block. * We took care of that above, so just return. */ return 0; } ASSERT(start_zero_fsb <= end_zero_fsb); while (start_zero_fsb <= end_zero_fsb) { nimaps = 1; zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb, &imap, &nimaps, 0); if (error) { ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); return error; } ASSERT(nimaps > 0); if (imap.br_state == XFS_EXT_UNWRITTEN || imap.br_startblock == HOLESTARTBLOCK) { /* * This loop handles initializing pages that were * partially initialized by the code below this * loop. It basically zeroes the part of the page * that sits on a hole and sets the page as P_HOLE * and calls remapf if it is a mapped file. */ start_zero_fsb = imap.br_startoff + imap.br_blockcount; ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); continue; } /* * There are blocks we need to zero. * Drop the inode lock while we're doing the I/O. * We'll still have the iolock to protect us. */ xfs_iunlock(ip, XFS_ILOCK_EXCL); zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); if ((zero_off + zero_len) > offset) zero_len = offset - zero_off; error = xfs_iozero(ip, zero_off, zero_len); if (error) { goto out_lock; } start_zero_fsb = imap.br_startoff + imap.br_blockcount; ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); xfs_ilock(ip, XFS_ILOCK_EXCL); } return 0; out_lock: xfs_ilock(ip, XFS_ILOCK_EXCL); ASSERT(error >= 0); return error; }
int xfs_zero_eof( xfs_inode_t *ip, xfs_off_t offset, xfs_fsize_t isize) { xfs_mount_t *mp = ip->i_mount; xfs_fileoff_t start_zero_fsb; xfs_fileoff_t end_zero_fsb; xfs_fileoff_t zero_count_fsb; xfs_fileoff_t last_fsb; xfs_fileoff_t zero_off; xfs_fsize_t zero_len; int nimaps; int error = 0; xfs_bmbt_irec_t imap; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); ASSERT(offset > isize); error = xfs_zero_last_block(ip, offset, isize); if (error) { ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); return error; } last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); if (last_fsb == end_zero_fsb) { return 0; } ASSERT(start_zero_fsb <= end_zero_fsb); while (start_zero_fsb <= end_zero_fsb) { nimaps = 1; zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb, &imap, &nimaps, 0); if (error) { ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); return error; } ASSERT(nimaps > 0); if (imap.br_state == XFS_EXT_UNWRITTEN || imap.br_startblock == HOLESTARTBLOCK) { start_zero_fsb = imap.br_startoff + imap.br_blockcount; ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); continue; } xfs_iunlock(ip, XFS_ILOCK_EXCL); zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); if ((zero_off + zero_len) > offset) zero_len = offset - zero_off; error = xfs_iozero(ip, zero_off, zero_len); if (error) { goto out_lock; } start_zero_fsb = imap.br_startoff + imap.br_blockcount; ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); xfs_ilock(ip, XFS_ILOCK_EXCL); } return 0; out_lock: xfs_ilock(ip, XFS_ILOCK_EXCL); ASSERT(error >= 0); return error; }
STATIC loff_t xfs_seek_data( struct file *file, loff_t start, u32 type) { struct inode *inode = file->f_mapping->host; struct xfs_inode *ip = XFS_I(inode); struct xfs_mount *mp = ip->i_mount; struct xfs_bmbt_irec map[2]; int nmap = 2; loff_t uninitialized_var(offset); xfs_fsize_t isize; xfs_fileoff_t fsbno; xfs_filblks_t end; uint lock; int error; lock = xfs_ilock_map_shared(ip); isize = i_size_read(inode); if (start >= isize) { error = ENXIO; goto out_unlock; } fsbno = XFS_B_TO_FSBT(mp, start); /* * Try to read extents from the first block indicated * by fsbno to the end block of the file. */ end = XFS_B_TO_FSB(mp, isize); error = xfs_bmapi_read(ip, fsbno, end - fsbno, map, &nmap, XFS_BMAPI_ENTIRE); if (error) goto out_unlock; /* * Treat unwritten extent as data extent since it might * contains dirty data in page cache. */ if (map[0].br_startblock != HOLESTARTBLOCK) { offset = max_t(loff_t, start, XFS_FSB_TO_B(mp, map[0].br_startoff)); } else { if (nmap == 1) { error = ENXIO; goto out_unlock; } offset = max_t(loff_t, start, XFS_FSB_TO_B(mp, map[1].br_startoff)); } if (offset != file->f_pos) file->f_pos = offset; out_unlock: xfs_iunlock_map_shared(ip, lock); if (error) return -error; return offset; }
/* * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a * caller supplied function for every chunk of dquots that we find. */ STATIC int xfs_qm_dqiterate( struct xfs_mount *mp, struct xfs_inode *qip, uint flags, struct list_head *buffer_list) { struct xfs_bmbt_irec *map; int i, nmaps; /* number of map entries */ int error; /* return value */ xfs_fileoff_t lblkno; xfs_filblks_t maxlblkcnt; xfs_dqid_t firstid; xfs_fsblock_t rablkno; xfs_filblks_t rablkcnt; error = 0; /* * This looks racy, but we can't keep an inode lock across a * trans_reserve. But, this gets called during quotacheck, and that * happens only at mount time which is single threaded. */ if (qip->i_d.di_nblocks == 0) return 0; map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP); lblkno = 0; maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); do { nmaps = XFS_DQITER_MAP_SIZE; /* * We aren't changing the inode itself. Just changing * some of its data. No new blocks are added here, and * the inode is never added to the transaction. */ xfs_ilock(qip, XFS_ILOCK_SHARED); error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno, map, &nmaps, 0); xfs_iunlock(qip, XFS_ILOCK_SHARED); if (error) break; ASSERT(nmaps <= XFS_DQITER_MAP_SIZE); for (i = 0; i < nmaps; i++) { ASSERT(map[i].br_startblock != DELAYSTARTBLOCK); ASSERT(map[i].br_blockcount); lblkno += map[i].br_blockcount; if (map[i].br_startblock == HOLESTARTBLOCK) continue; firstid = (xfs_dqid_t) map[i].br_startoff * mp->m_quotainfo->qi_dqperchunk; /* * Do a read-ahead on the next extent. */ if ((i+1 < nmaps) && (map[i+1].br_startblock != HOLESTARTBLOCK)) { rablkcnt = map[i+1].br_blockcount; rablkno = map[i+1].br_startblock; while (rablkcnt--) { xfs_buf_readahead(mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, rablkno), mp->m_quotainfo->qi_dqchunklen, NULL); rablkno++; } } /* * Iterate thru all the blks in the extent and * reset the counters of all the dquots inside them. */ error = xfs_qm_dqiter_bufs(mp, firstid, map[i].br_startblock, map[i].br_blockcount, flags, buffer_list); if (error) goto out; } } while (nmaps > 0); out: kmem_free(map); return error; }
/* * Look at all the extents for this logical region, * invalidate any buffers that are incore/in transactions. */ STATIC int xfs_attr3_leaf_freextent( struct xfs_trans **trans, struct xfs_inode *dp, xfs_dablk_t blkno, int blkcnt) { struct xfs_bmbt_irec map; struct xfs_buf *bp; xfs_dablk_t tblkno; xfs_daddr_t dblkno; int tblkcnt; int dblkcnt; int nmap; int error; /* * Roll through the "value", invalidating the attribute value's * blocks. */ tblkno = blkno; tblkcnt = blkcnt; while (tblkcnt > 0) { /* * Try to remember where we decided to put the value. */ nmap = 1; error = xfs_bmapi_read(dp, (xfs_fileoff_t)tblkno, tblkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); if (error) { return error; } ASSERT(nmap == 1); ASSERT(map.br_startblock != DELAYSTARTBLOCK); /* * If it's a hole, these are already unmapped * so there's nothing to invalidate. */ if (map.br_startblock != HOLESTARTBLOCK) { dblkno = XFS_FSB_TO_DADDR(dp->i_mount, map.br_startblock); dblkcnt = XFS_FSB_TO_BB(dp->i_mount, map.br_blockcount); bp = xfs_trans_get_buf(*trans, dp->i_mount->m_ddev_targp, dblkno, dblkcnt, 0); if (!bp) return -ENOMEM; xfs_trans_binval(*trans, bp); /* * Roll to next transaction. */ error = xfs_trans_roll(trans, dp); if (error) return error; } tblkno += map.br_blockcount; tblkcnt -= map.br_blockcount; } return 0; }
int xfs_free_file_space( struct xfs_inode *ip, xfs_off_t offset, xfs_off_t len) { int committed; int done; xfs_fileoff_t endoffset_fsb; int error; xfs_fsblock_t firstfsb; xfs_bmap_free_t free_list; xfs_bmbt_irec_t imap; xfs_off_t ioffset; xfs_extlen_t mod=0; xfs_mount_t *mp; int nimap; uint resblks; xfs_off_t rounding; int rt; xfs_fileoff_t startoffset_fsb; xfs_trans_t *tp; mp = ip->i_mount; trace_xfs_free_file_space(ip); error = xfs_qm_dqattach(ip, 0); if (error) return error; error = 0; if (len <= 0) /* if nothing being freed */ return error; rt = XFS_IS_REALTIME_INODE(ip); startoffset_fsb = XFS_B_TO_FSB(mp, offset); endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len); /* wait for the completion of any pending DIOs */ inode_dio_wait(VFS_I(ip)); rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE); ioffset = offset & ~(rounding - 1); error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping, ioffset, -1); if (error) goto out; truncate_pagecache_range(VFS_I(ip), ioffset, -1); /* * Need to zero the stuff we're not freeing, on disk. * If it's a realtime file & can't use unwritten extents then we * actually need to zero the extent edges. Otherwise xfs_bunmapi * will take care of it for us. */ if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) { nimap = 1; error = xfs_bmapi_read(ip, startoffset_fsb, 1, &imap, &nimap, 0); if (error) goto out; ASSERT(nimap == 0 || nimap == 1); if (nimap && imap.br_startblock != HOLESTARTBLOCK) { xfs_daddr_t block; ASSERT(imap.br_startblock != DELAYSTARTBLOCK); block = imap.br_startblock; mod = do_div(block, mp->m_sb.sb_rextsize); if (mod) startoffset_fsb += mp->m_sb.sb_rextsize - mod; } nimap = 1; error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1, &imap, &nimap, 0); if (error) goto out; ASSERT(nimap == 0 || nimap == 1); if (nimap && imap.br_startblock != HOLESTARTBLOCK) { ASSERT(imap.br_startblock != DELAYSTARTBLOCK); mod++; if (mod && (mod != mp->m_sb.sb_rextsize)) endoffset_fsb -= mod; } } if ((done = (endoffset_fsb <= startoffset_fsb))) /* * One contiguous piece to clear */ error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); else { /* * Some full blocks, possibly two pieces to clear */ if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) error = xfs_zero_remaining_bytes(ip, offset, XFS_FSB_TO_B(mp, startoffset_fsb) - 1); if (!error && XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) error = xfs_zero_remaining_bytes(ip, XFS_FSB_TO_B(mp, endoffset_fsb), offset + len - 1); } /* * free file space until done or until there is an error */ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); while (!error && !done) { /* * allocate and setup the transaction. Allow this * transaction to dip into the reserve blocks to ensure * the freeing of the space succeeds at ENOSPC. */ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); tp->t_flags |= XFS_TRANS_RESERVE; error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, resblks, 0); /* * check for running out of space */ if (error) { /* * Free the transaction structure. */ ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); break; } xfs_ilock(ip, XFS_ILOCK_EXCL); error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, ip->i_gdquot, ip->i_pdquot, resblks, 0, XFS_QMOPT_RES_REGBLKS); if (error) goto error1; xfs_trans_ijoin(tp, ip, 0); /* * issue the bunmapi() call to free the blocks */ xfs_bmap_init(&free_list, &firstfsb); error = xfs_bunmapi(tp, ip, startoffset_fsb, endoffset_fsb - startoffset_fsb, 0, 2, &firstfsb, &free_list, &done); 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); xfs_iunlock(ip, XFS_ILOCK_EXCL); } out: return error; error0: xfs_bmap_cancel(&free_list); error1: xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); xfs_iunlock(ip, XFS_ILOCK_EXCL); goto out; }
/* * Maps a dquot to the buffer containing its on-disk version. * This returns a ptr to the buffer containing the on-disk dquot * in the bpp param, and a ptr to the on-disk dquot within that buffer */ STATIC int xfs_qm_dqtobp( xfs_trans_t **tpp, xfs_dquot_t *dqp, xfs_disk_dquot_t **O_ddpp, xfs_buf_t **O_bpp, uint flags) { xfs_bmbt_irec_t map; int nmaps = 1, error; xfs_buf_t *bp; xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp); xfs_mount_t *mp = dqp->q_mount; xfs_disk_dquot_t *ddq; xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id); xfs_trans_t *tp = (tpp ? *tpp : NULL); dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; xfs_ilock(quotip, XFS_ILOCK_SHARED); if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) { /* * Return if this type of quotas is turned off while we * didn't have the quota inode lock. */ xfs_iunlock(quotip, XFS_ILOCK_SHARED); return ESRCH; } /* * Find the block map; no allocations yet */ error = xfs_bmapi_read(quotip, dqp->q_fileoffset, XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0); xfs_iunlock(quotip, XFS_ILOCK_SHARED); if (error) return error; ASSERT(nmaps == 1); ASSERT(map.br_blockcount == 1); /* * Offset of dquot in the (fixed sized) dquot chunk. */ dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * sizeof(xfs_dqblk_t); ASSERT(map.br_startblock != DELAYSTARTBLOCK); if (map.br_startblock == HOLESTARTBLOCK) { /* * We don't allocate unless we're asked to */ if (!(flags & XFS_QMOPT_DQALLOC)) return ENOENT; ASSERT(tp); error = xfs_qm_dqalloc(tpp, mp, dqp, quotip, dqp->q_fileoffset, &bp); if (error) return error; tp = *tpp; } else { trace_xfs_dqtobp_read(dqp); /* * store the blkno etc so that we don't have to do the * mapping all the time */ dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno, mp->m_quotainfo->qi_dqchunklen, 0, &bp); if (error || !bp) return XFS_ERROR(error); } ASSERT(xfs_buf_islocked(bp)); /* * calculate the location of the dquot inside the buffer. */ ddq = bp->b_addr + dqp->q_bufoffset; /* * A simple sanity check in case we got a corrupted dquot... */ error = xfs_qm_dqcheck(mp, ddq, id, dqp->dq_flags & XFS_DQ_ALLTYPES, flags & (XFS_QMOPT_DQREPAIR|XFS_QMOPT_DOWARN), "dqtobp"); if (error) { if (!(flags & XFS_QMOPT_DQREPAIR)) { xfs_trans_brelse(tp, bp); return XFS_ERROR(EIO); } } *O_bpp = bp; *O_ddpp = ddq; return (0); }
/* * dead simple method of punching delalyed allocation blocks from a range in * the inode. Walks a block at a time so will be slow, but is only executed in * rare error cases so the overhead is not critical. This will always punch out * both the start and end blocks, even if the ranges only partially overlap * them, so it is up to the caller to ensure that partial blocks are not * passed in. */ int xfs_bmap_punch_delalloc_range( struct xfs_inode *ip, xfs_fileoff_t start_fsb, xfs_fileoff_t length) { xfs_fileoff_t remaining = length; int error = 0; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); do { int done; xfs_bmbt_irec_t imap; int nimaps = 1; xfs_fsblock_t firstblock; xfs_bmap_free_t flist; /* * Map the range first and check that it is a delalloc extent * before trying to unmap the range. Otherwise we will be * trying to remove a real extent (which requires a * transaction) or a hole, which is probably a bad idea... */ error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps, XFS_BMAPI_ENTIRE); if (error) { /* something screwed, just bail */ if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { xfs_alert(ip->i_mount, "Failed delalloc mapping lookup ino %lld fsb %lld.", ip->i_ino, start_fsb); } break; } if (!nimaps) { /* nothing there */ goto next_block; } if (imap.br_startblock != DELAYSTARTBLOCK) { /* been converted, ignore */ goto next_block; } WARN_ON(imap.br_blockcount == 0); /* * Note: while we initialise the firstblock/flist pair, they * should never be used because blocks should never be * allocated or freed for a delalloc extent and hence we need * don't cancel or finish them after the xfs_bunmapi() call. */ xfs_bmap_init(&flist, &firstblock); error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock, &flist, &done); if (error) break; ASSERT(!flist.xbf_count && !flist.xbf_first); next_block: start_fsb++; remaining--; } while(remaining > 0); return error; }
/* * The user wants to preemptively CoW all shared blocks in this file, * which enables us to turn off the reflink flag. Iterate all * extents which are not prealloc/delalloc to see which ranges are * mentioned in the refcount tree, then read those blocks into the * pagecache, dirty them, fsync them back out, and then we can update * the inode flag. What happens if we run out of memory? :) */ STATIC int xfs_reflink_dirty_extents( struct xfs_inode *ip, xfs_fileoff_t fbno, xfs_filblks_t end, xfs_off_t isize) { struct xfs_mount *mp = ip->i_mount; xfs_agnumber_t agno; xfs_agblock_t agbno; xfs_extlen_t aglen; xfs_agblock_t rbno; xfs_extlen_t rlen; xfs_off_t fpos; xfs_off_t flen; struct xfs_bmbt_irec map[2]; int nmaps; int error = 0; while (end - fbno > 0) { nmaps = 1; /* * Look for extents in the file. Skip holes, delalloc, or * unwritten extents; they can't be reflinked. */ error = xfs_bmapi_read(ip, fbno, end - fbno, map, &nmaps, 0); if (error) goto out; if (nmaps == 0) break; if (!xfs_bmap_is_real_extent(&map[0])) goto next; map[1] = map[0]; while (map[1].br_blockcount) { agno = XFS_FSB_TO_AGNO(mp, map[1].br_startblock); agbno = XFS_FSB_TO_AGBNO(mp, map[1].br_startblock); aglen = map[1].br_blockcount; error = xfs_reflink_find_shared(mp, NULL, agno, agbno, aglen, &rbno, &rlen, true); if (error) goto out; if (rbno == NULLAGBLOCK) break; /* Dirty the pages */ xfs_iunlock(ip, XFS_ILOCK_EXCL); fpos = XFS_FSB_TO_B(mp, map[1].br_startoff + (rbno - agbno)); flen = XFS_FSB_TO_B(mp, rlen); if (fpos + flen > isize) flen = isize - fpos; error = iomap_file_dirty(VFS_I(ip), fpos, flen, &xfs_iomap_ops); xfs_ilock(ip, XFS_ILOCK_EXCL); if (error) goto out; map[1].br_blockcount -= (rbno - agbno + rlen); map[1].br_startoff += (rbno - agbno + rlen); map[1].br_startblock += (rbno - agbno + rlen); } next: fbno = map[0].br_startoff + map[0].br_blockcount; } out: return error; }
/* * Free a symlink that has blocks associated with it. */ STATIC int xfs_inactive_symlink_rmt( struct xfs_inode *ip) { xfs_buf_t *bp; int committed; int done; int error; xfs_fsblock_t first_block; xfs_bmap_free_t free_list; int i; xfs_mount_t *mp; xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS]; int nmaps; int size; xfs_trans_t *tp; mp = ip->i_mount; ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS); /* * We're freeing a symlink that has some * blocks allocated to it. Free the * blocks here. We know that we've got * either 1 or 2 extents and that we can * free them all in one bunmapi call. */ ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); if (error) { xfs_trans_cancel(tp, 0); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); /* * Lock the inode, fix the size, and join it to the transaction. * Hold it so in the normal path, we still have it locked for * the second transaction. In the error paths we need it * held so the cancel won't rele it, see below. */ size = (int)ip->i_d.di_size; ip->i_d.di_size = 0; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); /* * Find the block(s) so we can inval and unmap them. */ done = 0; xfs_bmap_init(&free_list, &first_block); nmaps = ARRAY_SIZE(mval); error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size), mval, &nmaps, 0); if (error) goto error_trans_cancel; /* * Invalidate the block(s). No validation is done. */ for (i = 0; i < nmaps; i++) { bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); if (!bp) { error = ENOMEM; goto error_bmap_cancel; } xfs_trans_binval(tp, bp); } /* * Unmap the dead block(s) to the free_list. */ error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps, &first_block, &free_list, &done); if (error) goto error_bmap_cancel; ASSERT(done); /* * Commit the first transaction. This logs the EFI and the inode. */ error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) goto error_bmap_cancel; /* * The transaction must have been committed, since there were * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. * The new tp has the extent freeing and EFDs. */ ASSERT(committed); /* * The first xact was committed, so add the inode to the new one. * Mark it dirty so it will be logged and moved forward in the log as * part of every commit. */ xfs_trans_ijoin(tp, ip, 0); xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); /* * Commit the transaction containing extent freeing and EFDs. */ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); if (error) { ASSERT(XFS_FORCED_SHUTDOWN(mp)); goto error_unlock; } /* * Remove the memory for extent descriptions (just bookkeeping). */ if (ip->i_df.if_bytes) xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); ASSERT(ip->i_df.if_bytes == 0); xfs_iunlock(ip, XFS_ILOCK_EXCL); return 0; error_bmap_cancel: xfs_bmap_cancel(&free_list); error_trans_cancel: xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); error_unlock: xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; }
/* * Iteratively remap one file's extents (and holes) to another's. */ int xfs_reflink_remap_blocks( struct xfs_inode *src, loff_t pos_in, struct xfs_inode *dest, loff_t pos_out, loff_t remap_len, loff_t *remapped) { struct xfs_bmbt_irec imap; xfs_fileoff_t srcoff; xfs_fileoff_t destoff; xfs_filblks_t len; xfs_filblks_t range_len; xfs_filblks_t remapped_len = 0; xfs_off_t new_isize = pos_out + remap_len; int nimaps; int error = 0; destoff = XFS_B_TO_FSBT(src->i_mount, pos_out); srcoff = XFS_B_TO_FSBT(src->i_mount, pos_in); len = XFS_B_TO_FSB(src->i_mount, remap_len); /* drange = (destoff, destoff + len); srange = (srcoff, srcoff + len) */ while (len) { uint lock_mode; trace_xfs_reflink_remap_blocks_loop(src, srcoff, len, dest, destoff); /* Read extent from the source file */ nimaps = 1; lock_mode = xfs_ilock_data_map_shared(src); error = xfs_bmapi_read(src, srcoff, len, &imap, &nimaps, 0); xfs_iunlock(src, lock_mode); if (error) break; ASSERT(nimaps == 1); trace_xfs_reflink_remap_imap(src, srcoff, len, XFS_DATA_FORK, &imap); /* Translate imap into the destination file. */ range_len = imap.br_startoff + imap.br_blockcount - srcoff; imap.br_startoff += destoff - srcoff; /* Clear dest from destoff to the end of imap and map it in. */ error = xfs_reflink_remap_extent(dest, &imap, destoff, new_isize); if (error) break; if (fatal_signal_pending(current)) { error = -EINTR; break; } /* Advance drange/srange */ srcoff += range_len; destoff += range_len; len -= range_len; remapped_len += range_len; } if (error) trace_xfs_reflink_remap_blocks_error(dest, error, _RET_IP_); *remapped = min_t(loff_t, remap_len, XFS_FSB_TO_B(src->i_mount, remapped_len)); return error; }