// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. */ #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_bit.h" #include "xfs_mount.h" #include "xfs_inode.h" #include "xfs_bmap.h" #include "xfs_bmap_btree.h" #include "xfs_bmap_util.h" #include "xfs_trans.h" #include "xfs_trans_space.h" #include "xfs_icache.h" #include "xfs_rtalloc.h" #include "xfs_sb.h" #include "xfs_rtbitmap.h" #include "xfs_quota.h" /* * Return whether there are any free extents in the size range given * by low and high, for the bitmap block bbno. */ STATIC int xfs_rtany_summary( struct xfs_rtalloc_args *args, int low, /* low log2 extent size */ int high, /* high log2 extent size */ xfs_fileoff_t bbno, /* bitmap block number */ int *maxlog) /* out: max log2 extent size free */ { struct xfs_mount *mp = args->mp; int error; int log; /* loop counter, log2 of ext. size */ xfs_suminfo_t sum; /* summary data */ /* There are no extents at levels >= m_rsum_cache[bbno]. */ if (mp->m_rsum_cache) { high = min(high, mp->m_rsum_cache[bbno] - 1); if (low > high) { *maxlog = -1; return 0; } } /* * Loop over logs of extent sizes. */ for (log = high; log >= low; log--) { /* * Get one summary datum. */ error = xfs_rtget_summary(args, log, bbno, &sum); if (error) { return error; } /* * If there are any, return success. */ if (sum) { *maxlog = log; goto out; } } /* * Found nothing, return failure. */ *maxlog = -1; out: /* There were no extents at levels > log. */ if (mp->m_rsum_cache && log + 1 < mp->m_rsum_cache[bbno]) mp->m_rsum_cache[bbno] = log + 1; return 0; } /* * Copy and transform the summary file, given the old and new * parameters in the mount structures. */ STATIC int xfs_rtcopy_summary( struct xfs_rtalloc_args *oargs, struct xfs_rtalloc_args *nargs) { xfs_fileoff_t bbno; /* bitmap block number */ int error; int log; /* summary level number (log length) */ xfs_suminfo_t sum; /* summary data */ for (log = oargs->mp->m_rsumlevels - 1; log >= 0; log--) { for (bbno = oargs->mp->m_sb.sb_rbmblocks - 1; (xfs_srtblock_t)bbno >= 0; bbno--) { error = xfs_rtget_summary(oargs, log, bbno, &sum); if (error) goto out; if (sum == 0) continue; error = xfs_rtmodify_summary(oargs, log, bbno, -sum); if (error) goto out; error = xfs_rtmodify_summary(nargs, log, bbno, sum); if (error) goto out; ASSERT(sum > 0); } } error = 0; out: xfs_rtbuf_cache_relse(oargs); return 0; } /* * Mark an extent specified by start and len allocated. * Updates all the summary information as well as the bitmap. */ STATIC int xfs_rtallocate_range( struct xfs_rtalloc_args *args, xfs_rtxnum_t start, /* start rtext to allocate */ xfs_rtxlen_t len) /* in/out: summary block number */ { struct xfs_mount *mp = args->mp; xfs_rtxnum_t end; /* end of the allocated rtext */ int error; xfs_rtxnum_t postblock = 0; /* first rtext allocated > end */ xfs_rtxnum_t preblock = 0; /* first rtext allocated < start */ end = start + len - 1; /* * Assume we're allocating out of the middle of a free extent. * We need to find the beginning and end of the extent so we can * properly update the summary. */ error = xfs_rtfind_back(args, start, 0, &preblock); if (error) return error; /* * Find the next allocated block (end of free extent). */ error = xfs_rtfind_forw(args, end, mp->m_sb.sb_rextents - 1, &postblock); if (error) return error; /* * Decrement the summary information corresponding to the entire * (old) free extent. */ error = xfs_rtmodify_summary(args, xfs_highbit64(postblock + 1 - preblock), xfs_rtx_to_rbmblock(mp, preblock), -1); if (error) return error; /* * If there are blocks not being allocated at the front of the * old extent, add summary data for them to be free. */ if (preblock < start) { error = xfs_rtmodify_summary(args, xfs_highbit64(start - preblock), xfs_rtx_to_rbmblock(mp, preblock), 1); if (error) return error; } /* * If there are blocks not being allocated at the end of the * old extent, add summary data for them to be free. */ if (postblock > end) { error = xfs_rtmodify_summary(args, xfs_highbit64(postblock - end), xfs_rtx_to_rbmblock(mp, end + 1), 1); if (error) return error; } /* * Modify the bitmap to mark this extent allocated. */ return xfs_rtmodify_range(args, start, len, 0); } /* * Make sure we don't run off the end of the rt volume. Be careful that * adjusting maxlen downwards doesn't cause us to fail the alignment checks. */ static inline xfs_rtxlen_t xfs_rtallocate_clamp_len( struct xfs_mount *mp, xfs_rtxnum_t startrtx, xfs_rtxlen_t rtxlen, xfs_rtxlen_t prod) { xfs_rtxlen_t ret; ret = min(mp->m_sb.sb_rextents, startrtx + rtxlen) - startrtx; return rounddown(ret, prod); } /* * Attempt to allocate an extent minlen<=len<=maxlen starting from * bitmap block bbno. If we don't get maxlen then use prod to trim * the length, if given. Returns error; returns starting block in *rtx. * The lengths are all in rtextents. */ STATIC int xfs_rtallocate_extent_block( struct xfs_rtalloc_args *args, xfs_fileoff_t bbno, /* bitmap block number */ xfs_rtxlen_t minlen, /* minimum length to allocate */ xfs_rtxlen_t maxlen, /* maximum length to allocate */ xfs_rtxlen_t *len, /* out: actual length allocated */ xfs_rtxnum_t *nextp, /* out: next rtext to try */ xfs_rtxlen_t prod, /* extent product factor */ xfs_rtxnum_t *rtx) /* out: start rtext allocated */ { struct xfs_mount *mp = args->mp; xfs_rtxnum_t besti; /* best rtext found so far */ xfs_rtxnum_t bestlen;/* best length found so far */ xfs_rtxnum_t end; /* last rtext in chunk */ int error; xfs_rtxnum_t i; /* current rtext trying */ xfs_rtxnum_t next; /* next rtext to try */ int stat; /* status from internal calls */ /* * Loop over all the extents starting in this bitmap block, * looking for one that's long enough. */ for (i = xfs_rbmblock_to_rtx(mp, bbno), besti = -1, bestlen = 0, end = xfs_rbmblock_to_rtx(mp, bbno + 1) - 1; i <= end; i++) { /* Make sure we don't scan off the end of the rt volume. */ maxlen = xfs_rtallocate_clamp_len(mp, i, maxlen, prod); /* * See if there's a free extent of maxlen starting at i. * If it's not so then next will contain the first non-free. */ error = xfs_rtcheck_range(args, i, maxlen, 1, &next, &stat); if (error) return error; if (stat) { /* * i for maxlen is all free, allocate and return that. */ bestlen = maxlen; besti = i; goto allocate; } /* * In the case where we have a variable-sized allocation * request, figure out how big this free piece is, * and if it's big enough for the minimum, and the best * so far, remember it. */ if (minlen < maxlen) { xfs_rtxnum_t thislen; /* this extent size */ thislen = next - i; if (thislen >= minlen && thislen > bestlen) { besti = i; bestlen = thislen; } } /* * If not done yet, find the start of the next free space. */ if (next >= end) break; error = xfs_rtfind_forw(args, next, end, &i); if (error) return error; } /* * Searched the whole thing & didn't find a maxlen free extent. */ if (minlen > maxlen || besti == -1) { /* * Allocation failed. Set *nextp to the next block to try. */ *nextp = next; return -ENOSPC; } /* * If size should be a multiple of prod, make that so. */ if (prod > 1) { xfs_rtxlen_t p; /* amount to trim length by */ div_u64_rem(bestlen, prod, &p); if (p) bestlen -= p; } /* * Allocate besti for bestlen & return that. */ allocate: error = xfs_rtallocate_range(args, besti, bestlen); if (error) return error; *len = bestlen; *rtx = besti; return 0; } /* * Allocate an extent of length minlen<=len<=maxlen, starting at block * bno. If we don't get maxlen then use prod to trim the length, if given. * Returns error; returns starting block in *rtx. * The lengths are all in rtextents. */ STATIC int xfs_rtallocate_extent_exact( struct xfs_rtalloc_args *args, xfs_rtxnum_t start, /* starting rtext number to allocate */ xfs_rtxlen_t minlen, /* minimum length to allocate */ xfs_rtxlen_t maxlen, /* maximum length to allocate */ xfs_rtxlen_t *len, /* out: actual length allocated */ xfs_rtxlen_t prod, /* extent product factor */ xfs_rtxnum_t *rtx) /* out: start rtext allocated */ { int error; xfs_rtxlen_t i; /* extent length trimmed due to prod */ int isfree; /* extent is free */ xfs_rtxnum_t next; /* next rtext to try (dummy) */ ASSERT(minlen % prod == 0); ASSERT(maxlen % prod == 0); /* * Check if the range in question (for maxlen) is free. */ error = xfs_rtcheck_range(args, start, maxlen, 1, &next, &isfree); if (error) return error; if (!isfree) { /* * If not, allocate what there is, if it's at least minlen. */ maxlen = next - start; if (maxlen < minlen) return -ENOSPC; /* * Trim off tail of extent, if prod is specified. */ if (prod > 1 && (i = maxlen % prod)) { maxlen -= i; if (maxlen < minlen) return -ENOSPC; } } /* * Allocate what we can and return it. */ error = xfs_rtallocate_range(args, start, maxlen); if (error) return error; *len = maxlen; *rtx = start; return 0; } /* * Allocate an extent of length minlen<=len<=maxlen, starting as near * to start as possible. If we don't get maxlen then use prod to trim * the length, if given. The lengths are all in rtextents. */ STATIC int xfs_rtallocate_extent_near( struct xfs_rtalloc_args *args, xfs_rtxnum_t start, /* starting rtext number to allocate */ xfs_rtxlen_t minlen, /* minimum length to allocate */ xfs_rtxlen_t maxlen, /* maximum length to allocate */ xfs_rtxlen_t *len, /* out: actual length allocated */ xfs_rtxlen_t prod, /* extent product factor */ xfs_rtxnum_t *rtx) /* out: start rtext allocated */ { struct xfs_mount *mp = args->mp; int maxlog; /* max useful extent from summary */ xfs_fileoff_t bbno; /* bitmap block number */ int error; int i; /* bitmap block offset (loop control) */ int j; /* secondary loop control */ int log2len; /* log2 of minlen */ xfs_rtxnum_t n; /* next rtext to try */ ASSERT(minlen % prod == 0); ASSERT(maxlen % prod == 0); /* * If the block number given is off the end, silently set it to * the last block. */ if (start >= mp->m_sb.sb_rextents) start = mp->m_sb.sb_rextents - 1; /* Make sure we don't run off the end of the rt volume. */ maxlen = xfs_rtallocate_clamp_len(mp, start, maxlen, prod); if (maxlen < minlen) return -ENOSPC; /* * Try the exact allocation first. */ error = xfs_rtallocate_extent_exact(args, start, minlen, maxlen, len, prod, rtx); if (error != -ENOSPC) return error; bbno = xfs_rtx_to_rbmblock(mp, start); i = 0; j = -1; ASSERT(minlen != 0); log2len = xfs_highbit32(minlen); /* * Loop over all bitmap blocks (bbno + i is current block). */ for (;;) { /* * Get summary information of extents of all useful levels * starting in this bitmap block. */ error = xfs_rtany_summary(args, log2len, mp->m_rsumlevels - 1, bbno + i, &maxlog); if (error) return error; /* * If there are any useful extents starting here, try * allocating one. */ if (maxlog >= 0) { xfs_extlen_t maxavail = min_t(xfs_rtblock_t, maxlen, (1ULL << (maxlog + 1)) - 1); /* * On the positive side of the starting location. */ if (i >= 0) { /* * Try to allocate an extent starting in * this block. */ error = xfs_rtallocate_extent_block(args, bbno + i, minlen, maxavail, len, &n, prod, rtx); if (error != -ENOSPC) return error; } /* * On the negative side of the starting location. */ else { /* i < 0 */ int maxblocks; /* * Loop backwards to find the end of the extent * we found in the realtime summary. * * maxblocks is the maximum possible number of * bitmap blocks from the start of the extent * to the end of the extent. */ if (maxlog == 0) maxblocks = 0; else if (maxlog < mp->m_blkbit_log) maxblocks = 1; else maxblocks = 2 << (maxlog - mp->m_blkbit_log); /* * We need to check bbno + i + maxblocks down to * bbno + i. We already checked bbno down to * bbno + j + 1, so we don't need to check those * again. */ j = min(i + maxblocks, j); for (; j >= i; j--) { error = xfs_rtallocate_extent_block(args, bbno + j, minlen, maxavail, len, &n, prod, rtx); if (error != -ENOSPC) return error; } } } /* * Loop control. If we were on the positive side, and there's * still more blocks on the negative side, go there. */ if (i > 0 && (int)bbno - i >= 0) i = -i; /* * If positive, and no more negative, but there are more * positive, go there. */ else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1) i++; /* * If negative or 0 (just started), and there are positive * blocks to go, go there. The 0 case moves to block 1. */ else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1) i = 1 - i; /* * If negative or 0 and there are more negative blocks, * go there. */ else if (i <= 0 && (int)bbno + i > 0) i--; /* * Must be done. Return failure. */ else break; } return -ENOSPC; } static int xfs_rtalloc_sumlevel( struct xfs_rtalloc_args *args, int l, /* level number */ xfs_rtxlen_t minlen, /* minimum length to allocate */ xfs_rtxlen_t maxlen, /* maximum length to allocate */ xfs_rtxlen_t prod, /* extent product factor */ xfs_rtxlen_t *len, /* out: actual length allocated */ xfs_rtxnum_t *rtx) /* out: start rtext allocated */ { xfs_fileoff_t i; /* bitmap block number */ for (i = 0; i < args->mp->m_sb.sb_rbmblocks; i++) { xfs_suminfo_t sum; /* summary information for extents */ xfs_rtxnum_t n; /* next rtext to be tried */ int error; error = xfs_rtget_summary(args, l, i, &sum); if (error) return error; /* * Nothing there, on to the next block. */ if (!sum) continue; /* * Try allocating the extent. */ error = xfs_rtallocate_extent_block(args, i, minlen, maxlen, len, &n, prod, rtx); if (error != -ENOSPC) return error; /* * If the "next block to try" returned from the allocator is * beyond the next bitmap block, skip to that bitmap block. */ if (xfs_rtx_to_rbmblock(args->mp, n) > i + 1) i = xfs_rtx_to_rbmblock(args->mp, n) - 1; } return -ENOSPC; } /* * Allocate an extent of length minlen<=len<=maxlen, with no position * specified. If we don't get maxlen then use prod to trim * the length, if given. The lengths are all in rtextents. */ STATIC int xfs_rtallocate_extent_size( struct xfs_rtalloc_args *args, xfs_rtxlen_t minlen, /* minimum length to allocate */ xfs_rtxlen_t maxlen, /* maximum length to allocate */ xfs_rtxlen_t *len, /* out: actual length allocated */ xfs_rtxlen_t prod, /* extent product factor */ xfs_rtxnum_t *rtx) /* out: start rtext allocated */ { int error; int l; /* level number (loop control) */ ASSERT(minlen % prod == 0); ASSERT(maxlen % prod == 0); ASSERT(maxlen != 0); /* * Loop over all the levels starting with maxlen. * * At each level, look at all the bitmap blocks, to see if there are * extents starting there that are long enough (>= maxlen). * * Note, only on the initial level can the allocation fail if the * summary says there's an extent. */ for (l = xfs_highbit32(maxlen); l < args->mp->m_rsumlevels; l++) { error = xfs_rtalloc_sumlevel(args, l, minlen, maxlen, prod, len, rtx); if (error != -ENOSPC) return error; } /* * Didn't find any maxlen blocks. Try smaller ones, unless we are * looking for a fixed size extent. */ if (minlen > --maxlen) return -ENOSPC; ASSERT(minlen != 0); ASSERT(maxlen != 0); /* * Loop over sizes, from maxlen down to minlen. * * This time, when we do the allocations, allow smaller ones to succeed, * but make sure the specified minlen/maxlen are in the possible range * for this summary level. */ for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) { error = xfs_rtalloc_sumlevel(args, l, max_t(xfs_rtxlen_t, minlen, 1 << l), min_t(xfs_rtxlen_t, maxlen, (1 << (l + 1)) - 1), prod, len, rtx); if (error != -ENOSPC) return error; } return -ENOSPC; } /* * Allocate space to the bitmap or summary file, and zero it, for growfs. */ STATIC int xfs_growfs_rt_alloc( struct xfs_mount *mp, /* file system mount point */ xfs_extlen_t oblocks, /* old count of blocks */ xfs_extlen_t nblocks, /* new count of blocks */ struct xfs_inode *ip) /* inode (bitmap/summary) */ { xfs_fileoff_t bno; /* block number in file */ struct xfs_buf *bp; /* temporary buffer for zeroing */ xfs_daddr_t d; /* disk block address */ int error; /* error return value */ xfs_fsblock_t fsbno; /* filesystem block for bno */ struct xfs_bmbt_irec map; /* block map output */ int nmap; /* number of block maps */ int resblks; /* space reservation */ enum xfs_blft buf_type; struct xfs_trans *tp; if (ip == mp->m_rsumip) buf_type = XFS_BLFT_RTSUMMARY_BUF; else buf_type = XFS_BLFT_RTBITMAP_BUF; /* * Allocate space to the file, as necessary. */ while (oblocks < nblocks) { resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks); /* * Reserve space & log for one extent added to the file. */ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc, resblks, 0, 0, &tp); if (error) return error; /* * Lock the inode. */ xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK, XFS_IEXT_ADD_NOSPLIT_CNT); if (error == -EFBIG) error = xfs_iext_count_upgrade(tp, ip, XFS_IEXT_ADD_NOSPLIT_CNT); if (error) goto out_trans_cancel; /* * Allocate blocks to the bitmap file. */ nmap = 1; error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks, XFS_BMAPI_METADATA, 0, &map, &nmap); if (!error && nmap < 1) error = -ENOSPC; if (error) goto out_trans_cancel; /* * Free any blocks freed up in the transaction, then commit. */ error = xfs_trans_commit(tp); if (error) return error; /* * Now we need to clear the allocated blocks. * Do this one block per transaction, to keep it simple. */ for (bno = map.br_startoff, fsbno = map.br_startblock; bno < map.br_startoff + map.br_blockcount; bno++, fsbno++) { /* * Reserve log for one block zeroing. */ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero, 0, 0, 0, &tp); if (error) return error; /* * Lock the bitmap inode. */ xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); /* * Get a buffer for the block. */ d = XFS_FSB_TO_DADDR(mp, fsbno); error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, mp->m_bsize, 0, &bp); if (error) goto out_trans_cancel; xfs_trans_buf_set_type(tp, bp, buf_type); bp->b_ops = &xfs_rtbuf_ops; memset(bp->b_addr, 0, mp->m_sb.sb_blocksize); xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1); /* * Commit the transaction. */ error = xfs_trans_commit(tp); if (error) return error; } /* * Go on to the next extent, if any. */ oblocks = map.br_startoff + map.br_blockcount; } return 0; out_trans_cancel: xfs_trans_cancel(tp); return error; } static void xfs_alloc_rsum_cache( xfs_mount_t *mp, /* file system mount structure */ xfs_extlen_t rbmblocks) /* number of rt bitmap blocks */ { /* * The rsum cache is initialized to the maximum value, which is * trivially an upper bound on the maximum level with any free extents. * We can continue without the cache if it couldn't be allocated. */ mp->m_rsum_cache = kvmalloc(rbmblocks, GFP_KERNEL); if (mp->m_rsum_cache) memset(mp->m_rsum_cache, -1, rbmblocks); else xfs_warn(mp, "could not allocate realtime summary cache"); } /* * Visible (exported) functions. */ /* * Grow the realtime area of the filesystem. */ int xfs_growfs_rt( xfs_mount_t *mp, /* mount point for filesystem */ xfs_growfs_rt_t *in) /* growfs rt input struct */ { xfs_fileoff_t bmbno; /* bitmap block number */ struct xfs_buf *bp; /* temporary buffer */ int error; /* error return value */ xfs_mount_t *nmp; /* new (fake) mount structure */ xfs_rfsblock_t nrblocks; /* new number of realtime blocks */ xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */ xfs_rtxnum_t nrextents; /* new number of realtime extents */ uint8_t nrextslog; /* new log2 of sb_rextents */ xfs_extlen_t nrsumblocks; /* new number of summary blocks */ uint nrsumlevels; /* new rt summary levels */ uint nrsumsize; /* new size of rt summary, bytes */ xfs_sb_t *nsbp; /* new superblock */ xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */ xfs_extlen_t rsumblocks; /* current number of rt summary blks */ xfs_sb_t *sbp; /* old superblock */ uint8_t *rsum_cache; /* old summary cache */ sbp = &mp->m_sb; if (!capable(CAP_SYS_ADMIN)) return -EPERM; /* Needs to have been mounted with an rt device. */ if (!XFS_IS_REALTIME_MOUNT(mp)) return -EINVAL; /* * Mount should fail if the rt bitmap/summary files don't load, but * we'll check anyway. */ if (!mp->m_rbmip || !mp->m_rsumip) return -EINVAL; /* Shrink not supported. */ if (in->newblocks <= sbp->sb_rblocks) return -EINVAL; /* Can only change rt extent size when adding rt volume. */ if (sbp->sb_rblocks > 0 && in->extsize != sbp->sb_rextsize) return -EINVAL; /* Range check the extent size. */ if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE || XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE) return -EINVAL; /* Unsupported realtime features. */ if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp)) return -EOPNOTSUPP; nrblocks = in->newblocks; error = xfs_sb_validate_fsb_count(sbp, nrblocks); if (error) return error; /* * Read in the last block of the device, make sure it exists. */ error = xfs_buf_read_uncached(mp->m_rtdev_targp, XFS_FSB_TO_BB(mp, nrblocks - 1), XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL); if (error) return error; xfs_buf_relse(bp); /* * Calculate new parameters. These are the final values to be reached. */ nrextents = nrblocks; do_div(nrextents, in->extsize); if (!xfs_validate_rtextents(nrextents)) return -EINVAL; nrbmblocks = xfs_rtbitmap_blockcount(mp, nrextents); nrextslog = xfs_compute_rextslog(nrextents); nrsumlevels = nrextslog + 1; nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels, nrbmblocks); nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks); /* * New summary size can't be more than half the size of * the log. This prevents us from getting a log overflow, * since we'll log basically the whole summary file at once. */ if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1)) return -EINVAL; /* * Get the old block counts for bitmap and summary inodes. * These can't change since other growfs callers are locked out. */ rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_disk_size); rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_disk_size); /* * Allocate space to the bitmap and summary files, as necessary. */ error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip); if (error) return error; error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip); if (error) return error; rsum_cache = mp->m_rsum_cache; if (nrbmblocks != sbp->sb_rbmblocks) xfs_alloc_rsum_cache(mp, nrbmblocks); /* * Allocate a new (fake) mount/sb. */ nmp = kmem_alloc(sizeof(*nmp), 0); /* * Loop over the bitmap blocks. * We will do everything one bitmap block at a time. * Skip the current block if it is exactly full. * This also deals with the case where there were no rtextents before. */ for (bmbno = sbp->sb_rbmblocks - ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0); bmbno < nrbmblocks; bmbno++) { struct xfs_rtalloc_args args = { .mp = mp, }; struct xfs_rtalloc_args nargs = { .mp = nmp, }; struct xfs_trans *tp; xfs_rfsblock_t nrblocks_step; *nmp = *mp; nsbp = &nmp->m_sb; /* * Calculate new sb and mount fields for this round. */ nsbp->sb_rextsize = in->extsize; nmp->m_rtxblklog = -1; /* don't use shift or masking */ nsbp->sb_rbmblocks = bmbno + 1; nrblocks_step = (bmbno + 1) * NBBY * nsbp->sb_blocksize * nsbp->sb_rextsize; nsbp->sb_rblocks = min(nrblocks, nrblocks_step); nsbp->sb_rextents = xfs_rtb_to_rtx(nmp, nsbp->sb_rblocks); ASSERT(nsbp->sb_rextents != 0); nsbp->sb_rextslog = xfs_compute_rextslog(nsbp->sb_rextents); nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1; nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels, nsbp->sb_rbmblocks); nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks); /* recompute growfsrt reservation from new rsumsize */ xfs_trans_resv_calc(nmp, &nmp->m_resv); /* * Start a transaction, get the log reservation. */ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtfree, 0, 0, 0, &tp); if (error) break; args.tp = tp; nargs.tp = tp; /* * Lock out other callers by grabbing the bitmap inode lock. */ xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP); xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL); /* * Update the bitmap inode's size ondisk and incore. We need * to update the incore size so that inode inactivation won't * punch what it thinks are "posteof" blocks. */ mp->m_rbmip->i_disk_size = nsbp->sb_rbmblocks * nsbp->sb_blocksize; i_size_write(VFS_I(mp->m_rbmip), mp->m_rbmip->i_disk_size); xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE); /* * Get the summary inode into the transaction. */ xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM); xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL); /* * Update the summary inode's size. We need to update the * incore size so that inode inactivation won't punch what it * thinks are "posteof" blocks. */ mp->m_rsumip->i_disk_size = nmp->m_rsumsize; i_size_write(VFS_I(mp->m_rsumip), mp->m_rsumip->i_disk_size); xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE); /* * Copy summary data from old to new sizes. * Do this when the real size (not block-aligned) changes. */ if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks || mp->m_rsumlevels != nmp->m_rsumlevels) { error = xfs_rtcopy_summary(&args, &nargs); if (error) goto error_cancel; } /* * Update superblock fields. */ if (nsbp->sb_rextsize != sbp->sb_rextsize) xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE, nsbp->sb_rextsize - sbp->sb_rextsize); if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks) xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS, nsbp->sb_rbmblocks - sbp->sb_rbmblocks); if (nsbp->sb_rblocks != sbp->sb_rblocks) xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS, nsbp->sb_rblocks - sbp->sb_rblocks); if (nsbp->sb_rextents != sbp->sb_rextents) xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS, nsbp->sb_rextents - sbp->sb_rextents); if (nsbp->sb_rextslog != sbp->sb_rextslog) xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG, nsbp->sb_rextslog - sbp->sb_rextslog); /* * Free new extent. */ error = xfs_rtfree_range(&nargs, sbp->sb_rextents, nsbp->sb_rextents - sbp->sb_rextents); xfs_rtbuf_cache_relse(&nargs); if (error) { error_cancel: xfs_trans_cancel(tp); break; } /* * Mark more blocks free in the superblock. */ xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, nsbp->sb_rextents - sbp->sb_rextents); /* * Update mp values into the real mp structure. */ mp->m_rsumlevels = nrsumlevels; mp->m_rsumsize = nrsumsize; /* recompute growfsrt reservation from new rsumsize */ xfs_trans_resv_calc(mp, &mp->m_resv); error = xfs_trans_commit(tp); if (error) break; /* Ensure the mount RT feature flag is now set. */ mp->m_features |= XFS_FEAT_REALTIME; } if (error) goto out_free; /* Update secondary superblocks now the physical grow has completed */ error = xfs_update_secondary_sbs(mp); out_free: /* * Free the fake mp structure. */ kmem_free(nmp); /* * If we had to allocate a new rsum_cache, we either need to free the * old one (if we succeeded) or free the new one and restore the old one * (if there was an error). */ if (rsum_cache != mp->m_rsum_cache) { if (error) { kmem_free(mp->m_rsum_cache); mp->m_rsum_cache = rsum_cache; } else { kmem_free(rsum_cache); } } return error; } /* * Allocate an extent in the realtime subvolume, with the usual allocation * parameters. The length units are all in realtime extents, as is the * result block number. */ static int xfs_rtallocate_extent( struct xfs_trans *tp, xfs_rtxnum_t start, /* starting rtext number to allocate */ xfs_rtxlen_t minlen, /* minimum length to allocate */ xfs_rtxlen_t maxlen, /* maximum length to allocate */ xfs_rtxlen_t *len, /* out: actual length allocated */ int wasdel, /* was a delayed allocation extent */ xfs_rtxlen_t prod, /* extent product factor */ xfs_rtxnum_t *rtx) /* out: start rtext allocated */ { struct xfs_rtalloc_args args = { .mp = tp->t_mountp, .tp = tp, }; int error; /* error value */ ASSERT(xfs_isilocked(args.mp->m_rbmip, XFS_ILOCK_EXCL)); ASSERT(minlen > 0 && minlen <= maxlen); if (start == 0) { error = xfs_rtallocate_extent_size(&args, minlen, maxlen, len, prod, rtx); } else { error = xfs_rtallocate_extent_near(&args, start, minlen, maxlen, len, prod, rtx); } xfs_rtbuf_cache_relse(&args); if (error) return error; /* * If it worked, update the superblock. */ ASSERT(*len >= minlen && *len <= maxlen); if (wasdel) xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -(long)*len); else xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -(long)*len); return 0; } /* * Initialize realtime fields in the mount structure. */ int /* error */ xfs_rtmount_init( struct xfs_mount *mp) /* file system mount structure */ { struct xfs_buf *bp; /* buffer for last block of subvolume */ struct xfs_sb *sbp; /* filesystem superblock copy in mount */ xfs_daddr_t d; /* address of last block of subvolume */ unsigned int rsumblocks; int error; sbp = &mp->m_sb; if (sbp->sb_rblocks == 0) return 0; if (mp->m_rtdev_targp == NULL) { xfs_warn(mp, "Filesystem has a realtime volume, use rtdev=device option"); return -ENODEV; } mp->m_rsumlevels = sbp->sb_rextslog + 1; rsumblocks = xfs_rtsummary_blockcount(mp, mp->m_rsumlevels, mp->m_sb.sb_rbmblocks); mp->m_rsumsize = XFS_FSB_TO_B(mp, rsumblocks); mp->m_rbmip = mp->m_rsumip = NULL; /* * Check that the realtime section is an ok size. */ d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks); if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) { xfs_warn(mp, "realtime mount -- %llu != %llu", (unsigned long long) XFS_BB_TO_FSB(mp, d), (unsigned long long) mp->m_sb.sb_rblocks); return -EFBIG; } error = xfs_buf_read_uncached(mp->m_rtdev_targp, d - XFS_FSB_TO_BB(mp, 1), XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL); if (error) { xfs_warn(mp, "realtime device size check failed"); return error; } xfs_buf_relse(bp); return 0; } static int xfs_rtalloc_count_frextent( struct xfs_mount *mp, struct xfs_trans *tp, const struct xfs_rtalloc_rec *rec, void *priv) { uint64_t *valp = priv; *valp += rec->ar_extcount; return 0; } /* * Reinitialize the number of free realtime extents from the realtime bitmap. * Callers must ensure that there is no other activity in the filesystem. */ int xfs_rtalloc_reinit_frextents( struct xfs_mount *mp) { uint64_t val = 0; int error; xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent, &val); xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); if (error) return error; spin_lock(&mp->m_sb_lock); mp->m_sb.sb_frextents = val; spin_unlock(&mp->m_sb_lock); percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents); return 0; } /* * Read in the bmbt of an rt metadata inode so that we never have to load them * at runtime. This enables the use of shared ILOCKs for rtbitmap scans. Use * an empty transaction to avoid deadlocking on loops in the bmbt. */ static inline int xfs_rtmount_iread_extents( struct xfs_inode *ip, unsigned int lock_class) { struct xfs_trans *tp; int error; error = xfs_trans_alloc_empty(ip->i_mount, &tp); if (error) return error; xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class); error = xfs_iread_extents(tp, ip, XFS_DATA_FORK); if (error) goto out_unlock; if (xfs_inode_has_attr_fork(ip)) { error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK); if (error) goto out_unlock; } out_unlock: xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class); xfs_trans_cancel(tp); return error; } /* * Get the bitmap and summary inodes and the summary cache into the mount * structure at mount time. */ int /* error */ xfs_rtmount_inodes( xfs_mount_t *mp) /* file system mount structure */ { int error; /* error return value */ xfs_sb_t *sbp; sbp = &mp->m_sb; error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip); if (error) return error; ASSERT(mp->m_rbmip != NULL); error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP); if (error) goto out_rele_bitmap; error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip); if (error) goto out_rele_bitmap; ASSERT(mp->m_rsumip != NULL); error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM); if (error) goto out_rele_summary; xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks); return 0; out_rele_summary: xfs_irele(mp->m_rsumip); out_rele_bitmap: xfs_irele(mp->m_rbmip); return error; } void xfs_rtunmount_inodes( struct xfs_mount *mp) { kmem_free(mp->m_rsum_cache); if (mp->m_rbmip) xfs_irele(mp->m_rbmip); if (mp->m_rsumip) xfs_irele(mp->m_rsumip); } /* * Pick an extent for allocation at the start of a new realtime file. * Use the sequence number stored in the atime field of the bitmap inode. * Translate this to a fraction of the rtextents, and return the product * of rtextents and the fraction. * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ... */ static int xfs_rtpick_extent( xfs_mount_t *mp, /* file system mount point */ xfs_trans_t *tp, /* transaction pointer */ xfs_rtxlen_t len, /* allocation length (rtextents) */ xfs_rtxnum_t *pick) /* result rt extent */ { xfs_rtxnum_t b; /* result rtext */ int log2; /* log of sequence number */ uint64_t resid; /* residual after log removed */ uint64_t seq; /* sequence number of file creation */ struct timespec64 ts; /* timespec in inode */ ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL)); ts = inode_get_atime(VFS_I(mp->m_rbmip)); if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) { mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM; seq = 0; } else { seq = ts.tv_sec; } if ((log2 = xfs_highbit64(seq)) == -1) b = 0; else { resid = seq - (1ULL << log2); b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >> (log2 + 1); if (b >= mp->m_sb.sb_rextents) div64_u64_rem(b, mp->m_sb.sb_rextents, &b); if (b + len > mp->m_sb.sb_rextents) b = mp->m_sb.sb_rextents - len; } ts.tv_sec = seq + 1; inode_set_atime_to_ts(VFS_I(mp->m_rbmip), ts); xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE); *pick = b; return 0; } static void xfs_rtalloc_align_minmax( xfs_rtxlen_t *raminlen, xfs_rtxlen_t *ramaxlen, xfs_rtxlen_t *prod) { xfs_rtxlen_t newmaxlen = *ramaxlen; xfs_rtxlen_t newminlen = *raminlen; xfs_rtxlen_t slack; slack = newmaxlen % *prod; if (slack) newmaxlen -= slack; slack = newminlen % *prod; if (slack) newminlen += *prod - slack; /* * If adjusting for extent size hint alignment produces an invalid * min/max len combination, go ahead without it. */ if (newmaxlen < newminlen) { *prod = 1; return; } *ramaxlen = newmaxlen; *raminlen = newminlen; } int xfs_bmap_rtalloc( struct xfs_bmalloca *ap) { struct xfs_mount *mp = ap->ip->i_mount; xfs_fileoff_t orig_offset = ap->offset; xfs_rtxnum_t start; /* allocation hint rtextent no */ xfs_rtxnum_t rtx; /* actually allocated rtextent no */ xfs_rtxlen_t prod = 0; /* product factor for allocators */ xfs_extlen_t mod = 0; /* product factor for allocators */ xfs_rtxlen_t ralen = 0; /* realtime allocation length */ xfs_extlen_t align; /* minimum allocation alignment */ xfs_extlen_t orig_length = ap->length; xfs_extlen_t minlen = mp->m_sb.sb_rextsize; xfs_rtxlen_t raminlen; bool rtlocked = false; bool ignore_locality = false; int error; align = xfs_get_extsz_hint(ap->ip); retry: error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 1, ap->eof, 0, ap->conv, &ap->offset, &ap->length); if (error) return error; ASSERT(ap->length); ASSERT(xfs_extlen_to_rtxmod(mp, ap->length) == 0); /* * If we shifted the file offset downward to satisfy an extent size * hint, increase minlen by that amount so that the allocator won't * give us an allocation that's too short to cover at least one of the * blocks that the caller asked for. */ if (ap->offset != orig_offset) minlen += orig_offset - ap->offset; /* * Set ralen to be the actual requested length in rtextents. * * If the old value was close enough to XFS_BMBT_MAX_EXTLEN that * we rounded up to it, cut it back so it's valid again. * Note that if it's a really large request (bigger than * XFS_BMBT_MAX_EXTLEN), we don't hear about that number, and can't * adjust the starting point to match it. */ ralen = xfs_extlen_to_rtxlen(mp, min(ap->length, XFS_MAX_BMBT_EXTLEN)); raminlen = max_t(xfs_rtxlen_t, 1, xfs_extlen_to_rtxlen(mp, minlen)); /* * Lock out modifications to both the RT bitmap and summary inodes */ if (!rtlocked) { xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP); xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL); xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM); xfs_trans_ijoin(ap->tp, mp->m_rsumip, XFS_ILOCK_EXCL); rtlocked = true; } if (ignore_locality) { start = 0; } else if (xfs_bmap_adjacent(ap)) { start = xfs_rtb_to_rtx(mp, ap->blkno); } else if (ap->eof && ap->offset == 0) { /* * If it's an allocation to an empty file at offset 0, pick an * extent that will space things out in the rt area. */ error = xfs_rtpick_extent(mp, ap->tp, ralen, &start); if (error) return error; } else { start = 0; } /* * Only bother calculating a real prod factor if offset & length are * perfectly aligned, otherwise it will just get us in trouble. */ div_u64_rem(ap->offset, align, &mod); if (mod || ap->length % align) { prod = 1; } else { prod = xfs_extlen_to_rtxlen(mp, align); if (prod > 1) xfs_rtalloc_align_minmax(&raminlen, &ralen, &prod); } error = xfs_rtallocate_extent(ap->tp, start, raminlen, ralen, &ralen, ap->wasdel, prod, &rtx); if (error == -ENOSPC) { if (align > mp->m_sb.sb_rextsize) { /* * We previously enlarged the request length to try to * satisfy an extent size hint. The allocator didn't * return anything, so reset the parameters to the * original values and try again without alignment * criteria. */ ap->offset = orig_offset; ap->length = orig_length; minlen = align = mp->m_sb.sb_rextsize; goto retry; } if (!ignore_locality && start != 0) { /* * If we can't allocate near a specific rt extent, try * again without locality criteria. */ ignore_locality = true; goto retry; } ap->blkno = NULLFSBLOCK; ap->length = 0; return 0; } if (error) return error; ap->blkno = xfs_rtx_to_rtb(mp, rtx); ap->length = xfs_rtxlen_to_extlen(mp, ralen); xfs_bmap_alloc_account(ap); return 0; }