| /* |
| * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_types.h" |
| #include "xfs_bit.h" |
| #include "xfs_log.h" |
| #include "xfs_inum.h" |
| #include "xfs_trans.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_mount.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_alloc_btree.h" |
| #include "xfs_ialloc_btree.h" |
| #include "xfs_dinode.h" |
| #include "xfs_inode.h" |
| #include "xfs_btree.h" |
| #include "xfs_ialloc.h" |
| #include "xfs_alloc.h" |
| #include "xfs_rtalloc.h" |
| #include "xfs_error.h" |
| #include "xfs_bmap.h" |
| |
| |
| /* |
| * Allocation group level functions. |
| */ |
| static inline int |
| xfs_ialloc_cluster_alignment( |
| xfs_alloc_arg_t *args) |
| { |
| if (xfs_sb_version_hasalign(&args->mp->m_sb) && |
| args->mp->m_sb.sb_inoalignmt >= |
| XFS_B_TO_FSBT(args->mp, XFS_INODE_CLUSTER_SIZE(args->mp))) |
| return args->mp->m_sb.sb_inoalignmt; |
| return 1; |
| } |
| |
| /* |
| * Lookup a record by ino in the btree given by cur. |
| */ |
| int /* error */ |
| xfs_inobt_lookup( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_agino_t ino, /* starting inode of chunk */ |
| xfs_lookup_t dir, /* <=, >=, == */ |
| int *stat) /* success/failure */ |
| { |
| cur->bc_rec.i.ir_startino = ino; |
| cur->bc_rec.i.ir_freecount = 0; |
| cur->bc_rec.i.ir_free = 0; |
| return xfs_btree_lookup(cur, dir, stat); |
| } |
| |
| /* |
| * Update the record referred to by cur to the value given. |
| * This either works (return 0) or gets an EFSCORRUPTED error. |
| */ |
| STATIC int /* error */ |
| xfs_inobt_update( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_inobt_rec_incore_t *irec) /* btree record */ |
| { |
| union xfs_btree_rec rec; |
| |
| rec.inobt.ir_startino = cpu_to_be32(irec->ir_startino); |
| rec.inobt.ir_freecount = cpu_to_be32(irec->ir_freecount); |
| rec.inobt.ir_free = cpu_to_be64(irec->ir_free); |
| return xfs_btree_update(cur, &rec); |
| } |
| |
| /* |
| * Get the data from the pointed-to record. |
| */ |
| int /* error */ |
| xfs_inobt_get_rec( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_inobt_rec_incore_t *irec, /* btree record */ |
| int *stat) /* output: success/failure */ |
| { |
| union xfs_btree_rec *rec; |
| int error; |
| |
| error = xfs_btree_get_rec(cur, &rec, stat); |
| if (!error && *stat == 1) { |
| irec->ir_startino = be32_to_cpu(rec->inobt.ir_startino); |
| irec->ir_freecount = be32_to_cpu(rec->inobt.ir_freecount); |
| irec->ir_free = be64_to_cpu(rec->inobt.ir_free); |
| } |
| return error; |
| } |
| |
| /* |
| * Verify that the number of free inodes in the AGI is correct. |
| */ |
| #ifdef DEBUG |
| STATIC int |
| xfs_check_agi_freecount( |
| struct xfs_btree_cur *cur, |
| struct xfs_agi *agi) |
| { |
| if (cur->bc_nlevels == 1) { |
| xfs_inobt_rec_incore_t rec; |
| int freecount = 0; |
| int error; |
| int i; |
| |
| error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &i); |
| if (error) |
| return error; |
| |
| do { |
| error = xfs_inobt_get_rec(cur, &rec, &i); |
| if (error) |
| return error; |
| |
| if (i) { |
| freecount += rec.ir_freecount; |
| error = xfs_btree_increment(cur, 0, &i); |
| if (error) |
| return error; |
| } |
| } while (i == 1); |
| |
| if (!XFS_FORCED_SHUTDOWN(cur->bc_mp)) |
| ASSERT(freecount == be32_to_cpu(agi->agi_freecount)); |
| } |
| return 0; |
| } |
| #else |
| #define xfs_check_agi_freecount(cur, agi) 0 |
| #endif |
| |
| /* |
| * Initialise a new set of inodes. |
| */ |
| STATIC int |
| xfs_ialloc_inode_init( |
| struct xfs_mount *mp, |
| struct xfs_trans *tp, |
| xfs_agnumber_t agno, |
| xfs_agblock_t agbno, |
| xfs_agblock_t length, |
| unsigned int gen) |
| { |
| struct xfs_buf *fbuf; |
| struct xfs_dinode *free; |
| int blks_per_cluster, nbufs, ninodes; |
| int version; |
| int i, j; |
| xfs_daddr_t d; |
| |
| /* |
| * Loop over the new block(s), filling in the inodes. |
| * For small block sizes, manipulate the inodes in buffers |
| * which are multiples of the blocks size. |
| */ |
| if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) { |
| blks_per_cluster = 1; |
| nbufs = length; |
| ninodes = mp->m_sb.sb_inopblock; |
| } else { |
| blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) / |
| mp->m_sb.sb_blocksize; |
| nbufs = length / blks_per_cluster; |
| ninodes = blks_per_cluster * mp->m_sb.sb_inopblock; |
| } |
| |
| /* |
| * Figure out what version number to use in the inodes we create. |
| * If the superblock version has caught up to the one that supports |
| * the new inode format, then use the new inode version. Otherwise |
| * use the old version so that old kernels will continue to be |
| * able to use the file system. |
| */ |
| if (xfs_sb_version_hasnlink(&mp->m_sb)) |
| version = 2; |
| else |
| version = 1; |
| |
| for (j = 0; j < nbufs; j++) { |
| /* |
| * Get the block. |
| */ |
| d = XFS_AGB_TO_DADDR(mp, agno, agbno + (j * blks_per_cluster)); |
| fbuf = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, |
| mp->m_bsize * blks_per_cluster, 0); |
| if (!fbuf) |
| return ENOMEM; |
| /* |
| * Initialize all inodes in this buffer and then log them. |
| * |
| * XXX: It would be much better if we had just one transaction |
| * to log a whole cluster of inodes instead of all the |
| * individual transactions causing a lot of log traffic. |
| */ |
| xfs_buf_zero(fbuf, 0, ninodes << mp->m_sb.sb_inodelog); |
| for (i = 0; i < ninodes; i++) { |
| int ioffset = i << mp->m_sb.sb_inodelog; |
| uint isize = sizeof(struct xfs_dinode); |
| |
| free = xfs_make_iptr(mp, fbuf, i); |
| free->di_magic = cpu_to_be16(XFS_DINODE_MAGIC); |
| free->di_version = version; |
| free->di_gen = cpu_to_be32(gen); |
| free->di_next_unlinked = cpu_to_be32(NULLAGINO); |
| xfs_trans_log_buf(tp, fbuf, ioffset, ioffset + isize - 1); |
| } |
| xfs_trans_inode_alloc_buf(tp, fbuf); |
| } |
| return 0; |
| } |
| |
| /* |
| * Allocate new inodes in the allocation group specified by agbp. |
| * Return 0 for success, else error code. |
| */ |
| STATIC int /* error code or 0 */ |
| xfs_ialloc_ag_alloc( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_buf_t *agbp, /* alloc group buffer */ |
| int *alloc) |
| { |
| xfs_agi_t *agi; /* allocation group header */ |
| xfs_alloc_arg_t args; /* allocation argument structure */ |
| xfs_btree_cur_t *cur; /* inode btree cursor */ |
| xfs_agnumber_t agno; |
| int error; |
| int i; |
| xfs_agino_t newino; /* new first inode's number */ |
| xfs_agino_t newlen; /* new number of inodes */ |
| xfs_agino_t thisino; /* current inode number, for loop */ |
| int isaligned = 0; /* inode allocation at stripe unit */ |
| /* boundary */ |
| struct xfs_perag *pag; |
| |
| args.tp = tp; |
| args.mp = tp->t_mountp; |
| |
| /* |
| * Locking will ensure that we don't have two callers in here |
| * at one time. |
| */ |
| newlen = XFS_IALLOC_INODES(args.mp); |
| if (args.mp->m_maxicount && |
| args.mp->m_sb.sb_icount + newlen > args.mp->m_maxicount) |
| return XFS_ERROR(ENOSPC); |
| args.minlen = args.maxlen = XFS_IALLOC_BLOCKS(args.mp); |
| /* |
| * First try to allocate inodes contiguous with the last-allocated |
| * chunk of inodes. If the filesystem is striped, this will fill |
| * an entire stripe unit with inodes. |
| */ |
| agi = XFS_BUF_TO_AGI(agbp); |
| newino = be32_to_cpu(agi->agi_newino); |
| agno = be32_to_cpu(agi->agi_seqno); |
| args.agbno = XFS_AGINO_TO_AGBNO(args.mp, newino) + |
| XFS_IALLOC_BLOCKS(args.mp); |
| if (likely(newino != NULLAGINO && |
| (args.agbno < be32_to_cpu(agi->agi_length)))) { |
| args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno); |
| args.type = XFS_ALLOCTYPE_THIS_BNO; |
| args.mod = args.total = args.wasdel = args.isfl = |
| args.userdata = args.minalignslop = 0; |
| args.prod = 1; |
| |
| /* |
| * We need to take into account alignment here to ensure that |
| * we don't modify the free list if we fail to have an exact |
| * block. If we don't have an exact match, and every oher |
| * attempt allocation attempt fails, we'll end up cancelling |
| * a dirty transaction and shutting down. |
| * |
| * For an exact allocation, alignment must be 1, |
| * however we need to take cluster alignment into account when |
| * fixing up the freelist. Use the minalignslop field to |
| * indicate that extra blocks might be required for alignment, |
| * but not to use them in the actual exact allocation. |
| */ |
| args.alignment = 1; |
| args.minalignslop = xfs_ialloc_cluster_alignment(&args) - 1; |
| |
| /* Allow space for the inode btree to split. */ |
| args.minleft = args.mp->m_in_maxlevels - 1; |
| if ((error = xfs_alloc_vextent(&args))) |
| return error; |
| } else |
| args.fsbno = NULLFSBLOCK; |
| |
| if (unlikely(args.fsbno == NULLFSBLOCK)) { |
| /* |
| * Set the alignment for the allocation. |
| * If stripe alignment is turned on then align at stripe unit |
| * boundary. |
| * If the cluster size is smaller than a filesystem block |
| * then we're doing I/O for inodes in filesystem block size |
| * pieces, so don't need alignment anyway. |
| */ |
| isaligned = 0; |
| if (args.mp->m_sinoalign) { |
| ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN)); |
| args.alignment = args.mp->m_dalign; |
| isaligned = 1; |
| } else |
| args.alignment = xfs_ialloc_cluster_alignment(&args); |
| /* |
| * Need to figure out where to allocate the inode blocks. |
| * Ideally they should be spaced out through the a.g. |
| * For now, just allocate blocks up front. |
| */ |
| args.agbno = be32_to_cpu(agi->agi_root); |
| args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno); |
| /* |
| * Allocate a fixed-size extent of inodes. |
| */ |
| args.type = XFS_ALLOCTYPE_NEAR_BNO; |
| args.mod = args.total = args.wasdel = args.isfl = |
| args.userdata = args.minalignslop = 0; |
| args.prod = 1; |
| /* |
| * Allow space for the inode btree to split. |
| */ |
| args.minleft = args.mp->m_in_maxlevels - 1; |
| if ((error = xfs_alloc_vextent(&args))) |
| return error; |
| } |
| |
| /* |
| * If stripe alignment is turned on, then try again with cluster |
| * alignment. |
| */ |
| if (isaligned && args.fsbno == NULLFSBLOCK) { |
| args.type = XFS_ALLOCTYPE_NEAR_BNO; |
| args.agbno = be32_to_cpu(agi->agi_root); |
| args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno); |
| args.alignment = xfs_ialloc_cluster_alignment(&args); |
| if ((error = xfs_alloc_vextent(&args))) |
| return error; |
| } |
| |
| if (args.fsbno == NULLFSBLOCK) { |
| *alloc = 0; |
| return 0; |
| } |
| ASSERT(args.len == args.minlen); |
| |
| /* |
| * Stamp and write the inode buffers. |
| * |
| * Seed the new inode cluster with a random generation number. This |
| * prevents short-term reuse of generation numbers if a chunk is |
| * freed and then immediately reallocated. We use random numbers |
| * rather than a linear progression to prevent the next generation |
| * number from being easily guessable. |
| */ |
| error = xfs_ialloc_inode_init(args.mp, tp, agno, args.agbno, |
| args.len, random32()); |
| |
| if (error) |
| return error; |
| /* |
| * Convert the results. |
| */ |
| newino = XFS_OFFBNO_TO_AGINO(args.mp, args.agbno, 0); |
| be32_add_cpu(&agi->agi_count, newlen); |
| be32_add_cpu(&agi->agi_freecount, newlen); |
| pag = xfs_perag_get(args.mp, agno); |
| pag->pagi_freecount += newlen; |
| xfs_perag_put(pag); |
| agi->agi_newino = cpu_to_be32(newino); |
| |
| /* |
| * Insert records describing the new inode chunk into the btree. |
| */ |
| cur = xfs_inobt_init_cursor(args.mp, tp, agbp, agno); |
| for (thisino = newino; |
| thisino < newino + newlen; |
| thisino += XFS_INODES_PER_CHUNK) { |
| cur->bc_rec.i.ir_startino = thisino; |
| cur->bc_rec.i.ir_freecount = XFS_INODES_PER_CHUNK; |
| cur->bc_rec.i.ir_free = XFS_INOBT_ALL_FREE; |
| error = xfs_btree_lookup(cur, XFS_LOOKUP_EQ, &i); |
| if (error) { |
| xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); |
| return error; |
| } |
| ASSERT(i == 0); |
| error = xfs_btree_insert(cur, &i); |
| if (error) { |
| xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); |
| return error; |
| } |
| ASSERT(i == 1); |
| } |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| /* |
| * Log allocation group header fields |
| */ |
| xfs_ialloc_log_agi(tp, agbp, |
| XFS_AGI_COUNT | XFS_AGI_FREECOUNT | XFS_AGI_NEWINO); |
| /* |
| * Modify/log superblock values for inode count and inode free count. |
| */ |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, (long)newlen); |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, (long)newlen); |
| *alloc = 1; |
| return 0; |
| } |
| |
| STATIC xfs_agnumber_t |
| xfs_ialloc_next_ag( |
| xfs_mount_t *mp) |
| { |
| xfs_agnumber_t agno; |
| |
| spin_lock(&mp->m_agirotor_lock); |
| agno = mp->m_agirotor; |
| if (++mp->m_agirotor == mp->m_maxagi) |
| mp->m_agirotor = 0; |
| spin_unlock(&mp->m_agirotor_lock); |
| |
| return agno; |
| } |
| |
| /* |
| * Select an allocation group to look for a free inode in, based on the parent |
| * inode and then mode. Return the allocation group buffer. |
| */ |
| STATIC xfs_buf_t * /* allocation group buffer */ |
| xfs_ialloc_ag_select( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_ino_t parent, /* parent directory inode number */ |
| umode_t mode, /* bits set to indicate file type */ |
| int okalloc) /* ok to allocate more space */ |
| { |
| xfs_buf_t *agbp; /* allocation group header buffer */ |
| xfs_agnumber_t agcount; /* number of ag's in the filesystem */ |
| xfs_agnumber_t agno; /* current ag number */ |
| int flags; /* alloc buffer locking flags */ |
| xfs_extlen_t ineed; /* blocks needed for inode allocation */ |
| xfs_extlen_t longest = 0; /* longest extent available */ |
| xfs_mount_t *mp; /* mount point structure */ |
| int needspace; /* file mode implies space allocated */ |
| xfs_perag_t *pag; /* per allocation group data */ |
| xfs_agnumber_t pagno; /* parent (starting) ag number */ |
| |
| /* |
| * Files of these types need at least one block if length > 0 |
| * (and they won't fit in the inode, but that's hard to figure out). |
| */ |
| needspace = S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode); |
| mp = tp->t_mountp; |
| agcount = mp->m_maxagi; |
| if (S_ISDIR(mode)) |
| pagno = xfs_ialloc_next_ag(mp); |
| else { |
| pagno = XFS_INO_TO_AGNO(mp, parent); |
| if (pagno >= agcount) |
| pagno = 0; |
| } |
| ASSERT(pagno < agcount); |
| /* |
| * Loop through allocation groups, looking for one with a little |
| * free space in it. Note we don't look for free inodes, exactly. |
| * Instead, we include whether there is a need to allocate inodes |
| * to mean that blocks must be allocated for them, |
| * if none are currently free. |
| */ |
| agno = pagno; |
| flags = XFS_ALLOC_FLAG_TRYLOCK; |
| for (;;) { |
| pag = xfs_perag_get(mp, agno); |
| if (!pag->pagi_init) { |
| if (xfs_ialloc_read_agi(mp, tp, agno, &agbp)) { |
| agbp = NULL; |
| goto nextag; |
| } |
| } else |
| agbp = NULL; |
| |
| if (!pag->pagi_inodeok) { |
| xfs_ialloc_next_ag(mp); |
| goto unlock_nextag; |
| } |
| |
| /* |
| * Is there enough free space for the file plus a block |
| * of inodes (if we need to allocate some)? |
| */ |
| ineed = pag->pagi_freecount ? 0 : XFS_IALLOC_BLOCKS(mp); |
| if (ineed && !pag->pagf_init) { |
| if (agbp == NULL && |
| xfs_ialloc_read_agi(mp, tp, agno, &agbp)) { |
| agbp = NULL; |
| goto nextag; |
| } |
| (void)xfs_alloc_pagf_init(mp, tp, agno, flags); |
| } |
| if (!ineed || pag->pagf_init) { |
| if (ineed && !(longest = pag->pagf_longest)) |
| longest = pag->pagf_flcount > 0; |
| if (!ineed || |
| (pag->pagf_freeblks >= needspace + ineed && |
| longest >= ineed && |
| okalloc)) { |
| if (agbp == NULL && |
| xfs_ialloc_read_agi(mp, tp, agno, &agbp)) { |
| agbp = NULL; |
| goto nextag; |
| } |
| xfs_perag_put(pag); |
| return agbp; |
| } |
| } |
| unlock_nextag: |
| if (agbp) |
| xfs_trans_brelse(tp, agbp); |
| nextag: |
| xfs_perag_put(pag); |
| /* |
| * No point in iterating over the rest, if we're shutting |
| * down. |
| */ |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return NULL; |
| agno++; |
| if (agno >= agcount) |
| agno = 0; |
| if (agno == pagno) { |
| if (flags == 0) |
| return NULL; |
| flags = 0; |
| } |
| } |
| } |
| |
| /* |
| * Try to retrieve the next record to the left/right from the current one. |
| */ |
| STATIC int |
| xfs_ialloc_next_rec( |
| struct xfs_btree_cur *cur, |
| xfs_inobt_rec_incore_t *rec, |
| int *done, |
| int left) |
| { |
| int error; |
| int i; |
| |
| if (left) |
| error = xfs_btree_decrement(cur, 0, &i); |
| else |
| error = xfs_btree_increment(cur, 0, &i); |
| |
| if (error) |
| return error; |
| *done = !i; |
| if (i) { |
| error = xfs_inobt_get_rec(cur, rec, &i); |
| if (error) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(i == 1); |
| } |
| |
| return 0; |
| } |
| |
| STATIC int |
| xfs_ialloc_get_rec( |
| struct xfs_btree_cur *cur, |
| xfs_agino_t agino, |
| xfs_inobt_rec_incore_t *rec, |
| int *done, |
| int left) |
| { |
| int error; |
| int i; |
| |
| error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_EQ, &i); |
| if (error) |
| return error; |
| *done = !i; |
| if (i) { |
| error = xfs_inobt_get_rec(cur, rec, &i); |
| if (error) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(i == 1); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Allocate an inode. |
| * |
| * The caller selected an AG for us, and made sure that free inodes are |
| * available. |
| */ |
| STATIC int |
| xfs_dialloc_ag( |
| struct xfs_trans *tp, |
| struct xfs_buf *agbp, |
| xfs_ino_t parent, |
| xfs_ino_t *inop) |
| { |
| struct xfs_mount *mp = tp->t_mountp; |
| struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp); |
| xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno); |
| xfs_agnumber_t pagno = XFS_INO_TO_AGNO(mp, parent); |
| xfs_agino_t pagino = XFS_INO_TO_AGINO(mp, parent); |
| struct xfs_perag *pag; |
| struct xfs_btree_cur *cur, *tcur; |
| struct xfs_inobt_rec_incore rec, trec; |
| xfs_ino_t ino; |
| int error; |
| int offset; |
| int i, j; |
| |
| pag = xfs_perag_get(mp, agno); |
| |
| ASSERT(pag->pagi_init); |
| ASSERT(pag->pagi_inodeok); |
| ASSERT(pag->pagi_freecount > 0); |
| |
| restart_pagno: |
| cur = xfs_inobt_init_cursor(mp, tp, agbp, agno); |
| /* |
| * If pagino is 0 (this is the root inode allocation) use newino. |
| * This must work because we've just allocated some. |
| */ |
| if (!pagino) |
| pagino = be32_to_cpu(agi->agi_newino); |
| |
| error = xfs_check_agi_freecount(cur, agi); |
| if (error) |
| goto error0; |
| |
| /* |
| * If in the same AG as the parent, try to get near the parent. |
| */ |
| if (pagno == agno) { |
| int doneleft; /* done, to the left */ |
| int doneright; /* done, to the right */ |
| int searchdistance = 10; |
| |
| error = xfs_inobt_lookup(cur, pagino, XFS_LOOKUP_LE, &i); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| |
| error = xfs_inobt_get_rec(cur, &rec, &j); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| |
| if (rec.ir_freecount > 0) { |
| /* |
| * Found a free inode in the same chunk |
| * as the parent, done. |
| */ |
| goto alloc_inode; |
| } |
| |
| |
| /* |
| * In the same AG as parent, but parent's chunk is full. |
| */ |
| |
| /* duplicate the cursor, search left & right simultaneously */ |
| error = xfs_btree_dup_cursor(cur, &tcur); |
| if (error) |
| goto error0; |
| |
| /* |
| * Skip to last blocks looked up if same parent inode. |
| */ |
| if (pagino != NULLAGINO && |
| pag->pagl_pagino == pagino && |
| pag->pagl_leftrec != NULLAGINO && |
| pag->pagl_rightrec != NULLAGINO) { |
| error = xfs_ialloc_get_rec(tcur, pag->pagl_leftrec, |
| &trec, &doneleft, 1); |
| if (error) |
| goto error1; |
| |
| error = xfs_ialloc_get_rec(cur, pag->pagl_rightrec, |
| &rec, &doneright, 0); |
| if (error) |
| goto error1; |
| } else { |
| /* search left with tcur, back up 1 record */ |
| error = xfs_ialloc_next_rec(tcur, &trec, &doneleft, 1); |
| if (error) |
| goto error1; |
| |
| /* search right with cur, go forward 1 record. */ |
| error = xfs_ialloc_next_rec(cur, &rec, &doneright, 0); |
| if (error) |
| goto error1; |
| } |
| |
| /* |
| * Loop until we find an inode chunk with a free inode. |
| */ |
| while (!doneleft || !doneright) { |
| int useleft; /* using left inode chunk this time */ |
| |
| if (!--searchdistance) { |
| /* |
| * Not in range - save last search |
| * location and allocate a new inode |
| */ |
| xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); |
| pag->pagl_leftrec = trec.ir_startino; |
| pag->pagl_rightrec = rec.ir_startino; |
| pag->pagl_pagino = pagino; |
| goto newino; |
| } |
| |
| /* figure out the closer block if both are valid. */ |
| if (!doneleft && !doneright) { |
| useleft = pagino - |
| (trec.ir_startino + XFS_INODES_PER_CHUNK - 1) < |
| rec.ir_startino - pagino; |
| } else { |
| useleft = !doneleft; |
| } |
| |
| /* free inodes to the left? */ |
| if (useleft && trec.ir_freecount) { |
| rec = trec; |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| cur = tcur; |
| |
| pag->pagl_leftrec = trec.ir_startino; |
| pag->pagl_rightrec = rec.ir_startino; |
| pag->pagl_pagino = pagino; |
| goto alloc_inode; |
| } |
| |
| /* free inodes to the right? */ |
| if (!useleft && rec.ir_freecount) { |
| xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); |
| |
| pag->pagl_leftrec = trec.ir_startino; |
| pag->pagl_rightrec = rec.ir_startino; |
| pag->pagl_pagino = pagino; |
| goto alloc_inode; |
| } |
| |
| /* get next record to check */ |
| if (useleft) { |
| error = xfs_ialloc_next_rec(tcur, &trec, |
| &doneleft, 1); |
| } else { |
| error = xfs_ialloc_next_rec(cur, &rec, |
| &doneright, 0); |
| } |
| if (error) |
| goto error1; |
| } |
| |
| /* |
| * We've reached the end of the btree. because |
| * we are only searching a small chunk of the |
| * btree each search, there is obviously free |
| * inodes closer to the parent inode than we |
| * are now. restart the search again. |
| */ |
| pag->pagl_pagino = NULLAGINO; |
| pag->pagl_leftrec = NULLAGINO; |
| pag->pagl_rightrec = NULLAGINO; |
| xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| goto restart_pagno; |
| } |
| |
| /* |
| * In a different AG from the parent. |
| * See if the most recently allocated block has any free. |
| */ |
| newino: |
| if (agi->agi_newino != cpu_to_be32(NULLAGINO)) { |
| error = xfs_inobt_lookup(cur, be32_to_cpu(agi->agi_newino), |
| XFS_LOOKUP_EQ, &i); |
| if (error) |
| goto error0; |
| |
| if (i == 1) { |
| error = xfs_inobt_get_rec(cur, &rec, &j); |
| if (error) |
| goto error0; |
| |
| if (j == 1 && rec.ir_freecount > 0) { |
| /* |
| * The last chunk allocated in the group |
| * still has a free inode. |
| */ |
| goto alloc_inode; |
| } |
| } |
| } |
| |
| /* |
| * None left in the last group, search the whole AG |
| */ |
| error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &i); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| |
| for (;;) { |
| error = xfs_inobt_get_rec(cur, &rec, &i); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| if (rec.ir_freecount > 0) |
| break; |
| error = xfs_btree_increment(cur, 0, &i); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| } |
| |
| alloc_inode: |
| offset = xfs_lowbit64(rec.ir_free); |
| ASSERT(offset >= 0); |
| ASSERT(offset < XFS_INODES_PER_CHUNK); |
| ASSERT((XFS_AGINO_TO_OFFSET(mp, rec.ir_startino) % |
| XFS_INODES_PER_CHUNK) == 0); |
| ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino + offset); |
| rec.ir_free &= ~XFS_INOBT_MASK(offset); |
| rec.ir_freecount--; |
| error = xfs_inobt_update(cur, &rec); |
| if (error) |
| goto error0; |
| be32_add_cpu(&agi->agi_freecount, -1); |
| xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT); |
| pag->pagi_freecount--; |
| |
| error = xfs_check_agi_freecount(cur, agi); |
| if (error) |
| goto error0; |
| |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1); |
| xfs_perag_put(pag); |
| *inop = ino; |
| return 0; |
| error1: |
| xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR); |
| error0: |
| xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); |
| xfs_perag_put(pag); |
| return error; |
| } |
| |
| /* |
| * Allocate an inode on disk. |
| * |
| * Mode is used to tell whether the new inode will need space, and whether it |
| * is a directory. |
| * |
| * This function is designed to be called twice if it has to do an allocation |
| * to make more free inodes. On the first call, *IO_agbp should be set to NULL. |
| * If an inode is available without having to performn an allocation, an inode |
| * number is returned. In this case, *IO_agbp would be NULL. If an allocation |
| * needes to be done, xfs_dialloc would return the current AGI buffer in |
| * *IO_agbp. The caller should then commit the current transaction, allocate a |
| * new transaction, and call xfs_dialloc() again, passing in the previous value |
| * of *IO_agbp. IO_agbp should be held across the transactions. Since the AGI |
| * buffer is locked across the two calls, the second call is guaranteed to have |
| * a free inode available. |
| * |
| * Once we successfully pick an inode its number is returned and the on-disk |
| * data structures are updated. The inode itself is not read in, since doing so |
| * would break ordering constraints with xfs_reclaim. |
| */ |
| int |
| xfs_dialloc( |
| struct xfs_trans *tp, |
| xfs_ino_t parent, |
| umode_t mode, |
| int okalloc, |
| struct xfs_buf **IO_agbp, |
| xfs_ino_t *inop) |
| { |
| struct xfs_buf *agbp; |
| xfs_agnumber_t agno; |
| struct xfs_agi *agi; |
| int error; |
| int ialloced; |
| int noroom = 0; |
| struct xfs_mount *mp; |
| xfs_agnumber_t tagno; |
| struct xfs_perag *pag; |
| |
| if (*IO_agbp) { |
| /* |
| * If the caller passes in a pointer to the AGI buffer, |
| * continue where we left off before. In this case, we |
| * know that the allocation group has free inodes. |
| */ |
| agbp = *IO_agbp; |
| goto out_alloc; |
| } |
| |
| /* |
| * We do not have an agbp, so select an initial allocation |
| * group for inode allocation. |
| */ |
| agbp = xfs_ialloc_ag_select(tp, parent, mode, okalloc); |
| |
| /* |
| * Couldn't find an allocation group satisfying the |
| * criteria, give up. |
| */ |
| if (!agbp) { |
| *inop = NULLFSINO; |
| return 0; |
| } |
| agi = XFS_BUF_TO_AGI(agbp); |
| |
| mp = tp->t_mountp; |
| agno = be32_to_cpu(agi->agi_seqno); |
| tagno = agno; |
| |
| /* |
| * If we have already hit the ceiling of inode blocks then clear |
| * okalloc so we scan all available agi structures for a free |
| * inode. |
| */ |
| |
| if (mp->m_maxicount && |
| mp->m_sb.sb_icount + XFS_IALLOC_INODES(mp) > mp->m_maxicount) { |
| noroom = 1; |
| okalloc = 0; |
| } |
| |
| /* |
| * Loop until we find an allocation group that either has free inodes |
| * or in which we can allocate some inodes. Iterate through the |
| * allocation groups upward, wrapping at the end. |
| */ |
| while (!agi->agi_freecount) { |
| /* |
| * Don't do anything if we're not supposed to allocate |
| * any blocks, just go on to the next ag. |
| */ |
| if (okalloc) { |
| /* |
| * Try to allocate some new inodes in the allocation |
| * group. |
| */ |
| if ((error = xfs_ialloc_ag_alloc(tp, agbp, &ialloced))) { |
| xfs_trans_brelse(tp, agbp); |
| if (error == ENOSPC) { |
| *inop = NULLFSINO; |
| return 0; |
| } else |
| return error; |
| } |
| if (ialloced) { |
| /* |
| * We successfully allocated some inodes, return |
| * the current context to the caller so that it |
| * can commit the current transaction and call |
| * us again where we left off. |
| */ |
| ASSERT(be32_to_cpu(agi->agi_freecount) > 0); |
| *IO_agbp = agbp; |
| *inop = NULLFSINO; |
| return 0; |
| } |
| } |
| /* |
| * If it failed, give up on this ag. |
| */ |
| xfs_trans_brelse(tp, agbp); |
| /* |
| * Go on to the next ag: get its ag header. |
| */ |
| nextag: |
| if (++tagno == mp->m_sb.sb_agcount) |
| tagno = 0; |
| if (tagno == agno) { |
| *inop = NULLFSINO; |
| return noroom ? ENOSPC : 0; |
| } |
| pag = xfs_perag_get(mp, tagno); |
| if (pag->pagi_inodeok == 0) { |
| xfs_perag_put(pag); |
| goto nextag; |
| } |
| error = xfs_ialloc_read_agi(mp, tp, tagno, &agbp); |
| xfs_perag_put(pag); |
| if (error) |
| goto nextag; |
| agi = XFS_BUF_TO_AGI(agbp); |
| ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC)); |
| } |
| |
| out_alloc: |
| *IO_agbp = NULL; |
| return xfs_dialloc_ag(tp, agbp, parent, inop); |
| } |
| |
| /* |
| * Free disk inode. Carefully avoids touching the incore inode, all |
| * manipulations incore are the caller's responsibility. |
| * The on-disk inode is not changed by this operation, only the |
| * btree (free inode mask) is changed. |
| */ |
| int |
| xfs_difree( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_ino_t inode, /* inode to be freed */ |
| xfs_bmap_free_t *flist, /* extents to free */ |
| int *delete, /* set if inode cluster was deleted */ |
| xfs_ino_t *first_ino) /* first inode in deleted cluster */ |
| { |
| /* REFERENCED */ |
| xfs_agblock_t agbno; /* block number containing inode */ |
| xfs_buf_t *agbp; /* buffer containing allocation group header */ |
| xfs_agino_t agino; /* inode number relative to allocation group */ |
| xfs_agnumber_t agno; /* allocation group number */ |
| xfs_agi_t *agi; /* allocation group header */ |
| xfs_btree_cur_t *cur; /* inode btree cursor */ |
| int error; /* error return value */ |
| int i; /* result code */ |
| int ilen; /* inodes in an inode cluster */ |
| xfs_mount_t *mp; /* mount structure for filesystem */ |
| int off; /* offset of inode in inode chunk */ |
| xfs_inobt_rec_incore_t rec; /* btree record */ |
| struct xfs_perag *pag; |
| |
| mp = tp->t_mountp; |
| |
| /* |
| * Break up inode number into its components. |
| */ |
| agno = XFS_INO_TO_AGNO(mp, inode); |
| if (agno >= mp->m_sb.sb_agcount) { |
| xfs_warn(mp, "%s: agno >= mp->m_sb.sb_agcount (%d >= %d).", |
| __func__, agno, mp->m_sb.sb_agcount); |
| ASSERT(0); |
| return XFS_ERROR(EINVAL); |
| } |
| agino = XFS_INO_TO_AGINO(mp, inode); |
| if (inode != XFS_AGINO_TO_INO(mp, agno, agino)) { |
| xfs_warn(mp, "%s: inode != XFS_AGINO_TO_INO() (%llu != %llu).", |
| __func__, (unsigned long long)inode, |
| (unsigned long long)XFS_AGINO_TO_INO(mp, agno, agino)); |
| ASSERT(0); |
| return XFS_ERROR(EINVAL); |
| } |
| agbno = XFS_AGINO_TO_AGBNO(mp, agino); |
| if (agbno >= mp->m_sb.sb_agblocks) { |
| xfs_warn(mp, "%s: agbno >= mp->m_sb.sb_agblocks (%d >= %d).", |
| __func__, agbno, mp->m_sb.sb_agblocks); |
| ASSERT(0); |
| return XFS_ERROR(EINVAL); |
| } |
| /* |
| * Get the allocation group header. |
| */ |
| error = xfs_ialloc_read_agi(mp, tp, agno, &agbp); |
| if (error) { |
| xfs_warn(mp, "%s: xfs_ialloc_read_agi() returned error %d.", |
| __func__, error); |
| return error; |
| } |
| agi = XFS_BUF_TO_AGI(agbp); |
| ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC)); |
| ASSERT(agbno < be32_to_cpu(agi->agi_length)); |
| /* |
| * Initialize the cursor. |
| */ |
| cur = xfs_inobt_init_cursor(mp, tp, agbp, agno); |
| |
| error = xfs_check_agi_freecount(cur, agi); |
| if (error) |
| goto error0; |
| |
| /* |
| * Look for the entry describing this inode. |
| */ |
| if ((error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &i))) { |
| xfs_warn(mp, "%s: xfs_inobt_lookup() returned error %d.", |
| __func__, error); |
| goto error0; |
| } |
| XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| error = xfs_inobt_get_rec(cur, &rec, &i); |
| if (error) { |
| xfs_warn(mp, "%s: xfs_inobt_get_rec() returned error %d.", |
| __func__, error); |
| goto error0; |
| } |
| XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| /* |
| * Get the offset in the inode chunk. |
| */ |
| off = agino - rec.ir_startino; |
| ASSERT(off >= 0 && off < XFS_INODES_PER_CHUNK); |
| ASSERT(!(rec.ir_free & XFS_INOBT_MASK(off))); |
| /* |
| * Mark the inode free & increment the count. |
| */ |
| rec.ir_free |= XFS_INOBT_MASK(off); |
| rec.ir_freecount++; |
| |
| /* |
| * When an inode cluster is free, it becomes eligible for removal |
| */ |
| if (!(mp->m_flags & XFS_MOUNT_IKEEP) && |
| (rec.ir_freecount == XFS_IALLOC_INODES(mp))) { |
| |
| *delete = 1; |
| *first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino); |
| |
| /* |
| * Remove the inode cluster from the AGI B+Tree, adjust the |
| * AGI and Superblock inode counts, and mark the disk space |
| * to be freed when the transaction is committed. |
| */ |
| ilen = XFS_IALLOC_INODES(mp); |
| be32_add_cpu(&agi->agi_count, -ilen); |
| be32_add_cpu(&agi->agi_freecount, -(ilen - 1)); |
| xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT); |
| pag = xfs_perag_get(mp, agno); |
| pag->pagi_freecount -= ilen - 1; |
| xfs_perag_put(pag); |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen); |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1)); |
| |
| if ((error = xfs_btree_delete(cur, &i))) { |
| xfs_warn(mp, "%s: xfs_btree_delete returned error %d.", |
| __func__, error); |
| goto error0; |
| } |
| |
| xfs_bmap_add_free(XFS_AGB_TO_FSB(mp, |
| agno, XFS_INO_TO_AGBNO(mp,rec.ir_startino)), |
| XFS_IALLOC_BLOCKS(mp), flist, mp); |
| } else { |
| *delete = 0; |
| |
| error = xfs_inobt_update(cur, &rec); |
| if (error) { |
| xfs_warn(mp, "%s: xfs_inobt_update returned error %d.", |
| __func__, error); |
| goto error0; |
| } |
| |
| /* |
| * Change the inode free counts and log the ag/sb changes. |
| */ |
| be32_add_cpu(&agi->agi_freecount, 1); |
| xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT); |
| pag = xfs_perag_get(mp, agno); |
| pag->pagi_freecount++; |
| xfs_perag_put(pag); |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1); |
| } |
| |
| error = xfs_check_agi_freecount(cur, agi); |
| if (error) |
| goto error0; |
| |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| return 0; |
| |
| error0: |
| xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); |
| return error; |
| } |
| |
| STATIC int |
| xfs_imap_lookup( |
| struct xfs_mount *mp, |
| struct xfs_trans *tp, |
| xfs_agnumber_t agno, |
| xfs_agino_t agino, |
| xfs_agblock_t agbno, |
| xfs_agblock_t *chunk_agbno, |
| xfs_agblock_t *offset_agbno, |
| int flags) |
| { |
| struct xfs_inobt_rec_incore rec; |
| struct xfs_btree_cur *cur; |
| struct xfs_buf *agbp; |
| int error; |
| int i; |
| |
| error = xfs_ialloc_read_agi(mp, tp, agno, &agbp); |
| if (error) { |
| xfs_alert(mp, |
| "%s: xfs_ialloc_read_agi() returned error %d, agno %d", |
| __func__, error, agno); |
| return error; |
| } |
| |
| /* |
| * Lookup the inode record for the given agino. If the record cannot be |
| * found, then it's an invalid inode number and we should abort. Once |
| * we have a record, we need to ensure it contains the inode number |
| * we are looking up. |
| */ |
| cur = xfs_inobt_init_cursor(mp, tp, agbp, agno); |
| error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &i); |
| if (!error) { |
| if (i) |
| error = xfs_inobt_get_rec(cur, &rec, &i); |
| if (!error && i == 0) |
| error = EINVAL; |
| } |
| |
| xfs_trans_brelse(tp, agbp); |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| if (error) |
| return error; |
| |
| /* check that the returned record contains the required inode */ |
| if (rec.ir_startino > agino || |
| rec.ir_startino + XFS_IALLOC_INODES(mp) <= agino) |
| return EINVAL; |
| |
| /* for untrusted inodes check it is allocated first */ |
| if ((flags & XFS_IGET_UNTRUSTED) && |
| (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino))) |
| return EINVAL; |
| |
| *chunk_agbno = XFS_AGINO_TO_AGBNO(mp, rec.ir_startino); |
| *offset_agbno = agbno - *chunk_agbno; |
| return 0; |
| } |
| |
| /* |
| * Return the location of the inode in imap, for mapping it into a buffer. |
| */ |
| int |
| xfs_imap( |
| xfs_mount_t *mp, /* file system mount structure */ |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_ino_t ino, /* inode to locate */ |
| struct xfs_imap *imap, /* location map structure */ |
| uint flags) /* flags for inode btree lookup */ |
| { |
| xfs_agblock_t agbno; /* block number of inode in the alloc group */ |
| xfs_agino_t agino; /* inode number within alloc group */ |
| xfs_agnumber_t agno; /* allocation group number */ |
| int blks_per_cluster; /* num blocks per inode cluster */ |
| xfs_agblock_t chunk_agbno; /* first block in inode chunk */ |
| xfs_agblock_t cluster_agbno; /* first block in inode cluster */ |
| int error; /* error code */ |
| int offset; /* index of inode in its buffer */ |
| int offset_agbno; /* blks from chunk start to inode */ |
| |
| ASSERT(ino != NULLFSINO); |
| |
| /* |
| * Split up the inode number into its parts. |
| */ |
| agno = XFS_INO_TO_AGNO(mp, ino); |
| agino = XFS_INO_TO_AGINO(mp, ino); |
| agbno = XFS_AGINO_TO_AGBNO(mp, agino); |
| if (agno >= mp->m_sb.sb_agcount || agbno >= mp->m_sb.sb_agblocks || |
| ino != XFS_AGINO_TO_INO(mp, agno, agino)) { |
| #ifdef DEBUG |
| /* |
| * Don't output diagnostic information for untrusted inodes |
| * as they can be invalid without implying corruption. |
| */ |
| if (flags & XFS_IGET_UNTRUSTED) |
| return XFS_ERROR(EINVAL); |
| if (agno >= mp->m_sb.sb_agcount) { |
| xfs_alert(mp, |
| "%s: agno (%d) >= mp->m_sb.sb_agcount (%d)", |
| __func__, agno, mp->m_sb.sb_agcount); |
| } |
| if (agbno >= mp->m_sb.sb_agblocks) { |
| xfs_alert(mp, |
| "%s: agbno (0x%llx) >= mp->m_sb.sb_agblocks (0x%lx)", |
| __func__, (unsigned long long)agbno, |
| (unsigned long)mp->m_sb.sb_agblocks); |
| } |
| if (ino != XFS_AGINO_TO_INO(mp, agno, agino)) { |
| xfs_alert(mp, |
| "%s: ino (0x%llx) != XFS_AGINO_TO_INO() (0x%llx)", |
| __func__, ino, |
| XFS_AGINO_TO_INO(mp, agno, agino)); |
| } |
| xfs_stack_trace(); |
| #endif /* DEBUG */ |
| return XFS_ERROR(EINVAL); |
| } |
| |
| blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_blocklog; |
| |
| /* |
| * For bulkstat and handle lookups, we have an untrusted inode number |
| * that we have to verify is valid. We cannot do this just by reading |
| * the inode buffer as it may have been unlinked and removed leaving |
| * inodes in stale state on disk. Hence we have to do a btree lookup |
| * in all cases where an untrusted inode number is passed. |
| */ |
| if (flags & XFS_IGET_UNTRUSTED) { |
| error = xfs_imap_lookup(mp, tp, agno, agino, agbno, |
| &chunk_agbno, &offset_agbno, flags); |
| if (error) |
| return error; |
| goto out_map; |
| } |
| |
| /* |
| * If the inode cluster size is the same as the blocksize or |
| * smaller we get to the buffer by simple arithmetics. |
| */ |
| if (XFS_INODE_CLUSTER_SIZE(mp) <= mp->m_sb.sb_blocksize) { |
| offset = XFS_INO_TO_OFFSET(mp, ino); |
| ASSERT(offset < mp->m_sb.sb_inopblock); |
| |
| imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, agbno); |
| imap->im_len = XFS_FSB_TO_BB(mp, 1); |
| imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog); |
| return 0; |
| } |
| |
| /* |
| * If the inode chunks are aligned then use simple maths to |
| * find the location. Otherwise we have to do a btree |
| * lookup to find the location. |
| */ |
| if (mp->m_inoalign_mask) { |
| offset_agbno = agbno & mp->m_inoalign_mask; |
| chunk_agbno = agbno - offset_agbno; |
| } else { |
| error = xfs_imap_lookup(mp, tp, agno, agino, agbno, |
| &chunk_agbno, &offset_agbno, flags); |
| if (error) |
| return error; |
| } |
| |
| out_map: |
| ASSERT(agbno >= chunk_agbno); |
| cluster_agbno = chunk_agbno + |
| ((offset_agbno / blks_per_cluster) * blks_per_cluster); |
| offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) + |
| XFS_INO_TO_OFFSET(mp, ino); |
| |
| imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, cluster_agbno); |
| imap->im_len = XFS_FSB_TO_BB(mp, blks_per_cluster); |
| imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog); |
| |
| /* |
| * If the inode number maps to a block outside the bounds |
| * of the file system then return NULL rather than calling |
| * read_buf and panicing when we get an error from the |
| * driver. |
| */ |
| if ((imap->im_blkno + imap->im_len) > |
| XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) { |
| xfs_alert(mp, |
| "%s: (im_blkno (0x%llx) + im_len (0x%llx)) > sb_dblocks (0x%llx)", |
| __func__, (unsigned long long) imap->im_blkno, |
| (unsigned long long) imap->im_len, |
| XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)); |
| return XFS_ERROR(EINVAL); |
| } |
| return 0; |
| } |
| |
| /* |
| * Compute and fill in value of m_in_maxlevels. |
| */ |
| void |
| xfs_ialloc_compute_maxlevels( |
| xfs_mount_t *mp) /* file system mount structure */ |
| { |
| int level; |
| uint maxblocks; |
| uint maxleafents; |
| int minleafrecs; |
| int minnoderecs; |
| |
| maxleafents = (1LL << XFS_INO_AGINO_BITS(mp)) >> |
| XFS_INODES_PER_CHUNK_LOG; |
| minleafrecs = mp->m_alloc_mnr[0]; |
| minnoderecs = mp->m_alloc_mnr[1]; |
| maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs; |
| for (level = 1; maxblocks > 1; level++) |
| maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs; |
| mp->m_in_maxlevels = level; |
| } |
| |
| /* |
| * Log specified fields for the ag hdr (inode section) |
| */ |
| void |
| xfs_ialloc_log_agi( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_buf_t *bp, /* allocation group header buffer */ |
| int fields) /* bitmask of fields to log */ |
| { |
| int first; /* first byte number */ |
| int last; /* last byte number */ |
| static const short offsets[] = { /* field starting offsets */ |
| /* keep in sync with bit definitions */ |
| offsetof(xfs_agi_t, agi_magicnum), |
| offsetof(xfs_agi_t, agi_versionnum), |
| offsetof(xfs_agi_t, agi_seqno), |
| offsetof(xfs_agi_t, agi_length), |
| offsetof(xfs_agi_t, agi_count), |
| offsetof(xfs_agi_t, agi_root), |
| offsetof(xfs_agi_t, agi_level), |
| offsetof(xfs_agi_t, agi_freecount), |
| offsetof(xfs_agi_t, agi_newino), |
| offsetof(xfs_agi_t, agi_dirino), |
| offsetof(xfs_agi_t, agi_unlinked), |
| sizeof(xfs_agi_t) |
| }; |
| #ifdef DEBUG |
| xfs_agi_t *agi; /* allocation group header */ |
| |
| agi = XFS_BUF_TO_AGI(bp); |
| ASSERT(agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC)); |
| #endif |
| /* |
| * Compute byte offsets for the first and last fields. |
| */ |
| xfs_btree_offsets(fields, offsets, XFS_AGI_NUM_BITS, &first, &last); |
| /* |
| * Log the allocation group inode header buffer. |
| */ |
| xfs_trans_log_buf(tp, bp, first, last); |
| } |
| |
| #ifdef DEBUG |
| STATIC void |
| xfs_check_agi_unlinked( |
| struct xfs_agi *agi) |
| { |
| int i; |
| |
| for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++) |
| ASSERT(agi->agi_unlinked[i]); |
| } |
| #else |
| #define xfs_check_agi_unlinked(agi) |
| #endif |
| |
| /* |
| * Read in the allocation group header (inode allocation section) |
| */ |
| int |
| xfs_read_agi( |
| struct xfs_mount *mp, /* file system mount structure */ |
| struct xfs_trans *tp, /* transaction pointer */ |
| xfs_agnumber_t agno, /* allocation group number */ |
| struct xfs_buf **bpp) /* allocation group hdr buf */ |
| { |
| struct xfs_agi *agi; /* allocation group header */ |
| int agi_ok; /* agi is consistent */ |
| int error; |
| |
| ASSERT(agno != NULLAGNUMBER); |
| |
| error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, |
| XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), |
| XFS_FSS_TO_BB(mp, 1), 0, bpp); |
| if (error) |
| return error; |
| |
| ASSERT(!xfs_buf_geterror(*bpp)); |
| agi = XFS_BUF_TO_AGI(*bpp); |
| |
| /* |
| * Validate the magic number of the agi block. |
| */ |
| agi_ok = agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC) && |
| XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)) && |
| be32_to_cpu(agi->agi_seqno) == agno; |
| if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IALLOC_READ_AGI, |
| XFS_RANDOM_IALLOC_READ_AGI))) { |
| XFS_CORRUPTION_ERROR("xfs_read_agi", XFS_ERRLEVEL_LOW, |
| mp, agi); |
| xfs_trans_brelse(tp, *bpp); |
| return XFS_ERROR(EFSCORRUPTED); |
| } |
| |
| xfs_buf_set_ref(*bpp, XFS_AGI_REF); |
| |
| xfs_check_agi_unlinked(agi); |
| return 0; |
| } |
| |
| int |
| xfs_ialloc_read_agi( |
| struct xfs_mount *mp, /* file system mount structure */ |
| struct xfs_trans *tp, /* transaction pointer */ |
| xfs_agnumber_t agno, /* allocation group number */ |
| struct xfs_buf **bpp) /* allocation group hdr buf */ |
| { |
| struct xfs_agi *agi; /* allocation group header */ |
| struct xfs_perag *pag; /* per allocation group data */ |
| int error; |
| |
| error = xfs_read_agi(mp, tp, agno, bpp); |
| if (error) |
| return error; |
| |
| agi = XFS_BUF_TO_AGI(*bpp); |
| pag = xfs_perag_get(mp, agno); |
| if (!pag->pagi_init) { |
| pag->pagi_freecount = be32_to_cpu(agi->agi_freecount); |
| pag->pagi_count = be32_to_cpu(agi->agi_count); |
| pag->pagi_init = 1; |
| } |
| |
| /* |
| * It's possible for these to be out of sync if |
| * we are in the middle of a forced shutdown. |
| */ |
| ASSERT(pag->pagi_freecount == be32_to_cpu(agi->agi_freecount) || |
| XFS_FORCED_SHUTDOWN(mp)); |
| xfs_perag_put(pag); |
| return 0; |
| } |
| |
| /* |
| * Read in the agi to initialise the per-ag data in the mount structure |
| */ |
| int |
| xfs_ialloc_pagi_init( |
| xfs_mount_t *mp, /* file system mount structure */ |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_agnumber_t agno) /* allocation group number */ |
| { |
| xfs_buf_t *bp = NULL; |
| int error; |
| |
| error = xfs_ialloc_read_agi(mp, tp, agno, &bp); |
| if (error) |
| return error; |
| if (bp) |
| xfs_trans_brelse(tp, bp); |
| return 0; |
| } |