diff options
Diffstat (limited to 'kernel/fs/xfs/xfs_fsops.c')
| -rw-r--r-- | kernel/fs/xfs/xfs_fsops.c | 850 |
1 files changed, 850 insertions, 0 deletions
diff --git a/kernel/fs/xfs/xfs_fsops.c b/kernel/fs/xfs/xfs_fsops.c new file mode 100644 index 000000000..cb7e8a29d --- /dev/null +++ b/kernel/fs/xfs/xfs_fsops.c @@ -0,0 +1,850 @@ +/* + * Copyright (c) 2000-2005 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_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_sb.h" +#include "xfs_mount.h" +#include "xfs_da_format.h" +#include "xfs_da_btree.h" +#include "xfs_inode.h" +#include "xfs_trans.h" +#include "xfs_inode_item.h" +#include "xfs_error.h" +#include "xfs_btree.h" +#include "xfs_alloc_btree.h" +#include "xfs_alloc.h" +#include "xfs_ialloc.h" +#include "xfs_fsops.h" +#include "xfs_itable.h" +#include "xfs_trans_space.h" +#include "xfs_rtalloc.h" +#include "xfs_trace.h" +#include "xfs_log.h" +#include "xfs_filestream.h" + +/* + * File system operations + */ + +int +xfs_fs_geometry( + xfs_mount_t *mp, + xfs_fsop_geom_t *geo, + int new_version) +{ + + memset(geo, 0, sizeof(*geo)); + + geo->blocksize = mp->m_sb.sb_blocksize; + geo->rtextsize = mp->m_sb.sb_rextsize; + geo->agblocks = mp->m_sb.sb_agblocks; + geo->agcount = mp->m_sb.sb_agcount; + geo->logblocks = mp->m_sb.sb_logblocks; + geo->sectsize = mp->m_sb.sb_sectsize; + geo->inodesize = mp->m_sb.sb_inodesize; + geo->imaxpct = mp->m_sb.sb_imax_pct; + geo->datablocks = mp->m_sb.sb_dblocks; + geo->rtblocks = mp->m_sb.sb_rblocks; + geo->rtextents = mp->m_sb.sb_rextents; + geo->logstart = mp->m_sb.sb_logstart; + ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid)); + memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid)); + if (new_version >= 2) { + geo->sunit = mp->m_sb.sb_unit; + geo->swidth = mp->m_sb.sb_width; + } + if (new_version >= 3) { + geo->version = XFS_FSOP_GEOM_VERSION; + geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK | + XFS_FSOP_GEOM_FLAGS_DIRV2 | + (xfs_sb_version_hasattr(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_ATTR : 0) | + (xfs_sb_version_hasquota(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_QUOTA : 0) | + (xfs_sb_version_hasalign(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_IALIGN : 0) | + (xfs_sb_version_hasdalign(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_DALIGN : 0) | + (xfs_sb_version_hasextflgbit(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) | + (xfs_sb_version_hassector(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_SECTOR : 0) | + (xfs_sb_version_hasasciici(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) | + (xfs_sb_version_haslazysbcount(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) | + (xfs_sb_version_hasattr2(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) | + (xfs_sb_version_hasprojid32bit(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) | + (xfs_sb_version_hascrc(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_V5SB : 0) | + (xfs_sb_version_hasftype(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_FTYPE : 0) | + (xfs_sb_version_hasfinobt(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_FINOBT : 0); + geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ? + mp->m_sb.sb_logsectsize : BBSIZE; + geo->rtsectsize = mp->m_sb.sb_blocksize; + geo->dirblocksize = mp->m_dir_geo->blksize; + } + if (new_version >= 4) { + geo->flags |= + (xfs_sb_version_haslogv2(&mp->m_sb) ? + XFS_FSOP_GEOM_FLAGS_LOGV2 : 0); + geo->logsunit = mp->m_sb.sb_logsunit; + } + return 0; +} + +static struct xfs_buf * +xfs_growfs_get_hdr_buf( + struct xfs_mount *mp, + xfs_daddr_t blkno, + size_t numblks, + int flags, + const struct xfs_buf_ops *ops) +{ + struct xfs_buf *bp; + + bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags); + if (!bp) + return NULL; + + xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); + bp->b_bn = blkno; + bp->b_maps[0].bm_bn = blkno; + bp->b_ops = ops; + + return bp; +} + +static int +xfs_growfs_data_private( + xfs_mount_t *mp, /* mount point for filesystem */ + xfs_growfs_data_t *in) /* growfs data input struct */ +{ + xfs_agf_t *agf; + struct xfs_agfl *agfl; + xfs_agi_t *agi; + xfs_agnumber_t agno; + xfs_extlen_t agsize; + xfs_extlen_t tmpsize; + xfs_alloc_rec_t *arec; + xfs_buf_t *bp; + int bucket; + int dpct; + int error, saved_error = 0; + xfs_agnumber_t nagcount; + xfs_agnumber_t nagimax = 0; + xfs_rfsblock_t nb, nb_mod; + xfs_rfsblock_t new; + xfs_rfsblock_t nfree; + xfs_agnumber_t oagcount; + int pct; + xfs_trans_t *tp; + + nb = in->newblocks; + pct = in->imaxpct; + if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100) + return -EINVAL; + if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb))) + return error; + dpct = pct - mp->m_sb.sb_imax_pct; + error = xfs_buf_read_uncached(mp->m_ddev_targp, + XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), + XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); + if (error) + return error; + xfs_buf_relse(bp); + + new = nb; /* use new as a temporary here */ + nb_mod = do_div(new, mp->m_sb.sb_agblocks); + nagcount = new + (nb_mod != 0); + if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) { + nagcount--; + nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks; + if (nb < mp->m_sb.sb_dblocks) + return -EINVAL; + } + new = nb - mp->m_sb.sb_dblocks; + oagcount = mp->m_sb.sb_agcount; + + /* allocate the new per-ag structures */ + if (nagcount > oagcount) { + error = xfs_initialize_perag(mp, nagcount, &nagimax); + if (error) + return error; + } + + tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS); + tp->t_flags |= XFS_TRANS_RESERVE; + error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata, + XFS_GROWFS_SPACE_RES(mp), 0); + if (error) { + xfs_trans_cancel(tp, 0); + return error; + } + + /* + * Write new AG headers to disk. Non-transactional, but written + * synchronously so they are completed prior to the growfs transaction + * being logged. + */ + nfree = 0; + for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) { + __be32 *agfl_bno; + + /* + * AG freespace header block + */ + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), + XFS_FSS_TO_BB(mp, 1), 0, + &xfs_agf_buf_ops); + if (!bp) { + error = -ENOMEM; + goto error0; + } + + agf = XFS_BUF_TO_AGF(bp); + agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); + agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); + agf->agf_seqno = cpu_to_be32(agno); + if (agno == nagcount - 1) + agsize = + nb - + (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks); + else + agsize = mp->m_sb.sb_agblocks; + agf->agf_length = cpu_to_be32(agsize); + agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); + agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); + agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); + agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); + agf->agf_flfirst = 0; + agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1); + agf->agf_flcount = 0; + tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp); + agf->agf_freeblks = cpu_to_be32(tmpsize); + agf->agf_longest = cpu_to_be32(tmpsize); + if (xfs_sb_version_hascrc(&mp->m_sb)) + uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + + /* + * AG freelist header block + */ + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), + XFS_FSS_TO_BB(mp, 1), 0, + &xfs_agfl_buf_ops); + if (!bp) { + error = -ENOMEM; + goto error0; + } + + agfl = XFS_BUF_TO_AGFL(bp); + if (xfs_sb_version_hascrc(&mp->m_sb)) { + agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); + agfl->agfl_seqno = cpu_to_be32(agno); + uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid); + } + + agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp); + for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++) + agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + + /* + * AG inode header block + */ + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), + XFS_FSS_TO_BB(mp, 1), 0, + &xfs_agi_buf_ops); + if (!bp) { + error = -ENOMEM; + goto error0; + } + + agi = XFS_BUF_TO_AGI(bp); + agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); + agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); + agi->agi_seqno = cpu_to_be32(agno); + agi->agi_length = cpu_to_be32(agsize); + agi->agi_count = 0; + agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); + agi->agi_level = cpu_to_be32(1); + agi->agi_freecount = 0; + agi->agi_newino = cpu_to_be32(NULLAGINO); + agi->agi_dirino = cpu_to_be32(NULLAGINO); + if (xfs_sb_version_hascrc(&mp->m_sb)) + uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid); + if (xfs_sb_version_hasfinobt(&mp->m_sb)) { + agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); + agi->agi_free_level = cpu_to_be32(1); + } + for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) + agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + + /* + * BNO btree root block + */ + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)), + BTOBB(mp->m_sb.sb_blocksize), 0, + &xfs_allocbt_buf_ops); + + if (!bp) { + error = -ENOMEM; + goto error0; + } + + if (xfs_sb_version_hascrc(&mp->m_sb)) + xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1, + agno, XFS_BTREE_CRC_BLOCKS); + else + xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1, + agno, 0); + + arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); + arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); + arec->ar_blockcount = cpu_to_be32( + agsize - be32_to_cpu(arec->ar_startblock)); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + + /* + * CNT btree root block + */ + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)), + BTOBB(mp->m_sb.sb_blocksize), 0, + &xfs_allocbt_buf_ops); + if (!bp) { + error = -ENOMEM; + goto error0; + } + + if (xfs_sb_version_hascrc(&mp->m_sb)) + xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1, + agno, XFS_BTREE_CRC_BLOCKS); + else + xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1, + agno, 0); + + arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); + arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp)); + arec->ar_blockcount = cpu_to_be32( + agsize - be32_to_cpu(arec->ar_startblock)); + nfree += be32_to_cpu(arec->ar_blockcount); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + + /* + * INO btree root block + */ + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)), + BTOBB(mp->m_sb.sb_blocksize), 0, + &xfs_inobt_buf_ops); + if (!bp) { + error = -ENOMEM; + goto error0; + } + + if (xfs_sb_version_hascrc(&mp->m_sb)) + xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0, + agno, XFS_BTREE_CRC_BLOCKS); + else + xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0, + agno, 0); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + + /* + * FINO btree root block + */ + if (xfs_sb_version_hasfinobt(&mp->m_sb)) { + bp = xfs_growfs_get_hdr_buf(mp, + XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)), + BTOBB(mp->m_sb.sb_blocksize), 0, + &xfs_inobt_buf_ops); + if (!bp) { + error = -ENOMEM; + goto error0; + } + + if (xfs_sb_version_hascrc(&mp->m_sb)) + xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC, + 0, 0, agno, + XFS_BTREE_CRC_BLOCKS); + else + xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0, + 0, agno, 0); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) + goto error0; + } + + } + xfs_trans_agblocks_delta(tp, nfree); + /* + * There are new blocks in the old last a.g. + */ + if (new) { + /* + * Change the agi length. + */ + error = xfs_ialloc_read_agi(mp, tp, agno, &bp); + if (error) { + goto error0; + } + ASSERT(bp); + agi = XFS_BUF_TO_AGI(bp); + be32_add_cpu(&agi->agi_length, new); + ASSERT(nagcount == oagcount || + be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); + xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); + /* + * Change agf length. + */ + error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp); + if (error) { + goto error0; + } + ASSERT(bp); + agf = XFS_BUF_TO_AGF(bp); + be32_add_cpu(&agf->agf_length, new); + ASSERT(be32_to_cpu(agf->agf_length) == + be32_to_cpu(agi->agi_length)); + + xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); + /* + * Free the new space. + */ + error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno, + be32_to_cpu(agf->agf_length) - new), new); + if (error) { + goto error0; + } + } + + /* + * Update changed superblock fields transactionally. These are not + * seen by the rest of the world until the transaction commit applies + * them atomically to the superblock. + */ + if (nagcount > oagcount) + xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); + if (nb > mp->m_sb.sb_dblocks) + xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, + nb - mp->m_sb.sb_dblocks); + if (nfree) + xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree); + if (dpct) + xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); + xfs_trans_set_sync(tp); + error = xfs_trans_commit(tp, 0); + if (error) + return error; + + /* New allocation groups fully initialized, so update mount struct */ + if (nagimax) + mp->m_maxagi = nagimax; + if (mp->m_sb.sb_imax_pct) { + __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; + do_div(icount, 100); + mp->m_maxicount = icount << mp->m_sb.sb_inopblog; + } else + mp->m_maxicount = 0; + xfs_set_low_space_thresholds(mp); + + /* update secondary superblocks. */ + for (agno = 1; agno < nagcount; agno++) { + error = 0; + /* + * new secondary superblocks need to be zeroed, not read from + * disk as the contents of the new area we are growing into is + * completely unknown. + */ + if (agno < oagcount) { + error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, + XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), + XFS_FSS_TO_BB(mp, 1), 0, &bp, + &xfs_sb_buf_ops); + } else { + bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp, + XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)), + XFS_FSS_TO_BB(mp, 1), 0); + if (bp) { + bp->b_ops = &xfs_sb_buf_ops; + xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); + } else + error = -ENOMEM; + } + + /* + * If we get an error reading or writing alternate superblocks, + * continue. xfs_repair chooses the "best" superblock based + * on most matches; if we break early, we'll leave more + * superblocks un-updated than updated, and xfs_repair may + * pick them over the properly-updated primary. + */ + if (error) { + xfs_warn(mp, + "error %d reading secondary superblock for ag %d", + error, agno); + saved_error = error; + continue; + } + xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb); + + error = xfs_bwrite(bp); + xfs_buf_relse(bp); + if (error) { + xfs_warn(mp, + "write error %d updating secondary superblock for ag %d", + error, agno); + saved_error = error; + continue; + } + } + return saved_error ? saved_error : error; + + error0: + xfs_trans_cancel(tp, XFS_TRANS_ABORT); + return error; +} + +static int +xfs_growfs_log_private( + xfs_mount_t *mp, /* mount point for filesystem */ + xfs_growfs_log_t *in) /* growfs log input struct */ +{ + xfs_extlen_t nb; + + nb = in->newblocks; + if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) + return -EINVAL; + if (nb == mp->m_sb.sb_logblocks && + in->isint == (mp->m_sb.sb_logstart != 0)) + return -EINVAL; + /* + * Moving the log is hard, need new interfaces to sync + * the log first, hold off all activity while moving it. + * Can have shorter or longer log in the same space, + * or transform internal to external log or vice versa. + */ + return -ENOSYS; +} + +/* + * protected versions of growfs function acquire and release locks on the mount + * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, + * XFS_IOC_FSGROWFSRT + */ + + +int +xfs_growfs_data( + xfs_mount_t *mp, + xfs_growfs_data_t *in) +{ + int error; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (!mutex_trylock(&mp->m_growlock)) + return -EWOULDBLOCK; + error = xfs_growfs_data_private(mp, in); + /* + * Increment the generation unconditionally, the error could be from + * updating the secondary superblocks, in which case the new size + * is live already. + */ + mp->m_generation++; + mutex_unlock(&mp->m_growlock); + return error; +} + +int +xfs_growfs_log( + xfs_mount_t *mp, + xfs_growfs_log_t *in) +{ + int error; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (!mutex_trylock(&mp->m_growlock)) + return -EWOULDBLOCK; + error = xfs_growfs_log_private(mp, in); + mutex_unlock(&mp->m_growlock); + return error; +} + +/* + * exported through ioctl XFS_IOC_FSCOUNTS + */ + +int +xfs_fs_counts( + xfs_mount_t *mp, + xfs_fsop_counts_t *cnt) +{ + cnt->allocino = percpu_counter_read_positive(&mp->m_icount); + cnt->freeino = percpu_counter_read_positive(&mp->m_ifree); + cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) - + XFS_ALLOC_SET_ASIDE(mp); + + spin_lock(&mp->m_sb_lock); + cnt->freertx = mp->m_sb.sb_frextents; + spin_unlock(&mp->m_sb_lock); + return 0; +} + +/* + * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS + * + * xfs_reserve_blocks is called to set m_resblks + * in the in-core mount table. The number of unused reserved blocks + * is kept in m_resblks_avail. + * + * Reserve the requested number of blocks if available. Otherwise return + * as many as possible to satisfy the request. The actual number + * reserved are returned in outval + * + * A null inval pointer indicates that only the current reserved blocks + * available should be returned no settings are changed. + */ + +int +xfs_reserve_blocks( + xfs_mount_t *mp, + __uint64_t *inval, + xfs_fsop_resblks_t *outval) +{ + __int64_t lcounter, delta, fdblks_delta; + __uint64_t request; + + /* If inval is null, report current values and return */ + if (inval == (__uint64_t *)NULL) { + if (!outval) + return -EINVAL; + outval->resblks = mp->m_resblks; + outval->resblks_avail = mp->m_resblks_avail; + return 0; + } + + request = *inval; + + /* + * With per-cpu counters, this becomes an interesting + * problem. we needto work out if we are freeing or allocation + * blocks first, then we can do the modification as necessary. + * + * We do this under the m_sb_lock so that if we are near + * ENOSPC, we will hold out any changes while we work out + * what to do. This means that the amount of free space can + * change while we do this, so we need to retry if we end up + * trying to reserve more space than is available. + */ +retry: + spin_lock(&mp->m_sb_lock); + + /* + * If our previous reservation was larger than the current value, + * then move any unused blocks back to the free pool. + */ + fdblks_delta = 0; + if (mp->m_resblks > request) { + lcounter = mp->m_resblks_avail - request; + if (lcounter > 0) { /* release unused blocks */ + fdblks_delta = lcounter; + mp->m_resblks_avail -= lcounter; + } + mp->m_resblks = request; + } else { + __int64_t free; + + free = percpu_counter_sum(&mp->m_fdblocks) - + XFS_ALLOC_SET_ASIDE(mp); + if (!free) + goto out; /* ENOSPC and fdblks_delta = 0 */ + + delta = request - mp->m_resblks; + lcounter = free - delta; + if (lcounter < 0) { + /* We can't satisfy the request, just get what we can */ + mp->m_resblks += free; + mp->m_resblks_avail += free; + fdblks_delta = -free; + } else { + fdblks_delta = -delta; + mp->m_resblks = request; + mp->m_resblks_avail += delta; + } + } +out: + if (outval) { + outval->resblks = mp->m_resblks; + outval->resblks_avail = mp->m_resblks_avail; + } + spin_unlock(&mp->m_sb_lock); + + if (fdblks_delta) { + /* + * If we are putting blocks back here, m_resblks_avail is + * already at its max so this will put it in the free pool. + * + * If we need space, we'll either succeed in getting it + * from the free block count or we'll get an enospc. If + * we get a ENOSPC, it means things changed while we were + * calculating fdblks_delta and so we should try again to + * see if there is anything left to reserve. + * + * Don't set the reserved flag here - we don't want to reserve + * the extra reserve blocks from the reserve..... + */ + int error; + error = xfs_mod_fdblocks(mp, fdblks_delta, 0); + if (error == -ENOSPC) + goto retry; + } + return 0; +} + +int +xfs_fs_goingdown( + xfs_mount_t *mp, + __uint32_t inflags) +{ + switch (inflags) { + case XFS_FSOP_GOING_FLAGS_DEFAULT: { + struct super_block *sb = freeze_bdev(mp->m_super->s_bdev); + + if (sb && !IS_ERR(sb)) { + xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); + thaw_bdev(sb->s_bdev, sb); + } + + break; + } + case XFS_FSOP_GOING_FLAGS_LOGFLUSH: + xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); + break; + case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: + xfs_force_shutdown(mp, + SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); + break; + default: + return -EINVAL; + } + + return 0; +} + +/* + * Force a shutdown of the filesystem instantly while keeping the filesystem + * consistent. We don't do an unmount here; just shutdown the shop, make sure + * that absolutely nothing persistent happens to this filesystem after this + * point. + */ +void +xfs_do_force_shutdown( + xfs_mount_t *mp, + int flags, + char *fname, + int lnnum) +{ + int logerror; + + logerror = flags & SHUTDOWN_LOG_IO_ERROR; + + if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { + xfs_notice(mp, + "%s(0x%x) called from line %d of file %s. Return address = 0x%p", + __func__, flags, lnnum, fname, __return_address); + } + /* + * No need to duplicate efforts. + */ + if (XFS_FORCED_SHUTDOWN(mp) && !logerror) + return; + + /* + * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't + * queue up anybody new on the log reservations, and wakes up + * everybody who's sleeping on log reservations to tell them + * the bad news. + */ + if (xfs_log_force_umount(mp, logerror)) + return; + + if (flags & SHUTDOWN_CORRUPT_INCORE) { + xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT, + "Corruption of in-memory data detected. Shutting down filesystem"); + if (XFS_ERRLEVEL_HIGH <= xfs_error_level) + xfs_stack_trace(); + } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { + if (logerror) { + xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR, + "Log I/O Error Detected. Shutting down filesystem"); + } else if (flags & SHUTDOWN_DEVICE_REQ) { + xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, + "All device paths lost. Shutting down filesystem"); + } else if (!(flags & SHUTDOWN_REMOTE_REQ)) { + xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR, + "I/O Error Detected. Shutting down filesystem"); + } + } + if (!(flags & SHUTDOWN_FORCE_UMOUNT)) { + xfs_alert(mp, + "Please umount the filesystem and rectify the problem(s)"); + } +} |