From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- fs/xfs/libxfs/xfs_attr_remote.c | 626 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 626 insertions(+) create mode 100644 fs/xfs/libxfs/xfs_attr_remote.c (limited to 'fs/xfs/libxfs/xfs_attr_remote.c') diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c new file mode 100644 index 000000000..20de88d1b --- /dev/null +++ b/fs/xfs/libxfs/xfs_attr_remote.c @@ -0,0 +1,626 @@ +/* + * Copyright (c) 2000-2005 Silicon Graphics, Inc. + * Copyright (c) 2013 Red Hat, 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_bit.h" +#include "xfs_mount.h" +#include "xfs_da_format.h" +#include "xfs_da_btree.h" +#include "xfs_inode.h" +#include "xfs_alloc.h" +#include "xfs_trans.h" +#include "xfs_inode_item.h" +#include "xfs_bmap.h" +#include "xfs_bmap_util.h" +#include "xfs_attr.h" +#include "xfs_attr_leaf.h" +#include "xfs_attr_remote.h" +#include "xfs_trans_space.h" +#include "xfs_trace.h" +#include "xfs_cksum.h" +#include "xfs_buf_item.h" +#include "xfs_error.h" + +#define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ + +/* + * Each contiguous block has a header, so it is not just a simple attribute + * length to FSB conversion. + */ +int +xfs_attr3_rmt_blocks( + struct xfs_mount *mp, + int attrlen) +{ + if (xfs_sb_version_hascrc(&mp->m_sb)) { + int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize); + return (attrlen + buflen - 1) / buflen; + } + return XFS_B_TO_FSB(mp, attrlen); +} + +/* + * Checking of the remote attribute header is split into two parts. The verifier + * does CRC, location and bounds checking, the unpacking function checks the + * attribute parameters and owner. + */ +static bool +xfs_attr3_rmt_hdr_ok( + void *ptr, + xfs_ino_t ino, + uint32_t offset, + uint32_t size, + xfs_daddr_t bno) +{ + struct xfs_attr3_rmt_hdr *rmt = ptr; + + if (bno != be64_to_cpu(rmt->rm_blkno)) + return false; + if (offset != be32_to_cpu(rmt->rm_offset)) + return false; + if (size != be32_to_cpu(rmt->rm_bytes)) + return false; + if (ino != be64_to_cpu(rmt->rm_owner)) + return false; + + /* ok */ + return true; +} + +static bool +xfs_attr3_rmt_verify( + struct xfs_mount *mp, + void *ptr, + int fsbsize, + xfs_daddr_t bno) +{ + struct xfs_attr3_rmt_hdr *rmt = ptr; + + if (!xfs_sb_version_hascrc(&mp->m_sb)) + return false; + if (rmt->rm_magic != cpu_to_be32(XFS_ATTR3_RMT_MAGIC)) + return false; + if (!uuid_equal(&rmt->rm_uuid, &mp->m_sb.sb_uuid)) + return false; + if (be64_to_cpu(rmt->rm_blkno) != bno) + return false; + if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt)) + return false; + if (be32_to_cpu(rmt->rm_offset) + + be32_to_cpu(rmt->rm_bytes) > XATTR_SIZE_MAX) + return false; + if (rmt->rm_owner == 0) + return false; + + return true; +} + +static void +xfs_attr3_rmt_read_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + char *ptr; + int len; + xfs_daddr_t bno; + int blksize = mp->m_attr_geo->blksize; + + /* no verification of non-crc buffers */ + if (!xfs_sb_version_hascrc(&mp->m_sb)) + return; + + ptr = bp->b_addr; + bno = bp->b_bn; + len = BBTOB(bp->b_length); + ASSERT(len >= blksize); + + while (len > 0) { + if (!xfs_verify_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF)) { + xfs_buf_ioerror(bp, -EFSBADCRC); + break; + } + if (!xfs_attr3_rmt_verify(mp, ptr, blksize, bno)) { + xfs_buf_ioerror(bp, -EFSCORRUPTED); + break; + } + len -= blksize; + ptr += blksize; + bno += BTOBB(blksize); + } + + if (bp->b_error) + xfs_verifier_error(bp); + else + ASSERT(len == 0); +} + +static void +xfs_attr3_rmt_write_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + struct xfs_buf_log_item *bip = bp->b_fspriv; + char *ptr; + int len; + xfs_daddr_t bno; + int blksize = mp->m_attr_geo->blksize; + + /* no verification of non-crc buffers */ + if (!xfs_sb_version_hascrc(&mp->m_sb)) + return; + + ptr = bp->b_addr; + bno = bp->b_bn; + len = BBTOB(bp->b_length); + ASSERT(len >= blksize); + + while (len > 0) { + if (!xfs_attr3_rmt_verify(mp, ptr, blksize, bno)) { + xfs_buf_ioerror(bp, -EFSCORRUPTED); + xfs_verifier_error(bp); + return; + } + if (bip) { + struct xfs_attr3_rmt_hdr *rmt; + + rmt = (struct xfs_attr3_rmt_hdr *)ptr; + rmt->rm_lsn = cpu_to_be64(bip->bli_item.li_lsn); + } + xfs_update_cksum(ptr, blksize, XFS_ATTR3_RMT_CRC_OFF); + + len -= blksize; + ptr += blksize; + bno += BTOBB(blksize); + } + ASSERT(len == 0); +} + +const struct xfs_buf_ops xfs_attr3_rmt_buf_ops = { + .verify_read = xfs_attr3_rmt_read_verify, + .verify_write = xfs_attr3_rmt_write_verify, +}; + +STATIC int +xfs_attr3_rmt_hdr_set( + struct xfs_mount *mp, + void *ptr, + xfs_ino_t ino, + uint32_t offset, + uint32_t size, + xfs_daddr_t bno) +{ + struct xfs_attr3_rmt_hdr *rmt = ptr; + + if (!xfs_sb_version_hascrc(&mp->m_sb)) + return 0; + + rmt->rm_magic = cpu_to_be32(XFS_ATTR3_RMT_MAGIC); + rmt->rm_offset = cpu_to_be32(offset); + rmt->rm_bytes = cpu_to_be32(size); + uuid_copy(&rmt->rm_uuid, &mp->m_sb.sb_uuid); + rmt->rm_owner = cpu_to_be64(ino); + rmt->rm_blkno = cpu_to_be64(bno); + + return sizeof(struct xfs_attr3_rmt_hdr); +} + +/* + * Helper functions to copy attribute data in and out of the one disk extents + */ +STATIC int +xfs_attr_rmtval_copyout( + struct xfs_mount *mp, + struct xfs_buf *bp, + xfs_ino_t ino, + int *offset, + int *valuelen, + __uint8_t **dst) +{ + char *src = bp->b_addr; + xfs_daddr_t bno = bp->b_bn; + int len = BBTOB(bp->b_length); + int blksize = mp->m_attr_geo->blksize; + + ASSERT(len >= blksize); + + while (len > 0 && *valuelen > 0) { + int hdr_size = 0; + int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); + + byte_cnt = min(*valuelen, byte_cnt); + + if (xfs_sb_version_hascrc(&mp->m_sb)) { + if (!xfs_attr3_rmt_hdr_ok(src, ino, *offset, + byte_cnt, bno)) { + xfs_alert(mp, +"remote attribute header mismatch bno/off/len/owner (0x%llx/0x%x/Ox%x/0x%llx)", + bno, *offset, byte_cnt, ino); + return -EFSCORRUPTED; + } + hdr_size = sizeof(struct xfs_attr3_rmt_hdr); + } + + memcpy(*dst, src + hdr_size, byte_cnt); + + /* roll buffer forwards */ + len -= blksize; + src += blksize; + bno += BTOBB(blksize); + + /* roll attribute data forwards */ + *valuelen -= byte_cnt; + *dst += byte_cnt; + *offset += byte_cnt; + } + return 0; +} + +STATIC void +xfs_attr_rmtval_copyin( + struct xfs_mount *mp, + struct xfs_buf *bp, + xfs_ino_t ino, + int *offset, + int *valuelen, + __uint8_t **src) +{ + char *dst = bp->b_addr; + xfs_daddr_t bno = bp->b_bn; + int len = BBTOB(bp->b_length); + int blksize = mp->m_attr_geo->blksize; + + ASSERT(len >= blksize); + + while (len > 0 && *valuelen > 0) { + int hdr_size; + int byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, blksize); + + byte_cnt = min(*valuelen, byte_cnt); + hdr_size = xfs_attr3_rmt_hdr_set(mp, dst, ino, *offset, + byte_cnt, bno); + + memcpy(dst + hdr_size, *src, byte_cnt); + + /* + * If this is the last block, zero the remainder of it. + * Check that we are actually the last block, too. + */ + if (byte_cnt + hdr_size < blksize) { + ASSERT(*valuelen - byte_cnt == 0); + ASSERT(len == blksize); + memset(dst + hdr_size + byte_cnt, 0, + blksize - hdr_size - byte_cnt); + } + + /* roll buffer forwards */ + len -= blksize; + dst += blksize; + bno += BTOBB(blksize); + + /* roll attribute data forwards */ + *valuelen -= byte_cnt; + *src += byte_cnt; + *offset += byte_cnt; + } +} + +/* + * Read the value associated with an attribute from the out-of-line buffer + * that we stored it in. + */ +int +xfs_attr_rmtval_get( + struct xfs_da_args *args) +{ + struct xfs_bmbt_irec map[ATTR_RMTVALUE_MAPSIZE]; + struct xfs_mount *mp = args->dp->i_mount; + struct xfs_buf *bp; + xfs_dablk_t lblkno = args->rmtblkno; + __uint8_t *dst = args->value; + int valuelen; + int nmap; + int error; + int blkcnt = args->rmtblkcnt; + int i; + int offset = 0; + + trace_xfs_attr_rmtval_get(args); + + ASSERT(!(args->flags & ATTR_KERNOVAL)); + ASSERT(args->rmtvaluelen == args->valuelen); + + valuelen = args->rmtvaluelen; + while (valuelen > 0) { + nmap = ATTR_RMTVALUE_MAPSIZE; + error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, + blkcnt, map, &nmap, + XFS_BMAPI_ATTRFORK); + if (error) + return error; + ASSERT(nmap >= 1); + + for (i = 0; (i < nmap) && (valuelen > 0); i++) { + xfs_daddr_t dblkno; + int dblkcnt; + + ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && + (map[i].br_startblock != HOLESTARTBLOCK)); + dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); + dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); + error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, + dblkno, dblkcnt, 0, &bp, + &xfs_attr3_rmt_buf_ops); + if (error) + return error; + + error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino, + &offset, &valuelen, + &dst); + xfs_buf_relse(bp); + if (error) + return error; + + /* roll attribute extent map forwards */ + lblkno += map[i].br_blockcount; + blkcnt -= map[i].br_blockcount; + } + } + ASSERT(valuelen == 0); + return 0; +} + +/* + * Write the value associated with an attribute into the out-of-line buffer + * that we have defined for it. + */ +int +xfs_attr_rmtval_set( + struct xfs_da_args *args) +{ + struct xfs_inode *dp = args->dp; + struct xfs_mount *mp = dp->i_mount; + struct xfs_bmbt_irec map; + xfs_dablk_t lblkno; + xfs_fileoff_t lfileoff = 0; + __uint8_t *src = args->value; + int blkcnt; + int valuelen; + int nmap; + int error; + int offset = 0; + + trace_xfs_attr_rmtval_set(args); + + /* + * Find a "hole" in the attribute address space large enough for + * us to drop the new attribute's value into. Because CRC enable + * attributes have headers, we can't just do a straight byte to FSB + * conversion and have to take the header space into account. + */ + blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen); + error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, + XFS_ATTR_FORK); + if (error) + return error; + + args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff; + args->rmtblkcnt = blkcnt; + + /* + * Roll through the "value", allocating blocks on disk as required. + */ + while (blkcnt > 0) { + int committed; + + /* + * Allocate a single extent, up to the size of the value. + */ + xfs_bmap_init(args->flist, args->firstblock); + nmap = 1; + error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno, + blkcnt, + XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, + args->firstblock, args->total, &map, &nmap, + args->flist); + if (!error) { + error = xfs_bmap_finish(&args->trans, args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + return error; + } + + /* + * bmap_finish() may have committed the last trans and started + * a new one. We need the inode to be in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, dp, 0); + + ASSERT(nmap == 1); + ASSERT((map.br_startblock != DELAYSTARTBLOCK) && + (map.br_startblock != HOLESTARTBLOCK)); + lblkno += map.br_blockcount; + blkcnt -= map.br_blockcount; + + /* + * Start the next trans in the chain. + */ + error = xfs_trans_roll(&args->trans, dp); + if (error) + return error; + } + + /* + * Roll through the "value", copying the attribute value to the + * already-allocated blocks. Blocks are written synchronously + * so that we can know they are all on disk before we turn off + * the INCOMPLETE flag. + */ + lblkno = args->rmtblkno; + blkcnt = args->rmtblkcnt; + valuelen = args->rmtvaluelen; + while (valuelen > 0) { + struct xfs_buf *bp; + xfs_daddr_t dblkno; + int dblkcnt; + + ASSERT(blkcnt > 0); + + xfs_bmap_init(args->flist, args->firstblock); + nmap = 1; + error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno, + blkcnt, &map, &nmap, + XFS_BMAPI_ATTRFORK); + if (error) + return error; + ASSERT(nmap == 1); + ASSERT((map.br_startblock != DELAYSTARTBLOCK) && + (map.br_startblock != HOLESTARTBLOCK)); + + dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), + dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); + + bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, 0); + if (!bp) + return -ENOMEM; + bp->b_ops = &xfs_attr3_rmt_buf_ops; + + xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset, + &valuelen, &src); + + error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ + xfs_buf_relse(bp); + if (error) + return error; + + + /* roll attribute extent map forwards */ + lblkno += map.br_blockcount; + blkcnt -= map.br_blockcount; + } + ASSERT(valuelen == 0); + return 0; +} + +/* + * Remove the value associated with an attribute by deleting the + * out-of-line buffer that it is stored on. + */ +int +xfs_attr_rmtval_remove( + struct xfs_da_args *args) +{ + struct xfs_mount *mp = args->dp->i_mount; + xfs_dablk_t lblkno; + int blkcnt; + int error; + int done; + + trace_xfs_attr_rmtval_remove(args); + + /* + * Roll through the "value", invalidating the attribute value's blocks. + */ + lblkno = args->rmtblkno; + blkcnt = args->rmtblkcnt; + while (blkcnt > 0) { + struct xfs_bmbt_irec map; + struct xfs_buf *bp; + xfs_daddr_t dblkno; + int dblkcnt; + int nmap; + + /* + * Try to remember where we decided to put the value. + */ + nmap = 1; + error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, + blkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); + if (error) + return error; + ASSERT(nmap == 1); + ASSERT((map.br_startblock != DELAYSTARTBLOCK) && + (map.br_startblock != HOLESTARTBLOCK)); + + dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), + dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); + + /* + * If the "remote" value is in the cache, remove it. + */ + bp = xfs_incore(mp->m_ddev_targp, dblkno, dblkcnt, XBF_TRYLOCK); + if (bp) { + xfs_buf_stale(bp); + xfs_buf_relse(bp); + bp = NULL; + } + + lblkno += map.br_blockcount; + blkcnt -= map.br_blockcount; + } + + /* + * Keep de-allocating extents until the remote-value region is gone. + */ + lblkno = args->rmtblkno; + blkcnt = args->rmtblkcnt; + done = 0; + while (!done) { + int committed; + + xfs_bmap_init(args->flist, args->firstblock); + error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, + XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, + 1, args->firstblock, args->flist, + &done); + if (!error) { + error = xfs_bmap_finish(&args->trans, args->flist, + &committed); + } + if (error) { + ASSERT(committed); + args->trans = NULL; + xfs_bmap_cancel(args->flist); + return error; + } + + /* + * bmap_finish() may have committed the last trans and started + * a new one. We need the inode to be in all transactions. + */ + if (committed) + xfs_trans_ijoin(args->trans, args->dp, 0); + + /* + * Close out trans and start the next one in the chain. + */ + error = xfs_trans_roll(&args->trans, args->dp); + if (error) + return error; + } + return 0; +} -- cgit v1.2.3