libxfs: move source files

Move all the source files that are shared with userspace into
libxfs/. This is done as one big chunk simpy to get it done
quickly

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 628 insertions, 0 deletions

diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
new file mode 100644
index 000000000000..a8bbc562ff35
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -0,0 +1,628 @@
+/*
+ * 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_sb.h"
+#include "xfs_ag.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;
+}