2013-04-03 07:11:18 +02:00
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* Copyright (c) 2012-2013 Red Hat, Inc.
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir2.h"
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#include "xfs_mount.h"
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#include "xfs_da_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_itable.h"
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#include "xfs_ialloc.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_utils.h"
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#include "xfs_trans_space.h"
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#include "xfs_log_priv.h"
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#include "xfs_trace.h"
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#include "xfs_symlink.h"
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2013-04-03 07:11:19 +02:00
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#include "xfs_cksum.h"
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#include "xfs_buf_item.h"
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/*
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* Each contiguous block has a header, so it is not just a simple pathlen
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* to FSB conversion.
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*/
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int
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xfs_symlink_blocks(
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struct xfs_mount *mp,
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int pathlen)
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{
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2013-05-27 08:38:20 +02:00
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int buflen = XFS_SYMLINK_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
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2013-04-03 07:11:19 +02:00
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2013-05-27 08:38:20 +02:00
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return (pathlen + buflen - 1) / buflen;
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2013-04-03 07:11:19 +02:00
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}
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static int
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xfs_symlink_hdr_set(
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struct xfs_mount *mp,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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struct xfs_buf *bp)
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{
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return 0;
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dsl->sl_magic = cpu_to_be32(XFS_SYMLINK_MAGIC);
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dsl->sl_offset = cpu_to_be32(offset);
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dsl->sl_bytes = cpu_to_be32(size);
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uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_uuid);
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dsl->sl_owner = cpu_to_be64(ino);
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dsl->sl_blkno = cpu_to_be64(bp->b_bn);
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bp->b_ops = &xfs_symlink_buf_ops;
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return sizeof(struct xfs_dsymlink_hdr);
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}
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/*
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* Checking of the symlink header is split into two parts. the verifier does
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* CRC, location and bounds checking, the unpacking function checks the path
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* parameters and owner.
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*/
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bool
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xfs_symlink_hdr_ok(
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struct xfs_mount *mp,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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struct xfs_buf *bp)
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{
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (offset != be32_to_cpu(dsl->sl_offset))
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return false;
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if (size != be32_to_cpu(dsl->sl_bytes))
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return false;
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if (ino != be64_to_cpu(dsl->sl_owner))
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return false;
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/* ok */
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return true;
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}
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static bool
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xfs_symlink_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return false;
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if (dsl->sl_magic != cpu_to_be32(XFS_SYMLINK_MAGIC))
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return false;
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if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_uuid))
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return false;
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if (bp->b_bn != be64_to_cpu(dsl->sl_blkno))
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return false;
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if (be32_to_cpu(dsl->sl_offset) +
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be32_to_cpu(dsl->sl_bytes) >= MAXPATHLEN)
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return false;
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if (dsl->sl_owner == 0)
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return false;
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return true;
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}
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static void
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xfs_symlink_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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/* no verification of non-crc buffers */
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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if (!xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
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offsetof(struct xfs_dsymlink_hdr, sl_crc)) ||
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!xfs_symlink_verify(bp)) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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}
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}
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static void
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xfs_symlink_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_buf_log_item *bip = bp->b_fspriv;
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/* no verification of non-crc buffers */
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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if (!xfs_symlink_verify(bp)) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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return;
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}
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if (bip) {
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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dsl->sl_lsn = cpu_to_be64(bip->bli_item.li_lsn);
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}
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xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
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offsetof(struct xfs_dsymlink_hdr, sl_crc));
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}
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const struct xfs_buf_ops xfs_symlink_buf_ops = {
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.verify_read = xfs_symlink_read_verify,
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.verify_write = xfs_symlink_write_verify,
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};
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2013-04-03 07:11:18 +02:00
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void
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xfs_symlink_local_to_remote(
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struct xfs_trans *tp,
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struct xfs_buf *bp,
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struct xfs_inode *ip,
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struct xfs_ifork *ifp)
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{
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2013-04-03 07:11:19 +02:00
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struct xfs_mount *mp = ip->i_mount;
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char *buf;
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if (!xfs_sb_version_hascrc(&mp->m_sb)) {
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bp->b_ops = NULL;
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memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
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return;
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}
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/*
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* As this symlink fits in an inode literal area, it must also fit in
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* the smallest buffer the filesystem supports.
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*/
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ASSERT(BBTOB(bp->b_length) >=
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ifp->if_bytes + sizeof(struct xfs_dsymlink_hdr));
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bp->b_ops = &xfs_symlink_buf_ops;
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buf = bp->b_addr;
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buf += xfs_symlink_hdr_set(mp, ip->i_ino, 0, ifp->if_bytes, bp);
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memcpy(buf, ifp->if_u1.if_data, ifp->if_bytes);
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2013-04-03 07:11:18 +02:00
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}
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/* ----- Kernel only functions below ----- */
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STATIC int
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xfs_readlink_bmap(
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2013-04-03 07:11:19 +02:00
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struct xfs_inode *ip,
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char *link)
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2013-04-03 07:11:18 +02:00
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{
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2013-04-03 07:11:19 +02:00
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
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struct xfs_buf *bp;
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xfs_daddr_t d;
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char *cur_chunk;
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int pathlen = ip->i_d.di_size;
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int nmaps = XFS_SYMLINK_MAPS;
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int byte_cnt;
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int n;
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int error = 0;
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int fsblocks = 0;
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int offset;
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2013-04-03 07:11:18 +02:00
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2013-04-03 07:11:19 +02:00
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fsblocks = xfs_symlink_blocks(mp, pathlen);
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error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
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2013-04-03 07:11:18 +02:00
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if (error)
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goto out;
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2013-04-03 07:11:19 +02:00
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offset = 0;
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2013-04-03 07:11:18 +02:00
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for (n = 0; n < nmaps; n++) {
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d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
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byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
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2013-04-03 07:11:19 +02:00
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bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,
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&xfs_symlink_buf_ops);
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2013-04-03 07:11:18 +02:00
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if (!bp)
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return XFS_ERROR(ENOMEM);
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error = bp->b_error;
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if (error) {
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xfs_buf_ioerror_alert(bp, __func__);
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xfs_buf_relse(bp);
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goto out;
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}
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2013-04-03 07:11:19 +02:00
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byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
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2013-04-03 07:11:18 +02:00
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if (pathlen < byte_cnt)
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byte_cnt = pathlen;
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2013-04-03 07:11:19 +02:00
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cur_chunk = bp->b_addr;
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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if (!xfs_symlink_hdr_ok(mp, ip->i_ino, offset,
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byte_cnt, bp)) {
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error = EFSCORRUPTED;
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xfs_alert(mp,
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"symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)",
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offset, byte_cnt, ip->i_ino);
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xfs_buf_relse(bp);
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goto out;
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}
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cur_chunk += sizeof(struct xfs_dsymlink_hdr);
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}
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memcpy(link + offset, bp->b_addr, byte_cnt);
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2013-04-03 07:11:18 +02:00
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pathlen -= byte_cnt;
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2013-04-03 07:11:19 +02:00
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offset += byte_cnt;
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2013-04-03 07:11:18 +02:00
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xfs_buf_relse(bp);
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}
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2013-04-03 07:11:19 +02:00
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ASSERT(pathlen == 0);
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2013-04-03 07:11:18 +02:00
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link[ip->i_d.di_size] = '\0';
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error = 0;
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out:
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return error;
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}
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int
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xfs_readlink(
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2013-04-03 07:11:19 +02:00
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struct xfs_inode *ip,
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2013-04-03 07:11:18 +02:00
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char *link)
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{
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2013-04-03 07:11:19 +02:00
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struct xfs_mount *mp = ip->i_mount;
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2013-04-03 07:11:18 +02:00
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xfs_fsize_t pathlen;
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int error = 0;
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trace_xfs_readlink(ip);
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if (XFS_FORCED_SHUTDOWN(mp))
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return XFS_ERROR(EIO);
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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pathlen = ip->i_d.di_size;
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if (!pathlen)
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goto out;
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if (pathlen < 0 || pathlen > MAXPATHLEN) {
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xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
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__func__, (unsigned long long) ip->i_ino,
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(long long) pathlen);
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ASSERT(0);
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error = XFS_ERROR(EFSCORRUPTED);
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goto out;
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}
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if (ip->i_df.if_flags & XFS_IFINLINE) {
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memcpy(link, ip->i_df.if_u1.if_data, pathlen);
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link[pathlen] = '\0';
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} else {
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error = xfs_readlink_bmap(ip, link);
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}
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out:
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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return error;
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}
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int
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xfs_symlink(
|
2013-04-03 07:11:19 +02:00
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struct xfs_inode *dp,
|
2013-04-03 07:11:18 +02:00
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struct xfs_name *link_name,
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const char *target_path,
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umode_t mode,
|
2013-04-03 07:11:19 +02:00
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struct xfs_inode **ipp)
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2013-04-03 07:11:18 +02:00
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{
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2013-04-03 07:11:19 +02:00
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struct xfs_mount *mp = dp->i_mount;
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struct xfs_trans *tp = NULL;
|
|
|
|
struct xfs_inode *ip = NULL;
|
|
|
|
int error = 0;
|
2013-04-03 07:11:18 +02:00
|
|
|
int pathlen;
|
2013-04-03 07:11:19 +02:00
|
|
|
struct xfs_bmap_free free_list;
|
2013-04-03 07:11:18 +02:00
|
|
|
xfs_fsblock_t first_block;
|
2013-04-03 07:11:19 +02:00
|
|
|
bool unlock_dp_on_error = false;
|
2013-04-03 07:11:18 +02:00
|
|
|
uint cancel_flags;
|
|
|
|
int committed;
|
|
|
|
xfs_fileoff_t first_fsb;
|
|
|
|
xfs_filblks_t fs_blocks;
|
|
|
|
int nmaps;
|
2013-04-03 07:11:19 +02:00
|
|
|
struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
|
2013-04-03 07:11:18 +02:00
|
|
|
xfs_daddr_t d;
|
|
|
|
const char *cur_chunk;
|
|
|
|
int byte_cnt;
|
|
|
|
int n;
|
|
|
|
xfs_buf_t *bp;
|
|
|
|
prid_t prid;
|
2013-06-28 00:25:07 +02:00
|
|
|
struct xfs_dquot *udqp = NULL;
|
|
|
|
struct xfs_dquot *gdqp = NULL;
|
2013-07-11 07:00:40 +02:00
|
|
|
struct xfs_dquot *pdqp = NULL;
|
2013-04-03 07:11:18 +02:00
|
|
|
uint resblks;
|
|
|
|
|
|
|
|
*ipp = NULL;
|
|
|
|
|
|
|
|
trace_xfs_symlink(dp, link_name);
|
|
|
|
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
|
|
return XFS_ERROR(EIO);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check component lengths of the target path name.
|
|
|
|
*/
|
|
|
|
pathlen = strlen(target_path);
|
|
|
|
if (pathlen >= MAXPATHLEN) /* total string too long */
|
|
|
|
return XFS_ERROR(ENAMETOOLONG);
|
|
|
|
|
|
|
|
udqp = gdqp = NULL;
|
|
|
|
if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
|
|
|
|
prid = xfs_get_projid(dp);
|
|
|
|
else
|
|
|
|
prid = XFS_PROJID_DEFAULT;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Make sure that we have allocated dquot(s) on disk.
|
|
|
|
*/
|
|
|
|
error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
|
2013-07-11 07:00:40 +02:00
|
|
|
XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp, &pdqp);
|
2013-04-03 07:11:18 +02:00
|
|
|
if (error)
|
|
|
|
goto std_return;
|
|
|
|
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
|
|
|
|
cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
|
|
|
|
/*
|
|
|
|
* The symlink will fit into the inode data fork?
|
|
|
|
* There can't be any attributes so we get the whole variable part.
|
|
|
|
*/
|
|
|
|
if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version))
|
|
|
|
fs_blocks = 0;
|
|
|
|
else
|
2013-05-27 08:38:20 +02:00
|
|
|
fs_blocks = xfs_symlink_blocks(mp, pathlen);
|
2013-04-03 07:11:18 +02:00
|
|
|
resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
|
|
|
|
error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
|
|
|
|
XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
|
|
|
|
if (error == ENOSPC && fs_blocks == 0) {
|
|
|
|
resblks = 0;
|
|
|
|
error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
|
|
|
|
XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
|
|
|
|
}
|
|
|
|
if (error) {
|
|
|
|
cancel_flags = 0;
|
|
|
|
goto error_return;
|
|
|
|
}
|
|
|
|
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
|
|
|
|
unlock_dp_on_error = true;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check whether the directory allows new symlinks or not.
|
|
|
|
*/
|
|
|
|
if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
|
|
|
|
error = XFS_ERROR(EPERM);
|
|
|
|
goto error_return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Reserve disk quota : blocks and inode.
|
|
|
|
*/
|
2013-07-11 07:00:40 +02:00
|
|
|
error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
|
|
|
|
pdqp, resblks, 1, 0);
|
2013-04-03 07:11:18 +02:00
|
|
|
if (error)
|
|
|
|
goto error_return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for ability to enter directory entry, if no space reserved.
|
|
|
|
*/
|
|
|
|
error = xfs_dir_canenter(tp, dp, link_name, resblks);
|
|
|
|
if (error)
|
|
|
|
goto error_return;
|
|
|
|
/*
|
|
|
|
* Initialize the bmap freelist prior to calling either
|
|
|
|
* bmapi or the directory create code.
|
|
|
|
*/
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Allocate an inode for the symlink.
|
|
|
|
*/
|
|
|
|
error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
|
|
|
|
prid, resblks > 0, &ip, NULL);
|
|
|
|
if (error) {
|
|
|
|
if (error == ENOSPC)
|
|
|
|
goto error_return;
|
|
|
|
goto error1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* An error after we've joined dp to the transaction will result in the
|
|
|
|
* transaction cancel unlocking dp so don't do it explicitly in the
|
|
|
|
* error path.
|
|
|
|
*/
|
|
|
|
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
|
|
|
|
unlock_dp_on_error = false;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Also attach the dquot(s) to it, if applicable.
|
|
|
|
*/
|
2013-07-11 07:00:40 +02:00
|
|
|
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
|
2013-04-03 07:11:18 +02:00
|
|
|
|
|
|
|
if (resblks)
|
|
|
|
resblks -= XFS_IALLOC_SPACE_RES(mp);
|
|
|
|
/*
|
|
|
|
* If the symlink will fit into the inode, write it inline.
|
|
|
|
*/
|
|
|
|
if (pathlen <= XFS_IFORK_DSIZE(ip)) {
|
|
|
|
xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
|
|
|
|
memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
|
|
|
|
ip->i_d.di_size = pathlen;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The inode was initially created in extent format.
|
|
|
|
*/
|
|
|
|
ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
|
|
|
|
ip->i_df.if_flags |= XFS_IFINLINE;
|
|
|
|
|
|
|
|
ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
|
|
|
|
|
|
|
|
} else {
|
2013-04-03 07:11:19 +02:00
|
|
|
int offset;
|
|
|
|
|
2013-04-03 07:11:18 +02:00
|
|
|
first_fsb = 0;
|
|
|
|
nmaps = XFS_SYMLINK_MAPS;
|
|
|
|
|
|
|
|
error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
|
|
|
|
XFS_BMAPI_METADATA, &first_block, resblks,
|
|
|
|
mval, &nmaps, &free_list);
|
|
|
|
if (error)
|
|
|
|
goto error2;
|
|
|
|
|
|
|
|
if (resblks)
|
|
|
|
resblks -= fs_blocks;
|
|
|
|
ip->i_d.di_size = pathlen;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
|
|
|
|
cur_chunk = target_path;
|
2013-04-03 07:11:19 +02:00
|
|
|
offset = 0;
|
2013-04-03 07:11:18 +02:00
|
|
|
for (n = 0; n < nmaps; n++) {
|
2013-05-27 08:38:20 +02:00
|
|
|
char *buf;
|
2013-04-03 07:11:19 +02:00
|
|
|
|
2013-04-03 07:11:18 +02:00
|
|
|
d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
|
|
|
|
byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
|
|
|
|
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
|
|
|
|
BTOBB(byte_cnt), 0);
|
|
|
|
if (!bp) {
|
|
|
|
error = ENOMEM;
|
|
|
|
goto error2;
|
|
|
|
}
|
2013-04-03 07:11:19 +02:00
|
|
|
bp->b_ops = &xfs_symlink_buf_ops;
|
|
|
|
|
|
|
|
byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
|
2013-05-27 08:38:20 +02:00
|
|
|
byte_cnt = min(byte_cnt, pathlen);
|
2013-04-03 07:11:18 +02:00
|
|
|
|
2013-04-03 07:11:19 +02:00
|
|
|
buf = bp->b_addr;
|
|
|
|
buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
|
|
|
|
byte_cnt, bp);
|
|
|
|
|
|
|
|
memcpy(buf, cur_chunk, byte_cnt);
|
|
|
|
|
2013-04-03 07:11:18 +02:00
|
|
|
cur_chunk += byte_cnt;
|
2013-04-03 07:11:19 +02:00
|
|
|
pathlen -= byte_cnt;
|
|
|
|
offset += byte_cnt;
|
2013-04-03 07:11:18 +02:00
|
|
|
|
2013-04-03 07:11:19 +02:00
|
|
|
xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
|
|
|
|
(char *)bp->b_addr);
|
2013-04-03 07:11:18 +02:00
|
|
|
}
|
2013-05-27 08:38:20 +02:00
|
|
|
ASSERT(pathlen == 0);
|
2013-04-03 07:11:18 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create the directory entry for the symlink.
|
|
|
|
*/
|
|
|
|
error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
|
|
|
|
&first_block, &free_list, resblks);
|
|
|
|
if (error)
|
|
|
|
goto error2;
|
|
|
|
xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
|
|
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If this is a synchronous mount, make sure that the
|
|
|
|
* symlink transaction goes to disk before returning to
|
|
|
|
* the user.
|
|
|
|
*/
|
|
|
|
if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
|
|
|
|
xfs_trans_set_sync(tp);
|
|
|
|
}
|
|
|
|
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
|
|
if (error) {
|
|
|
|
goto error2;
|
|
|
|
}
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
|
|
xfs_qm_dqrele(udqp);
|
|
|
|
xfs_qm_dqrele(gdqp);
|
2013-07-11 07:00:40 +02:00
|
|
|
xfs_qm_dqrele(pdqp);
|
2013-04-03 07:11:18 +02:00
|
|
|
|
|
|
|
*ipp = ip;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error2:
|
|
|
|
IRELE(ip);
|
|
|
|
error1:
|
|
|
|
xfs_bmap_cancel(&free_list);
|
|
|
|
cancel_flags |= XFS_TRANS_ABORT;
|
|
|
|
error_return:
|
|
|
|
xfs_trans_cancel(tp, cancel_flags);
|
|
|
|
xfs_qm_dqrele(udqp);
|
|
|
|
xfs_qm_dqrele(gdqp);
|
2013-07-11 07:00:40 +02:00
|
|
|
xfs_qm_dqrele(pdqp);
|
2013-04-03 07:11:18 +02:00
|
|
|
|
|
|
|
if (unlock_dp_on_error)
|
|
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
|
|
std_return:
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Free a symlink that has blocks associated with it.
|
|
|
|
*/
|
2013-06-17 22:35:57 +02:00
|
|
|
STATIC int
|
2013-04-03 07:11:18 +02:00
|
|
|
xfs_inactive_symlink_rmt(
|
|
|
|
xfs_inode_t *ip,
|
|
|
|
xfs_trans_t **tpp)
|
|
|
|
{
|
|
|
|
xfs_buf_t *bp;
|
|
|
|
int committed;
|
|
|
|
int done;
|
|
|
|
int error;
|
|
|
|
xfs_fsblock_t first_block;
|
|
|
|
xfs_bmap_free_t free_list;
|
|
|
|
int i;
|
|
|
|
xfs_mount_t *mp;
|
|
|
|
xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
|
|
|
|
int nmaps;
|
|
|
|
xfs_trans_t *ntp;
|
|
|
|
int size;
|
|
|
|
xfs_trans_t *tp;
|
|
|
|
|
|
|
|
tp = *tpp;
|
|
|
|
mp = ip->i_mount;
|
2013-06-17 22:35:57 +02:00
|
|
|
ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);
|
2013-04-03 07:11:18 +02:00
|
|
|
/*
|
|
|
|
* We're freeing a symlink that has some
|
|
|
|
* blocks allocated to it. Free the
|
|
|
|
* blocks here. We know that we've got
|
|
|
|
* either 1 or 2 extents and that we can
|
|
|
|
* free them all in one bunmapi call.
|
|
|
|
*/
|
|
|
|
ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Lock the inode, fix the size, and join it to the transaction.
|
|
|
|
* Hold it so in the normal path, we still have it locked for
|
|
|
|
* the second transaction. In the error paths we need it
|
|
|
|
* held so the cancel won't rele it, see below.
|
|
|
|
*/
|
|
|
|
size = (int)ip->i_d.di_size;
|
|
|
|
ip->i_d.di_size = 0;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
/*
|
|
|
|
* Find the block(s) so we can inval and unmap them.
|
|
|
|
*/
|
|
|
|
done = 0;
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
|
|
nmaps = ARRAY_SIZE(mval);
|
2013-04-03 07:11:19 +02:00
|
|
|
error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
|
2013-04-03 07:11:18 +02:00
|
|
|
mval, &nmaps, 0);
|
|
|
|
if (error)
|
|
|
|
goto error0;
|
|
|
|
/*
|
2013-04-03 07:11:19 +02:00
|
|
|
* Invalidate the block(s). No validation is done.
|
2013-04-03 07:11:18 +02:00
|
|
|
*/
|
|
|
|
for (i = 0; i < nmaps; i++) {
|
|
|
|
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
|
|
|
|
XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
|
|
|
|
XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
|
|
|
|
if (!bp) {
|
|
|
|
error = ENOMEM;
|
|
|
|
goto error1;
|
|
|
|
}
|
|
|
|
xfs_trans_binval(tp, bp);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Unmap the dead block(s) to the free_list.
|
|
|
|
*/
|
|
|
|
if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
|
|
|
|
&first_block, &free_list, &done)))
|
|
|
|
goto error1;
|
|
|
|
ASSERT(done);
|
|
|
|
/*
|
|
|
|
* Commit the first transaction. This logs the EFI and the inode.
|
|
|
|
*/
|
|
|
|
if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
|
|
|
|
goto error1;
|
|
|
|
/*
|
|
|
|
* The transaction must have been committed, since there were
|
|
|
|
* actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
|
|
|
|
* The new tp has the extent freeing and EFDs.
|
|
|
|
*/
|
|
|
|
ASSERT(committed);
|
|
|
|
/*
|
|
|
|
* The first xact was committed, so add the inode to the new one.
|
|
|
|
* Mark it dirty so it will be logged and moved forward in the log as
|
|
|
|
* part of every commit.
|
|
|
|
*/
|
|
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
/*
|
|
|
|
* Get a new, empty transaction to return to our caller.
|
|
|
|
*/
|
|
|
|
ntp = xfs_trans_dup(tp);
|
|
|
|
/*
|
|
|
|
* Commit the transaction containing extent freeing and EFDs.
|
|
|
|
* If we get an error on the commit here or on the reserve below,
|
|
|
|
* we need to unlock the inode since the new transaction doesn't
|
|
|
|
* have the inode attached.
|
|
|
|
*/
|
|
|
|
error = xfs_trans_commit(tp, 0);
|
|
|
|
tp = ntp;
|
|
|
|
if (error) {
|
|
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
|
|
goto error0;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* transaction commit worked ok so we can drop the extra ticket
|
|
|
|
* reference that we gained in xfs_trans_dup()
|
|
|
|
*/
|
|
|
|
xfs_log_ticket_put(tp->t_ticket);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remove the memory for extent descriptions (just bookkeeping).
|
|
|
|
*/
|
|
|
|
if (ip->i_df.if_bytes)
|
|
|
|
xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
|
|
|
|
ASSERT(ip->i_df.if_bytes == 0);
|
|
|
|
/*
|
|
|
|
* Put an itruncate log reservation in the new transaction
|
|
|
|
* for our caller.
|
|
|
|
*/
|
|
|
|
if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
|
|
|
|
XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
|
|
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
|
|
goto error0;
|
|
|
|
}
|
|
|
|
|
|
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
*tpp = tp;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error1:
|
|
|
|
xfs_bmap_cancel(&free_list);
|
|
|
|
error0:
|
|
|
|
return error;
|
|
|
|
}
|
2013-06-17 22:35:57 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* xfs_inactive_symlink - free a symlink
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
xfs_inactive_symlink(
|
|
|
|
struct xfs_inode *ip,
|
|
|
|
struct xfs_trans **tp)
|
|
|
|
{
|
|
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
int pathlen;
|
|
|
|
|
|
|
|
trace_xfs_inactive_symlink(ip);
|
|
|
|
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
|
|
return XFS_ERROR(EIO);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Zero length symlinks _can_ exist.
|
|
|
|
*/
|
|
|
|
pathlen = (int)ip->i_d.di_size;
|
|
|
|
if (!pathlen)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (pathlen < 0 || pathlen > MAXPATHLEN) {
|
|
|
|
xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
|
|
|
|
__func__, (unsigned long long)ip->i_ino, pathlen);
|
|
|
|
ASSERT(0);
|
|
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ip->i_df.if_flags & XFS_IFINLINE) {
|
|
|
|
if (ip->i_df.if_bytes > 0)
|
|
|
|
xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
|
|
|
|
XFS_DATA_FORK);
|
|
|
|
ASSERT(ip->i_df.if_bytes == 0);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* remove the remote symlink */
|
|
|
|
return xfs_inactive_symlink_rmt(ip, tp);
|
|
|
|
}
|