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![Dave Chinner](/assets/img/avatar_default.png)
Convert all the errors the core XFs code to negative error signs like the rest of the kernel and remove all the sign conversion we do in the interface layers. Errors for conversion (and comparison) found via searches like: $ git grep " E" fs/xfs $ git grep "return E" fs/xfs $ git grep " E[A-Z].*;$" fs/xfs Negation points found via searches like: $ git grep "= -[a-z,A-Z]" fs/xfs $ git grep "return -[a-z,A-D,F-Z]" fs/xfs $ git grep " -[a-z].*;" fs/xfs [ with some bits I missed from Brian Foster ] Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
599 lines
14 KiB
C
599 lines
14 KiB
C
/*
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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_shared.h"
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#include "xfs_fs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_dir2.h"
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#include "xfs_inode.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_bmap_btree.h"
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#include "xfs_bmap_util.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_trans_space.h"
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#include "xfs_trace.h"
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#include "xfs_symlink.h"
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#include "xfs_trans.h"
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#include "xfs_log.h"
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#include "xfs_dinode.h"
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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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struct xfs_inode *ip,
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char *link)
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{
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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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fsblocks = xfs_symlink_blocks(mp, pathlen);
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error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
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if (error)
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goto out;
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offset = 0;
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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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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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if (!bp)
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return -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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/* bad CRC means corrupted metadata */
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if (error == -EFSBADCRC)
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error = -EFSCORRUPTED;
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goto out;
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}
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byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
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if (pathlen < byte_cnt)
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byte_cnt = pathlen;
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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(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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pathlen -= byte_cnt;
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offset += byte_cnt;
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xfs_buf_relse(bp);
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}
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ASSERT(pathlen == 0);
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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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struct xfs_inode *ip,
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char *link)
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{
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struct xfs_mount *mp = ip->i_mount;
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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 -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 = -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(
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struct xfs_inode *dp,
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struct xfs_name *link_name,
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const char *target_path,
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umode_t mode,
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struct xfs_inode **ipp)
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{
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struct xfs_mount *mp = dp->i_mount;
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struct xfs_trans *tp = NULL;
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struct xfs_inode *ip = NULL;
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int error = 0;
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int pathlen;
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struct xfs_bmap_free free_list;
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xfs_fsblock_t first_block;
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bool unlock_dp_on_error = false;
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uint cancel_flags;
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int committed;
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xfs_fileoff_t first_fsb;
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xfs_filblks_t fs_blocks;
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int nmaps;
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struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
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xfs_daddr_t d;
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const char *cur_chunk;
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int byte_cnt;
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int n;
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xfs_buf_t *bp;
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prid_t prid;
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struct xfs_dquot *udqp = NULL;
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struct xfs_dquot *gdqp = NULL;
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struct xfs_dquot *pdqp = NULL;
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uint resblks;
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*ipp = NULL;
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trace_xfs_symlink(dp, link_name);
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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/*
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* Check component lengths of the target path name.
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*/
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pathlen = strlen(target_path);
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if (pathlen >= MAXPATHLEN) /* total string too long */
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return -ENAMETOOLONG;
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udqp = gdqp = NULL;
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prid = xfs_get_initial_prid(dp);
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/*
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* Make sure that we have allocated dquot(s) on disk.
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*/
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error = xfs_qm_vop_dqalloc(dp,
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xfs_kuid_to_uid(current_fsuid()),
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xfs_kgid_to_gid(current_fsgid()), prid,
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XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
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&udqp, &gdqp, &pdqp);
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if (error)
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goto std_return;
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tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
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cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
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/*
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* The symlink will fit into the inode data fork?
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* There can't be any attributes so we get the whole variable part.
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*/
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if (pathlen <= XFS_LITINO(mp, dp->i_d.di_version))
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fs_blocks = 0;
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else
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fs_blocks = xfs_symlink_blocks(mp, pathlen);
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resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
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error = xfs_trans_reserve(tp, &M_RES(mp)->tr_symlink, resblks, 0);
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if (error == -ENOSPC && fs_blocks == 0) {
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resblks = 0;
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error = xfs_trans_reserve(tp, &M_RES(mp)->tr_symlink, 0, 0);
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}
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if (error) {
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cancel_flags = 0;
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goto error_return;
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}
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xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
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unlock_dp_on_error = true;
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/*
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* Check whether the directory allows new symlinks or not.
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*/
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if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
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error = -EPERM;
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goto error_return;
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}
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/*
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* Reserve disk quota : blocks and inode.
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*/
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error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
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pdqp, resblks, 1, 0);
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if (error)
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goto error_return;
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/*
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* Check for ability to enter directory entry, if no space reserved.
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*/
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error = xfs_dir_canenter(tp, dp, link_name, resblks);
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if (error)
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goto error_return;
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/*
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* Initialize the bmap freelist prior to calling either
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* bmapi or the directory create code.
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*/
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xfs_bmap_init(&free_list, &first_block);
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/*
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* Allocate an inode for the symlink.
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*/
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error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
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prid, resblks > 0, &ip, NULL);
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if (error) {
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if (error == -ENOSPC)
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goto error_return;
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goto error1;
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}
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/*
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* An error after we've joined dp to the transaction will result in the
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* transaction cancel unlocking dp so don't do it explicitly in the
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* error path.
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*/
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xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
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unlock_dp_on_error = false;
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/*
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* Also attach the dquot(s) to it, if applicable.
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*/
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xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
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if (resblks)
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resblks -= XFS_IALLOC_SPACE_RES(mp);
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/*
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* If the symlink will fit into the inode, write it inline.
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*/
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if (pathlen <= XFS_IFORK_DSIZE(ip)) {
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xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
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memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
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ip->i_d.di_size = pathlen;
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/*
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* The inode was initially created in extent format.
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*/
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ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
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ip->i_df.if_flags |= XFS_IFINLINE;
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ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
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xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
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} else {
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int offset;
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first_fsb = 0;
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nmaps = XFS_SYMLINK_MAPS;
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error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
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XFS_BMAPI_METADATA, &first_block, resblks,
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mval, &nmaps, &free_list);
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if (error)
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goto error2;
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if (resblks)
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resblks -= fs_blocks;
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ip->i_d.di_size = pathlen;
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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cur_chunk = target_path;
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offset = 0;
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for (n = 0; n < nmaps; n++) {
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char *buf;
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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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bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
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BTOBB(byte_cnt), 0);
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if (!bp) {
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error = -ENOMEM;
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goto error2;
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}
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bp->b_ops = &xfs_symlink_buf_ops;
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byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
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byte_cnt = min(byte_cnt, pathlen);
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buf = bp->b_addr;
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buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
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byte_cnt, bp);
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memcpy(buf, cur_chunk, byte_cnt);
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cur_chunk += byte_cnt;
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pathlen -= byte_cnt;
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offset += byte_cnt;
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xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
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xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
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(char *)bp->b_addr);
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}
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ASSERT(pathlen == 0);
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}
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/*
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* Create the directory entry for the symlink.
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*/
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error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
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&first_block, &free_list, resblks);
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if (error)
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goto error2;
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xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
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/*
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* If this is a synchronous mount, make sure that the
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* symlink transaction goes to disk before returning to
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* the user.
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*/
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if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
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xfs_trans_set_sync(tp);
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}
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error = xfs_bmap_finish(&tp, &free_list, &committed);
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if (error) {
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goto error2;
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}
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error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
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xfs_qm_dqrele(udqp);
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xfs_qm_dqrele(gdqp);
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xfs_qm_dqrele(pdqp);
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*ipp = ip;
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return 0;
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error2:
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IRELE(ip);
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error1:
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xfs_bmap_cancel(&free_list);
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cancel_flags |= XFS_TRANS_ABORT;
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error_return:
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xfs_trans_cancel(tp, cancel_flags);
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xfs_qm_dqrele(udqp);
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xfs_qm_dqrele(gdqp);
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xfs_qm_dqrele(pdqp);
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if (unlock_dp_on_error)
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xfs_iunlock(dp, XFS_ILOCK_EXCL);
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std_return:
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return error;
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}
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/*
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* Free a symlink that has blocks associated with it.
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*/
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STATIC int
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xfs_inactive_symlink_rmt(
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struct xfs_inode *ip)
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{
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xfs_buf_t *bp;
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int committed;
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int done;
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int error;
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xfs_fsblock_t first_block;
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xfs_bmap_free_t free_list;
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int i;
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xfs_mount_t *mp;
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xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
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int nmaps;
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int size;
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xfs_trans_t *tp;
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mp = ip->i_mount;
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ASSERT(ip->i_df.if_flags & XFS_IFEXTENTS);
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/*
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* We're freeing a symlink that has some
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* blocks allocated to it. Free the
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* blocks here. We know that we've got
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* either 1 or 2 extents and that we can
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* free them all in one bunmapi call.
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*/
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ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
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tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
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error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
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if (error) {
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xfs_trans_cancel(tp, 0);
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return error;
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}
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, 0);
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/*
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* Lock the inode, fix the size, and join it to the transaction.
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* Hold it so in the normal path, we still have it locked for
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* the second transaction. In the error paths we need it
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* held so the cancel won't rele it, see below.
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*/
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size = (int)ip->i_d.di_size;
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ip->i_d.di_size = 0;
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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/*
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* Find the block(s) so we can inval and unmap them.
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*/
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done = 0;
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xfs_bmap_init(&free_list, &first_block);
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nmaps = ARRAY_SIZE(mval);
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error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
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mval, &nmaps, 0);
|
|
if (error)
|
|
goto error_trans_cancel;
|
|
/*
|
|
* Invalidate the block(s). No validation is done.
|
|
*/
|
|
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 error_bmap_cancel;
|
|
}
|
|
xfs_trans_binval(tp, bp);
|
|
}
|
|
/*
|
|
* Unmap the dead block(s) to the free_list.
|
|
*/
|
|
error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
|
|
&first_block, &free_list, &done);
|
|
if (error)
|
|
goto error_bmap_cancel;
|
|
ASSERT(done);
|
|
/*
|
|
* Commit the first transaction. This logs the EFI and the inode.
|
|
*/
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto error_bmap_cancel;
|
|
/*
|
|
* 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);
|
|
/*
|
|
* Commit the transaction containing extent freeing and EFDs.
|
|
*/
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error) {
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
goto error_unlock;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return 0;
|
|
|
|
error_bmap_cancel:
|
|
xfs_bmap_cancel(&free_list);
|
|
error_trans_cancel:
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
error_unlock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* xfs_inactive_symlink - free a symlink
|
|
*/
|
|
int
|
|
xfs_inactive_symlink(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int pathlen;
|
|
|
|
trace_xfs_inactive_symlink(ip);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* Zero length symlinks _can_ exist.
|
|
*/
|
|
pathlen = (int)ip->i_d.di_size;
|
|
if (!pathlen) {
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
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);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
ASSERT(0);
|
|
return -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);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
ASSERT(ip->i_df.if_bytes == 0);
|
|
return 0;
|
|
}
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
|
|
/* remove the remote symlink */
|
|
return xfs_inactive_symlink_rmt(ip);
|
|
}
|