![Christoph Hellwig](/assets/img/avatar_default.png)
Micro-optimize various comparisms by always byteswapping the constant instead of the variable, which allows to do the swap at compile instead of runtime. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Alex Elder <aelder@sgi.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2242 lines
56 KiB
C
2242 lines
56 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, 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_inum.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_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_attr_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_alloc.h"
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#include "xfs_inode_item.h"
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#include "xfs_bmap.h"
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#include "xfs_attr.h"
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#include "xfs_attr_leaf.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_rw.h"
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#include "xfs_vnodeops.h"
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#include "xfs_trace.h"
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/*
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* xfs_attr.c
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*
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* Provide the external interfaces to manage attribute lists.
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*/
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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/*
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* Internal routines when attribute list fits inside the inode.
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*/
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STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
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/*
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* Internal routines when attribute list is one block.
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*/
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STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
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STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
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STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
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STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
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/*
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* Internal routines when attribute list is more than one block.
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*/
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STATIC int xfs_attr_node_get(xfs_da_args_t *args);
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STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
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STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
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STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
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STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
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STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
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/*
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* Routines to manipulate out-of-line attribute values.
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*/
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STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
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STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
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#define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
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STATIC int
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xfs_attr_name_to_xname(
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struct xfs_name *xname,
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const unsigned char *aname)
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{
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if (!aname)
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return EINVAL;
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xname->name = aname;
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xname->len = strlen((char *)aname);
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if (xname->len >= MAXNAMELEN)
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return EFAULT; /* match IRIX behaviour */
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return 0;
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}
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STATIC int
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xfs_inode_hasattr(
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struct xfs_inode *ip)
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{
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if (!XFS_IFORK_Q(ip) ||
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(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
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ip->i_d.di_anextents == 0))
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return 0;
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return 1;
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}
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/*========================================================================
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* Overall external interface routines.
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*========================================================================*/
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STATIC int
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xfs_attr_get_int(
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struct xfs_inode *ip,
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struct xfs_name *name,
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unsigned char *value,
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int *valuelenp,
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int flags)
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{
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xfs_da_args_t args;
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int error;
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if (!xfs_inode_hasattr(ip))
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return ENOATTR;
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/*
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* Fill in the arg structure for this request.
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*/
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memset((char *)&args, 0, sizeof(args));
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args.name = name->name;
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args.namelen = name->len;
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args.value = value;
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args.valuelen = *valuelenp;
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args.flags = flags;
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args.hashval = xfs_da_hashname(args.name, args.namelen);
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args.dp = ip;
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args.whichfork = XFS_ATTR_FORK;
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/*
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* Decide on what work routines to call based on the inode size.
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*/
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if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
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error = xfs_attr_shortform_getvalue(&args);
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} else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
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error = xfs_attr_leaf_get(&args);
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} else {
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error = xfs_attr_node_get(&args);
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}
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/*
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* Return the number of bytes in the value to the caller.
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*/
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*valuelenp = args.valuelen;
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if (error == EEXIST)
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error = 0;
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return(error);
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}
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int
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xfs_attr_get(
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xfs_inode_t *ip,
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const unsigned char *name,
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unsigned char *value,
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int *valuelenp,
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int flags)
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{
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int error;
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struct xfs_name xname;
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XFS_STATS_INC(xs_attr_get);
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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return(EIO);
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error = xfs_attr_name_to_xname(&xname, name);
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if (error)
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return error;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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return(error);
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}
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/*
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* Calculate how many blocks we need for the new attribute,
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*/
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STATIC int
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xfs_attr_calc_size(
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struct xfs_inode *ip,
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int namelen,
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int valuelen,
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int *local)
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{
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struct xfs_mount *mp = ip->i_mount;
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int size;
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int nblks;
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/*
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* Determine space new attribute will use, and if it would be
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* "local" or "remote" (note: local != inline).
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*/
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size = xfs_attr_leaf_newentsize(namelen, valuelen,
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mp->m_sb.sb_blocksize, local);
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nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
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if (*local) {
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if (size > (mp->m_sb.sb_blocksize >> 1)) {
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/* Double split possible */
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nblks *= 2;
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}
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} else {
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/*
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* Out of line attribute, cannot double split, but
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* make room for the attribute value itself.
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*/
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uint dblocks = XFS_B_TO_FSB(mp, valuelen);
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nblks += dblocks;
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nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
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}
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return nblks;
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}
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STATIC int
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xfs_attr_set_int(
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struct xfs_inode *dp,
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struct xfs_name *name,
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unsigned char *value,
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int valuelen,
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int flags)
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{
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xfs_da_args_t args;
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xfs_fsblock_t firstblock;
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xfs_bmap_free_t flist;
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int error, err2, committed;
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xfs_mount_t *mp = dp->i_mount;
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int rsvd = (flags & ATTR_ROOT) != 0;
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int local;
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/*
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* Attach the dquots to the inode.
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*/
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error = xfs_qm_dqattach(dp, 0);
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if (error)
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return error;
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/*
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* If the inode doesn't have an attribute fork, add one.
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* (inode must not be locked when we call this routine)
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*/
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if (XFS_IFORK_Q(dp) == 0) {
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int sf_size = sizeof(xfs_attr_sf_hdr_t) +
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XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen);
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if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
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return(error);
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}
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/*
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* Fill in the arg structure for this request.
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*/
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memset((char *)&args, 0, sizeof(args));
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args.name = name->name;
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args.namelen = name->len;
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args.value = value;
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args.valuelen = valuelen;
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args.flags = flags;
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args.hashval = xfs_da_hashname(args.name, args.namelen);
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args.dp = dp;
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args.firstblock = &firstblock;
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args.flist = &flist;
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args.whichfork = XFS_ATTR_FORK;
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args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
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/* Size is now blocks for attribute data */
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args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
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/*
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* Start our first transaction of the day.
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*
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* All future transactions during this code must be "chained" off
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* this one via the trans_dup() call. All transactions will contain
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* the inode, and the inode will always be marked with trans_ihold().
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* Since the inode will be locked in all transactions, we must log
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* the inode in every transaction to let it float upward through
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* the log.
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*/
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args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
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/*
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* Root fork attributes can use reserved data blocks for this
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* operation if necessary
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*/
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if (rsvd)
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args.trans->t_flags |= XFS_TRANS_RESERVE;
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if ((error = xfs_trans_reserve(args.trans, args.total,
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XFS_ATTRSET_LOG_RES(mp, args.total), 0,
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XFS_TRANS_PERM_LOG_RES, XFS_ATTRSET_LOG_COUNT))) {
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xfs_trans_cancel(args.trans, 0);
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return(error);
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}
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xfs_ilock(dp, XFS_ILOCK_EXCL);
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error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
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rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
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XFS_QMOPT_RES_REGBLKS);
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if (error) {
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xfs_iunlock(dp, XFS_ILOCK_EXCL);
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xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
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return (error);
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}
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xfs_trans_ijoin(args.trans, dp);
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/*
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* If the attribute list is non-existent or a shortform list,
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* upgrade it to a single-leaf-block attribute list.
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*/
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if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
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((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
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(dp->i_d.di_anextents == 0))) {
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/*
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* Build initial attribute list (if required).
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*/
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if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
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xfs_attr_shortform_create(&args);
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/*
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* Try to add the attr to the attribute list in
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* the inode.
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*/
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error = xfs_attr_shortform_addname(&args);
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if (error != ENOSPC) {
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/*
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* Commit the shortform mods, and we're done.
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* NOTE: this is also the error path (EEXIST, etc).
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*/
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ASSERT(args.trans != NULL);
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/*
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* If this is a synchronous mount, make sure that
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* the transaction goes to disk before returning
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* to the user.
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*/
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if (mp->m_flags & XFS_MOUNT_WSYNC) {
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xfs_trans_set_sync(args.trans);
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}
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if (!error && (flags & ATTR_KERNOTIME) == 0) {
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xfs_trans_ichgtime(args.trans, dp,
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XFS_ICHGTIME_CHG);
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}
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err2 = xfs_trans_commit(args.trans,
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XFS_TRANS_RELEASE_LOG_RES);
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xfs_iunlock(dp, XFS_ILOCK_EXCL);
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return(error == 0 ? err2 : error);
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}
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/*
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* It won't fit in the shortform, transform to a leaf block.
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* GROT: another possible req'mt for a double-split btree op.
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*/
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xfs_bmap_init(args.flist, args.firstblock);
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error = xfs_attr_shortform_to_leaf(&args);
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if (!error) {
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error = xfs_bmap_finish(&args.trans, args.flist,
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&committed);
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}
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if (error) {
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ASSERT(committed);
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args.trans = NULL;
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xfs_bmap_cancel(&flist);
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goto out;
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}
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/*
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* bmap_finish() may have committed the last trans and started
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* a new one. We need the inode to be in all transactions.
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*/
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if (committed)
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xfs_trans_ijoin(args.trans, dp);
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/*
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* Commit the leaf transformation. We'll need another (linked)
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* transaction to add the new attribute to the leaf.
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*/
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error = xfs_trans_roll(&args.trans, dp);
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if (error)
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goto out;
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}
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if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
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error = xfs_attr_leaf_addname(&args);
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} else {
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error = xfs_attr_node_addname(&args);
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}
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if (error) {
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goto out;
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}
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/*
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* If this is a synchronous mount, make sure that the
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* transaction goes to disk before returning to the user.
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*/
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if (mp->m_flags & XFS_MOUNT_WSYNC) {
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xfs_trans_set_sync(args.trans);
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}
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if ((flags & ATTR_KERNOTIME) == 0)
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xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
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/*
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* Commit the last in the sequence of transactions.
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*/
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xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
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error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
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xfs_iunlock(dp, XFS_ILOCK_EXCL);
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return(error);
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out:
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if (args.trans)
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xfs_trans_cancel(args.trans,
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XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
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xfs_iunlock(dp, XFS_ILOCK_EXCL);
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return(error);
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}
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|
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int
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xfs_attr_set(
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xfs_inode_t *dp,
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const unsigned char *name,
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unsigned char *value,
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int valuelen,
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int flags)
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{
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int error;
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struct xfs_name xname;
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|
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XFS_STATS_INC(xs_attr_set);
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if (XFS_FORCED_SHUTDOWN(dp->i_mount))
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return (EIO);
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error = xfs_attr_name_to_xname(&xname, name);
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if (error)
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return error;
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return xfs_attr_set_int(dp, &xname, value, valuelen, flags);
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}
|
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|
|
/*
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* Generic handler routine to remove a name from an attribute list.
|
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* Transitions attribute list from Btree to shortform as necessary.
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|
*/
|
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STATIC int
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xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
|
|
{
|
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xfs_da_args_t args;
|
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xfs_fsblock_t firstblock;
|
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xfs_bmap_free_t flist;
|
|
int error;
|
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xfs_mount_t *mp = dp->i_mount;
|
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|
|
/*
|
|
* Fill in the arg structure for this request.
|
|
*/
|
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memset((char *)&args, 0, sizeof(args));
|
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args.name = name->name;
|
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args.namelen = name->len;
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args.flags = flags;
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args.hashval = xfs_da_hashname(args.name, args.namelen);
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args.dp = dp;
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args.firstblock = &firstblock;
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args.flist = &flist;
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args.total = 0;
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args.whichfork = XFS_ATTR_FORK;
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|
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/*
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* we have no control over the attribute names that userspace passes us
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* to remove, so we have to allow the name lookup prior to attribute
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* removal to fail.
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*/
|
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args.op_flags = XFS_DA_OP_OKNOENT;
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|
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/*
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|
* Attach the dquots to the inode.
|
|
*/
|
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error = xfs_qm_dqattach(dp, 0);
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|
if (error)
|
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return error;
|
|
|
|
/*
|
|
* Start our first transaction of the day.
|
|
*
|
|
* All future transactions during this code must be "chained" off
|
|
* this one via the trans_dup() call. All transactions will contain
|
|
* the inode, and the inode will always be marked with trans_ihold().
|
|
* Since the inode will be locked in all transactions, we must log
|
|
* the inode in every transaction to let it float upward through
|
|
* the log.
|
|
*/
|
|
args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
|
|
|
|
/*
|
|
* Root fork attributes can use reserved data blocks for this
|
|
* operation if necessary
|
|
*/
|
|
|
|
if (flags & ATTR_ROOT)
|
|
args.trans->t_flags |= XFS_TRANS_RESERVE;
|
|
|
|
if ((error = xfs_trans_reserve(args.trans,
|
|
XFS_ATTRRM_SPACE_RES(mp),
|
|
XFS_ATTRRM_LOG_RES(mp),
|
|
0, XFS_TRANS_PERM_LOG_RES,
|
|
XFS_ATTRRM_LOG_COUNT))) {
|
|
xfs_trans_cancel(args.trans, 0);
|
|
return(error);
|
|
}
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_EXCL);
|
|
/*
|
|
* No need to make quota reservations here. We expect to release some
|
|
* blocks not allocate in the common case.
|
|
*/
|
|
xfs_trans_ijoin(args.trans, dp);
|
|
|
|
/*
|
|
* Decide on what work routines to call based on the inode size.
|
|
*/
|
|
if (!xfs_inode_hasattr(dp)) {
|
|
error = XFS_ERROR(ENOATTR);
|
|
goto out;
|
|
}
|
|
if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
|
|
ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
|
|
error = xfs_attr_shortform_remove(&args);
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
|
|
error = xfs_attr_leaf_removename(&args);
|
|
} else {
|
|
error = xfs_attr_node_removename(&args);
|
|
}
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* transaction goes to disk before returning to the user.
|
|
*/
|
|
if (mp->m_flags & XFS_MOUNT_WSYNC) {
|
|
xfs_trans_set_sync(args.trans);
|
|
}
|
|
|
|
if ((flags & ATTR_KERNOTIME) == 0)
|
|
xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
|
|
|
|
/*
|
|
* Commit the last in the sequence of transactions.
|
|
*/
|
|
xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
|
|
error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
|
|
return(error);
|
|
|
|
out:
|
|
if (args.trans)
|
|
xfs_trans_cancel(args.trans,
|
|
XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
return(error);
|
|
}
|
|
|
|
int
|
|
xfs_attr_remove(
|
|
xfs_inode_t *dp,
|
|
const unsigned char *name,
|
|
int flags)
|
|
{
|
|
int error;
|
|
struct xfs_name xname;
|
|
|
|
XFS_STATS_INC(xs_attr_remove);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
|
|
return (EIO);
|
|
|
|
error = xfs_attr_name_to_xname(&xname, name);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_SHARED);
|
|
if (!xfs_inode_hasattr(dp)) {
|
|
xfs_iunlock(dp, XFS_ILOCK_SHARED);
|
|
return XFS_ERROR(ENOATTR);
|
|
}
|
|
xfs_iunlock(dp, XFS_ILOCK_SHARED);
|
|
|
|
return xfs_attr_remove_int(dp, &xname, flags);
|
|
}
|
|
|
|
int
|
|
xfs_attr_list_int(xfs_attr_list_context_t *context)
|
|
{
|
|
int error;
|
|
xfs_inode_t *dp = context->dp;
|
|
|
|
XFS_STATS_INC(xs_attr_list);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
|
|
return EIO;
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_SHARED);
|
|
|
|
/*
|
|
* Decide on what work routines to call based on the inode size.
|
|
*/
|
|
if (!xfs_inode_hasattr(dp)) {
|
|
error = 0;
|
|
} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
|
|
error = xfs_attr_shortform_list(context);
|
|
} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
|
|
error = xfs_attr_leaf_list(context);
|
|
} else {
|
|
error = xfs_attr_node_list(context);
|
|
}
|
|
|
|
xfs_iunlock(dp, XFS_ILOCK_SHARED);
|
|
|
|
return error;
|
|
}
|
|
|
|
#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
|
|
(((struct attrlist_ent *) 0)->a_name - (char *) 0)
|
|
#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
|
|
((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
|
|
& ~(sizeof(u_int32_t)-1))
|
|
|
|
/*
|
|
* Format an attribute and copy it out to the user's buffer.
|
|
* Take care to check values and protect against them changing later,
|
|
* we may be reading them directly out of a user buffer.
|
|
*/
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
xfs_attr_put_listent(
|
|
xfs_attr_list_context_t *context,
|
|
int flags,
|
|
unsigned char *name,
|
|
int namelen,
|
|
int valuelen,
|
|
unsigned char *value)
|
|
{
|
|
struct attrlist *alist = (struct attrlist *)context->alist;
|
|
attrlist_ent_t *aep;
|
|
int arraytop;
|
|
|
|
ASSERT(!(context->flags & ATTR_KERNOVAL));
|
|
ASSERT(context->count >= 0);
|
|
ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
|
|
ASSERT(context->firstu >= sizeof(*alist));
|
|
ASSERT(context->firstu <= context->bufsize);
|
|
|
|
/*
|
|
* Only list entries in the right namespace.
|
|
*/
|
|
if (((context->flags & ATTR_SECURE) == 0) !=
|
|
((flags & XFS_ATTR_SECURE) == 0))
|
|
return 0;
|
|
if (((context->flags & ATTR_ROOT) == 0) !=
|
|
((flags & XFS_ATTR_ROOT) == 0))
|
|
return 0;
|
|
|
|
arraytop = sizeof(*alist) +
|
|
context->count * sizeof(alist->al_offset[0]);
|
|
context->firstu -= ATTR_ENTSIZE(namelen);
|
|
if (context->firstu < arraytop) {
|
|
trace_xfs_attr_list_full(context);
|
|
alist->al_more = 1;
|
|
context->seen_enough = 1;
|
|
return 1;
|
|
}
|
|
|
|
aep = (attrlist_ent_t *)&context->alist[context->firstu];
|
|
aep->a_valuelen = valuelen;
|
|
memcpy(aep->a_name, name, namelen);
|
|
aep->a_name[namelen] = 0;
|
|
alist->al_offset[context->count++] = context->firstu;
|
|
alist->al_count = context->count;
|
|
trace_xfs_attr_list_add(context);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Generate a list of extended attribute names and optionally
|
|
* also value lengths. Positive return value follows the XFS
|
|
* convention of being an error, zero or negative return code
|
|
* is the length of the buffer returned (negated), indicating
|
|
* success.
|
|
*/
|
|
int
|
|
xfs_attr_list(
|
|
xfs_inode_t *dp,
|
|
char *buffer,
|
|
int bufsize,
|
|
int flags,
|
|
attrlist_cursor_kern_t *cursor)
|
|
{
|
|
xfs_attr_list_context_t context;
|
|
struct attrlist *alist;
|
|
int error;
|
|
|
|
/*
|
|
* Validate the cursor.
|
|
*/
|
|
if (cursor->pad1 || cursor->pad2)
|
|
return(XFS_ERROR(EINVAL));
|
|
if ((cursor->initted == 0) &&
|
|
(cursor->hashval || cursor->blkno || cursor->offset))
|
|
return XFS_ERROR(EINVAL);
|
|
|
|
/*
|
|
* Check for a properly aligned buffer.
|
|
*/
|
|
if (((long)buffer) & (sizeof(int)-1))
|
|
return XFS_ERROR(EFAULT);
|
|
if (flags & ATTR_KERNOVAL)
|
|
bufsize = 0;
|
|
|
|
/*
|
|
* Initialize the output buffer.
|
|
*/
|
|
memset(&context, 0, sizeof(context));
|
|
context.dp = dp;
|
|
context.cursor = cursor;
|
|
context.resynch = 1;
|
|
context.flags = flags;
|
|
context.alist = buffer;
|
|
context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
|
|
context.firstu = context.bufsize;
|
|
context.put_listent = xfs_attr_put_listent;
|
|
|
|
alist = (struct attrlist *)context.alist;
|
|
alist->al_count = 0;
|
|
alist->al_more = 0;
|
|
alist->al_offset[0] = context.bufsize;
|
|
|
|
error = xfs_attr_list_int(&context);
|
|
ASSERT(error >= 0);
|
|
return error;
|
|
}
|
|
|
|
int /* error */
|
|
xfs_attr_inactive(xfs_inode_t *dp)
|
|
{
|
|
xfs_trans_t *trans;
|
|
xfs_mount_t *mp;
|
|
int error;
|
|
|
|
mp = dp->i_mount;
|
|
ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_SHARED);
|
|
if (!xfs_inode_hasattr(dp) ||
|
|
dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
|
|
xfs_iunlock(dp, XFS_ILOCK_SHARED);
|
|
return 0;
|
|
}
|
|
xfs_iunlock(dp, XFS_ILOCK_SHARED);
|
|
|
|
/*
|
|
* Start our first transaction of the day.
|
|
*
|
|
* All future transactions during this code must be "chained" off
|
|
* this one via the trans_dup() call. All transactions will contain
|
|
* the inode, and the inode will always be marked with trans_ihold().
|
|
* Since the inode will be locked in all transactions, we must log
|
|
* the inode in every transaction to let it float upward through
|
|
* the log.
|
|
*/
|
|
trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
|
|
if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_ATTRINVAL_LOG_COUNT))) {
|
|
xfs_trans_cancel(trans, 0);
|
|
return(error);
|
|
}
|
|
xfs_ilock(dp, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* No need to make quota reservations here. We expect to release some
|
|
* blocks, not allocate, in the common case.
|
|
*/
|
|
xfs_trans_ijoin(trans, dp);
|
|
|
|
/*
|
|
* Decide on what work routines to call based on the inode size.
|
|
*/
|
|
if (!xfs_inode_hasattr(dp) ||
|
|
dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
error = xfs_attr_root_inactive(&trans, dp);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Signal synchronous inactive transactions unless this is a
|
|
* synchronous mount filesystem in which case we know that we're here
|
|
* because we've been called out of xfs_inactive which means that the
|
|
* last reference is gone and the unlink transaction has already hit
|
|
* the disk so async inactive transactions are safe.
|
|
*/
|
|
if (!(mp->m_flags & XFS_MOUNT_WSYNC)) {
|
|
if (dp->i_d.di_anextents > 0)
|
|
xfs_trans_set_sync(trans);
|
|
}
|
|
|
|
error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Commit the last in the sequence of transactions.
|
|
*/
|
|
xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
|
|
error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
|
|
return(error);
|
|
|
|
out:
|
|
xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
return(error);
|
|
}
|
|
|
|
|
|
|
|
/*========================================================================
|
|
* External routines when attribute list is inside the inode
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Add a name to the shortform attribute list structure
|
|
* This is the external routine.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_shortform_addname(xfs_da_args_t *args)
|
|
{
|
|
int newsize, forkoff, retval;
|
|
|
|
retval = xfs_attr_shortform_lookup(args);
|
|
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
|
|
return(retval);
|
|
} else if (retval == EEXIST) {
|
|
if (args->flags & ATTR_CREATE)
|
|
return(retval);
|
|
retval = xfs_attr_shortform_remove(args);
|
|
ASSERT(retval == 0);
|
|
}
|
|
|
|
if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
|
|
args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
|
|
return(XFS_ERROR(ENOSPC));
|
|
|
|
newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
|
|
newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
|
|
|
|
forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
|
|
if (!forkoff)
|
|
return(XFS_ERROR(ENOSPC));
|
|
|
|
xfs_attr_shortform_add(args, forkoff);
|
|
return(0);
|
|
}
|
|
|
|
|
|
/*========================================================================
|
|
* External routines when attribute list is one block
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Add a name to the leaf attribute list structure
|
|
*
|
|
* This leaf block cannot have a "remote" value, we only call this routine
|
|
* if bmap_one_block() says there is only one block (ie: no remote blks).
|
|
*/
|
|
STATIC int
|
|
xfs_attr_leaf_addname(xfs_da_args_t *args)
|
|
{
|
|
xfs_inode_t *dp;
|
|
xfs_dabuf_t *bp;
|
|
int retval, error, committed, forkoff;
|
|
|
|
/*
|
|
* Read the (only) block in the attribute list in.
|
|
*/
|
|
dp = args->dp;
|
|
args->blkno = 0;
|
|
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
|
|
XFS_ATTR_FORK);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
|
|
/*
|
|
* Look up the given attribute in the leaf block. Figure out if
|
|
* the given flags produce an error or call for an atomic rename.
|
|
*/
|
|
retval = xfs_attr_leaf_lookup_int(bp, args);
|
|
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
|
|
xfs_da_brelse(args->trans, bp);
|
|
return(retval);
|
|
} else if (retval == EEXIST) {
|
|
if (args->flags & ATTR_CREATE) { /* pure create op */
|
|
xfs_da_brelse(args->trans, bp);
|
|
return(retval);
|
|
}
|
|
args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
|
|
args->blkno2 = args->blkno; /* set 2nd entry info*/
|
|
args->index2 = args->index;
|
|
args->rmtblkno2 = args->rmtblkno;
|
|
args->rmtblkcnt2 = args->rmtblkcnt;
|
|
}
|
|
|
|
/*
|
|
* Add the attribute to the leaf block, transitioning to a Btree
|
|
* if required.
|
|
*/
|
|
retval = xfs_attr_leaf_add(bp, args);
|
|
xfs_da_buf_done(bp);
|
|
if (retval == ENOSPC) {
|
|
/*
|
|
* Promote the attribute list to the Btree format, then
|
|
* Commit that transaction so that the node_addname() call
|
|
* can manage its own transactions.
|
|
*/
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_attr_leaf_to_node(args);
|
|
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);
|
|
|
|
/*
|
|
* Commit the current trans (including the inode) and start
|
|
* a new one.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, dp);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Fob the whole rest of the problem off on the Btree code.
|
|
*/
|
|
error = xfs_attr_node_addname(args);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Commit the transaction that added the attr name so that
|
|
* later routines can manage their own transactions.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, dp);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* If there was an out-of-line value, allocate the blocks we
|
|
* identified for its storage and copy the value. This is done
|
|
* after we create the attribute so that we don't overflow the
|
|
* maximum size of a transaction and/or hit a deadlock.
|
|
*/
|
|
if (args->rmtblkno > 0) {
|
|
error = xfs_attr_rmtval_set(args);
|
|
if (error)
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* If this is an atomic rename operation, we must "flip" the
|
|
* incomplete flags on the "new" and "old" attribute/value pairs
|
|
* so that one disappears and one appears atomically. Then we
|
|
* must remove the "old" attribute/value pair.
|
|
*/
|
|
if (args->op_flags & XFS_DA_OP_RENAME) {
|
|
/*
|
|
* In a separate transaction, set the incomplete flag on the
|
|
* "old" attr and clear the incomplete flag on the "new" attr.
|
|
*/
|
|
error = xfs_attr_leaf_flipflags(args);
|
|
if (error)
|
|
return(error);
|
|
|
|
/*
|
|
* Dismantle the "old" attribute/value pair by removing
|
|
* a "remote" value (if it exists).
|
|
*/
|
|
args->index = args->index2;
|
|
args->blkno = args->blkno2;
|
|
args->rmtblkno = args->rmtblkno2;
|
|
args->rmtblkcnt = args->rmtblkcnt2;
|
|
if (args->rmtblkno) {
|
|
error = xfs_attr_rmtval_remove(args);
|
|
if (error)
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Read in the block containing the "old" attr, then
|
|
* remove the "old" attr from that block (neat, huh!)
|
|
*/
|
|
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
|
|
&bp, XFS_ATTR_FORK);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
(void)xfs_attr_leaf_remove(bp, args);
|
|
|
|
/*
|
|
* If the result is small enough, shrink it all into the inode.
|
|
*/
|
|
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
|
|
/* bp is gone due to xfs_da_shrink_inode */
|
|
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);
|
|
} else
|
|
xfs_da_buf_done(bp);
|
|
|
|
/*
|
|
* Commit the remove and start the next trans in series.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, dp);
|
|
|
|
} else if (args->rmtblkno > 0) {
|
|
/*
|
|
* Added a "remote" value, just clear the incomplete flag.
|
|
*/
|
|
error = xfs_attr_leaf_clearflag(args);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Remove a name from the leaf attribute list structure
|
|
*
|
|
* This leaf block cannot have a "remote" value, we only call this routine
|
|
* if bmap_one_block() says there is only one block (ie: no remote blks).
|
|
*/
|
|
STATIC int
|
|
xfs_attr_leaf_removename(xfs_da_args_t *args)
|
|
{
|
|
xfs_inode_t *dp;
|
|
xfs_dabuf_t *bp;
|
|
int error, committed, forkoff;
|
|
|
|
/*
|
|
* Remove the attribute.
|
|
*/
|
|
dp = args->dp;
|
|
args->blkno = 0;
|
|
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
|
|
XFS_ATTR_FORK);
|
|
if (error) {
|
|
return(error);
|
|
}
|
|
|
|
ASSERT(bp != NULL);
|
|
error = xfs_attr_leaf_lookup_int(bp, args);
|
|
if (error == ENOATTR) {
|
|
xfs_da_brelse(args->trans, bp);
|
|
return(error);
|
|
}
|
|
|
|
(void)xfs_attr_leaf_remove(bp, args);
|
|
|
|
/*
|
|
* If the result is small enough, shrink it all into the inode.
|
|
*/
|
|
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
|
|
/* bp is gone due to xfs_da_shrink_inode */
|
|
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);
|
|
} else
|
|
xfs_da_buf_done(bp);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Look up a name in a leaf attribute list structure.
|
|
*
|
|
* This leaf block cannot have a "remote" value, we only call this routine
|
|
* if bmap_one_block() says there is only one block (ie: no remote blks).
|
|
*/
|
|
STATIC int
|
|
xfs_attr_leaf_get(xfs_da_args_t *args)
|
|
{
|
|
xfs_dabuf_t *bp;
|
|
int error;
|
|
|
|
args->blkno = 0;
|
|
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
|
|
XFS_ATTR_FORK);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
|
|
error = xfs_attr_leaf_lookup_int(bp, args);
|
|
if (error != EEXIST) {
|
|
xfs_da_brelse(args->trans, bp);
|
|
return(error);
|
|
}
|
|
error = xfs_attr_leaf_getvalue(bp, args);
|
|
xfs_da_brelse(args->trans, bp);
|
|
if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
|
|
error = xfs_attr_rmtval_get(args);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Copy out attribute entries for attr_list(), for leaf attribute lists.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_leaf_list(xfs_attr_list_context_t *context)
|
|
{
|
|
xfs_attr_leafblock_t *leaf;
|
|
int error;
|
|
xfs_dabuf_t *bp;
|
|
|
|
context->cursor->blkno = 0;
|
|
error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
|
|
if (error)
|
|
return XFS_ERROR(error);
|
|
ASSERT(bp != NULL);
|
|
leaf = bp->data;
|
|
if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
|
|
XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
|
|
context->dp->i_mount, leaf);
|
|
xfs_da_brelse(NULL, bp);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
error = xfs_attr_leaf_list_int(bp, context);
|
|
xfs_da_brelse(NULL, bp);
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
|
|
/*========================================================================
|
|
* External routines when attribute list size > XFS_LBSIZE(mp).
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Add a name to a Btree-format attribute list.
|
|
*
|
|
* This will involve walking down the Btree, and may involve splitting
|
|
* leaf nodes and even splitting intermediate nodes up to and including
|
|
* the root node (a special case of an intermediate node).
|
|
*
|
|
* "Remote" attribute values confuse the issue and atomic rename operations
|
|
* add a whole extra layer of confusion on top of that.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_node_addname(xfs_da_args_t *args)
|
|
{
|
|
xfs_da_state_t *state;
|
|
xfs_da_state_blk_t *blk;
|
|
xfs_inode_t *dp;
|
|
xfs_mount_t *mp;
|
|
int committed, retval, error;
|
|
|
|
/*
|
|
* Fill in bucket of arguments/results/context to carry around.
|
|
*/
|
|
dp = args->dp;
|
|
mp = dp->i_mount;
|
|
restart:
|
|
state = xfs_da_state_alloc();
|
|
state->args = args;
|
|
state->mp = mp;
|
|
state->blocksize = state->mp->m_sb.sb_blocksize;
|
|
state->node_ents = state->mp->m_attr_node_ents;
|
|
|
|
/*
|
|
* Search to see if name already exists, and get back a pointer
|
|
* to where it should go.
|
|
*/
|
|
error = xfs_da_node_lookup_int(state, &retval);
|
|
if (error)
|
|
goto out;
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
|
|
goto out;
|
|
} else if (retval == EEXIST) {
|
|
if (args->flags & ATTR_CREATE)
|
|
goto out;
|
|
args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
|
|
args->blkno2 = args->blkno; /* set 2nd entry info*/
|
|
args->index2 = args->index;
|
|
args->rmtblkno2 = args->rmtblkno;
|
|
args->rmtblkcnt2 = args->rmtblkcnt;
|
|
args->rmtblkno = 0;
|
|
args->rmtblkcnt = 0;
|
|
}
|
|
|
|
retval = xfs_attr_leaf_add(blk->bp, state->args);
|
|
if (retval == ENOSPC) {
|
|
if (state->path.active == 1) {
|
|
/*
|
|
* Its really a single leaf node, but it had
|
|
* out-of-line values so it looked like it *might*
|
|
* have been a b-tree.
|
|
*/
|
|
xfs_da_state_free(state);
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_attr_leaf_to_node(args);
|
|
if (!error) {
|
|
error = xfs_bmap_finish(&args->trans,
|
|
args->flist,
|
|
&committed);
|
|
}
|
|
if (error) {
|
|
ASSERT(committed);
|
|
args->trans = NULL;
|
|
xfs_bmap_cancel(args->flist);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* Commit the node conversion and start the next
|
|
* trans in the chain.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, dp);
|
|
if (error)
|
|
goto out;
|
|
|
|
goto restart;
|
|
}
|
|
|
|
/*
|
|
* Split as many Btree elements as required.
|
|
* This code tracks the new and old attr's location
|
|
* in the index/blkno/rmtblkno/rmtblkcnt fields and
|
|
* in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
|
|
*/
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_da_split(state);
|
|
if (!error) {
|
|
error = xfs_bmap_finish(&args->trans, args->flist,
|
|
&committed);
|
|
}
|
|
if (error) {
|
|
ASSERT(committed);
|
|
args->trans = NULL;
|
|
xfs_bmap_cancel(args->flist);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
} else {
|
|
/*
|
|
* Addition succeeded, update Btree hashvals.
|
|
*/
|
|
xfs_da_fixhashpath(state, &state->path);
|
|
}
|
|
|
|
/*
|
|
* Kill the state structure, we're done with it and need to
|
|
* allow the buffers to come back later.
|
|
*/
|
|
xfs_da_state_free(state);
|
|
state = NULL;
|
|
|
|
/*
|
|
* Commit the leaf addition or btree split and start the next
|
|
* trans in the chain.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, dp);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* If there was an out-of-line value, allocate the blocks we
|
|
* identified for its storage and copy the value. This is done
|
|
* after we create the attribute so that we don't overflow the
|
|
* maximum size of a transaction and/or hit a deadlock.
|
|
*/
|
|
if (args->rmtblkno > 0) {
|
|
error = xfs_attr_rmtval_set(args);
|
|
if (error)
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* If this is an atomic rename operation, we must "flip" the
|
|
* incomplete flags on the "new" and "old" attribute/value pairs
|
|
* so that one disappears and one appears atomically. Then we
|
|
* must remove the "old" attribute/value pair.
|
|
*/
|
|
if (args->op_flags & XFS_DA_OP_RENAME) {
|
|
/*
|
|
* In a separate transaction, set the incomplete flag on the
|
|
* "old" attr and clear the incomplete flag on the "new" attr.
|
|
*/
|
|
error = xfs_attr_leaf_flipflags(args);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Dismantle the "old" attribute/value pair by removing
|
|
* a "remote" value (if it exists).
|
|
*/
|
|
args->index = args->index2;
|
|
args->blkno = args->blkno2;
|
|
args->rmtblkno = args->rmtblkno2;
|
|
args->rmtblkcnt = args->rmtblkcnt2;
|
|
if (args->rmtblkno) {
|
|
error = xfs_attr_rmtval_remove(args);
|
|
if (error)
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Re-find the "old" attribute entry after any split ops.
|
|
* The INCOMPLETE flag means that we will find the "old"
|
|
* attr, not the "new" one.
|
|
*/
|
|
args->flags |= XFS_ATTR_INCOMPLETE;
|
|
state = xfs_da_state_alloc();
|
|
state->args = args;
|
|
state->mp = mp;
|
|
state->blocksize = state->mp->m_sb.sb_blocksize;
|
|
state->node_ents = state->mp->m_attr_node_ents;
|
|
state->inleaf = 0;
|
|
error = xfs_da_node_lookup_int(state, &retval);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Remove the name and update the hashvals in the tree.
|
|
*/
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
error = xfs_attr_leaf_remove(blk->bp, args);
|
|
xfs_da_fixhashpath(state, &state->path);
|
|
|
|
/*
|
|
* Check to see if the tree needs to be collapsed.
|
|
*/
|
|
if (retval && (state->path.active > 1)) {
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_da_join(state);
|
|
if (!error) {
|
|
error = xfs_bmap_finish(&args->trans,
|
|
args->flist,
|
|
&committed);
|
|
}
|
|
if (error) {
|
|
ASSERT(committed);
|
|
args->trans = NULL;
|
|
xfs_bmap_cancel(args->flist);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* Commit and start the next trans in the chain.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, dp);
|
|
if (error)
|
|
goto out;
|
|
|
|
} else if (args->rmtblkno > 0) {
|
|
/*
|
|
* Added a "remote" value, just clear the incomplete flag.
|
|
*/
|
|
error = xfs_attr_leaf_clearflag(args);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
retval = error = 0;
|
|
|
|
out:
|
|
if (state)
|
|
xfs_da_state_free(state);
|
|
if (error)
|
|
return(error);
|
|
return(retval);
|
|
}
|
|
|
|
/*
|
|
* Remove a name from a B-tree attribute list.
|
|
*
|
|
* This will involve walking down the Btree, and may involve joining
|
|
* leaf nodes and even joining intermediate nodes up to and including
|
|
* the root node (a special case of an intermediate node).
|
|
*/
|
|
STATIC int
|
|
xfs_attr_node_removename(xfs_da_args_t *args)
|
|
{
|
|
xfs_da_state_t *state;
|
|
xfs_da_state_blk_t *blk;
|
|
xfs_inode_t *dp;
|
|
xfs_dabuf_t *bp;
|
|
int retval, error, committed, forkoff;
|
|
|
|
/*
|
|
* Tie a string around our finger to remind us where we are.
|
|
*/
|
|
dp = args->dp;
|
|
state = xfs_da_state_alloc();
|
|
state->args = args;
|
|
state->mp = dp->i_mount;
|
|
state->blocksize = state->mp->m_sb.sb_blocksize;
|
|
state->node_ents = state->mp->m_attr_node_ents;
|
|
|
|
/*
|
|
* Search to see if name exists, and get back a pointer to it.
|
|
*/
|
|
error = xfs_da_node_lookup_int(state, &retval);
|
|
if (error || (retval != EEXIST)) {
|
|
if (error == 0)
|
|
error = retval;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If there is an out-of-line value, de-allocate the blocks.
|
|
* This is done before we remove the attribute so that we don't
|
|
* overflow the maximum size of a transaction and/or hit a deadlock.
|
|
*/
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
ASSERT(blk->bp != NULL);
|
|
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
if (args->rmtblkno > 0) {
|
|
/*
|
|
* Fill in disk block numbers in the state structure
|
|
* so that we can get the buffers back after we commit
|
|
* several transactions in the following calls.
|
|
*/
|
|
error = xfs_attr_fillstate(state);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Mark the attribute as INCOMPLETE, then bunmapi() the
|
|
* remote value.
|
|
*/
|
|
error = xfs_attr_leaf_setflag(args);
|
|
if (error)
|
|
goto out;
|
|
error = xfs_attr_rmtval_remove(args);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Refill the state structure with buffers, the prior calls
|
|
* released our buffers.
|
|
*/
|
|
error = xfs_attr_refillstate(state);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Remove the name and update the hashvals in the tree.
|
|
*/
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
retval = xfs_attr_leaf_remove(blk->bp, args);
|
|
xfs_da_fixhashpath(state, &state->path);
|
|
|
|
/*
|
|
* Check to see if the tree needs to be collapsed.
|
|
*/
|
|
if (retval && (state->path.active > 1)) {
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_da_join(state);
|
|
if (!error) {
|
|
error = xfs_bmap_finish(&args->trans, args->flist,
|
|
&committed);
|
|
}
|
|
if (error) {
|
|
ASSERT(committed);
|
|
args->trans = NULL;
|
|
xfs_bmap_cancel(args->flist);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* Commit the Btree join operation and start a new trans.
|
|
*/
|
|
error = xfs_trans_roll(&args->trans, dp);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If the result is small enough, push it all into the inode.
|
|
*/
|
|
if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
|
|
/*
|
|
* Have to get rid of the copy of this dabuf in the state.
|
|
*/
|
|
ASSERT(state->path.active == 1);
|
|
ASSERT(state->path.blk[0].bp);
|
|
xfs_da_buf_done(state->path.blk[0].bp);
|
|
state->path.blk[0].bp = NULL;
|
|
|
|
error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
|
|
XFS_ATTR_FORK);
|
|
if (error)
|
|
goto out;
|
|
ASSERT((((xfs_attr_leafblock_t *)bp->data)->hdr.info.magic) ==
|
|
cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
|
|
|
|
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
|
|
/* bp is gone due to xfs_da_shrink_inode */
|
|
if (!error) {
|
|
error = xfs_bmap_finish(&args->trans,
|
|
args->flist,
|
|
&committed);
|
|
}
|
|
if (error) {
|
|
ASSERT(committed);
|
|
args->trans = NULL;
|
|
xfs_bmap_cancel(args->flist);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
} else
|
|
xfs_da_brelse(args->trans, bp);
|
|
}
|
|
error = 0;
|
|
|
|
out:
|
|
xfs_da_state_free(state);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Fill in the disk block numbers in the state structure for the buffers
|
|
* that are attached to the state structure.
|
|
* This is done so that we can quickly reattach ourselves to those buffers
|
|
* after some set of transaction commits have released these buffers.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_fillstate(xfs_da_state_t *state)
|
|
{
|
|
xfs_da_state_path_t *path;
|
|
xfs_da_state_blk_t *blk;
|
|
int level;
|
|
|
|
/*
|
|
* Roll down the "path" in the state structure, storing the on-disk
|
|
* block number for those buffers in the "path".
|
|
*/
|
|
path = &state->path;
|
|
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
|
|
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
|
|
if (blk->bp) {
|
|
blk->disk_blkno = xfs_da_blkno(blk->bp);
|
|
xfs_da_buf_done(blk->bp);
|
|
blk->bp = NULL;
|
|
} else {
|
|
blk->disk_blkno = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Roll down the "altpath" in the state structure, storing the on-disk
|
|
* block number for those buffers in the "altpath".
|
|
*/
|
|
path = &state->altpath;
|
|
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
|
|
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
|
|
if (blk->bp) {
|
|
blk->disk_blkno = xfs_da_blkno(blk->bp);
|
|
xfs_da_buf_done(blk->bp);
|
|
blk->bp = NULL;
|
|
} else {
|
|
blk->disk_blkno = 0;
|
|
}
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Reattach the buffers to the state structure based on the disk block
|
|
* numbers stored in the state structure.
|
|
* This is done after some set of transaction commits have released those
|
|
* buffers from our grip.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_refillstate(xfs_da_state_t *state)
|
|
{
|
|
xfs_da_state_path_t *path;
|
|
xfs_da_state_blk_t *blk;
|
|
int level, error;
|
|
|
|
/*
|
|
* Roll down the "path" in the state structure, storing the on-disk
|
|
* block number for those buffers in the "path".
|
|
*/
|
|
path = &state->path;
|
|
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
|
|
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
|
|
if (blk->disk_blkno) {
|
|
error = xfs_da_read_buf(state->args->trans,
|
|
state->args->dp,
|
|
blk->blkno, blk->disk_blkno,
|
|
&blk->bp, XFS_ATTR_FORK);
|
|
if (error)
|
|
return(error);
|
|
} else {
|
|
blk->bp = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Roll down the "altpath" in the state structure, storing the on-disk
|
|
* block number for those buffers in the "altpath".
|
|
*/
|
|
path = &state->altpath;
|
|
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
|
|
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
|
|
if (blk->disk_blkno) {
|
|
error = xfs_da_read_buf(state->args->trans,
|
|
state->args->dp,
|
|
blk->blkno, blk->disk_blkno,
|
|
&blk->bp, XFS_ATTR_FORK);
|
|
if (error)
|
|
return(error);
|
|
} else {
|
|
blk->bp = NULL;
|
|
}
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Look up a filename in a node attribute list.
|
|
*
|
|
* This routine gets called for any attribute fork that has more than one
|
|
* block, ie: both true Btree attr lists and for single-leaf-blocks with
|
|
* "remote" values taking up more blocks.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_node_get(xfs_da_args_t *args)
|
|
{
|
|
xfs_da_state_t *state;
|
|
xfs_da_state_blk_t *blk;
|
|
int error, retval;
|
|
int i;
|
|
|
|
state = xfs_da_state_alloc();
|
|
state->args = args;
|
|
state->mp = args->dp->i_mount;
|
|
state->blocksize = state->mp->m_sb.sb_blocksize;
|
|
state->node_ents = state->mp->m_attr_node_ents;
|
|
|
|
/*
|
|
* Search to see if name exists, and get back a pointer to it.
|
|
*/
|
|
error = xfs_da_node_lookup_int(state, &retval);
|
|
if (error) {
|
|
retval = error;
|
|
} else if (retval == EEXIST) {
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
ASSERT(blk->bp != NULL);
|
|
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
|
|
/*
|
|
* Get the value, local or "remote"
|
|
*/
|
|
retval = xfs_attr_leaf_getvalue(blk->bp, args);
|
|
if (!retval && (args->rmtblkno > 0)
|
|
&& !(args->flags & ATTR_KERNOVAL)) {
|
|
retval = xfs_attr_rmtval_get(args);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If not in a transaction, we have to release all the buffers.
|
|
*/
|
|
for (i = 0; i < state->path.active; i++) {
|
|
xfs_da_brelse(args->trans, state->path.blk[i].bp);
|
|
state->path.blk[i].bp = NULL;
|
|
}
|
|
|
|
xfs_da_state_free(state);
|
|
return(retval);
|
|
}
|
|
|
|
STATIC int /* error */
|
|
xfs_attr_node_list(xfs_attr_list_context_t *context)
|
|
{
|
|
attrlist_cursor_kern_t *cursor;
|
|
xfs_attr_leafblock_t *leaf;
|
|
xfs_da_intnode_t *node;
|
|
xfs_da_node_entry_t *btree;
|
|
int error, i;
|
|
xfs_dabuf_t *bp;
|
|
|
|
cursor = context->cursor;
|
|
cursor->initted = 1;
|
|
|
|
/*
|
|
* Do all sorts of validation on the passed-in cursor structure.
|
|
* If anything is amiss, ignore the cursor and look up the hashval
|
|
* starting from the btree root.
|
|
*/
|
|
bp = NULL;
|
|
if (cursor->blkno > 0) {
|
|
error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
|
|
&bp, XFS_ATTR_FORK);
|
|
if ((error != 0) && (error != EFSCORRUPTED))
|
|
return(error);
|
|
if (bp) {
|
|
node = bp->data;
|
|
switch (be16_to_cpu(node->hdr.info.magic)) {
|
|
case XFS_DA_NODE_MAGIC:
|
|
trace_xfs_attr_list_wrong_blk(context);
|
|
xfs_da_brelse(NULL, bp);
|
|
bp = NULL;
|
|
break;
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
leaf = bp->data;
|
|
if (cursor->hashval > be32_to_cpu(leaf->entries[
|
|
be16_to_cpu(leaf->hdr.count)-1].hashval)) {
|
|
trace_xfs_attr_list_wrong_blk(context);
|
|
xfs_da_brelse(NULL, bp);
|
|
bp = NULL;
|
|
} else if (cursor->hashval <=
|
|
be32_to_cpu(leaf->entries[0].hashval)) {
|
|
trace_xfs_attr_list_wrong_blk(context);
|
|
xfs_da_brelse(NULL, bp);
|
|
bp = NULL;
|
|
}
|
|
break;
|
|
default:
|
|
trace_xfs_attr_list_wrong_blk(context);
|
|
xfs_da_brelse(NULL, bp);
|
|
bp = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We did not find what we expected given the cursor's contents,
|
|
* so we start from the top and work down based on the hash value.
|
|
* Note that start of node block is same as start of leaf block.
|
|
*/
|
|
if (bp == NULL) {
|
|
cursor->blkno = 0;
|
|
for (;;) {
|
|
error = xfs_da_read_buf(NULL, context->dp,
|
|
cursor->blkno, -1, &bp,
|
|
XFS_ATTR_FORK);
|
|
if (error)
|
|
return(error);
|
|
if (unlikely(bp == NULL)) {
|
|
XFS_ERROR_REPORT("xfs_attr_node_list(2)",
|
|
XFS_ERRLEVEL_LOW,
|
|
context->dp->i_mount);
|
|
return(XFS_ERROR(EFSCORRUPTED));
|
|
}
|
|
node = bp->data;
|
|
if (node->hdr.info.magic ==
|
|
cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
|
|
break;
|
|
if (unlikely(node->hdr.info.magic !=
|
|
cpu_to_be16(XFS_DA_NODE_MAGIC))) {
|
|
XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
|
|
XFS_ERRLEVEL_LOW,
|
|
context->dp->i_mount,
|
|
node);
|
|
xfs_da_brelse(NULL, bp);
|
|
return(XFS_ERROR(EFSCORRUPTED));
|
|
}
|
|
btree = node->btree;
|
|
for (i = 0; i < be16_to_cpu(node->hdr.count);
|
|
btree++, i++) {
|
|
if (cursor->hashval
|
|
<= be32_to_cpu(btree->hashval)) {
|
|
cursor->blkno = be32_to_cpu(btree->before);
|
|
trace_xfs_attr_list_node_descend(context,
|
|
btree);
|
|
break;
|
|
}
|
|
}
|
|
if (i == be16_to_cpu(node->hdr.count)) {
|
|
xfs_da_brelse(NULL, bp);
|
|
return(0);
|
|
}
|
|
xfs_da_brelse(NULL, bp);
|
|
}
|
|
}
|
|
ASSERT(bp != NULL);
|
|
|
|
/*
|
|
* Roll upward through the blocks, processing each leaf block in
|
|
* order. As long as there is space in the result buffer, keep
|
|
* adding the information.
|
|
*/
|
|
for (;;) {
|
|
leaf = bp->data;
|
|
if (unlikely(leaf->hdr.info.magic !=
|
|
cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
|
|
XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
|
|
XFS_ERRLEVEL_LOW,
|
|
context->dp->i_mount, leaf);
|
|
xfs_da_brelse(NULL, bp);
|
|
return(XFS_ERROR(EFSCORRUPTED));
|
|
}
|
|
error = xfs_attr_leaf_list_int(bp, context);
|
|
if (error) {
|
|
xfs_da_brelse(NULL, bp);
|
|
return error;
|
|
}
|
|
if (context->seen_enough || leaf->hdr.info.forw == 0)
|
|
break;
|
|
cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
|
|
xfs_da_brelse(NULL, bp);
|
|
error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
|
|
&bp, XFS_ATTR_FORK);
|
|
if (error)
|
|
return(error);
|
|
if (unlikely((bp == NULL))) {
|
|
XFS_ERROR_REPORT("xfs_attr_node_list(5)",
|
|
XFS_ERRLEVEL_LOW,
|
|
context->dp->i_mount);
|
|
return(XFS_ERROR(EFSCORRUPTED));
|
|
}
|
|
}
|
|
xfs_da_brelse(NULL, bp);
|
|
return(0);
|
|
}
|
|
|
|
|
|
/*========================================================================
|
|
* External routines for manipulating out-of-line attribute values.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Read the value associated with an attribute from the out-of-line buffer
|
|
* that we stored it in.
|
|
*/
|
|
int
|
|
xfs_attr_rmtval_get(xfs_da_args_t *args)
|
|
{
|
|
xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
|
|
xfs_mount_t *mp;
|
|
xfs_daddr_t dblkno;
|
|
void *dst;
|
|
xfs_buf_t *bp;
|
|
int nmap, error, tmp, valuelen, blkcnt, i;
|
|
xfs_dablk_t lblkno;
|
|
|
|
ASSERT(!(args->flags & ATTR_KERNOVAL));
|
|
|
|
mp = args->dp->i_mount;
|
|
dst = args->value;
|
|
valuelen = args->valuelen;
|
|
lblkno = args->rmtblkno;
|
|
while (valuelen > 0) {
|
|
nmap = ATTR_RMTVALUE_MAPSIZE;
|
|
error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
|
|
args->rmtblkcnt,
|
|
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
|
|
NULL, 0, map, &nmap, NULL);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(nmap >= 1);
|
|
|
|
for (i = 0; (i < nmap) && (valuelen > 0); i++) {
|
|
ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
|
|
(map[i].br_startblock != HOLESTARTBLOCK));
|
|
dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
|
|
blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
|
|
error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
|
|
blkcnt, XBF_LOCK | XBF_DONT_BLOCK,
|
|
&bp);
|
|
if (error)
|
|
return(error);
|
|
|
|
tmp = (valuelen < XFS_BUF_SIZE(bp))
|
|
? valuelen : XFS_BUF_SIZE(bp);
|
|
xfs_buf_iomove(bp, 0, tmp, dst, XBRW_READ);
|
|
xfs_buf_relse(bp);
|
|
dst += tmp;
|
|
valuelen -= tmp;
|
|
|
|
lblkno += 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.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_rmtval_set(xfs_da_args_t *args)
|
|
{
|
|
xfs_mount_t *mp;
|
|
xfs_fileoff_t lfileoff;
|
|
xfs_inode_t *dp;
|
|
xfs_bmbt_irec_t map;
|
|
xfs_daddr_t dblkno;
|
|
void *src;
|
|
xfs_buf_t *bp;
|
|
xfs_dablk_t lblkno;
|
|
int blkcnt, valuelen, nmap, error, tmp, committed;
|
|
|
|
dp = args->dp;
|
|
mp = dp->i_mount;
|
|
src = args->value;
|
|
|
|
/*
|
|
* Find a "hole" in the attribute address space large enough for
|
|
* us to drop the new attribute's value into.
|
|
*/
|
|
blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
|
|
lfileoff = 0;
|
|
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) {
|
|
/*
|
|
* Allocate a single extent, up to the size of the value.
|
|
*/
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
nmap = 1;
|
|
error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
|
|
blkcnt,
|
|
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
|
|
XFS_BMAPI_WRITE,
|
|
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);
|
|
|
|
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;
|
|
valuelen = args->valuelen;
|
|
while (valuelen > 0) {
|
|
/*
|
|
* Try to remember where we decided to put the value.
|
|
*/
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
nmap = 1;
|
|
error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
|
|
args->rmtblkcnt,
|
|
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
|
|
args->firstblock, 0, &map, &nmap,
|
|
NULL);
|
|
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),
|
|
blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
|
|
|
|
bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt,
|
|
XBF_LOCK | XBF_DONT_BLOCK);
|
|
ASSERT(bp);
|
|
ASSERT(!XFS_BUF_GETERROR(bp));
|
|
|
|
tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
|
|
XFS_BUF_SIZE(bp);
|
|
xfs_buf_iomove(bp, 0, tmp, src, XBRW_WRITE);
|
|
if (tmp < XFS_BUF_SIZE(bp))
|
|
xfs_buf_zero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
|
|
if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
|
|
return (error);
|
|
}
|
|
src += tmp;
|
|
valuelen -= tmp;
|
|
|
|
lblkno += 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.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_rmtval_remove(xfs_da_args_t *args)
|
|
{
|
|
xfs_mount_t *mp;
|
|
xfs_bmbt_irec_t map;
|
|
xfs_buf_t *bp;
|
|
xfs_daddr_t dblkno;
|
|
xfs_dablk_t lblkno;
|
|
int valuelen, blkcnt, nmap, error, done, committed;
|
|
|
|
mp = args->dp->i_mount;
|
|
|
|
/*
|
|
* Roll through the "value", invalidating the attribute value's
|
|
* blocks.
|
|
*/
|
|
lblkno = args->rmtblkno;
|
|
valuelen = args->rmtblkcnt;
|
|
while (valuelen > 0) {
|
|
/*
|
|
* Try to remember where we decided to put the value.
|
|
*/
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
nmap = 1;
|
|
error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
|
|
args->rmtblkcnt,
|
|
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
|
|
args->firstblock, 0, &map, &nmap,
|
|
args->flist);
|
|
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),
|
|
blkcnt = 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, blkcnt, XBF_TRYLOCK);
|
|
if (bp) {
|
|
XFS_BUF_STALE(bp);
|
|
XFS_BUF_UNDELAYWRITE(bp);
|
|
xfs_buf_relse(bp);
|
|
bp = NULL;
|
|
}
|
|
|
|
valuelen -= map.br_blockcount;
|
|
|
|
lblkno += map.br_blockcount;
|
|
}
|
|
|
|
/*
|
|
* Keep de-allocating extents until the remote-value region is gone.
|
|
*/
|
|
lblkno = args->rmtblkno;
|
|
blkcnt = args->rmtblkcnt;
|
|
done = 0;
|
|
while (!done) {
|
|
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);
|
|
|
|
/*
|
|
* 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);
|
|
}
|