mirror of
https://github.com/torvalds/linux
synced 2024-09-21 19:47:35 +00:00
8275cdd0e7
Commit e461fcb ("xfs: remote attribute lookups require the value
length") passes the remote attribute length in the xfs_da_args
structure on lookup so that CRC calculations and validity checking
can be performed correctly by related code. This, unfortunately has
the side effect of changing the args->valuelen parameter in cases
where it shouldn't.
That is, when we replace a remote attribute, the incoming
replacement stores the value and length in args->value and
args->valuelen, but then the lookup which finds the existing remote
attribute overwrites args->valuelen with the length of the remote
attribute being replaced. Hence when we go to create the new
attribute, we create it of the size of the existing remote
attribute, not the size it is supposed to be. When the new attribute
is much smaller than the old attribute, this results in a
transaction overrun and an ASSERT() failure on a debug kernel:
XFS: Assertion failed: tp->t_blk_res_used <= tp->t_blk_res, file: fs/xfs/xfs_trans.c, line: 331
Fix this by keeping the remote attribute value length separate to
the attribute value length in the xfs_da_args structure. The enables
us to pass the length of the remote attribute to be removed without
overwriting the new attribute's length.
Also, ensure that when we save remote block contexts for a later
rename we zero the original state variables so that we don't confuse
the state of the attribute to be removes with the state of the new
attribute that we just added. [Spotted by Brain Foster.]
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
1563 lines
39 KiB
C
1563 lines
39 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_shared.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_attr_sf.h"
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#include "xfs_inode.h"
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#include "xfs_alloc.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_attr.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_attr_remote.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_dinode.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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/*
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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_fillstate(xfs_da_state_t *state);
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STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
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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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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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uint lock_mode;
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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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lock_mode = xfs_ilock_attr_map_shared(ip);
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error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
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xfs_iunlock(ip, lock_mode);
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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_attr3_rmt_blocks(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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struct xfs_mount *mp = dp->i_mount;
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struct xfs_trans_res tres;
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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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tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
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M_RES(mp)->tr_attrsetrt.tr_logres * args.total;
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tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
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tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
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error = xfs_trans_reserve(args.trans, &tres, args.total, 0);
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if (error) {
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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, 0);
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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, 0);
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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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|
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if (XFS_FORCED_SHUTDOWN(dp->i_mount))
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return (EIO);
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|
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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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|
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return xfs_attr_set_int(dp, &xname, value, valuelen, flags);
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}
|
|
|
|
/*
|
|
* Generic handler routine to remove a name from an attribute list.
|
|
* Transitions attribute list from Btree to shortform as necessary.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
|
|
{
|
|
xfs_da_args_t args;
|
|
xfs_fsblock_t firstblock;
|
|
xfs_bmap_free_t flist;
|
|
int error;
|
|
xfs_mount_t *mp = dp->i_mount;
|
|
|
|
/*
|
|
* Fill in the arg structure for this request.
|
|
*/
|
|
memset((char *)&args, 0, sizeof(args));
|
|
args.name = name->name;
|
|
args.namelen = name->len;
|
|
args.flags = flags;
|
|
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;
|
|
|
|
/*
|
|
* we have no control over the attribute names that userspace passes us
|
|
* to remove, so we have to allow the name lookup prior to attribute
|
|
* removal to fail.
|
|
*/
|
|
args.op_flags = XFS_DA_OP_OKNOENT;
|
|
|
|
/*
|
|
* Attach the dquots to the inode.
|
|
*/
|
|
error = xfs_qm_dqattach(dp, 0);
|
|
if (error)
|
|
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;
|
|
|
|
error = xfs_trans_reserve(args.trans, &M_RES(mp)->tr_attrrm,
|
|
XFS_ATTRRM_SPACE_RES(mp), 0);
|
|
if (error) {
|
|
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, 0);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
|
|
/*========================================================================
|
|
* 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;
|
|
|
|
trace_xfs_attr_sf_addname(args);
|
|
|
|
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;
|
|
struct xfs_buf *bp;
|
|
int retval, error, committed, forkoff;
|
|
|
|
trace_xfs_attr_leaf_addname(args);
|
|
|
|
/*
|
|
* Read the (only) block in the attribute list in.
|
|
*/
|
|
dp = args->dp;
|
|
args->blkno = 0;
|
|
error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* 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_attr3_leaf_lookup_int(bp, args);
|
|
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
|
|
xfs_trans_brelse(args->trans, bp);
|
|
return retval;
|
|
} else if (retval == EEXIST) {
|
|
if (args->flags & ATTR_CREATE) { /* pure create op */
|
|
xfs_trans_brelse(args->trans, bp);
|
|
return retval;
|
|
}
|
|
|
|
trace_xfs_attr_leaf_replace(args);
|
|
|
|
/* save the attribute state for later removal*/
|
|
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;
|
|
args->rmtvaluelen2 = args->rmtvaluelen;
|
|
|
|
/*
|
|
* clear the remote attr state now that it is saved so that the
|
|
* values reflect the state of the attribute we are about to
|
|
* add, not the attribute we just found and will remove later.
|
|
*/
|
|
args->rmtblkno = 0;
|
|
args->rmtblkcnt = 0;
|
|
args->rmtvaluelen = 0;
|
|
}
|
|
|
|
/*
|
|
* Add the attribute to the leaf block, transitioning to a Btree
|
|
* if required.
|
|
*/
|
|
retval = xfs_attr3_leaf_add(bp, args);
|
|
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_attr3_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, 0);
|
|
|
|
/*
|
|
* 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_attr3_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;
|
|
args->rmtvaluelen = args->rmtvaluelen2;
|
|
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_attr3_leaf_read(args->trans, args->dp, args->blkno,
|
|
-1, &bp);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_attr3_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_attr3_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, 0);
|
|
}
|
|
|
|
/*
|
|
* 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_attr3_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;
|
|
struct xfs_buf *bp;
|
|
int error, committed, forkoff;
|
|
|
|
trace_xfs_attr_leaf_removename(args);
|
|
|
|
/*
|
|
* Remove the attribute.
|
|
*/
|
|
dp = args->dp;
|
|
args->blkno = 0;
|
|
error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_attr3_leaf_lookup_int(bp, args);
|
|
if (error == ENOATTR) {
|
|
xfs_trans_brelse(args->trans, bp);
|
|
return error;
|
|
}
|
|
|
|
xfs_attr3_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_attr3_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, 0);
|
|
}
|
|
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)
|
|
{
|
|
struct xfs_buf *bp;
|
|
int error;
|
|
|
|
trace_xfs_attr_leaf_get(args);
|
|
|
|
args->blkno = 0;
|
|
error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
|
|
if (error)
|
|
return error;
|
|
|
|
error = xfs_attr3_leaf_lookup_int(bp, args);
|
|
if (error != EEXIST) {
|
|
xfs_trans_brelse(args->trans, bp);
|
|
return error;
|
|
}
|
|
error = xfs_attr3_leaf_getvalue(bp, args);
|
|
xfs_trans_brelse(args->trans, bp);
|
|
if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
|
|
error = xfs_attr_rmtval_get(args);
|
|
}
|
|
return 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;
|
|
|
|
trace_xfs_attr_node_addname(args);
|
|
|
|
/*
|
|
* 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_da3_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;
|
|
|
|
trace_xfs_attr_node_replace(args);
|
|
|
|
/* save the attribute state for later removal*/
|
|
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->rmtvaluelen2 = args->rmtvaluelen;
|
|
|
|
/*
|
|
* clear the remote attr state now that it is saved so that the
|
|
* values reflect the state of the attribute we are about to
|
|
* add, not the attribute we just found and will remove later.
|
|
*/
|
|
args->rmtblkno = 0;
|
|
args->rmtblkcnt = 0;
|
|
args->rmtvaluelen = 0;
|
|
}
|
|
|
|
retval = xfs_attr3_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);
|
|
state = NULL;
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_attr3_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, 0);
|
|
|
|
/*
|
|
* 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_da3_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, 0);
|
|
} else {
|
|
/*
|
|
* Addition succeeded, update Btree hashvals.
|
|
*/
|
|
xfs_da3_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_attr3_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;
|
|
args->rmtvaluelen = args->rmtvaluelen2;
|
|
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_da3_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_attr3_leaf_remove(blk->bp, args);
|
|
xfs_da3_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_da3_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, 0);
|
|
}
|
|
|
|
/*
|
|
* 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_attr3_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;
|
|
struct xfs_buf *bp;
|
|
int retval, error, committed, forkoff;
|
|
|
|
trace_xfs_attr_node_removename(args);
|
|
|
|
/*
|
|
* 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_da3_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_attr3_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_attr3_leaf_remove(blk->bp, args);
|
|
xfs_da3_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_da3_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, 0);
|
|
|
|
/*
|
|
* 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);
|
|
state->path.blk[0].bp = NULL;
|
|
|
|
error = xfs_attr3_leaf_read(args->trans, args->dp, 0, -1, &bp);
|
|
if (error)
|
|
goto out;
|
|
|
|
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
|
|
xfs_bmap_init(args->flist, args->firstblock);
|
|
error = xfs_attr3_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, 0);
|
|
} else
|
|
xfs_trans_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;
|
|
|
|
trace_xfs_attr_fillstate(state->args);
|
|
|
|
/*
|
|
* 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_BUF_ADDR(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_BUF_ADDR(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;
|
|
|
|
trace_xfs_attr_refillstate(state->args);
|
|
|
|
/*
|
|
* 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_da3_node_read(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_da3_node_read(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;
|
|
|
|
trace_xfs_attr_node_get(args);
|
|
|
|
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_da3_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_attr3_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_trans_brelse(args->trans, state->path.blk[i].bp);
|
|
state->path.blk[i].bp = NULL;
|
|
}
|
|
|
|
xfs_da_state_free(state);
|
|
return(retval);
|
|
}
|