forked from Minki/linux
654805367d
Check extended attribute entry names for invalid characters. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
1356 lines
33 KiB
C
1356 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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_mount.h"
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#include "xfs_defer.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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/*
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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_args_init(
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struct xfs_da_args *args,
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struct xfs_inode *dp,
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const unsigned char *name,
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int flags)
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{
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if (!name)
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return -EINVAL;
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memset(args, 0, sizeof(*args));
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args->geo = dp->i_mount->m_attr_geo;
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args->whichfork = XFS_ATTR_FORK;
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args->dp = dp;
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args->flags = flags;
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args->name = name;
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args->namelen = strlen((const char *)name);
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if (args->namelen >= MAXNAMELEN)
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return -EFAULT; /* match IRIX behaviour */
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args->hashval = xfs_da_hashname(args->name, args->namelen);
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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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/* Retrieve an extended attribute and its value. Must have ilock. */
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int
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xfs_attr_get_ilocked(
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struct xfs_inode *ip,
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struct xfs_da_args *args)
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{
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
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if (!xfs_inode_hasattr(ip))
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return -ENOATTR;
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else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
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return xfs_attr_shortform_getvalue(args);
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else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
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return xfs_attr_leaf_get(args);
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else
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return xfs_attr_node_get(args);
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}
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/* Retrieve an extended attribute by name, and its value. */
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int
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xfs_attr_get(
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struct xfs_inode *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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struct xfs_da_args args;
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uint lock_mode;
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int error;
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XFS_STATS_INC(ip->i_mount, 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_args_init(&args, ip, name, flags);
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if (error)
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return error;
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args.value = value;
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args.valuelen = *valuelenp;
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/* Entirely possible to look up a name which doesn't exist */
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args.op_flags = XFS_DA_OP_OKNOENT;
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lock_mode = xfs_ilock_attr_map_shared(ip);
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error = xfs_attr_get_ilocked(ip, &args);
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xfs_iunlock(ip, lock_mode);
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*valuelenp = args.valuelen;
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return error == -EEXIST ? 0 : 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_da_args *args,
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int *local)
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{
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struct xfs_mount *mp = args->dp->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(args, 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 > (args->geo->blksize / 2)) {
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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, args->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_try_sf_addname(
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struct xfs_inode *dp,
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struct xfs_da_args *args)
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{
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struct xfs_mount *mp = dp->i_mount;
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int error, error2;
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error = xfs_attr_shortform_addname(args);
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if (error == -ENOSPC)
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return error;
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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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if (!error && (args->flags & ATTR_KERNOTIME) == 0)
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xfs_trans_ichgtime(args->trans, dp, XFS_ICHGTIME_CHG);
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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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error2 = xfs_trans_commit(args->trans);
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args->trans = NULL;
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return error ? error : error2;
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}
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/*
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* Set the attribute specified in @args.
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*/
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int
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xfs_attr_set_args(
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struct xfs_da_args *args,
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struct xfs_buf **leaf_bp)
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{
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struct xfs_inode *dp = args->dp;
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int error;
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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 the inode.
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*/
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error = xfs_attr_try_sf_addname(dp, args);
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if (error != -ENOSPC)
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return error;
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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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error = xfs_attr_shortform_to_leaf(args, leaf_bp);
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if (error)
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return error;
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/*
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* Prevent the leaf buffer from being unlocked so that a
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* concurrent AIL push cannot grab the half-baked leaf
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* buffer and run into problems with the write verifier.
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*/
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xfs_trans_bhold(args->trans, *leaf_bp);
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error = xfs_defer_finish(&args->trans);
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if (error)
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return error;
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/*
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* Commit the leaf transformation. We'll need another
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* (linked) transaction to add the new attribute to the
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* leaf.
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*/
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error = xfs_trans_roll_inode(&args->trans, dp);
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if (error)
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return error;
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xfs_trans_bjoin(args->trans, *leaf_bp);
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*leaf_bp = NULL;
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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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return error;
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}
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/*
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* Remove the attribute specified in @args.
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*/
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int
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xfs_attr_remove_args(
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struct xfs_da_args *args)
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{
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struct xfs_inode *dp = args->dp;
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int error;
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if (!xfs_inode_hasattr(dp)) {
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error = -ENOATTR;
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} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
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ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
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error = xfs_attr_shortform_remove(args);
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} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
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error = xfs_attr_leaf_removename(args);
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} else {
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error = xfs_attr_node_removename(args);
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}
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return error;
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}
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int
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xfs_attr_set(
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struct xfs_inode *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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struct xfs_mount *mp = dp->i_mount;
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struct xfs_buf *leaf_bp = NULL;
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struct xfs_da_args args;
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struct xfs_trans_res tres;
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int rsvd = (flags & ATTR_ROOT) != 0;
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int error, local;
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XFS_STATS_INC(mp, 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_args_init(&args, dp, name, flags);
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if (error)
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return error;
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args.value = value;
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args.valuelen = valuelen;
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args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
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args.total = xfs_attr_calc_size(&args, &local);
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error = xfs_qm_dqattach(dp);
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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(args.namelen, valuelen);
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error = xfs_bmap_add_attrfork(dp, sf_size, rsvd);
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if (error)
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return error;
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}
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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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/*
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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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error = xfs_trans_alloc(mp, &tres, args.total, 0,
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rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
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if (error)
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return error;
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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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goto out_trans_cancel;
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xfs_trans_ijoin(args.trans, dp, 0);
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error = xfs_attr_set_args(&args, &leaf_bp);
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if (error)
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goto out_release_leaf;
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if (!args.trans) {
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/* shortform attribute has already been committed */
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goto out_unlock;
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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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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);
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out_unlock:
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xfs_iunlock(dp, XFS_ILOCK_EXCL);
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return error;
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out_release_leaf:
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if (leaf_bp)
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xfs_trans_brelse(args.trans, leaf_bp);
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out_trans_cancel:
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if (args.trans)
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xfs_trans_cancel(args.trans);
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goto out_unlock;
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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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int
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xfs_attr_remove(
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struct xfs_inode *dp,
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const unsigned char *name,
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int flags)
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{
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struct xfs_mount *mp = dp->i_mount;
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struct xfs_da_args args;
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int error;
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XFS_STATS_INC(mp, xs_attr_remove);
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if (XFS_FORCED_SHUTDOWN(dp->i_mount))
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return -EIO;
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error = xfs_attr_args_init(&args, dp, name, flags);
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if (error)
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return error;
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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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error = xfs_qm_dqattach(dp);
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if (error)
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return error;
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|
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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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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrrm,
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XFS_ATTRRM_SPACE_RES(mp), 0,
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(flags & ATTR_ROOT) ? XFS_TRANS_RESERVE : 0,
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&args.trans);
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if (error)
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return error;
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xfs_ilock(dp, XFS_ILOCK_EXCL);
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/*
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* No need to make quota reservations here. We expect to release some
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* blocks not allocate in the common case.
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*/
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xfs_trans_ijoin(args.trans, dp, 0);
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error = xfs_attr_remove_args(&args);
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if (error)
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goto out;
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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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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);
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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_iunlock(dp, XFS_ILOCK_EXCL);
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return error;
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}
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|
|
/*========================================================================
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* External routines when attribute list is inside the inode
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|
*========================================================================*/
|
|
|
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/*
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* Add a name to the shortform attribute list structure
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* This is the external routine.
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*/
|
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STATIC int
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xfs_attr_shortform_addname(xfs_da_args_t *args)
|
|
{
|
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int newsize, forkoff, retval;
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|
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trace_xfs_attr_sf_addname(args);
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retval = xfs_attr_shortform_lookup(args);
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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);
|
|
if (retval)
|
|
return retval;
|
|
/*
|
|
* Since we have removed the old attr, clear ATTR_REPLACE so
|
|
* that the leaf format add routine won't trip over the attr
|
|
* not being around.
|
|
*/
|
|
args->flags &= ~ATTR_REPLACE;
|
|
}
|
|
|
|
if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
|
|
args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
|
|
return -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 -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(
|
|
struct xfs_da_args *args)
|
|
{
|
|
struct xfs_inode *dp;
|
|
struct xfs_buf *bp;
|
|
int retval, error, 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.
|
|
*/
|
|
error = xfs_attr3_leaf_to_node(args);
|
|
if (error)
|
|
return error;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Commit the current trans (including the inode) and start
|
|
* a new one.
|
|
*/
|
|
error = xfs_trans_roll_inode(&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_inode(&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))) {
|
|
error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
|
|
/* bp is gone due to xfs_da_shrink_inode */
|
|
if (error)
|
|
return error;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Commit the remove and start the next trans in series.
|
|
*/
|
|
error = xfs_trans_roll_inode(&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(
|
|
struct xfs_da_args *args)
|
|
{
|
|
struct xfs_inode *dp;
|
|
struct xfs_buf *bp;
|
|
int error, 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))) {
|
|
error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
|
|
/* bp is gone due to xfs_da_shrink_inode */
|
|
if (error)
|
|
return error;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
return error;
|
|
}
|
|
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 > geo->blksize
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* 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(
|
|
struct xfs_da_args *args)
|
|
{
|
|
struct xfs_da_state *state;
|
|
struct xfs_da_state_blk *blk;
|
|
struct xfs_inode *dp;
|
|
struct xfs_mount *mp;
|
|
int 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;
|
|
|
|
/*
|
|
* 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;
|
|
error = xfs_attr3_leaf_to_node(args);
|
|
if (error)
|
|
goto out;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Commit the node conversion and start the next
|
|
* trans in the chain.
|
|
*/
|
|
error = xfs_trans_roll_inode(&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.
|
|
*/
|
|
error = xfs_da3_split(state);
|
|
if (error)
|
|
goto out;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
goto out;
|
|
} 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_inode(&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->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)) {
|
|
error = xfs_da3_join(state);
|
|
if (error)
|
|
goto out;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Commit and start the next trans in the chain.
|
|
*/
|
|
error = xfs_trans_roll_inode(&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(
|
|
struct xfs_da_args *args)
|
|
{
|
|
struct xfs_da_state *state;
|
|
struct xfs_da_state_blk *blk;
|
|
struct xfs_inode *dp;
|
|
struct xfs_buf *bp;
|
|
int retval, error, 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;
|
|
|
|
/*
|
|
* 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)) {
|
|
error = xfs_da3_join(state);
|
|
if (error)
|
|
goto out;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
goto out;
|
|
/*
|
|
* Commit the Btree join operation and start a new trans.
|
|
*/
|
|
error = xfs_trans_roll_inode(&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))) {
|
|
error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
|
|
/* bp is gone due to xfs_da_shrink_inode */
|
|
if (error)
|
|
goto out;
|
|
error = xfs_defer_finish(&args->trans);
|
|
if (error)
|
|
goto out;
|
|
} 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;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/* Returns true if the attribute entry name is valid. */
|
|
bool
|
|
xfs_attr_namecheck(
|
|
const void *name,
|
|
size_t length)
|
|
{
|
|
/*
|
|
* MAXNAMELEN includes the trailing null, but (name/length) leave it
|
|
* out, so use >= for the length check.
|
|
*/
|
|
if (length >= MAXNAMELEN)
|
|
return false;
|
|
|
|
/* There shouldn't be any nulls here */
|
|
return !memchr(name, 0, length);
|
|
}
|