/* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_types.h" #include "xfs_bit.h" #include "xfs_log.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_mount.h" #include "xfs_da_btree.h" #include "xfs_bmap_btree.h" #include "xfs_attr_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_alloc.h" #include "xfs_inode_item.h" #include "xfs_bmap.h" #include "xfs_attr.h" #include "xfs_attr_leaf.h" #include "xfs_error.h" #include "xfs_quota.h" #include "xfs_trans_space.h" #include "xfs_vnodeops.h" #include "xfs_trace.h" /* * xfs_attr.c * * Provide the external interfaces to manage attribute lists. */ /*======================================================================== * Function prototypes for the kernel. *========================================================================*/ /* * Internal routines when attribute list fits inside the inode. */ STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args); /* * Internal routines when attribute list is one block. */ STATIC int xfs_attr_leaf_get(xfs_da_args_t *args); STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args); STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args); STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context); /* * Internal routines when attribute list is more than one block. */ STATIC int xfs_attr_node_get(xfs_da_args_t *args); STATIC int xfs_attr_node_addname(xfs_da_args_t *args); STATIC int xfs_attr_node_removename(xfs_da_args_t *args); STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context); STATIC int xfs_attr_fillstate(xfs_da_state_t *state); STATIC int xfs_attr_refillstate(xfs_da_state_t *state); /* * Routines to manipulate out-of-line attribute values. */ STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args); STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args); #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */ STATIC int xfs_attr_name_to_xname( struct xfs_name *xname, const unsigned char *aname) { if (!aname) return EINVAL; xname->name = aname; xname->len = strlen((char *)aname); if (xname->len >= MAXNAMELEN) return EFAULT; /* match IRIX behaviour */ return 0; } STATIC int xfs_inode_hasattr( struct xfs_inode *ip) { if (!XFS_IFORK_Q(ip) || (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && ip->i_d.di_anextents == 0)) return 0; return 1; } /*======================================================================== * Overall external interface routines. *========================================================================*/ STATIC int xfs_attr_get_int( struct xfs_inode *ip, struct xfs_name *name, unsigned char *value, int *valuelenp, int flags) { xfs_da_args_t args; int error; if (!xfs_inode_hasattr(ip)) return ENOATTR; /* * Fill in the arg structure for this request. */ memset((char *)&args, 0, sizeof(args)); args.name = name->name; args.namelen = name->len; args.value = value; args.valuelen = *valuelenp; args.flags = flags; args.hashval = xfs_da_hashname(args.name, args.namelen); args.dp = ip; args.whichfork = XFS_ATTR_FORK; /* * Decide on what work routines to call based on the inode size. */ if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) { error = xfs_attr_shortform_getvalue(&args); } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) { error = xfs_attr_leaf_get(&args); } else { error = xfs_attr_node_get(&args); } /* * Return the number of bytes in the value to the caller. */ *valuelenp = args.valuelen; if (error == EEXIST) error = 0; return(error); } int xfs_attr_get( xfs_inode_t *ip, const unsigned char *name, unsigned char *value, int *valuelenp, int flags) { int error; struct xfs_name xname; XFS_STATS_INC(xs_attr_get); if (XFS_FORCED_SHUTDOWN(ip->i_mount)) return(EIO); error = xfs_attr_name_to_xname(&xname, name); if (error) return error; xfs_ilock(ip, XFS_ILOCK_SHARED); error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags); xfs_iunlock(ip, XFS_ILOCK_SHARED); return(error); } /* * Calculate how many blocks we need for the new attribute, */ STATIC int xfs_attr_calc_size( struct xfs_inode *ip, int namelen, int valuelen, int *local) { struct xfs_mount *mp = ip->i_mount; int size; int nblks; /* * Determine space new attribute will use, and if it would be * "local" or "remote" (note: local != inline). */ size = xfs_attr_leaf_newentsize(namelen, valuelen, mp->m_sb.sb_blocksize, local); nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK); if (*local) { if (size > (mp->m_sb.sb_blocksize >> 1)) { /* Double split possible */ nblks *= 2; } } else { /* * Out of line attribute, cannot double split, but * make room for the attribute value itself. */ uint dblocks = XFS_B_TO_FSB(mp, valuelen); nblks += dblocks; nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK); } return nblks; } STATIC int xfs_attr_set_int( struct xfs_inode *dp, struct xfs_name *name, unsigned char *value, int valuelen, int flags) { xfs_da_args_t args; xfs_fsblock_t firstblock; xfs_bmap_free_t flist; int error, err2, committed; xfs_mount_t *mp = dp->i_mount; int rsvd = (flags & ATTR_ROOT) != 0; int local; /* * Attach the dquots to the inode. */ error = xfs_qm_dqattach(dp, 0); if (error) return error; /* * If the inode doesn't have an attribute fork, add one. * (inode must not be locked when we call this routine) */ if (XFS_IFORK_Q(dp) == 0) { int sf_size = sizeof(xfs_attr_sf_hdr_t) + XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen); if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd))) return(error); } /* * Fill in the arg structure for this request. */ memset((char *)&args, 0, sizeof(args)); args.name = name->name; args.namelen = name->len; args.value = value; args.valuelen = valuelen; args.flags = flags; args.hashval = xfs_da_hashname(args.name, args.namelen); args.dp = dp; args.firstblock = &firstblock; args.flist = &flist; args.whichfork = XFS_ATTR_FORK; args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT; /* Size is now blocks for attribute data */ args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local); /* * 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_SET); /* * Root fork attributes can use reserved data blocks for this * operation if necessary */ if (rsvd) args.trans->t_flags |= XFS_TRANS_RESERVE; if ((error = xfs_trans_reserve(args.trans, args.total, XFS_ATTRSET_LOG_RES(mp, args.total), 0, XFS_TRANS_PERM_LOG_RES, XFS_ATTRSET_LOG_COUNT))) { xfs_trans_cancel(args.trans, 0); return(error); } xfs_ilock(dp, XFS_ILOCK_EXCL); error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0, rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES : XFS_QMOPT_RES_REGBLKS); if (error) { xfs_iunlock(dp, XFS_ILOCK_EXCL); xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES); return (error); } xfs_trans_ijoin(args.trans, dp, 0); /* * If the attribute list is non-existent or a shortform list, * upgrade it to a single-leaf-block attribute list. */ if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) || ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) && (dp->i_d.di_anextents == 0))) { /* * Build initial attribute list (if required). */ if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) xfs_attr_shortform_create(&args); /* * Try to add the attr to the attribute list in * the inode. */ error = xfs_attr_shortform_addname(&args); if (error != ENOSPC) { /* * Commit the shortform mods, and we're done. * NOTE: this is also the error path (EEXIST, etc). */ ASSERT(args.trans != NULL); /* * 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 (!error && (flags & ATTR_KERNOTIME) == 0) { xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG); } err2 = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES); xfs_iunlock(dp, XFS_ILOCK_EXCL); return(error == 0 ? err2 : error); } /* * It won't fit in the shortform, transform to a leaf block. * GROT: another possible req'mt for a double-split btree op. */ xfs_bmap_init(args.flist, args.firstblock); error = xfs_attr_shortform_to_leaf(&args); if (!error) { error = xfs_bmap_finish(&args.trans, args.flist, &committed); } if (error) { ASSERT(committed); args.trans = NULL; xfs_bmap_cancel(&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 leaf transformation. We'll need another (linked) * transaction to add the new attribute to the leaf. */ error = xfs_trans_roll(&args.trans, dp); if (error) goto out; } if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) { error = xfs_attr_leaf_addname(&args); } else { error = xfs_attr_node_addname(&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_set( xfs_inode_t *dp, const unsigned char *name, unsigned char *value, int valuelen, int flags) { int error; struct xfs_name xname; XFS_STATS_INC(xs_attr_set); if (XFS_FORCED_SHUTDOWN(dp->i_mount)) return (EIO); error = xfs_attr_name_to_xname(&xname, name); if (error) return error; return xfs_attr_set_int(dp, &xname, value, valuelen, flags); } /* * 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); args.dp = dp; args.firstblock = &firstblock; args.flist = &flist; args.total = 0; 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; if ((error = xfs_trans_reserve(args.trans, XFS_ATTRRM_SPACE_RES(mp), XFS_ATTRRM_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ATTRRM_LOG_COUNT))) { xfs_trans_cancel(args.trans, 0); return(error); } xfs_ilock(dp, XFS_ILOCK_EXCL); /* * No need to make quota reservations here. We expect to release some * blocks not allocate in the common case. */ xfs_trans_ijoin(args.trans, dp, 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); } int xfs_attr_list_int(xfs_attr_list_context_t *context) { int error; xfs_inode_t *dp = context->dp; XFS_STATS_INC(xs_attr_list); if (XFS_FORCED_SHUTDOWN(dp->i_mount)) return EIO; xfs_ilock(dp, XFS_ILOCK_SHARED); /* * Decide on what work routines to call based on the inode size. */ if (!xfs_inode_hasattr(dp)) { error = 0; } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) { error = xfs_attr_shortform_list(context); } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) { error = xfs_attr_leaf_list(context); } else { error = xfs_attr_node_list(context); } xfs_iunlock(dp, XFS_ILOCK_SHARED); return error; } #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \ (((struct attrlist_ent *) 0)->a_name - (char *) 0) #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \ ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \ & ~(sizeof(u_int32_t)-1)) /* * Format an attribute and copy it out to the user's buffer. * Take care to check values and protect against them changing later, * we may be reading them directly out of a user buffer. */ /*ARGSUSED*/ STATIC int xfs_attr_put_listent( xfs_attr_list_context_t *context, int flags, unsigned char *name, int namelen, int valuelen, unsigned char *value) { struct attrlist *alist = (struct attrlist *)context->alist; attrlist_ent_t *aep; int arraytop; ASSERT(!(context->flags & ATTR_KERNOVAL)); ASSERT(context->count >= 0); ASSERT(context->count < (ATTR_MAX_VALUELEN/8)); ASSERT(context->firstu >= sizeof(*alist)); ASSERT(context->firstu <= context->bufsize); /* * Only list entries in the right namespace. */ if (((context->flags & ATTR_SECURE) == 0) != ((flags & XFS_ATTR_SECURE) == 0)) return 0; if (((context->flags & ATTR_ROOT) == 0) != ((flags & XFS_ATTR_ROOT) == 0)) return 0; arraytop = sizeof(*alist) + context->count * sizeof(alist->al_offset[0]); context->firstu -= ATTR_ENTSIZE(namelen); if (context->firstu < arraytop) { trace_xfs_attr_list_full(context); alist->al_more = 1; context->seen_enough = 1; return 1; } aep = (attrlist_ent_t *)&context->alist[context->firstu]; aep->a_valuelen = valuelen; memcpy(aep->a_name, name, namelen); aep->a_name[namelen] = 0; alist->al_offset[context->count++] = context->firstu; alist->al_count = context->count; trace_xfs_attr_list_add(context); return 0; } /* * Generate a list of extended attribute names and optionally * also value lengths. Positive return value follows the XFS * convention of being an error, zero or negative return code * is the length of the buffer returned (negated), indicating * success. */ int xfs_attr_list( xfs_inode_t *dp, char *buffer, int bufsize, int flags, attrlist_cursor_kern_t *cursor) { xfs_attr_list_context_t context; struct attrlist *alist; int error; /* * Validate the cursor. */ if (cursor->pad1 || cursor->pad2) return(XFS_ERROR(EINVAL)); if ((cursor->initted == 0) && (cursor->hashval || cursor->blkno || cursor->offset)) return XFS_ERROR(EINVAL); /* * Check for a properly aligned buffer. */ if (((long)buffer) & (sizeof(int)-1)) return XFS_ERROR(EFAULT); if (flags & ATTR_KERNOVAL) bufsize = 0; /* * Initialize the output buffer. */ memset(&context, 0, sizeof(context)); context.dp = dp; context.cursor = cursor; context.resynch = 1; context.flags = flags; context.alist = buffer; context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */ context.firstu = context.bufsize; context.put_listent = xfs_attr_put_listent; alist = (struct attrlist *)context.alist; alist->al_count = 0; alist->al_more = 0; alist->al_offset[0] = context.bufsize; error = xfs_attr_list_int(&context); ASSERT(error >= 0); return error; } int /* error */ xfs_attr_inactive(xfs_inode_t *dp) { xfs_trans_t *trans; xfs_mount_t *mp; int error; mp = dp->i_mount; ASSERT(! XFS_NOT_DQATTACHED(mp, dp)); xfs_ilock(dp, XFS_ILOCK_SHARED); if (!xfs_inode_hasattr(dp) || dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) { xfs_iunlock(dp, XFS_ILOCK_SHARED); return 0; } xfs_iunlock(dp, XFS_ILOCK_SHARED); /* * Start our first transaction of the day. * * All future transactions during this code must be "chained" off * this one via the trans_dup() call. All transactions will contain * the inode, and the inode will always be marked with trans_ihold(). * Since the inode will be locked in all transactions, we must log * the inode in every transaction to let it float upward through * the log. */ trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL); if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ATTRINVAL_LOG_COUNT))) { xfs_trans_cancel(trans, 0); return(error); } xfs_ilock(dp, XFS_ILOCK_EXCL); /* * No need to make quota reservations here. We expect to release some * blocks, not allocate, in the common case. */ xfs_trans_ijoin(trans, dp, 0); /* * Decide on what work routines to call based on the inode size. */ if (!xfs_inode_hasattr(dp) || dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) { error = 0; goto out; } error = xfs_attr_root_inactive(&trans, dp); if (error) goto out; error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0); if (error) goto out; error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES); xfs_iunlock(dp, XFS_ILOCK_EXCL); return(error); out: xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); xfs_iunlock(dp, XFS_ILOCK_EXCL); return(error); } /*======================================================================== * External routines when attribute list is inside the inode *========================================================================*/ /* * Add a name to the shortform attribute list structure * This is the external routine. */ STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args) { int newsize, forkoff, retval; 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_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); ASSERT(bp != NULL); /* * Look up the given attribute in the leaf block. Figure out if * the given flags produce an error or call for an atomic rename. */ retval = xfs_attr_leaf_lookup_int(bp, args); if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { xfs_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); args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */ args->blkno2 = args->blkno; /* set 2nd entry info*/ args->index2 = args->index; args->rmtblkno2 = args->rmtblkno; args->rmtblkcnt2 = args->rmtblkcnt; } /* * Add the attribute to the leaf block, transitioning to a Btree * if required. */ retval = xfs_attr_leaf_add(bp, args); if (retval == ENOSPC) { /* * Promote the attribute list to the Btree format, then * Commit that transaction so that the node_addname() call * can manage its own transactions. */ xfs_bmap_init(args->flist, args->firstblock); error = xfs_attr_leaf_to_node(args); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); return(error); } /* * bmap_finish() may have committed the last trans and started * a new one. We need the inode to be in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 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_attr_leaf_flipflags(args); if (error) return(error); /* * Dismantle the "old" attribute/value pair by removing * a "remote" value (if it exists). */ args->index = args->index2; args->blkno = args->blkno2; args->rmtblkno = args->rmtblkno2; args->rmtblkcnt = args->rmtblkcnt2; if (args->rmtblkno) { error = xfs_attr_rmtval_remove(args); if (error) return(error); } /* * Read in the block containing the "old" attr, then * remove the "old" attr from that block (neat, huh!) */ error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); ASSERT(bp != NULL); (void)xfs_attr_leaf_remove(bp, args); /* * If the result is small enough, shrink it all into the inode. */ if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) { xfs_bmap_init(args->flist, args->firstblock); error = xfs_attr_leaf_to_shortform(bp, args, forkoff); /* bp is gone due to xfs_da_shrink_inode */ if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); return(error); } /* * bmap_finish() may have committed the last trans * and started a new one. We need the inode to be * in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 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_attr_leaf_clearflag(args); } return(error); } /* * Remove a name from the leaf attribute list structure * * This leaf block cannot have a "remote" value, we only call this routine * if bmap_one_block() says there is only one block (ie: no remote blks). */ STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args) { xfs_inode_t *dp; 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_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, XFS_ATTR_FORK); if (error) { return(error); } ASSERT(bp != NULL); error = xfs_attr_leaf_lookup_int(bp, args); if (error == ENOATTR) { xfs_trans_brelse(args->trans, bp); return(error); } (void)xfs_attr_leaf_remove(bp, args); /* * If the result is small enough, shrink it all into the inode. */ if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) { xfs_bmap_init(args->flist, args->firstblock); error = xfs_attr_leaf_to_shortform(bp, args, forkoff); /* bp is gone due to xfs_da_shrink_inode */ if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); return(error); } /* * bmap_finish() may have committed the last trans and started * a new one. We need the inode to be in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 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_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); ASSERT(bp != NULL); error = xfs_attr_leaf_lookup_int(bp, args); if (error != EEXIST) { xfs_trans_brelse(args->trans, bp); return(error); } error = xfs_attr_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); } /* * Copy out attribute entries for attr_list(), for leaf attribute lists. */ STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context) { xfs_attr_leafblock_t *leaf; int error; struct xfs_buf *bp; trace_xfs_attr_leaf_list(context); context->cursor->blkno = 0; error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK); if (error) return XFS_ERROR(error); ASSERT(bp != NULL); leaf = bp->b_addr; if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) { XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW, context->dp->i_mount, leaf); xfs_trans_brelse(NULL, bp); return XFS_ERROR(EFSCORRUPTED); } error = xfs_attr_leaf_list_int(bp, context); xfs_trans_brelse(NULL, bp); return XFS_ERROR(error); } /*======================================================================== * External routines when attribute list size > XFS_LBSIZE(mp). *========================================================================*/ /* * Add a name to a Btree-format attribute list. * * This will involve walking down the Btree, and may involve splitting * leaf nodes and even splitting intermediate nodes up to and including * the root node (a special case of an intermediate node). * * "Remote" attribute values confuse the issue and atomic rename operations * add a whole extra layer of confusion on top of that. */ STATIC int xfs_attr_node_addname(xfs_da_args_t *args) { xfs_da_state_t *state; xfs_da_state_blk_t *blk; xfs_inode_t *dp; xfs_mount_t *mp; int committed, retval, error; 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_da_node_lookup_int(state, &retval); if (error) goto out; blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { goto out; } else if (retval == EEXIST) { if (args->flags & ATTR_CREATE) goto out; trace_xfs_attr_node_replace(args); args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */ args->blkno2 = args->blkno; /* set 2nd entry info*/ args->index2 = args->index; args->rmtblkno2 = args->rmtblkno; args->rmtblkcnt2 = args->rmtblkcnt; args->rmtblkno = 0; args->rmtblkcnt = 0; } retval = xfs_attr_leaf_add(blk->bp, state->args); if (retval == ENOSPC) { if (state->path.active == 1) { /* * Its really a single leaf node, but it had * out-of-line values so it looked like it *might* * have been a b-tree. */ xfs_da_state_free(state); xfs_bmap_init(args->flist, args->firstblock); error = xfs_attr_leaf_to_node(args); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); goto out; } /* * bmap_finish() may have committed the last trans * and started a new one. We need the inode to be * in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 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_da_split(state); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); goto out; } /* * bmap_finish() may have committed the last trans and started * a new one. We need the inode to be in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 0); } else { /* * Addition succeeded, update Btree hashvals. */ xfs_da_fixhashpath(state, &state->path); } /* * Kill the state structure, we're done with it and need to * allow the buffers to come back later. */ xfs_da_state_free(state); state = NULL; /* * Commit the leaf addition or btree split and start the next * trans in the chain. */ error = xfs_trans_roll(&args->trans, dp); if (error) goto out; /* * If there was an out-of-line value, allocate the blocks we * identified for its storage and copy the value. This is done * after we create the attribute so that we don't overflow the * maximum size of a transaction and/or hit a deadlock. */ if (args->rmtblkno > 0) { error = xfs_attr_rmtval_set(args); if (error) return(error); } /* * If this is an atomic rename operation, we must "flip" the * incomplete flags on the "new" and "old" attribute/value pairs * so that one disappears and one appears atomically. Then we * must remove the "old" attribute/value pair. */ if (args->op_flags & XFS_DA_OP_RENAME) { /* * In a separate transaction, set the incomplete flag on the * "old" attr and clear the incomplete flag on the "new" attr. */ error = xfs_attr_leaf_flipflags(args); if (error) goto out; /* * Dismantle the "old" attribute/value pair by removing * a "remote" value (if it exists). */ args->index = args->index2; args->blkno = args->blkno2; args->rmtblkno = args->rmtblkno2; args->rmtblkcnt = args->rmtblkcnt2; if (args->rmtblkno) { error = xfs_attr_rmtval_remove(args); if (error) return(error); } /* * Re-find the "old" attribute entry after any split ops. * The INCOMPLETE flag means that we will find the "old" * attr, not the "new" one. */ args->flags |= XFS_ATTR_INCOMPLETE; state = xfs_da_state_alloc(); state->args = args; state->mp = mp; state->blocksize = state->mp->m_sb.sb_blocksize; state->node_ents = state->mp->m_attr_node_ents; state->inleaf = 0; error = xfs_da_node_lookup_int(state, &retval); if (error) goto out; /* * Remove the name and update the hashvals in the tree. */ blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); error = xfs_attr_leaf_remove(blk->bp, args); xfs_da_fixhashpath(state, &state->path); /* * Check to see if the tree needs to be collapsed. */ if (retval && (state->path.active > 1)) { xfs_bmap_init(args->flist, args->firstblock); error = xfs_da_join(state); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); goto out; } /* * bmap_finish() may have committed the last trans * and started a new one. We need the inode to be * in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 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_attr_leaf_clearflag(args); if (error) goto out; } retval = error = 0; out: if (state) xfs_da_state_free(state); if (error) return(error); return(retval); } /* * Remove a name from a B-tree attribute list. * * This will involve walking down the Btree, and may involve joining * leaf nodes and even joining intermediate nodes up to and including * the root node (a special case of an intermediate node). */ STATIC int xfs_attr_node_removename(xfs_da_args_t *args) { xfs_da_state_t *state; xfs_da_state_blk_t *blk; xfs_inode_t *dp; 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_da_node_lookup_int(state, &retval); if (error || (retval != EEXIST)) { if (error == 0) error = retval; goto out; } /* * If there is an out-of-line value, de-allocate the blocks. * This is done before we remove the attribute so that we don't * overflow the maximum size of a transaction and/or hit a deadlock. */ blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->bp != NULL); ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); if (args->rmtblkno > 0) { /* * Fill in disk block numbers in the state structure * so that we can get the buffers back after we commit * several transactions in the following calls. */ error = xfs_attr_fillstate(state); if (error) goto out; /* * Mark the attribute as INCOMPLETE, then bunmapi() the * remote value. */ error = xfs_attr_leaf_setflag(args); if (error) goto out; error = xfs_attr_rmtval_remove(args); if (error) goto out; /* * Refill the state structure with buffers, the prior calls * released our buffers. */ error = xfs_attr_refillstate(state); if (error) goto out; } /* * Remove the name and update the hashvals in the tree. */ blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); retval = xfs_attr_leaf_remove(blk->bp, args); xfs_da_fixhashpath(state, &state->path); /* * Check to see if the tree needs to be collapsed. */ if (retval && (state->path.active > 1)) { xfs_bmap_init(args->flist, args->firstblock); error = xfs_da_join(state); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); goto out; } /* * bmap_finish() may have committed the last trans and started * a new one. We need the inode to be in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 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_da_read_buf(args->trans, args->dp, 0, -1, &bp, XFS_ATTR_FORK); if (error) goto out; ASSERT((((xfs_attr_leafblock_t *)bp->b_addr)->hdr.info.magic) == cpu_to_be16(XFS_ATTR_LEAF_MAGIC)); if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) { xfs_bmap_init(args->flist, args->firstblock); error = xfs_attr_leaf_to_shortform(bp, args, forkoff); /* bp is gone due to xfs_da_shrink_inode */ if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); goto out; } /* * bmap_finish() may have committed the last trans * and started a new one. We need the inode to be * in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 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_da_read_buf(state->args->trans, state->args->dp, blk->blkno, blk->disk_blkno, &blk->bp, XFS_ATTR_FORK); if (error) return(error); } else { blk->bp = NULL; } } /* * Roll down the "altpath" in the state structure, storing the on-disk * block number for those buffers in the "altpath". */ path = &state->altpath; ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH)); for (blk = path->blk, level = 0; level < path->active; blk++, level++) { if (blk->disk_blkno) { error = xfs_da_read_buf(state->args->trans, state->args->dp, blk->blkno, blk->disk_blkno, &blk->bp, XFS_ATTR_FORK); if (error) return(error); } else { blk->bp = NULL; } } return(0); } /* * Look up a filename in a node attribute list. * * This routine gets called for any attribute fork that has more than one * block, ie: both true Btree attr lists and for single-leaf-blocks with * "remote" values taking up more blocks. */ STATIC int xfs_attr_node_get(xfs_da_args_t *args) { xfs_da_state_t *state; xfs_da_state_blk_t *blk; int error, retval; int i; 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_da_node_lookup_int(state, &retval); if (error) { retval = error; } else if (retval == EEXIST) { blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->bp != NULL); ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); /* * Get the value, local or "remote" */ retval = xfs_attr_leaf_getvalue(blk->bp, args); if (!retval && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) { retval = xfs_attr_rmtval_get(args); } } /* * If not in a transaction, we have to release all the buffers. */ for (i = 0; i < state->path.active; i++) { xfs_trans_brelse(args->trans, state->path.blk[i].bp); state->path.blk[i].bp = NULL; } xfs_da_state_free(state); return(retval); } STATIC int /* error */ xfs_attr_node_list(xfs_attr_list_context_t *context) { attrlist_cursor_kern_t *cursor; xfs_attr_leafblock_t *leaf; xfs_da_intnode_t *node; xfs_da_node_entry_t *btree; int error, i; struct xfs_buf *bp; trace_xfs_attr_node_list(context); cursor = context->cursor; cursor->initted = 1; /* * Do all sorts of validation on the passed-in cursor structure. * If anything is amiss, ignore the cursor and look up the hashval * starting from the btree root. */ bp = NULL; if (cursor->blkno > 0) { error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1, &bp, XFS_ATTR_FORK); if ((error != 0) && (error != EFSCORRUPTED)) return(error); if (bp) { node = bp->b_addr; switch (be16_to_cpu(node->hdr.info.magic)) { case XFS_DA_NODE_MAGIC: trace_xfs_attr_list_wrong_blk(context); xfs_trans_brelse(NULL, bp); bp = NULL; break; case XFS_ATTR_LEAF_MAGIC: leaf = bp->b_addr; if (cursor->hashval > be32_to_cpu(leaf->entries[ be16_to_cpu(leaf->hdr.count)-1].hashval)) { trace_xfs_attr_list_wrong_blk(context); xfs_trans_brelse(NULL, bp); bp = NULL; } else if (cursor->hashval <= be32_to_cpu(leaf->entries[0].hashval)) { trace_xfs_attr_list_wrong_blk(context); xfs_trans_brelse(NULL, bp); bp = NULL; } break; default: trace_xfs_attr_list_wrong_blk(context); xfs_trans_brelse(NULL, bp); bp = NULL; } } } /* * We did not find what we expected given the cursor's contents, * so we start from the top and work down based on the hash value. * Note that start of node block is same as start of leaf block. */ if (bp == NULL) { cursor->blkno = 0; for (;;) { error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); if (unlikely(bp == NULL)) { XFS_ERROR_REPORT("xfs_attr_node_list(2)", XFS_ERRLEVEL_LOW, context->dp->i_mount); return(XFS_ERROR(EFSCORRUPTED)); } node = bp->b_addr; if (node->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC)) break; if (unlikely(node->hdr.info.magic != cpu_to_be16(XFS_DA_NODE_MAGIC))) { XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)", XFS_ERRLEVEL_LOW, context->dp->i_mount, node); xfs_trans_brelse(NULL, bp); return(XFS_ERROR(EFSCORRUPTED)); } btree = node->btree; for (i = 0; i < be16_to_cpu(node->hdr.count); btree++, i++) { if (cursor->hashval <= be32_to_cpu(btree->hashval)) { cursor->blkno = be32_to_cpu(btree->before); trace_xfs_attr_list_node_descend(context, btree); break; } } if (i == be16_to_cpu(node->hdr.count)) { xfs_trans_brelse(NULL, bp); return(0); } xfs_trans_brelse(NULL, bp); } } ASSERT(bp != NULL); /* * Roll upward through the blocks, processing each leaf block in * order. As long as there is space in the result buffer, keep * adding the information. */ for (;;) { leaf = bp->b_addr; if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) { XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)", XFS_ERRLEVEL_LOW, context->dp->i_mount, leaf); xfs_trans_brelse(NULL, bp); return(XFS_ERROR(EFSCORRUPTED)); } error = xfs_attr_leaf_list_int(bp, context); if (error) { xfs_trans_brelse(NULL, bp); return error; } if (context->seen_enough || leaf->hdr.info.forw == 0) break; cursor->blkno = be32_to_cpu(leaf->hdr.info.forw); xfs_trans_brelse(NULL, bp); error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); if (unlikely((bp == NULL))) { XFS_ERROR_REPORT("xfs_attr_node_list(5)", XFS_ERRLEVEL_LOW, context->dp->i_mount); return(XFS_ERROR(EFSCORRUPTED)); } } xfs_trans_brelse(NULL, bp); return(0); } /*======================================================================== * External routines for manipulating out-of-line attribute values. *========================================================================*/ /* * Read the value associated with an attribute from the out-of-line buffer * that we stored it in. */ int xfs_attr_rmtval_get(xfs_da_args_t *args) { xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE]; xfs_mount_t *mp; xfs_daddr_t dblkno; void *dst; xfs_buf_t *bp; int nmap, error, tmp, valuelen, blkcnt, i; xfs_dablk_t lblkno; trace_xfs_attr_rmtval_get(args); ASSERT(!(args->flags & ATTR_KERNOVAL)); mp = args->dp->i_mount; dst = args->value; valuelen = args->valuelen; lblkno = args->rmtblkno; while (valuelen > 0) { nmap = ATTR_RMTVALUE_MAPSIZE; error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, args->rmtblkcnt, map, &nmap, XFS_BMAPI_ATTRFORK); if (error) return(error); ASSERT(nmap >= 1); for (i = 0; (i < nmap) && (valuelen > 0); i++) { ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && (map[i].br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dblkno, blkcnt, 0, &bp); if (error) return(error); tmp = min_t(int, valuelen, BBTOB(bp->b_length)); xfs_buf_iomove(bp, 0, tmp, dst, XBRW_READ); xfs_buf_relse(bp); dst += tmp; valuelen -= tmp; lblkno += map[i].br_blockcount; } } ASSERT(valuelen == 0); return(0); } /* * Write the value associated with an attribute into the out-of-line buffer * that we have defined for it. */ STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args) { xfs_mount_t *mp; xfs_fileoff_t lfileoff; xfs_inode_t *dp; xfs_bmbt_irec_t map; xfs_daddr_t dblkno; void *src; xfs_buf_t *bp; xfs_dablk_t lblkno; int blkcnt, valuelen, nmap, error, tmp, committed; trace_xfs_attr_rmtval_set(args); dp = args->dp; mp = dp->i_mount; src = args->value; /* * Find a "hole" in the attribute address space large enough for * us to drop the new attribute's value into. */ blkcnt = XFS_B_TO_FSB(mp, args->valuelen); lfileoff = 0; error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, XFS_ATTR_FORK); if (error) { return(error); } args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff; args->rmtblkcnt = blkcnt; /* * Roll through the "value", allocating blocks on disk as required. */ while (blkcnt > 0) { /* * Allocate a single extent, up to the size of the value. */ xfs_bmap_init(args->flist, args->firstblock); nmap = 1; error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno, blkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, args->firstblock, args->total, &map, &nmap, args->flist); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); return(error); } /* * bmap_finish() may have committed the last trans and started * a new one. We need the inode to be in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, dp, 0); ASSERT(nmap == 1); ASSERT((map.br_startblock != DELAYSTARTBLOCK) && (map.br_startblock != HOLESTARTBLOCK)); lblkno += map.br_blockcount; blkcnt -= map.br_blockcount; /* * Start the next trans in the chain. */ error = xfs_trans_roll(&args->trans, dp); if (error) return (error); } /* * Roll through the "value", copying the attribute value to the * already-allocated blocks. Blocks are written synchronously * so that we can know they are all on disk before we turn off * the INCOMPLETE flag. */ lblkno = args->rmtblkno; valuelen = args->valuelen; while (valuelen > 0) { int buflen; /* * Try to remember where we decided to put the value. */ xfs_bmap_init(args->flist, args->firstblock); nmap = 1; error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno, args->rmtblkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); if (error) return(error); ASSERT(nmap == 1); ASSERT((map.br_startblock != DELAYSTARTBLOCK) && (map.br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt, 0); if (!bp) return ENOMEM; buflen = BBTOB(bp->b_length); tmp = min_t(int, valuelen, buflen); xfs_buf_iomove(bp, 0, tmp, src, XBRW_WRITE); if (tmp < buflen) xfs_buf_zero(bp, tmp, buflen - tmp); error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */ xfs_buf_relse(bp); if (error) return error; src += tmp; valuelen -= tmp; lblkno += map.br_blockcount; } ASSERT(valuelen == 0); return(0); } /* * Remove the value associated with an attribute by deleting the * out-of-line buffer that it is stored on. */ STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args) { xfs_mount_t *mp; xfs_bmbt_irec_t map; xfs_buf_t *bp; xfs_daddr_t dblkno; xfs_dablk_t lblkno; int valuelen, blkcnt, nmap, error, done, committed; trace_xfs_attr_rmtval_remove(args); mp = args->dp->i_mount; /* * Roll through the "value", invalidating the attribute value's * blocks. */ lblkno = args->rmtblkno; valuelen = args->rmtblkcnt; while (valuelen > 0) { /* * Try to remember where we decided to put the value. */ nmap = 1; error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno, args->rmtblkcnt, &map, &nmap, XFS_BMAPI_ATTRFORK); if (error) return(error); ASSERT(nmap == 1); ASSERT((map.br_startblock != DELAYSTARTBLOCK) && (map.br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); /* * If the "remote" value is in the cache, remove it. */ bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt, XBF_TRYLOCK); if (bp) { xfs_buf_stale(bp); xfs_buf_relse(bp); bp = NULL; } valuelen -= map.br_blockcount; lblkno += map.br_blockcount; } /* * Keep de-allocating extents until the remote-value region is gone. */ lblkno = args->rmtblkno; blkcnt = args->rmtblkcnt; done = 0; while (!done) { xfs_bmap_init(args->flist, args->firstblock); error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, 1, args->firstblock, args->flist, &done); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, &committed); } if (error) { ASSERT(committed); args->trans = NULL; xfs_bmap_cancel(args->flist); return(error); } /* * bmap_finish() may have committed the last trans and started * a new one. We need the inode to be in all transactions. */ if (committed) xfs_trans_ijoin(args->trans, args->dp, 0); /* * Close out trans and start the next one in the chain. */ error = xfs_trans_roll(&args->trans, args->dp); if (error) return (error); } return(0); }