/* * 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 <linux/capability.h> #include "xfs.h" #include "xfs_fs.h" #include "xfs_types.h" #include "xfs_bit.h" #include "xfs_log.h" #include "xfs_inum.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_dir2.h" #include "xfs_dmapi.h" #include "xfs_mount.h" #include "xfs_da_btree.h" #include "xfs_bmap_btree.h" #include "xfs_alloc_btree.h" #include "xfs_ialloc_btree.h" #include "xfs_dir2_sf.h" #include "xfs_attr_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_alloc.h" #include "xfs_btree.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_acl.h" #include "xfs_rw.h" /* * xfs_attr.c * * Provide the external interfaces to manage attribute lists. */ #define ATTR_SYSCOUNT 2 STATIC struct attrnames posix_acl_access; STATIC struct attrnames posix_acl_default; STATIC struct attrnames *attr_system_names[ATTR_SYSCOUNT]; /*======================================================================== * 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 */ #if defined(XFS_ATTR_TRACE) ktrace_t *xfs_attr_trace_buf; #endif /*======================================================================== * Overall external interface routines. *========================================================================*/ int xfs_attr_fetch(xfs_inode_t *ip, const char *name, int namelen, char *value, int *valuelenp, int flags, struct cred *cred) { xfs_da_args_t args; int error; if ((XFS_IFORK_Q(ip) == 0) || (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && ip->i_d.di_anextents == 0)) return(ENOATTR); /* * Fill in the arg structure for this request. */ memset((char *)&args, 0, sizeof(args)); args.name = name; args.namelen = namelen; 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 (XFS_IFORK_Q(ip) == 0 || (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && ip->i_d.di_anextents == 0)) { error = XFS_ERROR(ENOATTR); } else 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(bhv_desc_t *bdp, const char *name, char *value, int *valuelenp, int flags, struct cred *cred) { xfs_inode_t *ip = XFS_BHVTOI(bdp); int error, namelen; XFS_STATS_INC(xs_attr_get); if (!name) return(EINVAL); namelen = strlen(name); if (namelen >= MAXNAMELEN) return(EFAULT); /* match IRIX behaviour */ if (XFS_FORCED_SHUTDOWN(ip->i_mount)) return(EIO); xfs_ilock(ip, XFS_ILOCK_SHARED); error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred); xfs_iunlock(ip, XFS_ILOCK_SHARED); return(error); } int xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen, char *value, int valuelen, int flags) { xfs_da_args_t args; xfs_fsblock_t firstblock; xfs_bmap_free_t flist; int error, err2, committed; int local, size; uint nblks; xfs_mount_t *mp = dp->i_mount; int rsvd = (flags & ATTR_ROOT) != 0; /* * Attach the dquots to the inode. */ if ((error = XFS_QM_DQATTACH(mp, dp, 0))) return (error); /* * 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); /* * 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) { if ((error = xfs_bmap_add_attrfork(dp, size, rsvd))) return(error); } /* * Fill in the arg structure for this request. */ memset((char *)&args, 0, sizeof(args)); args.name = name; args.namelen = namelen; 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.addname = 1; args.oknoent = 1; nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK); if (local) { if (size > (mp->m_sb.sb_blocksize >> 1)) { /* Double split possible */ nblks <<= 1; } } else { uint dblocks = XFS_B_TO_FSB(mp, valuelen); /* Out of line attribute, cannot double split, but make * room for the attribute value itself. */ nblks += dblocks; nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK); } /* Size is now blocks for attribute data */ args.total = nblks; /* * 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, (uint) nblks, XFS_ATTRSET_LOG_RES(mp, nblks), 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(mp, args.trans, dp, nblks, 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, XFS_ILOCK_EXCL); xfs_trans_ihold(args.trans, dp); /* * 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); } err2 = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES, NULL); xfs_iunlock(dp, XFS_ILOCK_EXCL); /* * Hit the inode change time. */ if (!error && (flags & ATTR_KERNOTIME) == 0) { xfs_ichgtime(dp, XFS_ICHGTIME_CHG); } 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, *args.firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args.trans, dp); } /* * Commit the leaf transformation. We'll need another (linked) * transaction to add the new attribute to the leaf. */ if ((error = xfs_attr_rolltrans(&args.trans, dp))) 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); } /* * 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, NULL); xfs_iunlock(dp, XFS_ILOCK_EXCL); /* * Hit the inode change time. */ if (!error && (flags & ATTR_KERNOTIME) == 0) { xfs_ichgtime(dp, XFS_ICHGTIME_CHG); } 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(bhv_desc_t *bdp, const char *name, char *value, int valuelen, int flags, struct cred *cred) { xfs_inode_t *dp; int namelen; namelen = strlen(name); if (namelen >= MAXNAMELEN) return EFAULT; /* match IRIX behaviour */ XFS_STATS_INC(xs_attr_set); dp = XFS_BHVTOI(bdp); if (XFS_FORCED_SHUTDOWN(dp->i_mount)) return (EIO); return xfs_attr_set_int(dp, name, namelen, value, valuelen, flags); } /* * Generic handler routine to remove a name from an attribute list. * Transitions attribute list from Btree to shortform as necessary. */ int xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, 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; args.namelen = namelen; 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; /* * Attach the dquots to the inode. */ if ((error = XFS_QM_DQATTACH(mp, dp, 0))) 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, XFS_ILOCK_EXCL); xfs_trans_ihold(args.trans, dp); /* * Decide on what work routines to call based on the inode size. */ if (XFS_IFORK_Q(dp) == 0 || (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && dp->i_d.di_anextents == 0)) { 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); } /* * 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, NULL); xfs_iunlock(dp, XFS_ILOCK_EXCL); /* * Hit the inode change time. */ if (!error && (flags & ATTR_KERNOTIME) == 0) { xfs_ichgtime(dp, XFS_ICHGTIME_CHG); } 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(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred) { xfs_inode_t *dp; int namelen; namelen = strlen(name); if (namelen >= MAXNAMELEN) return EFAULT; /* match IRIX behaviour */ XFS_STATS_INC(xs_attr_remove); dp = XFS_BHVTOI(bdp); if (XFS_FORCED_SHUTDOWN(dp->i_mount)) return (EIO); xfs_ilock(dp, XFS_ILOCK_SHARED); if (XFS_IFORK_Q(dp) == 0 || (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && dp->i_d.di_anextents == 0)) { xfs_iunlock(dp, XFS_ILOCK_SHARED); return(XFS_ERROR(ENOATTR)); } xfs_iunlock(dp, XFS_ILOCK_SHARED); return xfs_attr_remove_int(dp, name, namelen, flags); } int /* error */ xfs_attr_list_int(xfs_attr_list_context_t *context) { int error; xfs_inode_t *dp = context->dp; /* * Decide on what work routines to call based on the inode size. */ if (XFS_IFORK_Q(dp) == 0 || (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && dp->i_d.di_anextents == 0)) { 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); } 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, attrnames_t *namesp, char *name, int namelen, int valuelen, char *value) { 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(*context->alist)); ASSERT(context->firstu <= context->bufsize); arraytop = sizeof(*context->alist) + context->count * sizeof(context->alist->al_offset[0]); context->firstu -= ATTR_ENTSIZE(namelen); if (context->firstu < arraytop) { xfs_attr_trace_l_c("buffer full", context); context->alist->al_more = 1; context->seen_enough = 1; return 1; } aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]); aep->a_valuelen = valuelen; memcpy(aep->a_name, name, namelen); aep->a_name[ namelen ] = 0; context->alist->al_offset[ context->count++ ] = context->firstu; context->alist->al_count = context->count; xfs_attr_trace_l_c("add", context); return 0; } STATIC int xfs_attr_kern_list(xfs_attr_list_context_t *context, attrnames_t *namesp, char *name, int namelen, int valuelen, char *value) { char *offset; int arraytop; ASSERT(context->count >= 0); arraytop = context->count + namesp->attr_namelen + namelen + 1; if (arraytop > context->firstu) { context->count = -1; /* insufficient space */ return 1; } offset = (char *)context->alist + context->count; strncpy(offset, namesp->attr_name, namesp->attr_namelen); offset += namesp->attr_namelen; strncpy(offset, name, namelen); /* real name */ offset += namelen; *offset = '\0'; context->count += namesp->attr_namelen + namelen + 1; return 0; } /*ARGSUSED*/ STATIC int xfs_attr_kern_list_sizes(xfs_attr_list_context_t *context, attrnames_t *namesp, char *name, int namelen, int valuelen, char *value) { context->count += namesp->attr_namelen + namelen + 1; 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(bhv_desc_t *bdp, char *buffer, int bufsize, int flags, attrlist_cursor_kern_t *cursor, struct cred *cred) { xfs_attr_list_context_t context; xfs_inode_t *dp; int error; XFS_STATS_INC(xs_attr_list); /* * 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. */ context.dp = dp = XFS_BHVTOI(bdp); context.cursor = cursor; context.count = 0; context.dupcnt = 0; context.resynch = 1; context.flags = flags; context.seen_enough = 0; context.alist = (attrlist_t *)buffer; context.put_value = 0; if (flags & ATTR_KERNAMELS) { context.bufsize = bufsize; context.firstu = context.bufsize; if (flags & ATTR_KERNOVAL) context.put_listent = xfs_attr_kern_list_sizes; else context.put_listent = xfs_attr_kern_list; } else { context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */ context.firstu = context.bufsize; context.alist->al_count = 0; context.alist->al_more = 0; context.alist->al_offset[0] = context.bufsize; context.put_listent = xfs_attr_put_listent; } if (XFS_FORCED_SHUTDOWN(dp->i_mount)) return EIO; xfs_ilock(dp, XFS_ILOCK_SHARED); xfs_attr_trace_l_c("syscall start", &context); error = xfs_attr_list_int(&context); xfs_iunlock(dp, XFS_ILOCK_SHARED); xfs_attr_trace_l_c("syscall end", &context); if (context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS)) { /* must return negated buffer size or the error */ if (context.count < 0) error = XFS_ERROR(ERANGE); else error = -context.count; } else 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_IFORK_Q(dp) == 0) || (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) || (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && dp->i_d.di_anextents == 0)) { 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, XFS_ILOCK_EXCL); xfs_trans_ihold(trans, dp); /* * Decide on what work routines to call based on the inode size. */ if ((XFS_IFORK_Q(dp) == 0) || (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) || (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS && dp->i_d.di_anextents == 0)) { error = 0; goto out; } error = xfs_attr_root_inactive(&trans, dp); if (error) goto out; /* * signal synchronous inactive transactions unless this * is a synchronous mount filesystem in which case we * know that we're here because we've been called out of * xfs_inactive which means that the last reference is gone * and the unlink transaction has already hit the disk so * async inactive transactions are safe. */ if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK, (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0)))) goto out; /* * Commit the last in the sequence of transactions. */ xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE); error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES, NULL); xfs_iunlock(dp, XFS_ILOCK_EXCL); return(error); out: xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); xfs_iunlock(dp, XFS_ILOCK_EXCL); return(error); } /*======================================================================== * External routines when attribute list is inside the inode *========================================================================*/ /* * Add a name to the shortform attribute list structure * This is the external routine. */ STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args) { int newsize, forkoff, retval; retval = xfs_attr_shortform_lookup(args); if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { return(retval); } else if (retval == EEXIST) { if (args->flags & ATTR_CREATE) return(retval); retval = xfs_attr_shortform_remove(args); ASSERT(retval == 0); } if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX || args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX) return(XFS_ERROR(ENOSPC)); newsize = XFS_ATTR_SF_TOTSIZE(args->dp); newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen); forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize); if (!forkoff) return(XFS_ERROR(ENOSPC)); xfs_attr_shortform_add(args, forkoff); return(0); } /*======================================================================== * External routines when attribute list is one block *========================================================================*/ /* * Add a name to the leaf attribute list structure * * This leaf block cannot have a "remote" value, we only call this routine * if bmap_one_block() says there is only one block (ie: no remote blks). */ int xfs_attr_leaf_addname(xfs_da_args_t *args) { xfs_inode_t *dp; xfs_dabuf_t *bp; int retval, error, committed, forkoff; /* * Read the (only) block in the attribute list in. */ dp = args->dp; args->blkno = 0; error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); ASSERT(bp != NULL); /* * Look up the given attribute in the leaf block. Figure out if * the given flags produce an error or call for an atomic rename. */ retval = xfs_attr_leaf_lookup_int(bp, args); if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { xfs_da_brelse(args->trans, bp); return(retval); } else if (retval == EEXIST) { if (args->flags & ATTR_CREATE) { /* pure create op */ xfs_da_brelse(args->trans, bp); return(retval); } args->rename = 1; /* an atomic rename */ args->blkno2 = args->blkno; /* set 2nd entry info*/ args->index2 = args->index; args->rmtblkno2 = args->rmtblkno; args->rmtblkcnt2 = args->rmtblkcnt; } /* * Add the attribute to the leaf block, transitioning to a Btree * if required. */ retval = xfs_attr_leaf_add(bp, args); xfs_da_buf_done(bp); if (retval == ENOSPC) { /* * Promote the attribute list to the Btree format, then * Commit that transaction so that the node_addname() call * can manage its own transactions. */ XFS_BMAP_INIT(args->flist, args->firstblock); error = xfs_attr_leaf_to_node(args); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } /* * Commit the current trans (including the inode) and start * a new one. */ if ((error = xfs_attr_rolltrans(&args->trans, dp))) 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. */ if ((error = xfs_attr_rolltrans(&args->trans, dp))) 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->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, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } } else xfs_da_buf_done(bp); /* * Commit the remove and start the next trans in series. */ error = xfs_attr_rolltrans(&args->trans, dp); } else if (args->rmtblkno > 0) { /* * Added a "remote" value, just clear the incomplete flag. */ error = xfs_attr_leaf_clearflag(args); } return(error); } /* * Remove a name from the leaf attribute list structure * * This leaf block cannot have a "remote" value, we only call this routine * if bmap_one_block() says there is only one block (ie: no remote blks). */ STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args) { xfs_inode_t *dp; xfs_dabuf_t *bp; int error, committed, forkoff; /* * Remove the attribute. */ dp = args->dp; args->blkno = 0; error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, XFS_ATTR_FORK); if (error) { return(error); } ASSERT(bp != NULL); error = xfs_attr_leaf_lookup_int(bp, args); if (error == ENOATTR) { xfs_da_brelse(args->trans, bp); return(error); } (void)xfs_attr_leaf_remove(bp, args); /* * If the result is small enough, shrink it all into the inode. */ if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) { XFS_BMAP_INIT(args->flist, args->firstblock); error = xfs_attr_leaf_to_shortform(bp, args, forkoff); /* bp is gone due to xfs_da_shrink_inode */ if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } } else xfs_da_buf_done(bp); return(0); } /* * Look up a name in a leaf attribute list structure. * * This leaf block cannot have a "remote" value, we only call this routine * if bmap_one_block() says there is only one block (ie: no remote blks). */ STATIC int xfs_attr_leaf_get(xfs_da_args_t *args) { xfs_dabuf_t *bp; int error; args->blkno = 0; error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); ASSERT(bp != NULL); error = xfs_attr_leaf_lookup_int(bp, args); if (error != EEXIST) { xfs_da_brelse(args->trans, bp); return(error); } error = xfs_attr_leaf_getvalue(bp, args); xfs_da_brelse(args->trans, bp); if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) { error = xfs_attr_rmtval_get(args); } return(error); } /* * Copy out attribute entries for attr_list(), for leaf attribute lists. */ STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context) { xfs_attr_leafblock_t *leaf; int error; xfs_dabuf_t *bp; context->cursor->blkno = 0; error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK); if (error) return XFS_ERROR(error); ASSERT(bp != NULL); leaf = bp->data; if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) { XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW, context->dp->i_mount, leaf); xfs_da_brelse(NULL, bp); return XFS_ERROR(EFSCORRUPTED); } error = xfs_attr_leaf_list_int(bp, context); xfs_da_brelse(NULL, bp); return XFS_ERROR(error); } /*======================================================================== * External routines when attribute list size > XFS_LBSIZE(mp). *========================================================================*/ /* * Add a name to a Btree-format attribute list. * * This will involve walking down the Btree, and may involve splitting * leaf nodes and even splitting intermediate nodes up to and including * the root node (a special case of an intermediate node). * * "Remote" attribute values confuse the issue and atomic rename operations * add a whole extra layer of confusion on top of that. */ STATIC int xfs_attr_node_addname(xfs_da_args_t *args) { xfs_da_state_t *state; xfs_da_state_blk_t *blk; xfs_inode_t *dp; xfs_mount_t *mp; int committed, retval, error; /* * Fill in bucket of arguments/results/context to carry around. */ dp = args->dp; mp = dp->i_mount; restart: state = xfs_da_state_alloc(); state->args = args; state->mp = mp; state->blocksize = state->mp->m_sb.sb_blocksize; state->node_ents = state->mp->m_attr_node_ents; /* * Search to see if name already exists, and get back a pointer * to where it should go. */ error = xfs_da_node_lookup_int(state, &retval); if (error) goto out; blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) { goto out; } else if (retval == EEXIST) { if (args->flags & ATTR_CREATE) goto out; args->rename = 1; /* 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, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } /* * Commit the node conversion and start the next * trans in the chain. */ if ((error = xfs_attr_rolltrans(&args->trans, dp))) 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, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } } else { /* * Addition succeeded, update Btree hashvals. */ xfs_da_fixhashpath(state, &state->path); } /* * Kill the state structure, we're done with it and need to * allow the buffers to come back later. */ xfs_da_state_free(state); state = NULL; /* * Commit the leaf addition or btree split and start the next * trans in the chain. */ if ((error = xfs_attr_rolltrans(&args->trans, dp))) 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->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, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } } /* * Commit and start the next trans in the chain. */ if ((error = xfs_attr_rolltrans(&args->trans, dp))) goto out; } else if (args->rmtblkno > 0) { /* * Added a "remote" value, just clear the incomplete flag. */ error = xfs_attr_leaf_clearflag(args); if (error) goto out; } retval = error = 0; out: if (state) xfs_da_state_free(state); if (error) return(error); return(retval); } /* * Remove a name from a B-tree attribute list. * * This will involve walking down the Btree, and may involve joining * leaf nodes and even joining intermediate nodes up to and including * the root node (a special case of an intermediate node). */ STATIC int xfs_attr_node_removename(xfs_da_args_t *args) { xfs_da_state_t *state; xfs_da_state_blk_t *blk; xfs_inode_t *dp; xfs_dabuf_t *bp; int retval, error, committed, forkoff; /* * Tie a string around our finger to remind us where we are. */ dp = args->dp; state = xfs_da_state_alloc(); state->args = args; state->mp = dp->i_mount; state->blocksize = state->mp->m_sb.sb_blocksize; state->node_ents = state->mp->m_attr_node_ents; /* * Search to see if name exists, and get back a pointer to it. */ error = xfs_da_node_lookup_int(state, &retval); if (error || (retval != EEXIST)) { if (error == 0) error = retval; goto out; } /* * If there is an out-of-line value, de-allocate the blocks. * This is done before we remove the attribute so that we don't * overflow the maximum size of a transaction and/or hit a deadlock. */ blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->bp != NULL); ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); if (args->rmtblkno > 0) { /* * Fill in disk block numbers in the state structure * so that we can get the buffers back after we commit * several transactions in the following calls. */ error = xfs_attr_fillstate(state); if (error) goto out; /* * Mark the attribute as INCOMPLETE, then bunmapi() the * remote value. */ error = xfs_attr_leaf_setflag(args); if (error) goto out; error = xfs_attr_rmtval_remove(args); if (error) goto out; /* * Refill the state structure with buffers, the prior calls * released our buffers. */ error = xfs_attr_refillstate(state); if (error) goto out; } /* * Remove the name and update the hashvals in the tree. */ blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); retval = xfs_attr_leaf_remove(blk->bp, args); xfs_da_fixhashpath(state, &state->path); /* * Check to see if the tree needs to be collapsed. */ if (retval && (state->path.active > 1)) { XFS_BMAP_INIT(args->flist, args->firstblock); error = xfs_da_join(state); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } /* * Commit the Btree join operation and start a new trans. */ if ((error = xfs_attr_rolltrans(&args->trans, dp))) goto out; } /* * If the result is small enough, push it all into the inode. */ if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) { /* * Have to get rid of the copy of this dabuf in the state. */ ASSERT(state->path.active == 1); ASSERT(state->path.blk[0].bp); xfs_da_buf_done(state->path.blk[0].bp); state->path.blk[0].bp = NULL; error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp, XFS_ATTR_FORK); if (error) goto out; ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *) bp->data)->hdr.info.magic) == 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, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } } else xfs_da_brelse(args->trans, bp); } error = 0; out: xfs_da_state_free(state); return(error); } /* * Fill in the disk block numbers in the state structure for the buffers * that are attached to the state structure. * This is done so that we can quickly reattach ourselves to those buffers * after some set of transaction commits have released these buffers. */ STATIC int xfs_attr_fillstate(xfs_da_state_t *state) { xfs_da_state_path_t *path; xfs_da_state_blk_t *blk; int level; /* * Roll down the "path" in the state structure, storing the on-disk * block number for those buffers in the "path". */ path = &state->path; ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH)); for (blk = path->blk, level = 0; level < path->active; blk++, level++) { if (blk->bp) { blk->disk_blkno = xfs_da_blkno(blk->bp); xfs_da_buf_done(blk->bp); blk->bp = NULL; } else { blk->disk_blkno = 0; } } /* * Roll down the "altpath" in the state structure, storing the on-disk * block number for those buffers in the "altpath". */ path = &state->altpath; ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH)); for (blk = path->blk, level = 0; level < path->active; blk++, level++) { if (blk->bp) { blk->disk_blkno = xfs_da_blkno(blk->bp); xfs_da_buf_done(blk->bp); blk->bp = NULL; } else { blk->disk_blkno = 0; } } return(0); } /* * Reattach the buffers to the state structure based on the disk block * numbers stored in the state structure. * This is done after some set of transaction commits have released those * buffers from our grip. */ STATIC int xfs_attr_refillstate(xfs_da_state_t *state) { xfs_da_state_path_t *path; xfs_da_state_blk_t *blk; int level, error; /* * Roll down the "path" in the state structure, storing the on-disk * block number for those buffers in the "path". */ path = &state->path; ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH)); for (blk = path->blk, level = 0; level < path->active; blk++, level++) { if (blk->disk_blkno) { error = xfs_da_read_buf(state->args->trans, state->args->dp, blk->blkno, blk->disk_blkno, &blk->bp, XFS_ATTR_FORK); if (error) return(error); } else { blk->bp = NULL; } } /* * Roll down the "altpath" in the state structure, storing the on-disk * block number for those buffers in the "altpath". */ path = &state->altpath; ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH)); for (blk = path->blk, level = 0; level < path->active; blk++, level++) { if (blk->disk_blkno) { error = xfs_da_read_buf(state->args->trans, state->args->dp, blk->blkno, blk->disk_blkno, &blk->bp, XFS_ATTR_FORK); if (error) return(error); } else { blk->bp = NULL; } } return(0); } /* * Look up a filename in a node attribute list. * * This routine gets called for any attribute fork that has more than one * block, ie: both true Btree attr lists and for single-leaf-blocks with * "remote" values taking up more blocks. */ STATIC int xfs_attr_node_get(xfs_da_args_t *args) { xfs_da_state_t *state; xfs_da_state_blk_t *blk; int error, retval; int i; state = xfs_da_state_alloc(); state->args = args; state->mp = args->dp->i_mount; state->blocksize = state->mp->m_sb.sb_blocksize; state->node_ents = state->mp->m_attr_node_ents; /* * Search to see if name exists, and get back a pointer to it. */ error = xfs_da_node_lookup_int(state, &retval); if (error) { retval = error; } else if (retval == EEXIST) { blk = &state->path.blk[ state->path.active-1 ]; ASSERT(blk->bp != NULL); ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC); /* * Get the value, local or "remote" */ retval = xfs_attr_leaf_getvalue(blk->bp, args); if (!retval && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) { retval = xfs_attr_rmtval_get(args); } } /* * If not in a transaction, we have to release all the buffers. */ for (i = 0; i < state->path.active; i++) { xfs_da_brelse(args->trans, state->path.blk[i].bp); state->path.blk[i].bp = NULL; } xfs_da_state_free(state); return(retval); } STATIC int /* error */ xfs_attr_node_list(xfs_attr_list_context_t *context) { attrlist_cursor_kern_t *cursor; xfs_attr_leafblock_t *leaf; xfs_da_intnode_t *node; xfs_da_node_entry_t *btree; int error, i; xfs_dabuf_t *bp; cursor = context->cursor; cursor->initted = 1; /* * Do all sorts of validation on the passed-in cursor structure. * If anything is amiss, ignore the cursor and look up the hashval * starting from the btree root. */ bp = NULL; if (cursor->blkno > 0) { error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1, &bp, XFS_ATTR_FORK); if ((error != 0) && (error != EFSCORRUPTED)) return(error); if (bp) { node = bp->data; switch (be16_to_cpu(node->hdr.info.magic)) { case XFS_DA_NODE_MAGIC: xfs_attr_trace_l_cn("wrong blk", context, node); xfs_da_brelse(NULL, bp); bp = NULL; break; case XFS_ATTR_LEAF_MAGIC: leaf = bp->data; if (cursor->hashval > be32_to_cpu(leaf->entries[ be16_to_cpu(leaf->hdr.count)-1].hashval)) { xfs_attr_trace_l_cl("wrong blk", context, leaf); xfs_da_brelse(NULL, bp); bp = NULL; } else if (cursor->hashval <= be32_to_cpu(leaf->entries[0].hashval)) { xfs_attr_trace_l_cl("maybe wrong blk", context, leaf); xfs_da_brelse(NULL, bp); bp = NULL; } break; default: xfs_attr_trace_l_c("wrong blk - ??", context); xfs_da_brelse(NULL, bp); bp = NULL; } } } /* * We did not find what we expected given the cursor's contents, * so we start from the top and work down based on the hash value. * Note that start of node block is same as start of leaf block. */ if (bp == NULL) { cursor->blkno = 0; for (;;) { error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); if (unlikely(bp == NULL)) { XFS_ERROR_REPORT("xfs_attr_node_list(2)", XFS_ERRLEVEL_LOW, context->dp->i_mount); return(XFS_ERROR(EFSCORRUPTED)); } node = bp->data; if (be16_to_cpu(node->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC) break; if (unlikely(be16_to_cpu(node->hdr.info.magic) != XFS_DA_NODE_MAGIC)) { XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)", XFS_ERRLEVEL_LOW, context->dp->i_mount, node); xfs_da_brelse(NULL, bp); return(XFS_ERROR(EFSCORRUPTED)); } btree = node->btree; for (i = 0; i < be16_to_cpu(node->hdr.count); btree++, i++) { if (cursor->hashval <= be32_to_cpu(btree->hashval)) { cursor->blkno = be32_to_cpu(btree->before); xfs_attr_trace_l_cb("descending", context, btree); break; } } if (i == be16_to_cpu(node->hdr.count)) { xfs_da_brelse(NULL, bp); return(0); } xfs_da_brelse(NULL, bp); } } ASSERT(bp != NULL); /* * Roll upward through the blocks, processing each leaf block in * order. As long as there is space in the result buffer, keep * adding the information. */ for (;;) { leaf = bp->data; if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) { XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)", XFS_ERRLEVEL_LOW, context->dp->i_mount, leaf); xfs_da_brelse(NULL, bp); return(XFS_ERROR(EFSCORRUPTED)); } error = xfs_attr_leaf_list_int(bp, context); if (error) { xfs_da_brelse(NULL, bp); return error; } if (context->seen_enough || leaf->hdr.info.forw == 0) break; cursor->blkno = be32_to_cpu(leaf->hdr.info.forw); xfs_da_brelse(NULL, bp); error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1, &bp, XFS_ATTR_FORK); if (error) return(error); if (unlikely((bp == NULL))) { XFS_ERROR_REPORT("xfs_attr_node_list(5)", XFS_ERRLEVEL_LOW, context->dp->i_mount); return(XFS_ERROR(EFSCORRUPTED)); } } xfs_da_brelse(NULL, bp); return(0); } /*======================================================================== * External routines for manipulating out-of-line attribute values. *========================================================================*/ /* * Read the value associated with an attribute from the out-of-line buffer * that we stored it in. */ int xfs_attr_rmtval_get(xfs_da_args_t *args) { xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE]; xfs_mount_t *mp; xfs_daddr_t dblkno; xfs_caddr_t dst; xfs_buf_t *bp; int nmap, error, tmp, valuelen, blkcnt, i; xfs_dablk_t lblkno; ASSERT(!(args->flags & ATTR_KERNOVAL)); mp = args->dp->i_mount; dst = args->value; valuelen = args->valuelen; lblkno = args->rmtblkno; while (valuelen > 0) { nmap = ATTR_RMTVALUE_MAPSIZE; error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno, args->rmtblkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, NULL, 0, map, &nmap, NULL, NULL); if (error) return(error); ASSERT(nmap >= 1); for (i = 0; (i < nmap) && (valuelen > 0); i++) { ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) && (map[i].br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock); blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount); error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno, blkcnt, XFS_BUF_LOCK, &bp); if (error) return(error); tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen : XFS_BUF_SIZE(bp); xfs_biomove(bp, 0, tmp, dst, XFS_B_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; xfs_caddr_t src; xfs_buf_t *bp; xfs_dablk_t lblkno; int blkcnt, valuelen, nmap, error, tmp, committed; dp = args->dp; mp = dp->i_mount; src = args->value; /* * Find a "hole" in the attribute address space large enough for * us to drop the new attribute's value into. */ blkcnt = XFS_B_TO_FSB(mp, args->valuelen); lfileoff = 0; error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff, XFS_ATTR_FORK); if (error) { return(error); } args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff; args->rmtblkcnt = blkcnt; /* * Roll through the "value", allocating blocks on disk as required. */ while (blkcnt > 0) { /* * Allocate a single extent, up to the size of the value. */ XFS_BMAP_INIT(args->flist, args->firstblock); nmap = 1; error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno, blkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA | XFS_BMAPI_WRITE, args->firstblock, args->total, &map, &nmap, args->flist, NULL); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, dp); } ASSERT(nmap == 1); ASSERT((map.br_startblock != DELAYSTARTBLOCK) && (map.br_startblock != HOLESTARTBLOCK)); lblkno += map.br_blockcount; blkcnt -= map.br_blockcount; /* * Start the next trans in the chain. */ if ((error = xfs_attr_rolltrans(&args->trans, dp))) return (error); } /* * Roll through the "value", copying the attribute value to the * already-allocated blocks. Blocks are written synchronously * so that we can know they are all on disk before we turn off * the INCOMPLETE flag. */ lblkno = args->rmtblkno; valuelen = args->valuelen; while (valuelen > 0) { /* * Try to remember where we decided to put the value. */ XFS_BMAP_INIT(args->flist, args->firstblock); nmap = 1; error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno, args->rmtblkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, args->firstblock, 0, &map, &nmap, NULL, NULL); if (error) { return(error); } ASSERT(nmap == 1); ASSERT((map.br_startblock != DELAYSTARTBLOCK) && (map.br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno, blkcnt, XFS_BUF_LOCK); ASSERT(bp); ASSERT(!XFS_BUF_GETERROR(bp)); tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen : XFS_BUF_SIZE(bp); xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE); if (tmp < XFS_BUF_SIZE(bp)) xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp); if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */ return (error); } src += tmp; valuelen -= tmp; lblkno += map.br_blockcount; } ASSERT(valuelen == 0); return(0); } /* * Remove the value associated with an attribute by deleting the * out-of-line buffer that it is stored on. */ STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args) { xfs_mount_t *mp; xfs_bmbt_irec_t map; xfs_buf_t *bp; xfs_daddr_t dblkno; xfs_dablk_t lblkno; int valuelen, blkcnt, nmap, error, done, committed; mp = args->dp->i_mount; /* * Roll through the "value", invalidating the attribute value's * blocks. */ lblkno = args->rmtblkno; valuelen = args->rmtblkcnt; while (valuelen > 0) { /* * Try to remember where we decided to put the value. */ XFS_BMAP_INIT(args->flist, args->firstblock); nmap = 1; error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno, args->rmtblkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, args->firstblock, 0, &map, &nmap, args->flist, NULL); if (error) { return(error); } ASSERT(nmap == 1); ASSERT((map.br_startblock != DELAYSTARTBLOCK) && (map.br_startblock != HOLESTARTBLOCK)); dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock), blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount); /* * If the "remote" value is in the cache, remove it. */ bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt, XFS_INCORE_TRYLOCK); if (bp) { XFS_BUF_STALE(bp); XFS_BUF_UNDELAYWRITE(bp); xfs_buf_relse(bp); bp = NULL; } valuelen -= map.br_blockcount; lblkno += map.br_blockcount; } /* * Keep de-allocating extents until the remote-value region is gone. */ lblkno = args->rmtblkno; blkcnt = args->rmtblkcnt; done = 0; while (!done) { XFS_BMAP_INIT(args->flist, args->firstblock); error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt, XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA, 1, args->firstblock, args->flist, NULL, &done); if (!error) { error = xfs_bmap_finish(&args->trans, args->flist, *args->firstblock, &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, XFS_ILOCK_EXCL); xfs_trans_ihold(args->trans, args->dp); } /* * Close out trans and start the next one in the chain. */ if ((error = xfs_attr_rolltrans(&args->trans, args->dp))) return (error); } return(0); } #if defined(XFS_ATTR_TRACE) /* * Add a trace buffer entry for an attr_list context structure. */ void xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context) { xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where, (__psunsigned_t)context->dp, (__psunsigned_t)context->cursor->hashval, (__psunsigned_t)context->cursor->blkno, (__psunsigned_t)context->cursor->offset, (__psunsigned_t)context->alist, (__psunsigned_t)context->bufsize, (__psunsigned_t)context->count, (__psunsigned_t)context->firstu, (__psunsigned_t) ((context->count > 0) && !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL))) ? (ATTR_ENTRY(context->alist, context->count-1)->a_valuelen) : 0, (__psunsigned_t)context->dupcnt, (__psunsigned_t)context->flags, (__psunsigned_t)NULL, (__psunsigned_t)NULL, (__psunsigned_t)NULL); } /* * Add a trace buffer entry for a context structure and a Btree node. */ void xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context, struct xfs_da_intnode *node) { xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where, (__psunsigned_t)context->dp, (__psunsigned_t)context->cursor->hashval, (__psunsigned_t)context->cursor->blkno, (__psunsigned_t)context->cursor->offset, (__psunsigned_t)context->alist, (__psunsigned_t)context->bufsize, (__psunsigned_t)context->count, (__psunsigned_t)context->firstu, (__psunsigned_t) ((context->count > 0) && !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL))) ? (ATTR_ENTRY(context->alist, context->count-1)->a_valuelen) : 0, (__psunsigned_t)context->dupcnt, (__psunsigned_t)context->flags, (__psunsigned_t)be16_to_cpu(node->hdr.count), (__psunsigned_t)be32_to_cpu(node->btree[0].hashval), (__psunsigned_t)be32_to_cpu(node->btree[ be16_to_cpu(node->hdr.count)-1].hashval)); } /* * Add a trace buffer entry for a context structure and a Btree element. */ void xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context, struct xfs_da_node_entry *btree) { xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where, (__psunsigned_t)context->dp, (__psunsigned_t)context->cursor->hashval, (__psunsigned_t)context->cursor->blkno, (__psunsigned_t)context->cursor->offset, (__psunsigned_t)context->alist, (__psunsigned_t)context->bufsize, (__psunsigned_t)context->count, (__psunsigned_t)context->firstu, (__psunsigned_t) ((context->count > 0) && !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL))) ? (ATTR_ENTRY(context->alist, context->count-1)->a_valuelen) : 0, (__psunsigned_t)context->dupcnt, (__psunsigned_t)context->flags, (__psunsigned_t)be32_to_cpu(btree->hashval), (__psunsigned_t)be32_to_cpu(btree->before), (__psunsigned_t)NULL); } /* * Add a trace buffer entry for a context structure and a leaf block. */ void xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context, struct xfs_attr_leafblock *leaf) { xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where, (__psunsigned_t)context->dp, (__psunsigned_t)context->cursor->hashval, (__psunsigned_t)context->cursor->blkno, (__psunsigned_t)context->cursor->offset, (__psunsigned_t)context->alist, (__psunsigned_t)context->bufsize, (__psunsigned_t)context->count, (__psunsigned_t)context->firstu, (__psunsigned_t) ((context->count > 0) && !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL))) ? (ATTR_ENTRY(context->alist, context->count-1)->a_valuelen) : 0, (__psunsigned_t)context->dupcnt, (__psunsigned_t)context->flags, (__psunsigned_t)be16_to_cpu(leaf->hdr.count), (__psunsigned_t)be32_to_cpu(leaf->entries[0].hashval), (__psunsigned_t)be32_to_cpu(leaf->entries[ be16_to_cpu(leaf->hdr.count)-1].hashval)); } /* * Add a trace buffer entry for the arguments given to the routine, * generic form. */ void xfs_attr_trace_enter(int type, char *where, __psunsigned_t a2, __psunsigned_t a3, __psunsigned_t a4, __psunsigned_t a5, __psunsigned_t a6, __psunsigned_t a7, __psunsigned_t a8, __psunsigned_t a9, __psunsigned_t a10, __psunsigned_t a11, __psunsigned_t a12, __psunsigned_t a13, __psunsigned_t a14, __psunsigned_t a15) { ASSERT(xfs_attr_trace_buf); ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type), (void *)where, (void *)a2, (void *)a3, (void *)a4, (void *)a5, (void *)a6, (void *)a7, (void *)a8, (void *)a9, (void *)a10, (void *)a11, (void *)a12, (void *)a13, (void *)a14, (void *)a15); } #endif /* XFS_ATTR_TRACE */ /*======================================================================== * System (pseudo) namespace attribute interface routines. *========================================================================*/ STATIC int posix_acl_access_set( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS); } STATIC int posix_acl_access_remove( bhv_vnode_t *vp, char *name, int xflags) { return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS); } STATIC int posix_acl_access_get( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS); } STATIC int posix_acl_access_exists( bhv_vnode_t *vp) { return xfs_acl_vhasacl_access(vp); } STATIC int posix_acl_default_set( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT); } STATIC int posix_acl_default_get( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT); } STATIC int posix_acl_default_remove( bhv_vnode_t *vp, char *name, int xflags) { return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT); } STATIC int posix_acl_default_exists( bhv_vnode_t *vp) { return xfs_acl_vhasacl_default(vp); } STATIC struct attrnames posix_acl_access = { .attr_name = "posix_acl_access", .attr_namelen = sizeof("posix_acl_access") - 1, .attr_get = posix_acl_access_get, .attr_set = posix_acl_access_set, .attr_remove = posix_acl_access_remove, .attr_exists = posix_acl_access_exists, }; STATIC struct attrnames posix_acl_default = { .attr_name = "posix_acl_default", .attr_namelen = sizeof("posix_acl_default") - 1, .attr_get = posix_acl_default_get, .attr_set = posix_acl_default_set, .attr_remove = posix_acl_default_remove, .attr_exists = posix_acl_default_exists, }; STATIC struct attrnames *attr_system_names[] = { &posix_acl_access, &posix_acl_default }; /*======================================================================== * Namespace-prefix-style attribute name interface routines. *========================================================================*/ STATIC int attr_generic_set( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { return -bhv_vop_attr_set(vp, name, data, size, xflags, NULL); } STATIC int attr_generic_get( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { int error, asize = size; error = bhv_vop_attr_get(vp, name, data, &asize, xflags, NULL); if (!error) return asize; return -error; } STATIC int attr_generic_remove( bhv_vnode_t *vp, char *name, int xflags) { return -bhv_vop_attr_remove(vp, name, xflags, NULL); } STATIC int attr_generic_listadd( attrnames_t *prefix, attrnames_t *namesp, void *data, size_t size, ssize_t *result) { char *p = data + *result; *result += prefix->attr_namelen; *result += namesp->attr_namelen + 1; if (!size) return 0; if (*result > size) return -ERANGE; strcpy(p, prefix->attr_name); p += prefix->attr_namelen; strcpy(p, namesp->attr_name); p += namesp->attr_namelen + 1; return 0; } STATIC int attr_system_list( bhv_vnode_t *vp, void *data, size_t size, ssize_t *result) { attrnames_t *namesp; int i, error = 0; for (i = 0; i < ATTR_SYSCOUNT; i++) { namesp = attr_system_names[i]; if (!namesp->attr_exists || !namesp->attr_exists(vp)) continue; error = attr_generic_listadd(&attr_system, namesp, data, size, result); if (error) break; } return error; } int attr_generic_list( bhv_vnode_t *vp, void *data, size_t size, int xflags, ssize_t *result) { attrlist_cursor_kern_t cursor = { 0 }; int error; error = bhv_vop_attr_list(vp, data, size, xflags, &cursor, NULL); if (error > 0) return -error; *result = -error; return attr_system_list(vp, data, size, result); } attrnames_t * attr_lookup_namespace( char *name, struct attrnames **names, int nnames) { int i; for (i = 0; i < nnames; i++) if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen)) return names[i]; return NULL; } /* * Some checks to prevent people abusing EAs to get over quota: * - Don't allow modifying user EAs on devices/symlinks; * - Don't allow modifying user EAs if sticky bit set; */ STATIC int attr_user_capable( bhv_vnode_t *vp, cred_t *cred) { struct inode *inode = vn_to_inode(vp); if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) return -EPERM; if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) && !capable(CAP_SYS_ADMIN)) return -EPERM; if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) && (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER)) return -EPERM; return 0; } STATIC int attr_trusted_capable( bhv_vnode_t *vp, cred_t *cred) { struct inode *inode = vn_to_inode(vp); if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) return -EPERM; if (!capable(CAP_SYS_ADMIN)) return -EPERM; return 0; } STATIC int attr_secure_capable( bhv_vnode_t *vp, cred_t *cred) { return -ENOSECURITY; } STATIC int attr_system_set( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { attrnames_t *namesp; int error; if (xflags & ATTR_CREATE) return -EINVAL; namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT); if (!namesp) return -EOPNOTSUPP; error = namesp->attr_set(vp, name, data, size, xflags); if (!error) error = vn_revalidate(vp); return error; } STATIC int attr_system_get( bhv_vnode_t *vp, char *name, void *data, size_t size, int xflags) { attrnames_t *namesp; namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT); if (!namesp) return -EOPNOTSUPP; return namesp->attr_get(vp, name, data, size, xflags); } STATIC int attr_system_remove( bhv_vnode_t *vp, char *name, int xflags) { attrnames_t *namesp; namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT); if (!namesp) return -EOPNOTSUPP; return namesp->attr_remove(vp, name, xflags); } struct attrnames attr_system = { .attr_name = "system.", .attr_namelen = sizeof("system.") - 1, .attr_flag = ATTR_SYSTEM, .attr_get = attr_system_get, .attr_set = attr_system_set, .attr_remove = attr_system_remove, .attr_capable = (attrcapable_t)fs_noerr, }; struct attrnames attr_trusted = { .attr_name = "trusted.", .attr_namelen = sizeof("trusted.") - 1, .attr_flag = ATTR_ROOT, .attr_get = attr_generic_get, .attr_set = attr_generic_set, .attr_remove = attr_generic_remove, .attr_capable = attr_trusted_capable, }; struct attrnames attr_secure = { .attr_name = "security.", .attr_namelen = sizeof("security.") - 1, .attr_flag = ATTR_SECURE, .attr_get = attr_generic_get, .attr_set = attr_generic_set, .attr_remove = attr_generic_remove, .attr_capable = attr_secure_capable, }; struct attrnames attr_user = { .attr_name = "user.", .attr_namelen = sizeof("user.") - 1, .attr_get = attr_generic_get, .attr_set = attr_generic_set, .attr_remove = attr_generic_remove, .attr_capable = attr_user_capable, }; struct attrnames *attr_namespaces[] = { &attr_system, &attr_trusted, &attr_secure, &attr_user };