| /* |
| * 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( |
| xfs_inode_t *ip, |
| const char *name, |
| char *value, |
| int *valuelenp, |
| int flags, |
| cred_t *cred) |
| { |
| 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); |
| |
| /* |
| * 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(namelen, 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; |
| 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; |
| |
| /* |
| * 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 <<= 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); |
| 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, |
| &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); |
| 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( |
| xfs_inode_t *dp, |
| const char *name, |
| char *value, |
| int valuelen, |
| int flags) |
| { |
| int namelen; |
| |
| namelen = strlen(name); |
| if (namelen >= MAXNAMELEN) |
| return EFAULT; /* match IRIX behaviour */ |
| |
| XFS_STATS_INC(xs_attr_set); |
| |
| 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); |
| 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( |
| xfs_inode_t *dp, |
| const char *name, |
| int flags) |
| { |
| int namelen; |
| |
| namelen = strlen(name); |
| if (namelen >= MAXNAMELEN) |
| return EFAULT; /* match IRIX behaviour */ |
| |
| XFS_STATS_INC(xs_attr_remove); |
| |
| 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( |
| xfs_inode_t *dp, |
| char *buffer, |
| int bufsize, |
| int flags, |
| attrlist_cursor_kern_t *cursor) |
| { |
| xfs_attr_list_context_t context; |
| 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; |
| 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); |
| 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, |
| &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, |
| &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, |
| &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, |
| &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, |
| &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, |
| &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, |
| &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, |
| &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, |
| &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, |
| &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 }; |