diff options
Diffstat (limited to 'fs/xfs/xfs_attr.c')
| -rw-r--r-- | fs/xfs/xfs_attr.c | 2660 |
1 files changed, 2660 insertions, 0 deletions
diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c new file mode 100644 index 000000000000..ee8b5904ec7c --- /dev/null +++ b/fs/xfs/xfs_attr.c @@ -0,0 +1,2660 @@ +/* + * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 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. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ + +#include "xfs.h" + +#include "xfs_macros.h" +#include "xfs_types.h" +#include "xfs_inum.h" +#include "xfs_log.h" +#include "xfs_trans.h" +#include "xfs_sb.h" +#include "xfs_ag.h" +#include "xfs_dir.h" +#include "xfs_dir2.h" +#include "xfs_dmapi.h" +#include "xfs_mount.h" +#include "xfs_alloc_btree.h" +#include "xfs_bmap_btree.h" +#include "xfs_ialloc_btree.h" +#include "xfs_alloc.h" +#include "xfs_btree.h" +#include "xfs_attr_sf.h" +#include "xfs_dir_sf.h" +#include "xfs_dir2_sf.h" +#include "xfs_dinode.h" +#include "xfs_inode_item.h" +#include "xfs_inode.h" +#include "xfs_bmap.h" +#include "xfs_da_btree.h" +#include "xfs_attr.h" +#include "xfs_attr_leaf.h" +#include "xfs_error.h" +#include "xfs_bit.h" +#include "xfs_quota.h" +#include "xfs_rw.h" +#include "xfs_trans_space.h" +#include "xfs_acl.h" + +/* + * xfs_attr.c + * + * Provide the external interfaces to manage attribute lists. + */ + +/*======================================================================== + * Function prototypes for the kernel. + *========================================================================*/ + +/* + * Internal routines when attribute list fits inside the inode. + */ +STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args); + +/* + * Internal routines when attribute list is one block. + */ +STATIC int xfs_attr_leaf_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_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_get(xfs_da_args_t *args); +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, 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); + + if (!(flags & (ATTR_KERNACCESS|ATTR_SECURE))) { + if ((error = xfs_iaccess(ip, S_IRUSR, cred))) + return(XFS_ERROR(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 = *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, 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); +} + +/*ARGSUSED*/ +int /* error */ +xfs_attr_set(bhv_desc_t *bdp, char *name, char *value, int valuelen, int flags, + struct cred *cred) +{ + xfs_da_args_t args; + xfs_inode_t *dp; + xfs_fsblock_t firstblock; + xfs_bmap_free_t flist; + int error, err2, committed; + int local, size; + uint nblks; + xfs_mount_t *mp; + int rsvd = (flags & ATTR_ROOT) != 0; + int namelen; + + namelen = strlen(name); + if (namelen >= MAXNAMELEN) + return EFAULT; /* match IRIX behaviour */ + + XFS_STATS_INC(xs_attr_set); + + dp = XFS_BHVTOI(bdp); + mp = dp->i_mount; + if (XFS_FORCED_SHUTDOWN(mp)) + return (EIO); + + xfs_ilock(dp, XFS_ILOCK_SHARED); + if (!(flags & ATTR_SECURE) && + (error = xfs_iaccess(dp, S_IWUSR, cred))) { + xfs_iunlock(dp, XFS_ILOCK_SHARED); + return(XFS_ERROR(error)); + } + xfs_iunlock(dp, XFS_ILOCK_SHARED); + + /* + * 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) { + error = xfs_bmap_add_attrfork(dp, rsvd); + if (error) + 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.oknoent = 1; + + /* Determine space new attribute will use, and if it will be inline + * or out of line. + */ + size = xfs_attr_leaf_newentsize(&args, 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-existant 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) + (void)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); +} + +/* + * Generic handler routine to remove a name from an attribute list. + * Transitions attribute list from Btree to shortform as necessary. + */ +/*ARGSUSED*/ +int /* error */ +xfs_attr_remove(bhv_desc_t *bdp, char *name, int flags, struct cred *cred) +{ + xfs_da_args_t args; + xfs_inode_t *dp; + xfs_fsblock_t firstblock; + xfs_bmap_free_t flist; + int error; + xfs_mount_t *mp; + int namelen; + + ASSERT(MAXNAMELEN-1<=0xff); /* length is stored in uint8 */ + namelen = strlen(name); + if (namelen>=MAXNAMELEN) + return EFAULT; /* match irix behaviour */ + + XFS_STATS_INC(xs_attr_remove); + + dp = XFS_BHVTOI(bdp); + mp = dp->i_mount; + if (XFS_FORCED_SHUTDOWN(mp)) + return (EIO); + + xfs_ilock(dp, XFS_ILOCK_SHARED); + if (!(flags & ATTR_SECURE) && + (error = xfs_iaccess(dp, S_IWUSR, cred))) { + xfs_iunlock(dp, XFS_ILOCK_SHARED); + return(XFS_ERROR(error)); + } else 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); + + /* + * 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); +} + +/* + * 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; + if (!(flags & ATTR_KERNAMELS)) { + context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */ + context.firstu = context.bufsize; + context.alist = (attrlist_t *)buffer; + context.alist->al_count = 0; + context.alist->al_more = 0; + context.alist->al_offset[0] = context.bufsize; + } + else { + context.bufsize = bufsize; + context.firstu = context.bufsize; + context.alist = (attrlist_t *)buffer; + } + + if (XFS_FORCED_SHUTDOWN(dp->i_mount)) + return (EIO); + + xfs_ilock(dp, XFS_ILOCK_SHARED); + if (!(flags & ATTR_SECURE) && + (error = xfs_iaccess(dp, S_IRUSR, cred))) { + xfs_iunlock(dp, XFS_ILOCK_SHARED); + return(XFS_ERROR(error)); + } + + /* + * Decide on what work routines to call based on the inode size. + */ + xfs_attr_trace_l_c("syscall start", &context); + 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); + } + xfs_iunlock(dp, XFS_ILOCK_SHARED); + xfs_attr_trace_l_c("syscall end", &context); + + if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) { + ASSERT(error >= 0); + } + else { /* must return negated buffer size or the error */ + if (context.count < 0) + error = XFS_ERROR(ERANGE); + else + error = -context.count; + } + + 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, 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); + } + + newsize = XFS_ATTR_SF_TOTSIZE(args->dp); + newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen); + if ((newsize <= XFS_IFORK_ASIZE(args->dp)) && + (args->namelen < XFS_ATTR_SF_ENTSIZE_MAX) && + (args->valuelen < XFS_ATTR_SF_ENTSIZE_MAX)) { + retval = xfs_attr_shortform_add(args); + ASSERT(retval == 0); + } else { + return(XFS_ERROR(ENOSPC)); + } + 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; + + /* + * 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 (xfs_attr_shortform_allfit(bp, dp)) { + XFS_BMAP_INIT(args->flist, args->firstblock); + error = xfs_attr_leaf_to_shortform(bp, args); + /* 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 committed; + int error; + + /* + * 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 (xfs_attr_shortform_allfit(bp, dp)) { + XFS_BMAP_INIT(args->flist, args->firstblock); + error = xfs_attr_leaf_to_shortform(bp, args); + /* 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). + */ +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(error); + ASSERT(bp != NULL); + leaf = bp->data; + if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + != 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)); + } + + (void)xfs_attr_leaf_list_int(bp, context); + xfs_da_brelse(NULL, bp); + return(0); +} + + +/*======================================================================== + * 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; + + /* + * 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(INT_GET(((xfs_attr_leafblock_t *) + bp->data)->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC); + + if (xfs_attr_shortform_allfit(bp, dp)) { + XFS_BMAP_INIT(args->flist, args->firstblock); + error = xfs_attr_leaf_to_shortform(bp, args); + /* 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 commit's has 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 commit's has 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. + */ +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 (INT_GET(node->hdr.info.magic, ARCH_CONVERT)) { + 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 > + INT_GET(leaf->entries[ + INT_GET(leaf->hdr.count, + ARCH_CONVERT)-1].hashval, + ARCH_CONVERT)) { + xfs_attr_trace_l_cl("wrong blk", + context, leaf); + xfs_da_brelse(NULL, bp); + bp = NULL; + } else if (cursor->hashval <= + INT_GET(leaf->entries[0].hashval, + ARCH_CONVERT)) { + 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 (INT_GET(node->hdr.info.magic, ARCH_CONVERT) + == XFS_ATTR_LEAF_MAGIC) + break; + if (unlikely(INT_GET(node->hdr.info.magic, ARCH_CONVERT) + != 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 < INT_GET(node->hdr.count, ARCH_CONVERT); + btree++, i++) { + if (cursor->hashval + <= INT_GET(btree->hashval, + ARCH_CONVERT)) { + cursor->blkno = INT_GET(btree->before, ARCH_CONVERT); + xfs_attr_trace_l_cb("descending", + context, btree); + break; + } + } + if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) { + 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(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) + != 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 || !leaf->hdr.info.forw) + break; /* not really an error, buffer full or EOF */ + cursor->blkno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT); + 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. + */ +STATIC 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); + 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); + 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); + 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); + 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, &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)INT_GET(node->hdr.count, ARCH_CONVERT), + (__psunsigned_t)INT_GET(node->btree[0].hashval, ARCH_CONVERT), + (__psunsigned_t)INT_GET(node->btree[INT_GET(node->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT)); +} + +/* + * 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)INT_GET(btree->hashval, ARCH_CONVERT), + (__psunsigned_t)INT_GET(btree->before, ARCH_CONVERT), + (__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)INT_GET(leaf->hdr.count, ARCH_CONVERT), + (__psunsigned_t)INT_GET(leaf->entries[0].hashval, ARCH_CONVERT), + (__psunsigned_t)INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT)); +} + +/* + * 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( + 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( + struct vnode *vp, char *name, int xflags) +{ + return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS); +} + +STATIC int +posix_acl_access_get( + 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( + vnode_t *vp) +{ + return xfs_acl_vhasacl_access(vp); +} + +STATIC int +posix_acl_default_set( + 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( + 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( + struct vnode *vp, char *name, int xflags) +{ + return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT); +} + +STATIC int +posix_acl_default_exists( + vnode_t *vp) +{ + return xfs_acl_vhasacl_default(vp); +} + +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, +}; + +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, +}; + +struct attrnames *attr_system_names[] = + { &posix_acl_access, &posix_acl_default }; + + +/*======================================================================== + * Namespace-prefix-style attribute name interface routines. + *========================================================================*/ + +STATIC int +attr_generic_set( + struct vnode *vp, char *name, void *data, size_t size, int xflags) +{ + int error; + + VOP_ATTR_SET(vp, name, data, size, xflags, NULL, error); + return -error; +} + +STATIC int +attr_generic_get( + struct vnode *vp, char *name, void *data, size_t size, int xflags) +{ + int error, asize = size; + + VOP_ATTR_GET(vp, name, data, &asize, xflags, NULL, error); + if (!error) + return asize; + return -error; +} + +STATIC int +attr_generic_remove( + struct vnode *vp, char *name, int xflags) +{ + int error; + + VOP_ATTR_REMOVE(vp, name, xflags, NULL, error); + return -error; +} + +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( + struct vnode *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( + struct vnode *vp, void *data, size_t size, int xflags, ssize_t *result) +{ + attrlist_cursor_kern_t cursor = { 0 }; + int error; + + VOP_ATTR_LIST(vp, data, size, xflags, &cursor, NULL, error); + 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( + struct vnode *vp, + cred_t *cred) +{ + struct inode *inode = LINVFS_GET_IP(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( + struct vnode *vp, + cred_t *cred) +{ + struct inode *inode = LINVFS_GET_IP(vp); + + if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) + return -EPERM; + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + return 0; +} + +STATIC int +attr_secure_capable( + struct vnode *vp, + cred_t *cred) +{ + return -ENOSECURITY; +} + +STATIC int +attr_system_set( + struct vnode *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( + struct vnode *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( + struct vnode *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 }; |