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e45aa45298
Export all the symbols for the system attribute (SA) API. This allows external module to cleanly manipulate the SAs associated with a dnode. Documention for the SA API can be found in the module/zfs/sa.c source. This change also removes the zfs_sa_uprade_pre, and zfs_sa_uprade_post prototypes. The functions themselves were dropped some time ago. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
345 lines
11 KiB
C
345 lines
11 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/vnode.h>
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#include <sys/sa.h>
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#include <sys/zfs_acl.h>
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#include <sys/zfs_sa.h>
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/*
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* ZPL attribute registration table.
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* Order of attributes doesn't matter
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* a unique value will be assigned for each
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* attribute that is file system specific
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*
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* This is just the set of ZPL attributes that this
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* version of ZFS deals with natively. The file system
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* could have other attributes stored in files, but they will be
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* ignored. The SA framework will preserve them, just that
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* this version of ZFS won't change or delete them.
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*/
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sa_attr_reg_t zfs_attr_table[ZPL_END+1] = {
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{"ZPL_ATIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 0},
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{"ZPL_MTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 1},
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{"ZPL_CTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 2},
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{"ZPL_CRTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 3},
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{"ZPL_GEN", sizeof (uint64_t), SA_UINT64_ARRAY, 4},
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{"ZPL_MODE", sizeof (uint64_t), SA_UINT64_ARRAY, 5},
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{"ZPL_SIZE", sizeof (uint64_t), SA_UINT64_ARRAY, 6},
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{"ZPL_PARENT", sizeof (uint64_t), SA_UINT64_ARRAY, 7},
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{"ZPL_LINKS", sizeof (uint64_t), SA_UINT64_ARRAY, 8},
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{"ZPL_XATTR", sizeof (uint64_t), SA_UINT64_ARRAY, 9},
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{"ZPL_RDEV", sizeof (uint64_t), SA_UINT64_ARRAY, 10},
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{"ZPL_FLAGS", sizeof (uint64_t), SA_UINT64_ARRAY, 11},
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{"ZPL_UID", sizeof (uint64_t), SA_UINT64_ARRAY, 12},
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{"ZPL_GID", sizeof (uint64_t), SA_UINT64_ARRAY, 13},
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{"ZPL_PAD", sizeof (uint64_t) * 4, SA_UINT64_ARRAY, 14},
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{"ZPL_ZNODE_ACL", 88, SA_UINT8_ARRAY, 15},
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{"ZPL_DACL_COUNT", sizeof (uint64_t), SA_UINT64_ARRAY, 0},
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{"ZPL_SYMLINK", 0, SA_UINT8_ARRAY, 0},
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{"ZPL_SCANSTAMP", 32, SA_UINT8_ARRAY, 0},
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{"ZPL_DACL_ACES", 0, SA_ACL, 0},
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{NULL, 0, 0, 0}
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};
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#ifdef _KERNEL
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int
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zfs_sa_readlink(znode_t *zp, uio_t *uio)
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{
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dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
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size_t bufsz;
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int error;
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bufsz = zp->z_size;
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if (bufsz + ZFS_OLD_ZNODE_PHYS_SIZE <= db->db_size) {
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error = uiomove((caddr_t)db->db_data +
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ZFS_OLD_ZNODE_PHYS_SIZE,
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MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio);
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} else {
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dmu_buf_t *dbp;
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if ((error = dmu_buf_hold(ZTOZSB(zp)->z_os, zp->z_id,
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0, FTAG, &dbp, DMU_READ_NO_PREFETCH)) == 0) {
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error = uiomove(dbp->db_data,
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MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio);
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dmu_buf_rele(dbp, FTAG);
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}
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}
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return (error);
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}
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void
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zfs_sa_symlink(znode_t *zp, char *link, int len, dmu_tx_t *tx)
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{
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dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
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if (ZFS_OLD_ZNODE_PHYS_SIZE + len <= dmu_bonus_max()) {
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VERIFY(dmu_set_bonus(db,
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len + ZFS_OLD_ZNODE_PHYS_SIZE, tx) == 0);
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if (len) {
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bcopy(link, (caddr_t)db->db_data +
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ZFS_OLD_ZNODE_PHYS_SIZE, len);
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}
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} else {
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dmu_buf_t *dbp;
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zfs_grow_blocksize(zp, len, tx);
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VERIFY(0 == dmu_buf_hold(ZTOZSB(zp)->z_os,
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zp->z_id, 0, FTAG, &dbp, DMU_READ_NO_PREFETCH));
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dmu_buf_will_dirty(dbp, tx);
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ASSERT3U(len, <=, dbp->db_size);
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bcopy(link, dbp->db_data, len);
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dmu_buf_rele(dbp, FTAG);
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}
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}
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void
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zfs_sa_get_scanstamp(znode_t *zp, xvattr_t *xvap)
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{
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zfs_sb_t *zsb = ZTOZSB(zp);
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xoptattr_t *xoap;
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ASSERT(MUTEX_HELD(&zp->z_lock));
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VERIFY((xoap = xva_getxoptattr(xvap)) != NULL);
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if (zp->z_is_sa) {
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if (sa_lookup(zp->z_sa_hdl, SA_ZPL_SCANSTAMP(zsb),
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&xoap->xoa_av_scanstamp,
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sizeof (xoap->xoa_av_scanstamp)) != 0)
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return;
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} else {
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dmu_object_info_t doi;
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dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
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int len;
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if (!(zp->z_pflags & ZFS_BONUS_SCANSTAMP))
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return;
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sa_object_info(zp->z_sa_hdl, &doi);
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len = sizeof (xoap->xoa_av_scanstamp) +
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ZFS_OLD_ZNODE_PHYS_SIZE;
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if (len <= doi.doi_bonus_size) {
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(void) memcpy(xoap->xoa_av_scanstamp,
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(caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
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sizeof (xoap->xoa_av_scanstamp));
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}
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}
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XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
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}
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void
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zfs_sa_set_scanstamp(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
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{
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zfs_sb_t *zsb = ZTOZSB(zp);
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xoptattr_t *xoap;
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ASSERT(MUTEX_HELD(&zp->z_lock));
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VERIFY((xoap = xva_getxoptattr(xvap)) != NULL);
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if (zp->z_is_sa)
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VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SCANSTAMP(zsb),
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&xoap->xoa_av_scanstamp,
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sizeof (xoap->xoa_av_scanstamp), tx));
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else {
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dmu_object_info_t doi;
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dmu_buf_t *db = sa_get_db(zp->z_sa_hdl);
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int len;
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sa_object_info(zp->z_sa_hdl, &doi);
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len = sizeof (xoap->xoa_av_scanstamp) +
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ZFS_OLD_ZNODE_PHYS_SIZE;
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if (len > doi.doi_bonus_size)
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VERIFY(dmu_set_bonus(db, len, tx) == 0);
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(void) memcpy((caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
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xoap->xoa_av_scanstamp, sizeof (xoap->xoa_av_scanstamp));
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zp->z_pflags |= ZFS_BONUS_SCANSTAMP;
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VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_FLAGS(zsb),
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&zp->z_pflags, sizeof (uint64_t), tx));
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}
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}
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/*
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* I'm not convinced we should do any of this upgrade.
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* since the SA code can read both old/new znode formats
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* with probably little to know performance difference.
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*
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* All new files will be created with the new format.
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*/
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void
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zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
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{
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dmu_buf_t *db = sa_get_db(hdl);
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znode_t *zp = sa_get_userdata(hdl);
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zfs_sb_t *zsb = ZTOZSB(zp);
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int count = 0;
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sa_bulk_attr_t *bulk, *sa_attrs;
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zfs_acl_locator_cb_t locate = { 0 };
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uint64_t uid, gid, mode, rdev, xattr, parent;
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uint64_t crtime[2], mtime[2], ctime[2];
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zfs_acl_phys_t znode_acl;
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char scanstamp[AV_SCANSTAMP_SZ];
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boolean_t drop_lock = B_FALSE;
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/*
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* No upgrade if ACL isn't cached
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* since we won't know which locks are held
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* and ready the ACL would require special "locked"
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* interfaces that would be messy
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*/
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if (zp->z_acl_cached == NULL || S_ISLNK(ZTOI(zp)->i_mode))
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return;
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/*
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* If the z_lock is held and we aren't the owner
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* the just return since we don't want to deadlock
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* trying to update the status of z_is_sa. This
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* file can then be upgraded at a later time.
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*
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* Otherwise, we know we are doing the
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* sa_update() that caused us to enter this function.
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*/
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if (mutex_owner(&zp->z_lock) != curthread) {
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if (mutex_tryenter(&zp->z_lock) == 0)
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return;
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else
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drop_lock = B_TRUE;
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}
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/* First do a bulk query of the attributes that aren't cached */
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bulk = kmem_alloc(sizeof(sa_bulk_attr_t) * 20, KM_SLEEP);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zsb), NULL, &crtime, 16);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb), NULL, &mode, 8);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zsb), NULL, &parent, 8);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_XATTR(zsb), NULL, &xattr, 8);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_RDEV(zsb), NULL, &rdev, 8);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zsb), NULL, &uid, 8);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zsb), NULL, &gid, 8);
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SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zsb), NULL,
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&znode_acl, 88);
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if (sa_bulk_lookup_locked(hdl, bulk, count) != 0) {
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kmem_free(bulk, sizeof(sa_bulk_attr_t) * 20);
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goto done;
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}
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/*
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* While the order here doesn't matter its best to try and organize
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* it is such a way to pick up an already existing layout number
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*/
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count = 0;
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sa_attrs = kmem_zalloc(sizeof(sa_bulk_attr_t) * 20, KM_SLEEP);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MODE(zsb), NULL, &mode, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SIZE(zsb), NULL,
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&zp->z_size, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GEN(zsb),
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NULL, &zp->z_gen, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_UID(zsb), NULL, &uid, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_GID(zsb), NULL, &gid, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_PARENT(zsb),
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NULL, &parent, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_FLAGS(zsb), NULL,
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&zp->z_pflags, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_ATIME(zsb), NULL,
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zp->z_atime, 16);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MTIME(zsb), NULL,
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&mtime, 16);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CTIME(zsb), NULL,
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&ctime, 16);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_CRTIME(zsb), NULL,
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&crtime, 16);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_LINKS(zsb), NULL,
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&zp->z_links, 8);
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if (S_ISBLK(ZTOI(zp)->i_mode) || S_ISCHR(ZTOI(zp)->i_mode))
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_RDEV(zsb), NULL,
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&rdev, 8);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_COUNT(zsb), NULL,
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&zp->z_acl_cached->z_acl_count, 8);
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if (zp->z_acl_cached->z_version < ZFS_ACL_VERSION_FUID)
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zfs_acl_xform(zp, zp->z_acl_cached, CRED());
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locate.cb_aclp = zp->z_acl_cached;
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_DACL_ACES(zsb),
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zfs_acl_data_locator, &locate, zp->z_acl_cached->z_acl_bytes);
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if (xattr)
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_XATTR(zsb),
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NULL, &xattr, 8);
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/* if scanstamp then add scanstamp */
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if (zp->z_pflags & ZFS_BONUS_SCANSTAMP) {
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bcopy((caddr_t)db->db_data + ZFS_OLD_ZNODE_PHYS_SIZE,
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scanstamp, AV_SCANSTAMP_SZ);
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SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SCANSTAMP(zsb),
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NULL, scanstamp, AV_SCANSTAMP_SZ);
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zp->z_pflags &= ~ZFS_BONUS_SCANSTAMP;
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}
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VERIFY(dmu_set_bonustype(db, DMU_OT_SA, tx) == 0);
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VERIFY(sa_replace_all_by_template_locked(hdl, sa_attrs,
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count, tx) == 0);
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if (znode_acl.z_acl_extern_obj)
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VERIFY(0 == dmu_object_free(zsb->z_os,
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znode_acl.z_acl_extern_obj, tx));
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zp->z_is_sa = B_TRUE;
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kmem_free(sa_attrs, sizeof(sa_bulk_attr_t) * 20);
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kmem_free(bulk, sizeof(sa_bulk_attr_t) * 20);
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done:
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if (drop_lock)
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mutex_exit(&zp->z_lock);
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}
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void
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zfs_sa_upgrade_txholds(dmu_tx_t *tx, znode_t *zp)
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{
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if (!ZTOZSB(zp)->z_use_sa || zp->z_is_sa)
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return;
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dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
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if (zfs_external_acl(zp)) {
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dmu_tx_hold_free(tx, zfs_external_acl(zp), 0,
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DMU_OBJECT_END);
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}
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}
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EXPORT_SYMBOL(zfs_sa_readlink);
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EXPORT_SYMBOL(zfs_sa_symlink);
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EXPORT_SYMBOL(zfs_sa_get_scanstamp);
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EXPORT_SYMBOL(zfs_sa_set_scanstamp);
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EXPORT_SYMBOL(zfs_sa_upgrade);
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EXPORT_SYMBOL(zfs_sa_upgrade_txholds);
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#endif
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