diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/xattr.c')
-rw-r--r-- | drivers/staging/lustre/lustre/llite/xattr.c | 578 |
1 files changed, 578 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/llite/xattr.c b/drivers/staging/lustre/lustre/llite/xattr.c new file mode 100644 index 000000000000..4176264984bb --- /dev/null +++ b/drivers/staging/lustre/lustre/llite/xattr.c @@ -0,0 +1,578 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2011, 2012, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + */ + +#include <linux/fs.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/selinux.h> + +#define DEBUG_SUBSYSTEM S_LLITE + +#include <obd_support.h> +#include <lustre_lite.h> +#include <lustre_dlm.h> +#include <lustre_ver.h> +#include <lustre_eacl.h> + +#include "llite_internal.h" + +#define XATTR_USER_T (1) +#define XATTR_TRUSTED_T (2) +#define XATTR_SECURITY_T (3) +#define XATTR_ACL_ACCESS_T (4) +#define XATTR_ACL_DEFAULT_T (5) +#define XATTR_LUSTRE_T (6) +#define XATTR_OTHER_T (7) + +static +int get_xattr_type(const char *name) +{ + if (!strcmp(name, POSIX_ACL_XATTR_ACCESS)) + return XATTR_ACL_ACCESS_T; + + if (!strcmp(name, POSIX_ACL_XATTR_DEFAULT)) + return XATTR_ACL_DEFAULT_T; + + if (!strncmp(name, XATTR_USER_PREFIX, + sizeof(XATTR_USER_PREFIX) - 1)) + return XATTR_USER_T; + + if (!strncmp(name, XATTR_TRUSTED_PREFIX, + sizeof(XATTR_TRUSTED_PREFIX) - 1)) + return XATTR_TRUSTED_T; + + if (!strncmp(name, XATTR_SECURITY_PREFIX, + sizeof(XATTR_SECURITY_PREFIX) - 1)) + return XATTR_SECURITY_T; + + if (!strncmp(name, XATTR_LUSTRE_PREFIX, + sizeof(XATTR_LUSTRE_PREFIX) - 1)) + return XATTR_LUSTRE_T; + + return XATTR_OTHER_T; +} + +static +int xattr_type_filter(struct ll_sb_info *sbi, int xattr_type) +{ + if ((xattr_type == XATTR_ACL_ACCESS_T || + xattr_type == XATTR_ACL_DEFAULT_T) && + !(sbi->ll_flags & LL_SBI_ACL)) + return -EOPNOTSUPP; + + if (xattr_type == XATTR_USER_T && !(sbi->ll_flags & LL_SBI_USER_XATTR)) + return -EOPNOTSUPP; + if (xattr_type == XATTR_TRUSTED_T && !cfs_capable(CFS_CAP_SYS_ADMIN)) + return -EPERM; + if (xattr_type == XATTR_OTHER_T) + return -EOPNOTSUPP; + + return 0; +} + +static +int ll_setxattr_common(struct inode *inode, const char *name, + const void *value, size_t size, + int flags, __u64 valid) +{ + struct ll_sb_info *sbi = ll_i2sbi(inode); + struct ptlrpc_request *req; + int xattr_type, rc; + struct obd_capa *oc; + posix_acl_xattr_header *new_value = NULL; + struct rmtacl_ctl_entry *rce = NULL; + ext_acl_xattr_header *acl = NULL; + const char *pv = value; + ENTRY; + + xattr_type = get_xattr_type(name); + rc = xattr_type_filter(sbi, xattr_type); + if (rc) + RETURN(rc); + + /* b10667: ignore lustre special xattr for now */ + if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) || + (xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0)) + RETURN(0); + + /* b15587: ignore security.capability xattr for now */ + if ((xattr_type == XATTR_SECURITY_T && + strcmp(name, "security.capability") == 0)) + RETURN(0); + + /* LU-549: Disable security.selinux when selinux is disabled */ + if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() && + strcmp(name, "security.selinux") == 0) + RETURN(-EOPNOTSUPP); + +#ifdef CONFIG_FS_POSIX_ACL + if (sbi->ll_flags & LL_SBI_RMT_CLIENT && + (xattr_type == XATTR_ACL_ACCESS_T || + xattr_type == XATTR_ACL_DEFAULT_T)) { + rce = rct_search(&sbi->ll_rct, current_pid()); + if (rce == NULL || + (rce->rce_ops != RMT_LSETFACL && + rce->rce_ops != RMT_RSETFACL)) + RETURN(-EOPNOTSUPP); + + if (rce->rce_ops == RMT_LSETFACL) { + struct eacl_entry *ee; + + ee = et_search_del(&sbi->ll_et, current_pid(), + ll_inode2fid(inode), xattr_type); + LASSERT(ee != NULL); + if (valid & OBD_MD_FLXATTR) { + acl = lustre_acl_xattr_merge2ext( + (posix_acl_xattr_header *)value, + size, ee->ee_acl); + if (IS_ERR(acl)) { + ee_free(ee); + RETURN(PTR_ERR(acl)); + } + size = CFS_ACL_XATTR_SIZE(\ + le32_to_cpu(acl->a_count), \ + ext_acl_xattr); + pv = (const char *)acl; + } + ee_free(ee); + } else if (rce->rce_ops == RMT_RSETFACL) { + size = lustre_posix_acl_xattr_filter( + (posix_acl_xattr_header *)value, + size, &new_value); + if (unlikely(size < 0)) + RETURN(size); + + pv = (const char *)new_value; + } else + RETURN(-EOPNOTSUPP); + + valid |= rce_ops2valid(rce->rce_ops); + } +#endif + oc = ll_mdscapa_get(inode); + rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc, + valid, name, pv, size, 0, flags, ll_i2suppgid(inode), + &req); + capa_put(oc); +#ifdef CONFIG_FS_POSIX_ACL + if (new_value != NULL) + lustre_posix_acl_xattr_free(new_value, size); + if (acl != NULL) + lustre_ext_acl_xattr_free(acl); +#endif + if (rc) { + if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) { + LCONSOLE_INFO("Disabling user_xattr feature because " + "it is not supported on the server\n"); + sbi->ll_flags &= ~LL_SBI_USER_XATTR; + } + RETURN(rc); + } + + ptlrpc_req_finished(req); + RETURN(0); +} + +int ll_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + struct inode *inode = dentry->d_inode; + + LASSERT(inode); + LASSERT(name); + + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n", + inode->i_ino, inode->i_generation, inode, name); + + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1); + + if ((strncmp(name, XATTR_TRUSTED_PREFIX, + sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 && + strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) || + (strncmp(name, XATTR_LUSTRE_PREFIX, + sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 && + strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) { + struct lov_user_md *lump = (struct lov_user_md *)value; + int rc = 0; + + /* Attributes that are saved via getxattr will always have + * the stripe_offset as 0. Instead, the MDS should be + * allowed to pick the starting OST index. b=17846 */ + if (lump != NULL && lump->lmm_stripe_offset == 0) + lump->lmm_stripe_offset = -1; + + if (lump != NULL && S_ISREG(inode->i_mode)) { + struct file f; + int flags = FMODE_WRITE; + int lum_size = (lump->lmm_magic == LOV_USER_MAGIC_V1) ? + sizeof(*lump) : sizeof(struct lov_user_md_v3); + + f.f_dentry = dentry; + rc = ll_lov_setstripe_ea_info(inode, &f, flags, lump, + lum_size); + /* b10667: rc always be 0 here for now */ + rc = 0; + } else if (S_ISDIR(inode->i_mode)) { + rc = ll_dir_setstripe(inode, lump, 0); + } + + return rc; + + } else if (strcmp(name, XATTR_NAME_LMA) == 0 || + strcmp(name, XATTR_NAME_LINK) == 0) + return 0; + + return ll_setxattr_common(inode, name, value, size, flags, + OBD_MD_FLXATTR); +} + +int ll_removexattr(struct dentry *dentry, const char *name) +{ + struct inode *inode = dentry->d_inode; + + LASSERT(inode); + LASSERT(name); + + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n", + inode->i_ino, inode->i_generation, inode, name); + + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1); + return ll_setxattr_common(inode, name, NULL, 0, 0, + OBD_MD_FLXATTRRM); +} + +static +int ll_getxattr_common(struct inode *inode, const char *name, + void *buffer, size_t size, __u64 valid) +{ + struct ll_sb_info *sbi = ll_i2sbi(inode); + struct ptlrpc_request *req = NULL; + struct mdt_body *body; + int xattr_type, rc; + void *xdata; + struct obd_capa *oc; + struct rmtacl_ctl_entry *rce = NULL; + ENTRY; + + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", + inode->i_ino, inode->i_generation, inode); + + /* listxattr have slightly different behavior from of ext3: + * without 'user_xattr' ext3 will list all xattr names but + * filtered out "^user..*"; we list them all for simplicity. + */ + if (!name) { + xattr_type = XATTR_OTHER_T; + goto do_getxattr; + } + + xattr_type = get_xattr_type(name); + rc = xattr_type_filter(sbi, xattr_type); + if (rc) + RETURN(rc); + + /* b15587: ignore security.capability xattr for now */ + if ((xattr_type == XATTR_SECURITY_T && + strcmp(name, "security.capability") == 0)) + RETURN(-ENODATA); + + /* LU-549: Disable security.selinux when selinux is disabled */ + if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() && + strcmp(name, "security.selinux") == 0) + RETURN(-EOPNOTSUPP); + +#ifdef CONFIG_FS_POSIX_ACL + if (sbi->ll_flags & LL_SBI_RMT_CLIENT && + (xattr_type == XATTR_ACL_ACCESS_T || + xattr_type == XATTR_ACL_DEFAULT_T)) { + rce = rct_search(&sbi->ll_rct, current_pid()); + if (rce == NULL || + (rce->rce_ops != RMT_LSETFACL && + rce->rce_ops != RMT_LGETFACL && + rce->rce_ops != RMT_RSETFACL && + rce->rce_ops != RMT_RGETFACL)) + RETURN(-EOPNOTSUPP); + } + + /* posix acl is under protection of LOOKUP lock. when calling to this, + * we just have path resolution to the target inode, so we have great + * chance that cached ACL is uptodate. + */ + if (xattr_type == XATTR_ACL_ACCESS_T && + !(sbi->ll_flags & LL_SBI_RMT_CLIENT)) { + struct ll_inode_info *lli = ll_i2info(inode); + struct posix_acl *acl; + + spin_lock(&lli->lli_lock); + acl = posix_acl_dup(lli->lli_posix_acl); + spin_unlock(&lli->lli_lock); + + if (!acl) + RETURN(-ENODATA); + + rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); + posix_acl_release(acl); + RETURN(rc); + } + if (xattr_type == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode)) + RETURN(-ENODATA); +#endif + +do_getxattr: + oc = ll_mdscapa_get(inode); + rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc, + valid | (rce ? rce_ops2valid(rce->rce_ops) : 0), + name, NULL, 0, size, 0, &req); + capa_put(oc); + if (rc) { + if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) { + LCONSOLE_INFO("Disabling user_xattr feature because " + "it is not supported on the server\n"); + sbi->ll_flags &= ~LL_SBI_USER_XATTR; + } + RETURN(rc); + } + + body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY); + LASSERT(body); + + /* only detect the xattr size */ + if (size == 0) + GOTO(out, rc = body->eadatasize); + + if (size < body->eadatasize) { + CERROR("server bug: replied size %u > %u\n", + body->eadatasize, (int)size); + GOTO(out, rc = -ERANGE); + } + + if (body->eadatasize == 0) + GOTO(out, rc = -ENODATA); + + /* do not need swab xattr data */ + xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA, + body->eadatasize); + if (!xdata) + GOTO(out, rc = -EFAULT); + +#ifdef CONFIG_FS_POSIX_ACL + if (body->eadatasize >= 0 && rce && rce->rce_ops == RMT_LSETFACL) { + ext_acl_xattr_header *acl; + + acl = lustre_posix_acl_xattr_2ext((posix_acl_xattr_header *)xdata, + body->eadatasize); + if (IS_ERR(acl)) + GOTO(out, rc = PTR_ERR(acl)); + + rc = ee_add(&sbi->ll_et, current_pid(), ll_inode2fid(inode), + xattr_type, acl); + if (unlikely(rc < 0)) { + lustre_ext_acl_xattr_free(acl); + GOTO(out, rc); + } + } +#endif + + if (body->eadatasize == 0) { + rc = -ENODATA; + } else { + LASSERT(buffer); + memcpy(buffer, xdata, body->eadatasize); + rc = body->eadatasize; + } + EXIT; +out: + ptlrpc_req_finished(req); + return rc; +} + +ssize_t ll_getxattr(struct dentry *dentry, const char *name, + void *buffer, size_t size) +{ + struct inode *inode = dentry->d_inode; + + LASSERT(inode); + LASSERT(name); + + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n", + inode->i_ino, inode->i_generation, inode, name); + + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1); + + if ((strncmp(name, XATTR_TRUSTED_PREFIX, + sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 && + strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) || + (strncmp(name, XATTR_LUSTRE_PREFIX, + sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 && + strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) { + struct lov_stripe_md *lsm; + struct lov_user_md *lump; + struct lov_mds_md *lmm = NULL; + struct ptlrpc_request *request = NULL; + int rc = 0, lmmsize = 0; + + if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) + return -ENODATA; + + if (size == 0 && S_ISDIR(inode->i_mode)) { + /* XXX directory EA is fix for now, optimize to save + * RPC transfer */ + GOTO(out, rc = sizeof(struct lov_user_md)); + } + + lsm = ccc_inode_lsm_get(inode); + if (lsm == NULL) { + if (S_ISDIR(inode->i_mode)) { + rc = ll_dir_getstripe(inode, &lmm, + &lmmsize, &request); + } else { + rc = -ENODATA; + } + } else { + /* LSM is present already after lookup/getattr call. + * we need to grab layout lock once it is implemented */ + rc = obd_packmd(ll_i2dtexp(inode), &lmm, lsm); + lmmsize = rc; + } + ccc_inode_lsm_put(inode, lsm); + + if (rc < 0) + GOTO(out, rc); + + if (size == 0) { + /* used to call ll_get_max_mdsize() forward to get + * the maximum buffer size, while some apps (such as + * rsync 3.0.x) care much about the exact xattr value + * size */ + rc = lmmsize; + GOTO(out, rc); + } + + if (size < lmmsize) { + CERROR("server bug: replied size %d > %d for %s (%s)\n", + lmmsize, (int)size, dentry->d_name.name, name); + GOTO(out, rc = -ERANGE); + } + + lump = (struct lov_user_md *)buffer; + memcpy(lump, lmm, lmmsize); + /* do not return layout gen for getxattr otherwise it would + * confuse tar --xattr by recognizing layout gen as stripe + * offset when the file is restored. See LU-2809. */ + lump->lmm_layout_gen = 0; + + rc = lmmsize; +out: + if (request) + ptlrpc_req_finished(request); + else if (lmm) + obd_free_diskmd(ll_i2dtexp(inode), &lmm); + return(rc); + } + + return ll_getxattr_common(inode, name, buffer, size, OBD_MD_FLXATTR); +} + +ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size) +{ + struct inode *inode = dentry->d_inode; + int rc = 0, rc2 = 0; + struct lov_mds_md *lmm = NULL; + struct ptlrpc_request *request = NULL; + int lmmsize; + + LASSERT(inode); + + CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", + inode->i_ino, inode->i_generation, inode); + + ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LISTXATTR, 1); + + rc = ll_getxattr_common(inode, NULL, buffer, size, OBD_MD_FLXATTRLS); + if (rc < 0) + GOTO(out, rc); + + if (buffer != NULL) { + struct ll_sb_info *sbi = ll_i2sbi(inode); + char *xattr_name = buffer; + int xlen, rem = rc; + + while (rem > 0) { + xlen = strnlen(xattr_name, rem - 1) + 1; + rem -= xlen; + if (xattr_type_filter(sbi, + get_xattr_type(xattr_name)) == 0) { + /* skip OK xattr type + * leave it in buffer + */ + xattr_name += xlen; + continue; + } + /* move up remaining xattrs in buffer + * removing the xattr that is not OK + */ + memmove(xattr_name, xattr_name + xlen, rem); + rc -= xlen; + } + } + if (S_ISREG(inode->i_mode)) { + if (!ll_i2info(inode)->lli_has_smd) + rc2 = -1; + } else if (S_ISDIR(inode->i_mode)) { + rc2 = ll_dir_getstripe(inode, &lmm, &lmmsize, &request); + } + + if (rc2 < 0) { + GOTO(out, rc2 = 0); + } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) { + const int prefix_len = sizeof(XATTR_LUSTRE_PREFIX) - 1; + const size_t name_len = sizeof("lov") - 1; + const size_t total_len = prefix_len + name_len + 1; + + if (buffer && (rc + total_len) <= size) { + buffer += rc; + memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len); + memcpy(buffer + prefix_len, "lov", name_len); + buffer[prefix_len + name_len] = '\0'; + } + rc2 = total_len; + } +out: + ptlrpc_req_finished(request); + rc = rc + rc2; + + return rc; +} |