1b3b94faaSDavid Teigland /* 2b3b94faaSDavid Teigland * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 33a8a9a10SSteven Whitehouse * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4b3b94faaSDavid Teigland * 5b3b94faaSDavid Teigland * This copyrighted material is made available to anyone wishing to use, 6b3b94faaSDavid Teigland * modify, copy, or redistribute it subject to the terms and conditions 7e9fc2aa0SSteven Whitehouse * of the GNU General Public License version 2. 8b3b94faaSDavid Teigland */ 9b3b94faaSDavid Teigland 10b3b94faaSDavid Teigland #include <linux/sched.h> 11b3b94faaSDavid Teigland #include <linux/slab.h> 12b3b94faaSDavid Teigland #include <linux/spinlock.h> 13b3b94faaSDavid Teigland #include <linux/completion.h> 14b3b94faaSDavid Teigland #include <linux/buffer_head.h> 152646a1f6SSteven Whitehouse #include <linux/xattr.h> 16b3b94faaSDavid Teigland #include <linux/posix_acl.h> 17b3b94faaSDavid Teigland #include <linux/posix_acl_xattr.h> 185c676f6dSSteven Whitehouse #include <linux/gfs2_ondisk.h> 19b3b94faaSDavid Teigland 20b3b94faaSDavid Teigland #include "gfs2.h" 215c676f6dSSteven Whitehouse #include "incore.h" 22b3b94faaSDavid Teigland #include "acl.h" 23307cf6e6SSteven Whitehouse #include "xattr.h" 24b3b94faaSDavid Teigland #include "glock.h" 25b3b94faaSDavid Teigland #include "inode.h" 26b3b94faaSDavid Teigland #include "meta_io.h" 27b3b94faaSDavid Teigland #include "trans.h" 285c676f6dSSteven Whitehouse #include "util.h" 29b3b94faaSDavid Teigland 30479c427dSSteven Whitehouse static const char *gfs2_acl_name(int type) 31b3b94faaSDavid Teigland { 32479c427dSSteven Whitehouse switch (type) { 33479c427dSSteven Whitehouse case ACL_TYPE_ACCESS: 34479c427dSSteven Whitehouse return GFS2_POSIX_ACL_ACCESS; 35479c427dSSteven Whitehouse case ACL_TYPE_DEFAULT: 36479c427dSSteven Whitehouse return GFS2_POSIX_ACL_DEFAULT; 37479c427dSSteven Whitehouse } 38479c427dSSteven Whitehouse return NULL; 39479c427dSSteven Whitehouse } 40b3b94faaSDavid Teigland 41479c427dSSteven Whitehouse static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type) 42479c427dSSteven Whitehouse { 43479c427dSSteven Whitehouse struct posix_acl *acl; 44479c427dSSteven Whitehouse const char *name; 45479c427dSSteven Whitehouse char *data; 46479c427dSSteven Whitehouse int len; 4740b78a32SSteven Whitehouse 483767ac21SSteven Whitehouse if (!ip->i_eattr) 49479c427dSSteven Whitehouse return NULL; 50b3b94faaSDavid Teigland 51106381bfSSteven Whitehouse acl = get_cached_acl(&ip->i_inode, type); 52106381bfSSteven Whitehouse if (acl != ACL_NOT_CACHED) 53106381bfSSteven Whitehouse return acl; 54106381bfSSteven Whitehouse 55479c427dSSteven Whitehouse name = gfs2_acl_name(type); 56479c427dSSteven Whitehouse if (name == NULL) 57479c427dSSteven Whitehouse return ERR_PTR(-EINVAL); 58b3b94faaSDavid Teigland 59479c427dSSteven Whitehouse len = gfs2_xattr_acl_get(ip, name, &data); 60479c427dSSteven Whitehouse if (len < 0) 61479c427dSSteven Whitehouse return ERR_PTR(len); 62479c427dSSteven Whitehouse if (len == 0) 63479c427dSSteven Whitehouse return NULL; 64b3b94faaSDavid Teigland 65479c427dSSteven Whitehouse acl = posix_acl_from_xattr(data, len); 6640b78a32SSteven Whitehouse kfree(data); 67479c427dSSteven Whitehouse return acl; 68b3b94faaSDavid Teigland } 69b3b94faaSDavid Teigland 704e34e719SChristoph Hellwig struct posix_acl *gfs2_get_acl(struct inode *inode, int type) 71b3b94faaSDavid Teigland { 724e34e719SChristoph Hellwig return gfs2_acl_get(GFS2_I(inode), type); 73b3b94faaSDavid Teigland } 74b3b94faaSDavid Teigland 75d3fb6120SAl Viro static int gfs2_set_mode(struct inode *inode, umode_t mode) 76b3b94faaSDavid Teigland { 7769dca424SSteven Whitehouse int error = 0; 78b3b94faaSDavid Teigland 7969dca424SSteven Whitehouse if (mode != inode->i_mode) { 8069dca424SSteven Whitehouse struct iattr iattr; 81b3b94faaSDavid Teigland 8269dca424SSteven Whitehouse iattr.ia_valid = ATTR_MODE; 8369dca424SSteven Whitehouse iattr.ia_mode = mode; 8469dca424SSteven Whitehouse 8569dca424SSteven Whitehouse error = gfs2_setattr_simple(GFS2_I(inode), &iattr); 86b3b94faaSDavid Teigland } 87b3b94faaSDavid Teigland 8869dca424SSteven Whitehouse return error; 89b3b94faaSDavid Teigland } 90b3b94faaSDavid Teigland 91479c427dSSteven Whitehouse static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl) 92b3b94faaSDavid Teigland { 93b3b94faaSDavid Teigland int error; 94479c427dSSteven Whitehouse int len; 95479c427dSSteven Whitehouse char *data; 96479c427dSSteven Whitehouse const char *name = gfs2_acl_name(type); 97479c427dSSteven Whitehouse 98479c427dSSteven Whitehouse BUG_ON(name == NULL); 99479c427dSSteven Whitehouse len = posix_acl_to_xattr(acl, NULL, 0); 100479c427dSSteven Whitehouse if (len == 0) 101479c427dSSteven Whitehouse return 0; 102479c427dSSteven Whitehouse data = kmalloc(len, GFP_NOFS); 103479c427dSSteven Whitehouse if (data == NULL) 104479c427dSSteven Whitehouse return -ENOMEM; 105479c427dSSteven Whitehouse error = posix_acl_to_xattr(acl, data, len); 106479c427dSSteven Whitehouse if (error < 0) 107479c427dSSteven Whitehouse goto out; 108431547b3SChristoph Hellwig error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); 109106381bfSSteven Whitehouse if (!error) 110106381bfSSteven Whitehouse set_cached_acl(inode, type, acl); 111479c427dSSteven Whitehouse out: 112479c427dSSteven Whitehouse kfree(data); 113479c427dSSteven Whitehouse return error; 114479c427dSSteven Whitehouse } 115479c427dSSteven Whitehouse 116479c427dSSteven Whitehouse int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode) 117479c427dSSteven Whitehouse { 118479c427dSSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 119826cae2fSAl Viro struct posix_acl *acl; 120d3fb6120SAl Viro umode_t mode = inode->i_mode; 121479c427dSSteven Whitehouse int error = 0; 122b3b94faaSDavid Teigland 123b3b94faaSDavid Teigland if (!sdp->sd_args.ar_posix_acl) 124b3b94faaSDavid Teigland return 0; 125479c427dSSteven Whitehouse if (S_ISLNK(inode->i_mode)) 126b3b94faaSDavid Teigland return 0; 127b3b94faaSDavid Teigland 128479c427dSSteven Whitehouse acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT); 129479c427dSSteven Whitehouse if (IS_ERR(acl)) 130479c427dSSteven Whitehouse return PTR_ERR(acl); 131b3b94faaSDavid Teigland if (!acl) { 132ce3b0f8dSAl Viro mode &= ~current_umask(); 133479c427dSSteven Whitehouse if (mode != inode->i_mode) 134479c427dSSteven Whitehouse error = gfs2_set_mode(inode, mode); 135b3b94faaSDavid Teigland return error; 136b3b94faaSDavid Teigland } 137b3b94faaSDavid Teigland 138479c427dSSteven Whitehouse if (S_ISDIR(inode->i_mode)) { 139479c427dSSteven Whitehouse error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl); 140479c427dSSteven Whitehouse if (error) 141479c427dSSteven Whitehouse goto out; 142479c427dSSteven Whitehouse } 143479c427dSSteven Whitehouse 144826cae2fSAl Viro error = posix_acl_create(&acl, GFP_NOFS, &mode); 145b3b94faaSDavid Teigland if (error < 0) 146826cae2fSAl Viro return error; 147826cae2fSAl Viro 14840b78a32SSteven Whitehouse if (error == 0) 14940b78a32SSteven Whitehouse goto munge; 15040b78a32SSteven Whitehouse 151479c427dSSteven Whitehouse error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl); 152b3b94faaSDavid Teigland if (error) 153b3b94faaSDavid Teigland goto out; 15440b78a32SSteven Whitehouse munge: 155479c427dSSteven Whitehouse error = gfs2_set_mode(inode, mode); 156b3b94faaSDavid Teigland out: 157b3b94faaSDavid Teigland posix_acl_release(acl); 158b3b94faaSDavid Teigland return error; 159b3b94faaSDavid Teigland } 160b3b94faaSDavid Teigland 161b3b94faaSDavid Teigland int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) 162b3b94faaSDavid Teigland { 163bc26ab5fSAl Viro struct posix_acl *acl; 164b3b94faaSDavid Teigland char *data; 165b3b94faaSDavid Teigland unsigned int len; 166b3b94faaSDavid Teigland int error; 167b3b94faaSDavid Teigland 168479c427dSSteven Whitehouse acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS); 169479c427dSSteven Whitehouse if (IS_ERR(acl)) 170479c427dSSteven Whitehouse return PTR_ERR(acl); 171b3b94faaSDavid Teigland if (!acl) 172b3b94faaSDavid Teigland return gfs2_setattr_simple(ip, attr); 173b3b94faaSDavid Teigland 174bc26ab5fSAl Viro error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode); 175bc26ab5fSAl Viro if (error) 176bc26ab5fSAl Viro return error; 177b3b94faaSDavid Teigland 178479c427dSSteven Whitehouse len = posix_acl_to_xattr(acl, NULL, 0); 179479c427dSSteven Whitehouse data = kmalloc(len, GFP_NOFS); 180479c427dSSteven Whitehouse error = -ENOMEM; 181479c427dSSteven Whitehouse if (data == NULL) 182479c427dSSteven Whitehouse goto out; 183b3b94faaSDavid Teigland posix_acl_to_xattr(acl, data, len); 184479c427dSSteven Whitehouse error = gfs2_xattr_acl_chmod(ip, attr, data); 185479c427dSSteven Whitehouse kfree(data); 186106381bfSSteven Whitehouse set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl); 187b3b94faaSDavid Teigland 188b3b94faaSDavid Teigland out: 189b3b94faaSDavid Teigland posix_acl_release(acl); 190b3b94faaSDavid Teigland return error; 191b3b94faaSDavid Teigland } 192b3b94faaSDavid Teigland 1932646a1f6SSteven Whitehouse static int gfs2_acl_type(const char *name) 1942646a1f6SSteven Whitehouse { 1952646a1f6SSteven Whitehouse if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0) 1962646a1f6SSteven Whitehouse return ACL_TYPE_ACCESS; 1972646a1f6SSteven Whitehouse if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0) 1982646a1f6SSteven Whitehouse return ACL_TYPE_DEFAULT; 1992646a1f6SSteven Whitehouse return -EINVAL; 2002646a1f6SSteven Whitehouse } 2012646a1f6SSteven Whitehouse 202431547b3SChristoph Hellwig static int gfs2_xattr_system_get(struct dentry *dentry, const char *name, 203431547b3SChristoph Hellwig void *buffer, size_t size, int xtype) 2042646a1f6SSteven Whitehouse { 205431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 206f72f2d2eSSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 207106381bfSSteven Whitehouse struct posix_acl *acl; 2082646a1f6SSteven Whitehouse int type; 209106381bfSSteven Whitehouse int error; 2102646a1f6SSteven Whitehouse 211f72f2d2eSSteven Whitehouse if (!sdp->sd_args.ar_posix_acl) 212f72f2d2eSSteven Whitehouse return -EOPNOTSUPP; 213f72f2d2eSSteven Whitehouse 2142646a1f6SSteven Whitehouse type = gfs2_acl_type(name); 2152646a1f6SSteven Whitehouse if (type < 0) 2162646a1f6SSteven Whitehouse return type; 2172646a1f6SSteven Whitehouse 218106381bfSSteven Whitehouse acl = gfs2_acl_get(GFS2_I(inode), type); 219106381bfSSteven Whitehouse if (IS_ERR(acl)) 220106381bfSSteven Whitehouse return PTR_ERR(acl); 221106381bfSSteven Whitehouse if (acl == NULL) 222106381bfSSteven Whitehouse return -ENODATA; 2232646a1f6SSteven Whitehouse 224106381bfSSteven Whitehouse error = posix_acl_to_xattr(acl, buffer, size); 225106381bfSSteven Whitehouse posix_acl_release(acl); 226106381bfSSteven Whitehouse 227106381bfSSteven Whitehouse return error; 228106381bfSSteven Whitehouse } 2292646a1f6SSteven Whitehouse 230431547b3SChristoph Hellwig static int gfs2_xattr_system_set(struct dentry *dentry, const char *name, 231431547b3SChristoph Hellwig const void *value, size_t size, int flags, 232431547b3SChristoph Hellwig int xtype) 2332646a1f6SSteven Whitehouse { 234431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 2352646a1f6SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 2362646a1f6SSteven Whitehouse struct posix_acl *acl = NULL; 2372646a1f6SSteven Whitehouse int error = 0, type; 2382646a1f6SSteven Whitehouse 2392646a1f6SSteven Whitehouse if (!sdp->sd_args.ar_posix_acl) 2402646a1f6SSteven Whitehouse return -EOPNOTSUPP; 2412646a1f6SSteven Whitehouse 2422646a1f6SSteven Whitehouse type = gfs2_acl_type(name); 2432646a1f6SSteven Whitehouse if (type < 0) 2442646a1f6SSteven Whitehouse return type; 2452646a1f6SSteven Whitehouse if (flags & XATTR_CREATE) 2462646a1f6SSteven Whitehouse return -EINVAL; 2472646a1f6SSteven Whitehouse if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) 2482646a1f6SSteven Whitehouse return value ? -EACCES : 0; 2492646a1f6SSteven Whitehouse if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER)) 2502646a1f6SSteven Whitehouse return -EPERM; 2512646a1f6SSteven Whitehouse if (S_ISLNK(inode->i_mode)) 2522646a1f6SSteven Whitehouse return -EOPNOTSUPP; 2532646a1f6SSteven Whitehouse 2542646a1f6SSteven Whitehouse if (!value) 2552646a1f6SSteven Whitehouse goto set_acl; 2562646a1f6SSteven Whitehouse 2572646a1f6SSteven Whitehouse acl = posix_acl_from_xattr(value, size); 2582646a1f6SSteven Whitehouse if (!acl) { 2592646a1f6SSteven Whitehouse /* 2602646a1f6SSteven Whitehouse * acl_set_file(3) may request that we set default ACLs with 2612646a1f6SSteven Whitehouse * zero length -- defend (gracefully) against that here. 2622646a1f6SSteven Whitehouse */ 2632646a1f6SSteven Whitehouse goto out; 2642646a1f6SSteven Whitehouse } 2652646a1f6SSteven Whitehouse if (IS_ERR(acl)) { 2662646a1f6SSteven Whitehouse error = PTR_ERR(acl); 2672646a1f6SSteven Whitehouse goto out; 2682646a1f6SSteven Whitehouse } 2692646a1f6SSteven Whitehouse 2702646a1f6SSteven Whitehouse error = posix_acl_valid(acl); 2712646a1f6SSteven Whitehouse if (error) 2722646a1f6SSteven Whitehouse goto out_release; 2732646a1f6SSteven Whitehouse 2742646a1f6SSteven Whitehouse error = -EINVAL; 2752646a1f6SSteven Whitehouse if (acl->a_count > GFS2_ACL_MAX_ENTRIES) 2762646a1f6SSteven Whitehouse goto out_release; 2772646a1f6SSteven Whitehouse 2782646a1f6SSteven Whitehouse if (type == ACL_TYPE_ACCESS) { 279d6952123SAl Viro umode_t mode = inode->i_mode; 2802646a1f6SSteven Whitehouse error = posix_acl_equiv_mode(acl, &mode); 2812646a1f6SSteven Whitehouse 2822646a1f6SSteven Whitehouse if (error <= 0) { 2832646a1f6SSteven Whitehouse posix_acl_release(acl); 2842646a1f6SSteven Whitehouse acl = NULL; 2852646a1f6SSteven Whitehouse 2862646a1f6SSteven Whitehouse if (error < 0) 2872646a1f6SSteven Whitehouse return error; 2882646a1f6SSteven Whitehouse } 2892646a1f6SSteven Whitehouse 2902646a1f6SSteven Whitehouse error = gfs2_set_mode(inode, mode); 2912646a1f6SSteven Whitehouse if (error) 2922646a1f6SSteven Whitehouse goto out_release; 2932646a1f6SSteven Whitehouse } 2942646a1f6SSteven Whitehouse 2952646a1f6SSteven Whitehouse set_acl: 296431547b3SChristoph Hellwig error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS); 297106381bfSSteven Whitehouse if (!error) { 298106381bfSSteven Whitehouse if (acl) 299106381bfSSteven Whitehouse set_cached_acl(inode, type, acl); 300106381bfSSteven Whitehouse else 301106381bfSSteven Whitehouse forget_cached_acl(inode, type); 302106381bfSSteven Whitehouse } 3032646a1f6SSteven Whitehouse out_release: 3042646a1f6SSteven Whitehouse posix_acl_release(acl); 3052646a1f6SSteven Whitehouse out: 3062646a1f6SSteven Whitehouse return error; 3072646a1f6SSteven Whitehouse } 3082646a1f6SSteven Whitehouse 309b7bb0a12SStephen Hemminger const struct xattr_handler gfs2_xattr_system_handler = { 3102646a1f6SSteven Whitehouse .prefix = XATTR_SYSTEM_PREFIX, 311431547b3SChristoph Hellwig .flags = GFS2_EATYPE_SYS, 3122646a1f6SSteven Whitehouse .get = gfs2_xattr_system_get, 3132646a1f6SSteven Whitehouse .set = gfs2_xattr_system_set, 3142646a1f6SSteven Whitehouse }; 3152646a1f6SSteven Whitehouse 316