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 41018a01cdSSteven Whitehouse struct posix_acl *gfs2_get_acl(struct inode *inode, int type) 42479c427dSSteven Whitehouse { 43018a01cdSSteven Whitehouse struct gfs2_inode *ip = GFS2_I(inode); 44479c427dSSteven Whitehouse struct posix_acl *acl; 45479c427dSSteven Whitehouse const char *name; 46479c427dSSteven Whitehouse char *data; 47479c427dSSteven Whitehouse int len; 4840b78a32SSteven Whitehouse 493767ac21SSteven Whitehouse if (!ip->i_eattr) 50479c427dSSteven Whitehouse return NULL; 51b3b94faaSDavid Teigland 52106381bfSSteven Whitehouse acl = get_cached_acl(&ip->i_inode, type); 53106381bfSSteven Whitehouse if (acl != ACL_NOT_CACHED) 54106381bfSSteven Whitehouse return acl; 55106381bfSSteven Whitehouse 56479c427dSSteven Whitehouse name = gfs2_acl_name(type); 57479c427dSSteven Whitehouse if (name == NULL) 58479c427dSSteven Whitehouse return ERR_PTR(-EINVAL); 59b3b94faaSDavid Teigland 60479c427dSSteven Whitehouse len = gfs2_xattr_acl_get(ip, name, &data); 61479c427dSSteven Whitehouse if (len < 0) 62479c427dSSteven Whitehouse return ERR_PTR(len); 63479c427dSSteven Whitehouse if (len == 0) 64479c427dSSteven Whitehouse return NULL; 65b3b94faaSDavid Teigland 66479c427dSSteven Whitehouse acl = posix_acl_from_xattr(data, len); 6740b78a32SSteven Whitehouse kfree(data); 68479c427dSSteven Whitehouse return acl; 69b3b94faaSDavid Teigland } 70b3b94faaSDavid Teigland 71d3fb6120SAl Viro static int gfs2_set_mode(struct inode *inode, umode_t mode) 72b3b94faaSDavid Teigland { 7369dca424SSteven Whitehouse int error = 0; 74b3b94faaSDavid Teigland 7569dca424SSteven Whitehouse if (mode != inode->i_mode) { 7669dca424SSteven Whitehouse struct iattr iattr; 77b3b94faaSDavid Teigland 7869dca424SSteven Whitehouse iattr.ia_valid = ATTR_MODE; 7969dca424SSteven Whitehouse iattr.ia_mode = mode; 8069dca424SSteven Whitehouse 81ab9bbda0SSteven Whitehouse error = gfs2_setattr_simple(inode, &iattr); 82b3b94faaSDavid Teigland } 83b3b94faaSDavid Teigland 8469dca424SSteven Whitehouse return error; 85b3b94faaSDavid Teigland } 86b3b94faaSDavid Teigland 87479c427dSSteven Whitehouse static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl) 88b3b94faaSDavid Teigland { 89b3b94faaSDavid Teigland int error; 90479c427dSSteven Whitehouse int len; 91479c427dSSteven Whitehouse char *data; 92479c427dSSteven Whitehouse const char *name = gfs2_acl_name(type); 93479c427dSSteven Whitehouse 94479c427dSSteven Whitehouse BUG_ON(name == NULL); 95479c427dSSteven Whitehouse len = posix_acl_to_xattr(acl, NULL, 0); 96479c427dSSteven Whitehouse if (len == 0) 97479c427dSSteven Whitehouse return 0; 98479c427dSSteven Whitehouse data = kmalloc(len, GFP_NOFS); 99479c427dSSteven Whitehouse if (data == NULL) 100479c427dSSteven Whitehouse return -ENOMEM; 101479c427dSSteven Whitehouse error = posix_acl_to_xattr(acl, data, len); 102479c427dSSteven Whitehouse if (error < 0) 103479c427dSSteven Whitehouse goto out; 104431547b3SChristoph Hellwig error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); 105106381bfSSteven Whitehouse if (!error) 106106381bfSSteven Whitehouse set_cached_acl(inode, type, acl); 107479c427dSSteven Whitehouse out: 108479c427dSSteven Whitehouse kfree(data); 109479c427dSSteven Whitehouse return error; 110479c427dSSteven Whitehouse } 111479c427dSSteven Whitehouse 112479c427dSSteven Whitehouse int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode) 113479c427dSSteven Whitehouse { 114479c427dSSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 115826cae2fSAl Viro struct posix_acl *acl; 116d3fb6120SAl Viro umode_t mode = inode->i_mode; 117479c427dSSteven Whitehouse int error = 0; 118b3b94faaSDavid Teigland 119b3b94faaSDavid Teigland if (!sdp->sd_args.ar_posix_acl) 120b3b94faaSDavid Teigland return 0; 121479c427dSSteven Whitehouse if (S_ISLNK(inode->i_mode)) 122b3b94faaSDavid Teigland return 0; 123b3b94faaSDavid Teigland 124018a01cdSSteven Whitehouse acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT); 125479c427dSSteven Whitehouse if (IS_ERR(acl)) 126479c427dSSteven Whitehouse return PTR_ERR(acl); 127b3b94faaSDavid Teigland if (!acl) { 128ce3b0f8dSAl Viro mode &= ~current_umask(); 129479c427dSSteven Whitehouse if (mode != inode->i_mode) 130479c427dSSteven Whitehouse error = gfs2_set_mode(inode, mode); 131b3b94faaSDavid Teigland return error; 132b3b94faaSDavid Teigland } 133b3b94faaSDavid Teigland 134479c427dSSteven Whitehouse if (S_ISDIR(inode->i_mode)) { 135479c427dSSteven Whitehouse error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl); 136479c427dSSteven Whitehouse if (error) 137479c427dSSteven Whitehouse goto out; 138479c427dSSteven Whitehouse } 139479c427dSSteven Whitehouse 140826cae2fSAl Viro error = posix_acl_create(&acl, GFP_NOFS, &mode); 141b3b94faaSDavid Teigland if (error < 0) 142826cae2fSAl Viro return error; 143826cae2fSAl Viro 14440b78a32SSteven Whitehouse if (error == 0) 14540b78a32SSteven Whitehouse goto munge; 14640b78a32SSteven Whitehouse 147479c427dSSteven Whitehouse error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl); 148b3b94faaSDavid Teigland if (error) 149b3b94faaSDavid Teigland goto out; 15040b78a32SSteven Whitehouse munge: 151479c427dSSteven Whitehouse error = gfs2_set_mode(inode, mode); 152b3b94faaSDavid Teigland out: 153b3b94faaSDavid Teigland posix_acl_release(acl); 154b3b94faaSDavid Teigland return error; 155b3b94faaSDavid Teigland } 156b3b94faaSDavid Teigland 157b3b94faaSDavid Teigland int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) 158b3b94faaSDavid Teigland { 159ab9bbda0SSteven Whitehouse struct inode *inode = &ip->i_inode; 160bc26ab5fSAl Viro struct posix_acl *acl; 161b3b94faaSDavid Teigland char *data; 162b3b94faaSDavid Teigland unsigned int len; 163b3b94faaSDavid Teigland int error; 164b3b94faaSDavid Teigland 165018a01cdSSteven Whitehouse acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS); 166479c427dSSteven Whitehouse if (IS_ERR(acl)) 167479c427dSSteven Whitehouse return PTR_ERR(acl); 168b3b94faaSDavid Teigland if (!acl) 169ab9bbda0SSteven Whitehouse return gfs2_setattr_simple(inode, attr); 170b3b94faaSDavid Teigland 171bc26ab5fSAl Viro error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode); 172bc26ab5fSAl Viro if (error) 173bc26ab5fSAl Viro return error; 174b3b94faaSDavid Teigland 175479c427dSSteven Whitehouse len = posix_acl_to_xattr(acl, NULL, 0); 176479c427dSSteven Whitehouse data = kmalloc(len, GFP_NOFS); 177479c427dSSteven Whitehouse error = -ENOMEM; 178479c427dSSteven Whitehouse if (data == NULL) 179479c427dSSteven Whitehouse goto out; 180b3b94faaSDavid Teigland posix_acl_to_xattr(acl, data, len); 181479c427dSSteven Whitehouse error = gfs2_xattr_acl_chmod(ip, attr, data); 182479c427dSSteven Whitehouse kfree(data); 183106381bfSSteven Whitehouse set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl); 184b3b94faaSDavid Teigland 185b3b94faaSDavid Teigland out: 186b3b94faaSDavid Teigland posix_acl_release(acl); 187b3b94faaSDavid Teigland return error; 188b3b94faaSDavid Teigland } 189b3b94faaSDavid Teigland 1902646a1f6SSteven Whitehouse static int gfs2_acl_type(const char *name) 1912646a1f6SSteven Whitehouse { 1922646a1f6SSteven Whitehouse if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0) 1932646a1f6SSteven Whitehouse return ACL_TYPE_ACCESS; 1942646a1f6SSteven Whitehouse if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0) 1952646a1f6SSteven Whitehouse return ACL_TYPE_DEFAULT; 1962646a1f6SSteven Whitehouse return -EINVAL; 1972646a1f6SSteven Whitehouse } 1982646a1f6SSteven Whitehouse 199431547b3SChristoph Hellwig static int gfs2_xattr_system_get(struct dentry *dentry, const char *name, 200431547b3SChristoph Hellwig void *buffer, size_t size, int xtype) 2012646a1f6SSteven Whitehouse { 202431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 203f72f2d2eSSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 204106381bfSSteven Whitehouse struct posix_acl *acl; 2052646a1f6SSteven Whitehouse int type; 206106381bfSSteven Whitehouse int error; 2072646a1f6SSteven Whitehouse 208f72f2d2eSSteven Whitehouse if (!sdp->sd_args.ar_posix_acl) 209f72f2d2eSSteven Whitehouse return -EOPNOTSUPP; 210f72f2d2eSSteven Whitehouse 2112646a1f6SSteven Whitehouse type = gfs2_acl_type(name); 2122646a1f6SSteven Whitehouse if (type < 0) 2132646a1f6SSteven Whitehouse return type; 2142646a1f6SSteven Whitehouse 215018a01cdSSteven Whitehouse acl = gfs2_get_acl(inode, type); 216106381bfSSteven Whitehouse if (IS_ERR(acl)) 217106381bfSSteven Whitehouse return PTR_ERR(acl); 218106381bfSSteven Whitehouse if (acl == NULL) 219106381bfSSteven Whitehouse return -ENODATA; 2202646a1f6SSteven Whitehouse 221106381bfSSteven Whitehouse error = posix_acl_to_xattr(acl, buffer, size); 222106381bfSSteven Whitehouse posix_acl_release(acl); 223106381bfSSteven Whitehouse 224106381bfSSteven Whitehouse return error; 225106381bfSSteven Whitehouse } 2262646a1f6SSteven Whitehouse 227431547b3SChristoph Hellwig static int gfs2_xattr_system_set(struct dentry *dentry, const char *name, 228431547b3SChristoph Hellwig const void *value, size_t size, int flags, 229431547b3SChristoph Hellwig int xtype) 2302646a1f6SSteven Whitehouse { 231431547b3SChristoph Hellwig struct inode *inode = dentry->d_inode; 2322646a1f6SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 2332646a1f6SSteven Whitehouse struct posix_acl *acl = NULL; 2342646a1f6SSteven Whitehouse int error = 0, type; 2352646a1f6SSteven Whitehouse 2362646a1f6SSteven Whitehouse if (!sdp->sd_args.ar_posix_acl) 2372646a1f6SSteven Whitehouse return -EOPNOTSUPP; 2382646a1f6SSteven Whitehouse 2392646a1f6SSteven Whitehouse type = gfs2_acl_type(name); 2402646a1f6SSteven Whitehouse if (type < 0) 2412646a1f6SSteven Whitehouse return type; 2422646a1f6SSteven Whitehouse if (flags & XATTR_CREATE) 2432646a1f6SSteven Whitehouse return -EINVAL; 2442646a1f6SSteven Whitehouse if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) 2452646a1f6SSteven Whitehouse return value ? -EACCES : 0; 2462646a1f6SSteven Whitehouse if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER)) 2472646a1f6SSteven Whitehouse return -EPERM; 2482646a1f6SSteven Whitehouse if (S_ISLNK(inode->i_mode)) 2492646a1f6SSteven Whitehouse return -EOPNOTSUPP; 2502646a1f6SSteven Whitehouse 2512646a1f6SSteven Whitehouse if (!value) 2522646a1f6SSteven Whitehouse goto set_acl; 2532646a1f6SSteven Whitehouse 2542646a1f6SSteven Whitehouse acl = posix_acl_from_xattr(value, size); 2552646a1f6SSteven Whitehouse if (!acl) { 2562646a1f6SSteven Whitehouse /* 2572646a1f6SSteven Whitehouse * acl_set_file(3) may request that we set default ACLs with 2582646a1f6SSteven Whitehouse * zero length -- defend (gracefully) against that here. 2592646a1f6SSteven Whitehouse */ 2602646a1f6SSteven Whitehouse goto out; 2612646a1f6SSteven Whitehouse } 2622646a1f6SSteven Whitehouse if (IS_ERR(acl)) { 2632646a1f6SSteven Whitehouse error = PTR_ERR(acl); 2642646a1f6SSteven Whitehouse goto out; 2652646a1f6SSteven Whitehouse } 2662646a1f6SSteven Whitehouse 2672646a1f6SSteven Whitehouse error = posix_acl_valid(acl); 2682646a1f6SSteven Whitehouse if (error) 2692646a1f6SSteven Whitehouse goto out_release; 2702646a1f6SSteven Whitehouse 2712646a1f6SSteven Whitehouse error = -EINVAL; 2722646a1f6SSteven Whitehouse if (acl->a_count > GFS2_ACL_MAX_ENTRIES) 2732646a1f6SSteven Whitehouse goto out_release; 2742646a1f6SSteven Whitehouse 2752646a1f6SSteven Whitehouse if (type == ACL_TYPE_ACCESS) { 276d6952123SAl Viro umode_t mode = inode->i_mode; 2772646a1f6SSteven Whitehouse error = posix_acl_equiv_mode(acl, &mode); 2782646a1f6SSteven Whitehouse 2792646a1f6SSteven Whitehouse if (error <= 0) { 2802646a1f6SSteven Whitehouse posix_acl_release(acl); 2812646a1f6SSteven Whitehouse acl = NULL; 2822646a1f6SSteven Whitehouse 2832646a1f6SSteven Whitehouse if (error < 0) 2842646a1f6SSteven Whitehouse return error; 2852646a1f6SSteven Whitehouse } 2862646a1f6SSteven Whitehouse 2872646a1f6SSteven Whitehouse error = gfs2_set_mode(inode, mode); 2882646a1f6SSteven Whitehouse if (error) 2892646a1f6SSteven Whitehouse goto out_release; 2902646a1f6SSteven Whitehouse } 2912646a1f6SSteven Whitehouse 2922646a1f6SSteven Whitehouse set_acl: 293431547b3SChristoph Hellwig error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS); 294106381bfSSteven Whitehouse if (!error) { 295106381bfSSteven Whitehouse if (acl) 296106381bfSSteven Whitehouse set_cached_acl(inode, type, acl); 297106381bfSSteven Whitehouse else 298106381bfSSteven Whitehouse forget_cached_acl(inode, type); 299106381bfSSteven Whitehouse } 3002646a1f6SSteven Whitehouse out_release: 3012646a1f6SSteven Whitehouse posix_acl_release(acl); 3022646a1f6SSteven Whitehouse out: 3032646a1f6SSteven Whitehouse return error; 3042646a1f6SSteven Whitehouse } 3052646a1f6SSteven Whitehouse 306b7bb0a12SStephen Hemminger const struct xattr_handler gfs2_xattr_system_handler = { 3072646a1f6SSteven Whitehouse .prefix = XATTR_SYSTEM_PREFIX, 308431547b3SChristoph Hellwig .flags = GFS2_EATYPE_SYS, 3092646a1f6SSteven Whitehouse .get = gfs2_xattr_system_get, 3102646a1f6SSteven Whitehouse .set = gfs2_xattr_system_set, 3112646a1f6SSteven Whitehouse }; 3122646a1f6SSteven Whitehouse 313