Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Directory operations for Coda filesystem |
| 4 | * Original version: (C) 1996 P. Braam and M. Callahan |
| 5 | * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University |
| 6 | * |
| 7 | * Carnegie Mellon encourages users to contribute improvements to |
| 8 | * the Coda project. Contact Peter Braam (coda@cs.cmu.edu). |
| 9 | */ |
| 10 | |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/time.h> |
| 14 | #include <linux/fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/file.h> |
| 17 | #include <linux/stat.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/string.h> |
Yoshihisa Abe | b5ce1d8 | 2010-10-25 02:03:44 -0400 | [diff] [blame] | 20 | #include <linux/spinlock.h> |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 21 | #include <linux/namei.h> |
Fabian Frederick | 834b46c | 2014-08-08 14:20:33 -0700 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | #include <linux/coda.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/coda_psdev.h> |
Al Viro | 31a203d | 2011-01-12 16:36:09 -0500 | [diff] [blame] | 26 | #include "coda_linux.h" |
| 27 | #include "coda_cache.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Adrian Bunk | c98d8cf | 2006-03-24 03:15:53 -0800 | [diff] [blame] | 29 | #include "coda_int.h" |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | /* same as fs/bad_inode.c */ |
| 32 | static int coda_return_EIO(void) |
| 33 | { |
| 34 | return -EIO; |
| 35 | } |
| 36 | #define CODA_EIO_ERROR ((void *) (coda_return_EIO)) |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | /* inode operations for directories */ |
| 39 | /* access routines: lookup, readlink, permission */ |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 40 | static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
Al Viro | f4947fb | 2012-01-10 11:11:49 -0500 | [diff] [blame] | 42 | struct super_block *sb = dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | const char *name = entry->d_name.name; |
| 44 | size_t length = entry->d_name.len; |
Al Viro | f4947fb | 2012-01-10 11:11:49 -0500 | [diff] [blame] | 45 | struct inode *inode; |
| 46 | int type = 0; |
Jan Harkes | ed36f72 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 47 | |
| 48 | if (length > CODA_MAXNAMLEN) { |
Fabian Frederick | d9b4b31 | 2014-06-06 14:36:18 -0700 | [diff] [blame] | 49 | pr_err("name too long: lookup, %s (%*s)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | coda_i2s(dir), (int)length, name); |
| 51 | return ERR_PTR(-ENAMETOOLONG); |
| 52 | } |
| 53 | |
Jan Harkes | ed36f72 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 54 | /* control object, create inode on the fly */ |
Al Viro | a740022 | 2014-10-21 15:20:42 -0400 | [diff] [blame] | 55 | if (is_root_inode(dir) && coda_iscontrol(name, length)) { |
Al Viro | f4947fb | 2012-01-10 11:11:49 -0500 | [diff] [blame] | 56 | inode = coda_cnode_makectl(sb); |
Jan Harkes | ed36f72 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 57 | type = CODA_NOCACHE; |
Al Viro | f4947fb | 2012-01-10 11:11:49 -0500 | [diff] [blame] | 58 | } else { |
| 59 | struct CodaFid fid = { { 0, } }; |
| 60 | int error = venus_lookup(sb, coda_i2f(dir), name, length, |
| 61 | &type, &fid); |
| 62 | inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
| 64 | |
Al Viro | f4947fb | 2012-01-10 11:11:49 -0500 | [diff] [blame] | 65 | if (!IS_ERR(inode) && (type & CODA_NOCACHE)) |
Jan Harkes | ed36f72 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 66 | coda_flag_inode(inode, C_VATTR | C_PURGE); |
| 67 | |
Al Viro | f4947fb | 2012-01-10 11:11:49 -0500 | [diff] [blame] | 68 | if (inode == ERR_PTR(-ENOENT)) |
| 69 | inode = NULL; |
| 70 | |
Jan Harkes | ed36f72 | 2007-07-19 01:48:49 -0700 | [diff] [blame] | 71 | return d_splice_alias(inode, entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 75 | int coda_permission(struct inode *inode, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | { |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 77 | int error; |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 78 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 79 | if (mask & MAY_NOT_BLOCK) |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 80 | return -ECHILD; |
| 81 | |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 82 | mask &= MAY_READ | MAY_WRITE | MAY_EXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | if (!mask) |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 85 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Miklos Szeredi | f696a36 | 2008-07-31 13:41:58 +0200 | [diff] [blame] | 87 | if ((mask & MAY_EXEC) && !execute_ok(inode)) |
| 88 | return -EACCES; |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | if (coda_cache_check(inode, mask)) |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 91 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 93 | error = venus_access(inode->i_sb, coda_i2f(inode), mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | if (!error) |
| 96 | coda_cache_enter(inode, mask); |
| 97 | |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 98 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 102 | static inline void coda_dir_update_mtime(struct inode *dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
| 104 | #ifdef REQUERY_VENUS_FOR_MTIME |
| 105 | /* invalidate the directory cnode's attributes so we refetch the |
| 106 | * attributes from venus next time the inode is referenced */ |
| 107 | coda_flag_inode(dir, C_VATTR); |
| 108 | #else |
| 109 | /* optimistically we can also act as if our nose bleeds. The |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 110 | * granularity of the mtime is coarse anyways so we might actually be |
| 111 | * right most of the time. Note: we only do this for directories. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; |
| 113 | #endif |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a |
| 117 | * trick to fool GNU find's optimizations. If we can't be sure of the link |
| 118 | * (because of volume mount points) we set i_nlink to 1 which forces find |
| 119 | * to consider every child as a possible directory. We should also never |
| 120 | * see an increment or decrement for deleted directories where i_nlink == 0 */ |
| 121 | static inline void coda_dir_inc_nlink(struct inode *dir) |
| 122 | { |
| 123 | if (dir->i_nlink >= 2) |
| 124 | inc_nlink(dir); |
| 125 | } |
| 126 | |
| 127 | static inline void coda_dir_drop_nlink(struct inode *dir) |
| 128 | { |
| 129 | if (dir->i_nlink > 2) |
| 130 | drop_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | /* creation routines: create, mknod, mkdir, link, symlink */ |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 134 | static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 136 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | const char *name=de->d_name.name; |
| 138 | int length=de->d_name.len; |
| 139 | struct inode *inode; |
| 140 | struct CodaFid newfid; |
| 141 | struct coda_vattr attrs; |
| 142 | |
Al Viro | a740022 | 2014-10-21 15:20:42 -0400 | [diff] [blame] | 143 | if (is_root_inode(dir) && coda_iscontrol(name, length)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | error = venus_create(dir->i_sb, coda_i2f(dir), name, length, |
| 147 | 0, mode, &newfid, &attrs); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 148 | if (error) |
| 149 | goto err_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | inode = coda_iget(dir->i_sb, &newfid, &attrs); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 152 | if (IS_ERR(inode)) { |
| 153 | error = PTR_ERR(inode); |
| 154 | goto err_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | /* invalidate the directory cnode's attributes */ |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 158 | coda_dir_update_mtime(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | d_instantiate(de, inode); |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 160 | return 0; |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 161 | err_out: |
| 162 | d_drop(de); |
| 163 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 166 | static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
| 168 | struct inode *inode; |
| 169 | struct coda_vattr attrs; |
| 170 | const char *name = de->d_name.name; |
| 171 | int len = de->d_name.len; |
| 172 | int error; |
| 173 | struct CodaFid newfid; |
| 174 | |
Al Viro | a740022 | 2014-10-21 15:20:42 -0400 | [diff] [blame] | 175 | if (is_root_inode(dir) && coda_iscontrol(name, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
| 178 | attrs.va_mode = mode; |
| 179 | error = venus_mkdir(dir->i_sb, coda_i2f(dir), |
| 180 | name, len, &newfid, &attrs); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 181 | if (error) |
| 182 | goto err_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | inode = coda_iget(dir->i_sb, &newfid, &attrs); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 185 | if (IS_ERR(inode)) { |
| 186 | error = PTR_ERR(inode); |
| 187 | goto err_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | /* invalidate the directory cnode's attributes */ |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 191 | coda_dir_inc_nlink(dir); |
| 192 | coda_dir_update_mtime(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | d_instantiate(de, inode); |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 194 | return 0; |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 195 | err_out: |
| 196 | d_drop(de); |
| 197 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | /* try to make de an entry in dir_inodde linked to source_de */ |
| 201 | static int coda_link(struct dentry *source_de, struct inode *dir_inode, |
| 202 | struct dentry *de) |
| 203 | { |
| 204 | struct inode *inode = source_de->d_inode; |
| 205 | const char * name = de->d_name.name; |
| 206 | int len = de->d_name.len; |
| 207 | int error; |
| 208 | |
Al Viro | a740022 | 2014-10-21 15:20:42 -0400 | [diff] [blame] | 209 | if (is_root_inode(dir_inode) && coda_iscontrol(name, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
| 212 | error = venus_link(dir_inode->i_sb, coda_i2f(inode), |
| 213 | coda_i2f(dir_inode), (const char *)name, len); |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 214 | if (error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | d_drop(de); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 216 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 219 | coda_dir_update_mtime(dir_inode); |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 220 | ihold(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | d_instantiate(de, inode); |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 222 | inc_nlink(inode); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 223 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | |
| 227 | static int coda_symlink(struct inode *dir_inode, struct dentry *de, |
| 228 | const char *symname) |
| 229 | { |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 230 | const char *name = de->d_name.name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | int len = de->d_name.len; |
| 232 | int symlen; |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 233 | int error; |
Jan Harkes | 3cf01f2 | 2007-07-19 01:48:51 -0700 | [diff] [blame] | 234 | |
Al Viro | a740022 | 2014-10-21 15:20:42 -0400 | [diff] [blame] | 235 | if (is_root_inode(dir_inode) && coda_iscontrol(name, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | symlen = strlen(symname); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 239 | if (symlen > CODA_MAXPATHLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
| 242 | /* |
| 243 | * This entry is now negative. Since we do not create |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 244 | * an inode for the entry we have to drop it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | */ |
| 246 | d_drop(de); |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 247 | error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | symname, symlen); |
| 249 | |
| 250 | /* mtime is no good anymore */ |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 251 | if (!error) |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 252 | coda_dir_update_mtime(dir_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 254 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
| 256 | |
| 257 | /* destruction routines: unlink, rmdir */ |
Harvey Harrison | 9fe76c7 | 2008-04-29 00:58:44 -0700 | [diff] [blame] | 258 | static int coda_unlink(struct inode *dir, struct dentry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | { |
| 260 | int error; |
| 261 | const char *name = de->d_name.name; |
| 262 | int len = de->d_name.len; |
| 263 | |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 264 | error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 265 | if (error) |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 266 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 268 | coda_dir_update_mtime(dir); |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 269 | drop_nlink(de->d_inode); |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 270 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | |
Harvey Harrison | 9fe76c7 | 2008-04-29 00:58:44 -0700 | [diff] [blame] | 273 | static int coda_rmdir(struct inode *dir, struct dentry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | { |
| 275 | const char *name = de->d_name.name; |
| 276 | int len = de->d_name.len; |
Jan Harkes | 8c6d215 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 277 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); |
Jan Harkes | 8c6d215 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 280 | if (!error) { |
| 281 | /* VFS may delete the child */ |
| 282 | if (de->d_inode) |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 283 | clear_nlink(de->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Jan Harkes | 8c6d215 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 285 | /* fix the link count of the parent */ |
| 286 | coda_dir_drop_nlink(dir); |
| 287 | coda_dir_update_mtime(dir); |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 288 | } |
Jan Harkes | 8c6d215 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 289 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | /* rename */ |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 293 | static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | struct inode *new_dir, struct dentry *new_dentry) |
| 295 | { |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 296 | const char *old_name = old_dentry->d_name.name; |
| 297 | const char *new_name = new_dentry->d_name.name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | int old_length = old_dentry->d_name.len; |
| 299 | int new_length = new_dentry->d_name.len; |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 300 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 302 | error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), |
| 303 | coda_i2f(new_dir), old_length, new_length, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | (const char *) old_name, (const char *)new_name); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 305 | if (!error) { |
| 306 | if (new_dentry->d_inode) { |
| 307 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 308 | coda_dir_drop_nlink(old_dir); |
| 309 | coda_dir_inc_nlink(new_dir); |
| 310 | } |
| 311 | coda_dir_update_mtime(old_dir); |
| 312 | coda_dir_update_mtime(new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | coda_flag_inode(new_dentry->d_inode, C_VATTR); |
| 314 | } else { |
| 315 | coda_flag_inode(old_dir, C_VATTR); |
| 316 | coda_flag_inode(new_dir, C_VATTR); |
Jan Harkes | d728900 | 2007-07-19 01:48:43 -0700 | [diff] [blame] | 317 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | return error; |
| 320 | } |
| 321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | static inline unsigned int CDT2DT(unsigned char cdt) |
| 323 | { |
| 324 | unsigned int dt; |
| 325 | |
| 326 | switch(cdt) { |
| 327 | case CDT_UNKNOWN: dt = DT_UNKNOWN; break; |
| 328 | case CDT_FIFO: dt = DT_FIFO; break; |
| 329 | case CDT_CHR: dt = DT_CHR; break; |
| 330 | case CDT_DIR: dt = DT_DIR; break; |
| 331 | case CDT_BLK: dt = DT_BLK; break; |
| 332 | case CDT_REG: dt = DT_REG; break; |
| 333 | case CDT_LNK: dt = DT_LNK; break; |
| 334 | case CDT_SOCK: dt = DT_SOCK; break; |
| 335 | case CDT_WHT: dt = DT_WHT; break; |
| 336 | default: dt = DT_UNKNOWN; break; |
| 337 | } |
| 338 | return dt; |
| 339 | } |
| 340 | |
| 341 | /* support routines */ |
Al Viro | e924f25 | 2013-05-22 21:15:30 -0400 | [diff] [blame] | 342 | static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
Jan Harkes | 9787525 | 2007-07-19 01:48:47 -0700 | [diff] [blame] | 344 | struct coda_file_info *cfi; |
| 345 | struct coda_inode_info *cii; |
| 346 | struct file *host_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | struct venus_dirent *vdir; |
Al Viro | ee60498 | 2011-07-16 17:06:30 -0400 | [diff] [blame] | 348 | unsigned long vdir_size = offsetof(struct venus_dirent, d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | unsigned int type; |
| 350 | struct qstr name; |
| 351 | ino_t ino; |
Jan Harkes | 9787525 | 2007-07-19 01:48:47 -0700 | [diff] [blame] | 352 | int ret; |
| 353 | |
| 354 | cfi = CODA_FTOC(coda_file); |
| 355 | BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); |
| 356 | host_file = cfi->cfi_container; |
| 357 | |
Al Viro | 93fe74b | 2014-12-11 13:19:03 -0500 | [diff] [blame] | 358 | cii = ITOC(file_inode(coda_file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Panagiotis Issaris | f52720c | 2006-09-27 01:49:39 -0700 | [diff] [blame] | 360 | vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | if (!vdir) return -ENOMEM; |
| 362 | |
Al Viro | e924f25 | 2013-05-22 21:15:30 -0400 | [diff] [blame] | 363 | if (!dir_emit_dots(coda_file, ctx)) |
| 364 | goto out; |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | while (1) { |
| 367 | /* read entries from the directory file */ |
Al Viro | e924f25 | 2013-05-22 21:15:30 -0400 | [diff] [blame] | 368 | ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | sizeof(*vdir)); |
| 370 | if (ret < 0) { |
Fabian Frederick | 6d6bd94 | 2014-06-06 14:36:20 -0700 | [diff] [blame] | 371 | pr_err("%s: read dir %s failed %d\n", |
| 372 | __func__, coda_f2s(&cii->c_fid), ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | break; |
| 374 | } |
| 375 | if (ret == 0) break; /* end of directory file reached */ |
| 376 | |
| 377 | /* catch truncated reads */ |
| 378 | if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { |
Fabian Frederick | 6d6bd94 | 2014-06-06 14:36:20 -0700 | [diff] [blame] | 379 | pr_err("%s: short read on %s\n", |
| 380 | __func__, coda_f2s(&cii->c_fid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | ret = -EBADF; |
| 382 | break; |
| 383 | } |
| 384 | /* validate whether the directory file actually makes sense */ |
| 385 | if (vdir->d_reclen < vdir_size + vdir->d_namlen) { |
Fabian Frederick | 6d6bd94 | 2014-06-06 14:36:20 -0700 | [diff] [blame] | 386 | pr_err("%s: invalid dir %s\n", |
| 387 | __func__, coda_f2s(&cii->c_fid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | ret = -EBADF; |
| 389 | break; |
| 390 | } |
| 391 | |
| 392 | name.len = vdir->d_namlen; |
| 393 | name.name = vdir->d_name; |
| 394 | |
| 395 | /* Make sure we skip '.' and '..', we already got those */ |
| 396 | if (name.name[0] == '.' && (name.len == 1 || |
Al Viro | e924f25 | 2013-05-22 21:15:30 -0400 | [diff] [blame] | 397 | (name.name[1] == '.' && name.len == 2))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | vdir->d_fileno = name.len = 0; |
| 399 | |
| 400 | /* skip null entries */ |
| 401 | if (vdir->d_fileno && name.len) { |
Al Viro | 6b5e122 | 2013-06-19 13:21:03 +0400 | [diff] [blame] | 402 | ino = vdir->d_fileno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | type = CDT2DT(vdir->d_type); |
Al Viro | e924f25 | 2013-05-22 21:15:30 -0400 | [diff] [blame] | 404 | if (!dir_emit(ctx, name.name, name.len, ino, type)) |
| 405 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
| 407 | /* we'll always have progress because d_reclen is unsigned and |
| 408 | * we've already established it is non-zero. */ |
Al Viro | e924f25 | 2013-05-22 21:15:30 -0400 | [diff] [blame] | 409 | ctx->pos += vdir->d_reclen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
Al Viro | 5f47c7e | 2007-07-20 00:23:31 +0100 | [diff] [blame] | 411 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | kfree(vdir); |
Al Viro | e924f25 | 2013-05-22 21:15:30 -0400 | [diff] [blame] | 413 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |
| 415 | |
Fabian Frederick | b625032 | 2015-02-17 13:45:25 -0800 | [diff] [blame^] | 416 | /* file operations for directories */ |
| 417 | static int coda_readdir(struct file *coda_file, struct dir_context *ctx) |
| 418 | { |
| 419 | struct coda_file_info *cfi; |
| 420 | struct file *host_file; |
| 421 | int ret; |
| 422 | |
| 423 | cfi = CODA_FTOC(coda_file); |
| 424 | BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); |
| 425 | host_file = cfi->cfi_container; |
| 426 | |
| 427 | if (host_file->f_op->iterate) { |
| 428 | struct inode *host_inode = file_inode(host_file); |
| 429 | |
| 430 | mutex_lock(&host_inode->i_mutex); |
| 431 | ret = -ENOENT; |
| 432 | if (!IS_DEADDIR(host_inode)) { |
| 433 | ret = host_file->f_op->iterate(host_file, ctx); |
| 434 | file_accessed(host_file); |
| 435 | } |
| 436 | mutex_unlock(&host_inode->i_mutex); |
| 437 | return ret; |
| 438 | } |
| 439 | /* Venus: we must read Venus dirents from a file */ |
| 440 | return coda_venus_readdir(coda_file, ctx); |
| 441 | } |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* called when a cache lookup succeeds */ |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 444 | static int coda_dentry_revalidate(struct dentry *de, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 446 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | struct coda_inode_info *cii; |
| 448 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 449 | if (flags & LOOKUP_RCU) |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 450 | return -ECHILD; |
| 451 | |
| 452 | inode = de->d_inode; |
Al Viro | a740022 | 2014-10-21 15:20:42 -0400 | [diff] [blame] | 453 | if (!inode || is_root_inode(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | goto out; |
| 455 | if (is_bad_inode(inode)) |
| 456 | goto bad; |
| 457 | |
| 458 | cii = ITOC(de->d_inode); |
| 459 | if (!(cii->c_flags & (C_PURGE | C_FLUSH))) |
| 460 | goto out; |
| 461 | |
| 462 | shrink_dcache_parent(de); |
| 463 | |
| 464 | /* propagate for a flush */ |
| 465 | if (cii->c_flags & C_FLUSH) |
| 466 | coda_flag_inode_children(inode, C_FLUSH); |
| 467 | |
Al Viro | 84d08fa | 2013-07-05 18:59:33 +0400 | [diff] [blame] | 468 | if (d_count(de) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | /* pretend it's valid, but don't change the flags */ |
| 470 | goto out; |
| 471 | |
| 472 | /* clear the flags. */ |
Yoshihisa Abe | b5ce1d8 | 2010-10-25 02:03:44 -0400 | [diff] [blame] | 473 | spin_lock(&cii->c_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); |
Yoshihisa Abe | b5ce1d8 | 2010-10-25 02:03:44 -0400 | [diff] [blame] | 475 | spin_unlock(&cii->c_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | bad: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return 0; |
| 478 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | return 1; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * This is the callback from dput() when d_count is going to 0. |
| 484 | * We use this to unhash dentries with bad inodes. |
| 485 | */ |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 486 | static int coda_dentry_delete(const struct dentry * dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
| 488 | int flags; |
| 489 | |
| 490 | if (!dentry->d_inode) |
| 491 | return 0; |
| 492 | |
| 493 | flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; |
| 494 | if (is_bad_inode(dentry->d_inode) || flags) { |
| 495 | return 1; |
| 496 | } |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | |
| 501 | |
| 502 | /* |
| 503 | * This is called when we want to check if the inode has |
| 504 | * changed on the server. Coda makes this easy since the |
| 505 | * cache manager Venus issues a downcall to the kernel when this |
| 506 | * happens |
| 507 | */ |
Al Viro | 11d100d | 2013-10-04 18:17:02 -0400 | [diff] [blame] | 508 | int coda_revalidate_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | { |
| 510 | struct coda_vattr attr; |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 511 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | int old_mode; |
| 513 | ino_t old_ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | struct coda_inode_info *cii = ITOC(inode); |
| 515 | |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 516 | if (!cii->c_flags) |
| 517 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { |
| 520 | error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 521 | if (error) |
| 522 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
| 524 | /* this inode may be lost if: |
| 525 | - it's ino changed |
| 526 | - type changes must be permitted for repair and |
| 527 | missing mount points. |
| 528 | */ |
| 529 | old_mode = inode->i_mode; |
| 530 | old_ino = inode->i_ino; |
| 531 | coda_vattr_to_iattr(inode, &attr); |
| 532 | |
| 533 | if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { |
Fabian Frederick | f38cfb2 | 2014-06-06 14:36:19 -0700 | [diff] [blame] | 534 | pr_warn("inode %ld, fid %s changed type!\n", |
Fabian Frederick | d9b4b31 | 2014-06-06 14:36:18 -0700 | [diff] [blame] | 535 | inode->i_ino, coda_f2s(&(cii->c_fid))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | /* the following can happen when a local fid is replaced |
| 539 | with a global one, here we lose and declare the inode bad */ |
| 540 | if (inode->i_ino != old_ino) |
Yoshihisa Abe | f7cc02b8 | 2010-10-25 02:03:45 -0400 | [diff] [blame] | 541 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
| 543 | coda_flag_inode_children(inode, C_FLUSH); |
Yoshihisa Abe | b5ce1d8 | 2010-10-25 02:03:44 -0400 | [diff] [blame] | 544 | |
| 545 | spin_lock(&cii->c_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); |
Yoshihisa Abe | b5ce1d8 | 2010-10-25 02:03:44 -0400 | [diff] [blame] | 547 | spin_unlock(&cii->c_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
Fabian Frederick | b625032 | 2015-02-17 13:45:25 -0800 | [diff] [blame^] | 551 | |
| 552 | const struct dentry_operations coda_dentry_operations = { |
| 553 | .d_revalidate = coda_dentry_revalidate, |
| 554 | .d_delete = coda_dentry_delete, |
| 555 | }; |
| 556 | |
| 557 | const struct inode_operations coda_dir_inode_operations = { |
| 558 | .create = coda_create, |
| 559 | .lookup = coda_lookup, |
| 560 | .link = coda_link, |
| 561 | .unlink = coda_unlink, |
| 562 | .symlink = coda_symlink, |
| 563 | .mkdir = coda_mkdir, |
| 564 | .rmdir = coda_rmdir, |
| 565 | .mknod = CODA_EIO_ERROR, |
| 566 | .rename = coda_rename, |
| 567 | .permission = coda_permission, |
| 568 | .getattr = coda_getattr, |
| 569 | .setattr = coda_setattr, |
| 570 | }; |
| 571 | |
| 572 | const struct file_operations coda_dir_operations = { |
| 573 | .llseek = generic_file_llseek, |
| 574 | .read = generic_read_dir, |
| 575 | .iterate = coda_readdir, |
| 576 | .open = coda_open, |
| 577 | .release = coda_release, |
| 578 | .fsync = coda_fsync, |
| 579 | }; |