Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1 | #include <linux/ceph/ceph_debug.h> |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 2 | |
| 3 | #include <linux/spinlock.h> |
| 4 | #include <linux/fs_struct.h> |
| 5 | #include <linux/namei.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 6 | #include <linux/slab.h> |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 7 | #include <linux/sched.h> |
| 8 | |
| 9 | #include "super.h" |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 10 | #include "mds_client.h" |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 11 | |
| 12 | /* |
| 13 | * Directory operations: readdir, lookup, create, link, unlink, |
| 14 | * rename, etc. |
| 15 | */ |
| 16 | |
| 17 | /* |
| 18 | * Ceph MDS operations are specified in terms of a base ino and |
| 19 | * relative path. Thus, the client can specify an operation on a |
| 20 | * specific inode (e.g., a getattr due to fstat(2)), or as a path |
| 21 | * relative to, say, the root directory. |
| 22 | * |
| 23 | * Normally, we limit ourselves to strict inode ops (no path component) |
| 24 | * or dentry operations (a single path component relative to an ino). The |
| 25 | * exception to this is open_root_dentry(), which will open the mount |
| 26 | * point by name. |
| 27 | */ |
| 28 | |
| 29 | const struct inode_operations ceph_dir_iops; |
| 30 | const struct file_operations ceph_dir_fops; |
Sage Weil | 52dfb8a | 2010-08-03 10:25:30 -0700 | [diff] [blame] | 31 | const struct dentry_operations ceph_dentry_ops; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 32 | |
| 33 | /* |
| 34 | * Initialize ceph dentry state. |
| 35 | */ |
| 36 | int ceph_init_dentry(struct dentry *dentry) |
| 37 | { |
| 38 | struct ceph_dentry_info *di; |
| 39 | |
| 40 | if (dentry->d_fsdata) |
| 41 | return 0; |
| 42 | |
Sage Weil | 36e2168 | 2010-08-24 16:23:48 -0700 | [diff] [blame] | 43 | di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 44 | if (!di) |
| 45 | return -ENOMEM; /* oh well */ |
| 46 | |
| 47 | spin_lock(&dentry->d_lock); |
Sage Weil | 8c6efb5 | 2010-04-23 11:36:54 -0700 | [diff] [blame] | 48 | if (dentry->d_fsdata) { |
| 49 | /* lost a race */ |
| 50 | kmem_cache_free(ceph_dentry_cachep, di); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 51 | goto out_unlock; |
Sage Weil | 8c6efb5 | 2010-04-23 11:36:54 -0700 | [diff] [blame] | 52 | } |
Sage Weil | 48d0cbd | 2011-07-26 11:30:15 -0700 | [diff] [blame] | 53 | |
| 54 | if (dentry->d_parent == NULL || /* nfs fh_to_dentry */ |
| 55 | ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) |
| 56 | d_set_d_op(dentry, &ceph_dentry_ops); |
| 57 | else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) |
| 58 | d_set_d_op(dentry, &ceph_snapdir_dentry_ops); |
| 59 | else |
| 60 | d_set_d_op(dentry, &ceph_snap_dentry_ops); |
| 61 | |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 62 | di->dentry = dentry; |
| 63 | di->lease_session = NULL; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 64 | dentry->d_time = jiffies; |
Sage Weil | 48d0cbd | 2011-07-26 11:30:15 -0700 | [diff] [blame] | 65 | /* avoid reordering d_fsdata setup so that the check above is safe */ |
| 66 | smp_mb(); |
| 67 | dentry->d_fsdata = di; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 68 | ceph_dentry_lru_add(dentry); |
| 69 | out_unlock: |
| 70 | spin_unlock(&dentry->d_lock); |
| 71 | return 0; |
| 72 | } |
| 73 | |
Sage Weil | 5f21c96 | 2011-07-26 11:30:29 -0700 | [diff] [blame^] | 74 | struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) |
| 75 | { |
| 76 | struct inode *inode = NULL; |
| 77 | |
| 78 | if (!dentry) |
| 79 | return NULL; |
| 80 | |
| 81 | spin_lock(&dentry->d_lock); |
| 82 | if (dentry->d_parent) { |
| 83 | inode = dentry->d_parent->d_inode; |
| 84 | ihold(inode); |
| 85 | } |
| 86 | spin_unlock(&dentry->d_lock); |
| 87 | return inode; |
| 88 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 89 | |
| 90 | |
| 91 | /* |
| 92 | * for readdir, we encode the directory frag and offset within that |
| 93 | * frag into f_pos. |
| 94 | */ |
| 95 | static unsigned fpos_frag(loff_t p) |
| 96 | { |
| 97 | return p >> 32; |
| 98 | } |
| 99 | static unsigned fpos_off(loff_t p) |
| 100 | { |
| 101 | return p & 0xffffffff; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * When possible, we try to satisfy a readdir by peeking at the |
| 106 | * dcache. We make this work by carefully ordering dentries on |
| 107 | * d_u.d_child when we initially get results back from the MDS, and |
| 108 | * falling back to a "normal" sync readdir if any dentries in the dir |
| 109 | * are dropped. |
| 110 | * |
| 111 | * I_COMPLETE tells indicates we have all dentries in the dir. It is |
| 112 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
| 113 | * the MDS if/when the directory is modified). |
| 114 | */ |
| 115 | static int __dcache_readdir(struct file *filp, |
| 116 | void *dirent, filldir_t filldir) |
| 117 | { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 118 | struct ceph_file_info *fi = filp->private_data; |
| 119 | struct dentry *parent = filp->f_dentry; |
| 120 | struct inode *dir = parent->d_inode; |
| 121 | struct list_head *p; |
| 122 | struct dentry *dentry, *last; |
| 123 | struct ceph_dentry_info *di; |
| 124 | int err = 0; |
| 125 | |
| 126 | /* claim ref on last dentry we returned */ |
| 127 | last = fi->dentry; |
| 128 | fi->dentry = NULL; |
| 129 | |
| 130 | dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, |
| 131 | last); |
| 132 | |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 133 | spin_lock(&parent->d_lock); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 134 | |
| 135 | /* start at beginning? */ |
Sage Weil | 884ea89 | 2010-11-22 22:58:06 -0800 | [diff] [blame] | 136 | if (filp->f_pos == 2 || last == NULL || |
| 137 | filp->f_pos < ceph_dentry(last)->offset) { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 138 | if (list_empty(&parent->d_subdirs)) |
| 139 | goto out_unlock; |
| 140 | p = parent->d_subdirs.prev; |
| 141 | dout(" initial p %p/%p\n", p->prev, p->next); |
| 142 | } else { |
| 143 | p = last->d_u.d_child.prev; |
| 144 | } |
| 145 | |
| 146 | more: |
| 147 | dentry = list_entry(p, struct dentry, d_u.d_child); |
| 148 | di = ceph_dentry(dentry); |
| 149 | while (1) { |
Sage Weil | 1cd3935 | 2010-05-03 22:08:02 -0700 | [diff] [blame] | 150 | dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, |
| 151 | d_unhashed(dentry) ? "!hashed" : "hashed", |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 152 | parent->d_subdirs.prev, parent->d_subdirs.next); |
| 153 | if (p == &parent->d_subdirs) { |
Sage Weil | 9cfa109 | 2011-07-26 11:26:18 -0700 | [diff] [blame] | 154 | fi->flags |= CEPH_F_ATEND; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 155 | goto out_unlock; |
| 156 | } |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 157 | spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 158 | if (!d_unhashed(dentry) && dentry->d_inode && |
Sage Weil | 09b8a7d | 2009-11-11 15:21:27 -0800 | [diff] [blame] | 159 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
Sage Weil | 1d1de916 | 2009-12-02 11:54:25 -0800 | [diff] [blame] | 160 | ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 161 | filp->f_pos <= di->offset) |
| 162 | break; |
| 163 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, |
| 164 | dentry->d_name.len, dentry->d_name.name, di->offset, |
| 165 | filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", |
| 166 | !dentry->d_inode ? " null" : ""); |
Nick Piggin | da50295 | 2011-01-07 17:49:33 +1100 | [diff] [blame] | 167 | spin_unlock(&dentry->d_lock); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 168 | p = p->prev; |
| 169 | dentry = list_entry(p, struct dentry, d_u.d_child); |
| 170 | di = ceph_dentry(dentry); |
| 171 | } |
| 172 | |
Nick Piggin | da50295 | 2011-01-07 17:49:33 +1100 | [diff] [blame] | 173 | dget_dlock(dentry); |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 174 | spin_unlock(&dentry->d_lock); |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 175 | spin_unlock(&parent->d_lock); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 176 | |
| 177 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, |
| 178 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); |
| 179 | filp->f_pos = di->offset; |
| 180 | err = filldir(dirent, dentry->d_name.name, |
| 181 | dentry->d_name.len, di->offset, |
Yehuda Sadeh | ad1fee9 | 2011-01-21 16:44:03 -0800 | [diff] [blame] | 182 | ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 183 | dentry->d_inode->i_mode >> 12); |
| 184 | |
| 185 | if (last) { |
| 186 | if (err < 0) { |
| 187 | /* remember our position */ |
| 188 | fi->dentry = last; |
| 189 | fi->next_offset = di->offset; |
| 190 | } else { |
| 191 | dput(last); |
| 192 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 193 | } |
Sage Weil | f5b0662 | 2010-04-12 14:24:28 -0700 | [diff] [blame] | 194 | last = dentry; |
| 195 | |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 196 | if (err < 0) |
Sage Weil | efa4c12 | 2010-10-18 14:04:31 -0700 | [diff] [blame] | 197 | goto out; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 198 | |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 199 | filp->f_pos++; |
| 200 | |
Nick Piggin | b5c84bf | 2011-01-07 17:49:38 +1100 | [diff] [blame] | 201 | /* make sure a dentry wasn't dropped while we didn't have parent lock */ |
Sage Weil | efa4c12 | 2010-10-18 14:04:31 -0700 | [diff] [blame] | 202 | if (!ceph_i_test(dir, CEPH_I_COMPLETE)) { |
| 203 | dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); |
| 204 | err = -EAGAIN; |
| 205 | goto out; |
| 206 | } |
| 207 | |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 208 | spin_lock(&parent->d_lock); |
Sage Weil | efa4c12 | 2010-10-18 14:04:31 -0700 | [diff] [blame] | 209 | p = p->prev; /* advance to next dentry */ |
| 210 | goto more; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 211 | |
| 212 | out_unlock: |
Nick Piggin | 2fd6b7f | 2011-01-07 17:49:34 +1100 | [diff] [blame] | 213 | spin_unlock(&parent->d_lock); |
Sage Weil | efa4c12 | 2010-10-18 14:04:31 -0700 | [diff] [blame] | 214 | out: |
| 215 | if (last) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 216 | dput(last); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 217 | return err; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * make note of the last dentry we read, so we can |
| 222 | * continue at the same lexicographical point, |
| 223 | * regardless of what dir changes take place on the |
| 224 | * server. |
| 225 | */ |
| 226 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, |
| 227 | int len) |
| 228 | { |
| 229 | kfree(fi->last_name); |
| 230 | fi->last_name = kmalloc(len+1, GFP_NOFS); |
| 231 | if (!fi->last_name) |
| 232 | return -ENOMEM; |
| 233 | memcpy(fi->last_name, name, len); |
| 234 | fi->last_name[len] = 0; |
| 235 | dout("note_last_dentry '%s'\n", fi->last_name); |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 240 | { |
| 241 | struct ceph_file_info *fi = filp->private_data; |
| 242 | struct inode *inode = filp->f_dentry->d_inode; |
| 243 | struct ceph_inode_info *ci = ceph_inode(inode); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 244 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 245 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 246 | unsigned frag = fpos_frag(filp->f_pos); |
| 247 | int off = fpos_off(filp->f_pos); |
| 248 | int err; |
| 249 | u32 ftype; |
| 250 | struct ceph_mds_reply_info_parsed *rinfo; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 251 | const int max_entries = fsc->mount_options->max_readdir; |
| 252 | const int max_bytes = fsc->mount_options->max_readdir_bytes; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 253 | |
| 254 | dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); |
Sage Weil | 9cfa109 | 2011-07-26 11:26:18 -0700 | [diff] [blame] | 255 | if (fi->flags & CEPH_F_ATEND) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 256 | return 0; |
| 257 | |
| 258 | /* always start with . and .. */ |
| 259 | if (filp->f_pos == 0) { |
| 260 | /* note dir version at start of readdir so we can tell |
| 261 | * if any dentries get dropped */ |
| 262 | fi->dir_release_count = ci->i_release_count; |
| 263 | |
| 264 | dout("readdir off 0 -> '.'\n"); |
| 265 | if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), |
Yehuda Sadeh | ad1fee9 | 2011-01-21 16:44:03 -0800 | [diff] [blame] | 266 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
| 267 | inode->i_mode >> 12) < 0) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 268 | return 0; |
| 269 | filp->f_pos = 1; |
| 270 | off = 1; |
| 271 | } |
| 272 | if (filp->f_pos == 1) { |
Yehuda Sadeh | ad1fee9 | 2011-01-21 16:44:03 -0800 | [diff] [blame] | 273 | ino_t ino = filp->f_dentry->d_parent->d_inode->i_ino; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 274 | dout("readdir off 1 -> '..'\n"); |
| 275 | if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), |
Yehuda Sadeh | ad1fee9 | 2011-01-21 16:44:03 -0800 | [diff] [blame] | 276 | ceph_translate_ino(inode->i_sb, ino), |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 277 | inode->i_mode >> 12) < 0) |
| 278 | return 0; |
| 279 | filp->f_pos = 2; |
| 280 | off = 2; |
| 281 | } |
| 282 | |
| 283 | /* can we use the dcache? */ |
| 284 | spin_lock(&inode->i_lock); |
| 285 | if ((filp->f_pos == 2 || fi->dentry) && |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 286 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
Sage Weil | a0dff78 | 2010-07-22 13:47:21 -0700 | [diff] [blame] | 287 | ceph_snap(inode) != CEPH_SNAPDIR && |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 288 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && |
| 289 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
Sage Weil | efa4c12 | 2010-10-18 14:04:31 -0700 | [diff] [blame] | 290 | spin_unlock(&inode->i_lock); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 291 | err = __dcache_readdir(filp, dirent, filldir); |
Sage Weil | efa4c12 | 2010-10-18 14:04:31 -0700 | [diff] [blame] | 292 | if (err != -EAGAIN) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 293 | return err; |
Sage Weil | efa4c12 | 2010-10-18 14:04:31 -0700 | [diff] [blame] | 294 | } else { |
| 295 | spin_unlock(&inode->i_lock); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 296 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 297 | if (fi->dentry) { |
| 298 | err = note_last_dentry(fi, fi->dentry->d_name.name, |
| 299 | fi->dentry->d_name.len); |
| 300 | if (err) |
| 301 | return err; |
| 302 | dput(fi->dentry); |
| 303 | fi->dentry = NULL; |
| 304 | } |
| 305 | |
| 306 | /* proceed with a normal readdir */ |
| 307 | |
| 308 | more: |
| 309 | /* do we have the correct frag content buffered? */ |
| 310 | if (fi->frag != frag || fi->last_readdir == NULL) { |
| 311 | struct ceph_mds_request *req; |
| 312 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? |
| 313 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; |
| 314 | |
| 315 | /* discard old result, if any */ |
Sage Weil | 393f662 | 2010-03-10 12:03:32 -0800 | [diff] [blame] | 316 | if (fi->last_readdir) { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 317 | ceph_mdsc_put_request(fi->last_readdir); |
Sage Weil | 393f662 | 2010-03-10 12:03:32 -0800 | [diff] [blame] | 318 | fi->last_readdir = NULL; |
| 319 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 320 | |
| 321 | /* requery frag tree, as the frag topology may have changed */ |
| 322 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); |
| 323 | |
| 324 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
| 325 | ceph_vinop(inode), frag, fi->last_name); |
| 326 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
| 327 | if (IS_ERR(req)) |
| 328 | return PTR_ERR(req); |
Sage Weil | 70b666c | 2011-05-27 09:24:26 -0700 | [diff] [blame] | 329 | req->r_inode = inode; |
| 330 | ihold(inode); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 331 | req->r_dentry = dget(filp->f_dentry); |
| 332 | /* hints to request -> mds selection code */ |
| 333 | req->r_direct_mode = USE_AUTH_MDS; |
| 334 | req->r_direct_hash = ceph_frag_value(frag); |
| 335 | req->r_direct_is_hash = true; |
| 336 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); |
| 337 | req->r_readdir_offset = fi->next_offset; |
| 338 | req->r_args.readdir.frag = cpu_to_le32(frag); |
| 339 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); |
Sage Weil | 23804d9 | 2010-05-14 13:06:30 -0700 | [diff] [blame] | 340 | req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); |
Yehuda Sadeh | e1e4dd0 | 2010-04-13 11:45:56 -0700 | [diff] [blame] | 341 | req->r_num_caps = max_entries + 1; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 342 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
| 343 | if (err < 0) { |
| 344 | ceph_mdsc_put_request(req); |
| 345 | return err; |
| 346 | } |
| 347 | dout("readdir got and parsed readdir result=%d" |
| 348 | " on frag %x, end=%d, complete=%d\n", err, frag, |
| 349 | (int)req->r_reply_info.dir_end, |
| 350 | (int)req->r_reply_info.dir_complete); |
| 351 | |
| 352 | if (!req->r_did_prepopulate) { |
| 353 | dout("readdir !did_prepopulate"); |
| 354 | fi->dir_release_count--; /* preclude I_COMPLETE */ |
| 355 | } |
| 356 | |
| 357 | /* note next offset and last dentry name */ |
| 358 | fi->offset = fi->next_offset; |
| 359 | fi->last_readdir = req; |
| 360 | |
| 361 | if (req->r_reply_info.dir_end) { |
| 362 | kfree(fi->last_name); |
| 363 | fi->last_name = NULL; |
Sage Weil | 7b88dad | 2010-11-11 16:48:59 -0800 | [diff] [blame] | 364 | if (ceph_frag_is_rightmost(frag)) |
| 365 | fi->next_offset = 2; |
| 366 | else |
| 367 | fi->next_offset = 0; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 368 | } else { |
| 369 | rinfo = &req->r_reply_info; |
| 370 | err = note_last_dentry(fi, |
| 371 | rinfo->dir_dname[rinfo->dir_nr-1], |
| 372 | rinfo->dir_dname_len[rinfo->dir_nr-1]); |
| 373 | if (err) |
| 374 | return err; |
| 375 | fi->next_offset += rinfo->dir_nr; |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | rinfo = &fi->last_readdir->r_reply_info; |
| 380 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, |
| 381 | rinfo->dir_nr, off, fi->offset); |
Sage Weil | da39822 | 2011-05-12 15:28:11 -0700 | [diff] [blame] | 382 | while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 383 | u64 pos = ceph_make_fpos(frag, off); |
| 384 | struct ceph_mds_reply_inode *in = |
| 385 | rinfo->dir_in[off - fi->offset].in; |
Sage Weil | 3105c19 | 2010-11-18 09:15:07 -0800 | [diff] [blame] | 386 | struct ceph_vino vino; |
| 387 | ino_t ino; |
| 388 | |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 389 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
| 390 | off, off - fi->offset, rinfo->dir_nr, pos, |
| 391 | rinfo->dir_dname_len[off - fi->offset], |
| 392 | rinfo->dir_dname[off - fi->offset], in); |
| 393 | BUG_ON(!in); |
| 394 | ftype = le32_to_cpu(in->mode) >> 12; |
Sage Weil | 3105c19 | 2010-11-18 09:15:07 -0800 | [diff] [blame] | 395 | vino.ino = le64_to_cpu(in->ino); |
| 396 | vino.snap = le64_to_cpu(in->snapid); |
| 397 | ino = ceph_vino_to_ino(vino); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 398 | if (filldir(dirent, |
| 399 | rinfo->dir_dname[off - fi->offset], |
| 400 | rinfo->dir_dname_len[off - fi->offset], |
Yehuda Sadeh | ad1fee9 | 2011-01-21 16:44:03 -0800 | [diff] [blame] | 401 | pos, |
| 402 | ceph_translate_ino(inode->i_sb, ino), ftype) < 0) { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 403 | dout("filldir stopping us...\n"); |
| 404 | return 0; |
| 405 | } |
| 406 | off++; |
| 407 | filp->f_pos = pos + 1; |
| 408 | } |
| 409 | |
| 410 | if (fi->last_name) { |
| 411 | ceph_mdsc_put_request(fi->last_readdir); |
| 412 | fi->last_readdir = NULL; |
| 413 | goto more; |
| 414 | } |
| 415 | |
| 416 | /* more frags? */ |
| 417 | if (!ceph_frag_is_rightmost(frag)) { |
| 418 | frag = ceph_frag_next(frag); |
| 419 | off = 0; |
| 420 | filp->f_pos = ceph_make_fpos(frag, off); |
| 421 | dout("readdir next frag is %x\n", frag); |
| 422 | goto more; |
| 423 | } |
Sage Weil | 9cfa109 | 2011-07-26 11:26:18 -0700 | [diff] [blame] | 424 | fi->flags |= CEPH_F_ATEND; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 425 | |
| 426 | /* |
| 427 | * if dir_release_count still matches the dir, no dentries |
| 428 | * were released during the whole readdir, and we should have |
| 429 | * the complete dir contents in our cache. |
| 430 | */ |
| 431 | spin_lock(&inode->i_lock); |
| 432 | if (ci->i_release_count == fi->dir_release_count) { |
| 433 | dout(" marking %p complete\n", inode); |
Sage Weil | b545cc1 | 2011-02-28 12:46:46 -0800 | [diff] [blame] | 434 | /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */ |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 435 | ci->i_max_offset = filp->f_pos; |
| 436 | } |
| 437 | spin_unlock(&inode->i_lock); |
| 438 | |
| 439 | dout("readdir %p filp %p done.\n", inode, filp); |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | static void reset_readdir(struct ceph_file_info *fi) |
| 444 | { |
| 445 | if (fi->last_readdir) { |
| 446 | ceph_mdsc_put_request(fi->last_readdir); |
| 447 | fi->last_readdir = NULL; |
| 448 | } |
| 449 | kfree(fi->last_name); |
Sage Weil | a1629c3 | 2010-11-11 15:24:06 -0800 | [diff] [blame] | 450 | fi->last_name = NULL; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 451 | fi->next_offset = 2; /* compensate for . and .. */ |
| 452 | if (fi->dentry) { |
| 453 | dput(fi->dentry); |
| 454 | fi->dentry = NULL; |
| 455 | } |
Sage Weil | 9cfa109 | 2011-07-26 11:26:18 -0700 | [diff] [blame] | 456 | fi->flags &= ~CEPH_F_ATEND; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) |
| 460 | { |
| 461 | struct ceph_file_info *fi = file->private_data; |
| 462 | struct inode *inode = file->f_mapping->host; |
| 463 | loff_t old_offset = offset; |
| 464 | loff_t retval; |
| 465 | |
| 466 | mutex_lock(&inode->i_mutex); |
| 467 | switch (origin) { |
| 468 | case SEEK_END: |
| 469 | offset += inode->i_size + 2; /* FIXME */ |
| 470 | break; |
| 471 | case SEEK_CUR: |
| 472 | offset += file->f_pos; |
| 473 | } |
| 474 | retval = -EINVAL; |
| 475 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { |
| 476 | if (offset != file->f_pos) { |
| 477 | file->f_pos = offset; |
| 478 | file->f_version = 0; |
Sage Weil | 9cfa109 | 2011-07-26 11:26:18 -0700 | [diff] [blame] | 479 | fi->flags &= ~CEPH_F_ATEND; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 480 | } |
| 481 | retval = offset; |
| 482 | |
| 483 | /* |
| 484 | * discard buffered readdir content on seekdir(0), or |
| 485 | * seek to new frag, or seek prior to current chunk. |
| 486 | */ |
| 487 | if (offset == 0 || |
| 488 | fpos_frag(offset) != fpos_frag(old_offset) || |
| 489 | fpos_off(offset) < fi->offset) { |
| 490 | dout("dir_llseek dropping %p content\n", file); |
| 491 | reset_readdir(fi); |
| 492 | } |
| 493 | |
| 494 | /* bump dir_release_count if we did a forward seek */ |
| 495 | if (offset > old_offset) |
| 496 | fi->dir_release_count--; |
| 497 | } |
| 498 | mutex_unlock(&inode->i_mutex); |
| 499 | return retval; |
| 500 | } |
| 501 | |
| 502 | /* |
Sage Weil | 468640e | 2011-07-26 11:28:11 -0700 | [diff] [blame] | 503 | * Handle lookups for the hidden .snap directory. |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 504 | */ |
Sage Weil | 468640e | 2011-07-26 11:28:11 -0700 | [diff] [blame] | 505 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
| 506 | struct dentry *dentry, int err) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 507 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 508 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 509 | struct inode *parent = dentry->d_parent->d_inode; |
| 510 | |
| 511 | /* .snap dir? */ |
| 512 | if (err == -ENOENT && |
Sage Weil | 455cec0 | 2011-03-03 13:44:35 -0800 | [diff] [blame] | 513 | ceph_snap(parent) == CEPH_NOSNAP && |
Sage Weil | 6b80518 | 2009-10-27 11:50:50 -0700 | [diff] [blame] | 514 | strcmp(dentry->d_name.name, |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 515 | fsc->mount_options->snapdir_name) == 0) { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 516 | struct inode *inode = ceph_get_snapdir(parent); |
| 517 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", |
| 518 | dentry, dentry->d_name.len, dentry->d_name.name, inode); |
Sage Weil | 9358c6d | 2010-03-30 13:54:41 -0700 | [diff] [blame] | 519 | BUG_ON(!d_unhashed(dentry)); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 520 | d_add(dentry, inode); |
| 521 | err = 0; |
| 522 | } |
Sage Weil | 468640e | 2011-07-26 11:28:11 -0700 | [diff] [blame] | 523 | return err; |
| 524 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 525 | |
Sage Weil | 468640e | 2011-07-26 11:28:11 -0700 | [diff] [blame] | 526 | /* |
| 527 | * Figure out final result of a lookup/open request. |
| 528 | * |
| 529 | * Mainly, make sure we return the final req->r_dentry (if it already |
| 530 | * existed) in place of the original VFS-provided dentry when they |
| 531 | * differ. |
| 532 | * |
| 533 | * Gracefully handle the case where the MDS replies with -ENOENT and |
| 534 | * no trace (which it may do, at its discretion, e.g., if it doesn't |
| 535 | * care to issue a lease on the negative dentry). |
| 536 | */ |
| 537 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, |
| 538 | struct dentry *dentry, int err) |
| 539 | { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 540 | if (err == -ENOENT) { |
| 541 | /* no trace? */ |
| 542 | err = 0; |
| 543 | if (!req->r_reply_info.head->is_dentry) { |
| 544 | dout("ENOENT and no trace, dentry %p inode %p\n", |
| 545 | dentry, dentry->d_inode); |
| 546 | if (dentry->d_inode) { |
| 547 | d_drop(dentry); |
| 548 | err = -ENOENT; |
| 549 | } else { |
| 550 | d_add(dentry, NULL); |
| 551 | } |
| 552 | } |
| 553 | } |
| 554 | if (err) |
| 555 | dentry = ERR_PTR(err); |
| 556 | else if (dentry != req->r_dentry) |
| 557 | dentry = dget(req->r_dentry); /* we got spliced */ |
| 558 | else |
| 559 | dentry = NULL; |
| 560 | return dentry; |
| 561 | } |
| 562 | |
Sage Weil | 1d1de916 | 2009-12-02 11:54:25 -0800 | [diff] [blame] | 563 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
| 564 | { |
| 565 | return ceph_ino(inode) == CEPH_INO_ROOT && |
| 566 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; |
| 567 | } |
| 568 | |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 569 | /* |
| 570 | * Look up a single dir entry. If there is a lookup intent, inform |
| 571 | * the MDS so that it gets our 'caps wanted' value in a single op. |
| 572 | */ |
| 573 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, |
| 574 | struct nameidata *nd) |
| 575 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 576 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| 577 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 578 | struct ceph_mds_request *req; |
| 579 | int op; |
| 580 | int err; |
| 581 | |
| 582 | dout("lookup %p dentry %p '%.*s'\n", |
| 583 | dir, dentry, dentry->d_name.len, dentry->d_name.name); |
| 584 | |
| 585 | if (dentry->d_name.len > NAME_MAX) |
| 586 | return ERR_PTR(-ENAMETOOLONG); |
| 587 | |
| 588 | err = ceph_init_dentry(dentry); |
| 589 | if (err < 0) |
| 590 | return ERR_PTR(err); |
| 591 | |
| 592 | /* open (but not create!) intent? */ |
| 593 | if (nd && |
| 594 | (nd->flags & LOOKUP_OPEN) && |
| 595 | (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */ |
| 596 | !(nd->intent.open.flags & O_CREAT)) { |
| 597 | int mode = nd->intent.open.create_mode & ~current->fs->umask; |
| 598 | return ceph_lookup_open(dir, dentry, nd, mode, 1); |
| 599 | } |
| 600 | |
| 601 | /* can we conclude ENOENT locally? */ |
| 602 | if (dentry->d_inode == NULL) { |
| 603 | struct ceph_inode_info *ci = ceph_inode(dir); |
| 604 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
| 605 | |
| 606 | spin_lock(&dir->i_lock); |
| 607 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
| 608 | if (strncmp(dentry->d_name.name, |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 609 | fsc->mount_options->snapdir_name, |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 610 | dentry->d_name.len) && |
Sage Weil | 1d1de916 | 2009-12-02 11:54:25 -0800 | [diff] [blame] | 611 | !is_root_ceph_dentry(dir, dentry) && |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 612 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && |
| 613 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 614 | spin_unlock(&dir->i_lock); |
| 615 | dout(" dir %p complete, -ENOENT\n", dir); |
| 616 | d_add(dentry, NULL); |
| 617 | di->lease_shared_gen = ci->i_shared_gen; |
| 618 | return NULL; |
| 619 | } |
| 620 | spin_unlock(&dir->i_lock); |
| 621 | } |
| 622 | |
| 623 | op = ceph_snap(dir) == CEPH_SNAPDIR ? |
| 624 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; |
| 625 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); |
| 626 | if (IS_ERR(req)) |
Julia Lawall | 7e34bc5 | 2010-05-22 12:01:14 +0200 | [diff] [blame] | 627 | return ERR_CAST(req); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 628 | req->r_dentry = dget(dentry); |
| 629 | req->r_num_caps = 2; |
| 630 | /* we only need inode linkage */ |
| 631 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); |
| 632 | req->r_locked_dir = dir; |
| 633 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
Sage Weil | 468640e | 2011-07-26 11:28:11 -0700 | [diff] [blame] | 634 | err = ceph_handle_snapdir(req, dentry, err); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 635 | dentry = ceph_finish_lookup(req, dentry, err); |
| 636 | ceph_mdsc_put_request(req); /* will dput(dentry) */ |
| 637 | dout("lookup result=%p\n", dentry); |
| 638 | return dentry; |
| 639 | } |
| 640 | |
| 641 | /* |
| 642 | * If we do a create but get no trace back from the MDS, follow up with |
| 643 | * a lookup (the VFS expects us to link up the provided dentry). |
| 644 | */ |
| 645 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) |
| 646 | { |
| 647 | struct dentry *result = ceph_lookup(dir, dentry, NULL); |
| 648 | |
| 649 | if (result && !IS_ERR(result)) { |
| 650 | /* |
| 651 | * We created the item, then did a lookup, and found |
| 652 | * it was already linked to another inode we already |
| 653 | * had in our cache (and thus got spliced). Link our |
| 654 | * dentry to that inode, but don't hash it, just in |
| 655 | * case the VFS wants to dereference it. |
| 656 | */ |
| 657 | BUG_ON(!result->d_inode); |
| 658 | d_instantiate(dentry, result->d_inode); |
| 659 | return 0; |
| 660 | } |
| 661 | return PTR_ERR(result); |
| 662 | } |
| 663 | |
| 664 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, |
| 665 | int mode, dev_t rdev) |
| 666 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 667 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| 668 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 669 | struct ceph_mds_request *req; |
| 670 | int err; |
| 671 | |
| 672 | if (ceph_snap(dir) != CEPH_NOSNAP) |
| 673 | return -EROFS; |
| 674 | |
| 675 | dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", |
| 676 | dir, dentry, mode, rdev); |
| 677 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); |
| 678 | if (IS_ERR(req)) { |
| 679 | d_drop(dentry); |
| 680 | return PTR_ERR(req); |
| 681 | } |
| 682 | req->r_dentry = dget(dentry); |
| 683 | req->r_num_caps = 2; |
| 684 | req->r_locked_dir = dir; |
| 685 | req->r_args.mknod.mode = cpu_to_le32(mode); |
| 686 | req->r_args.mknod.rdev = cpu_to_le32(rdev); |
| 687 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| 688 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 689 | err = ceph_mdsc_do_request(mdsc, dir, req); |
| 690 | if (!err && !req->r_reply_info.head->is_dentry) |
| 691 | err = ceph_handle_notrace_create(dir, dentry); |
| 692 | ceph_mdsc_put_request(req); |
| 693 | if (err) |
| 694 | d_drop(dentry); |
| 695 | return err; |
| 696 | } |
| 697 | |
| 698 | static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, |
| 699 | struct nameidata *nd) |
| 700 | { |
| 701 | dout("create in dir %p dentry %p name '%.*s'\n", |
| 702 | dir, dentry, dentry->d_name.len, dentry->d_name.name); |
| 703 | |
| 704 | if (ceph_snap(dir) != CEPH_NOSNAP) |
| 705 | return -EROFS; |
| 706 | |
| 707 | if (nd) { |
| 708 | BUG_ON((nd->flags & LOOKUP_OPEN) == 0); |
| 709 | dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); |
| 710 | /* hrm, what should i do here if we get aliased? */ |
| 711 | if (IS_ERR(dentry)) |
| 712 | return PTR_ERR(dentry); |
| 713 | return 0; |
| 714 | } |
| 715 | |
| 716 | /* fall back to mknod */ |
| 717 | return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); |
| 718 | } |
| 719 | |
| 720 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, |
| 721 | const char *dest) |
| 722 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 723 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| 724 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 725 | struct ceph_mds_request *req; |
| 726 | int err; |
| 727 | |
| 728 | if (ceph_snap(dir) != CEPH_NOSNAP) |
| 729 | return -EROFS; |
| 730 | |
| 731 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); |
| 732 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); |
| 733 | if (IS_ERR(req)) { |
| 734 | d_drop(dentry); |
| 735 | return PTR_ERR(req); |
| 736 | } |
| 737 | req->r_dentry = dget(dentry); |
| 738 | req->r_num_caps = 2; |
| 739 | req->r_path2 = kstrdup(dest, GFP_NOFS); |
| 740 | req->r_locked_dir = dir; |
| 741 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| 742 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 743 | err = ceph_mdsc_do_request(mdsc, dir, req); |
| 744 | if (!err && !req->r_reply_info.head->is_dentry) |
| 745 | err = ceph_handle_notrace_create(dir, dentry); |
| 746 | ceph_mdsc_put_request(req); |
| 747 | if (err) |
| 748 | d_drop(dentry); |
| 749 | return err; |
| 750 | } |
| 751 | |
| 752 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 753 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 754 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| 755 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 756 | struct ceph_mds_request *req; |
| 757 | int err = -EROFS; |
| 758 | int op; |
| 759 | |
| 760 | if (ceph_snap(dir) == CEPH_SNAPDIR) { |
| 761 | /* mkdir .snap/foo is a MKSNAP */ |
| 762 | op = CEPH_MDS_OP_MKSNAP; |
| 763 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, |
| 764 | dentry->d_name.len, dentry->d_name.name, dentry); |
| 765 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
| 766 | dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); |
| 767 | op = CEPH_MDS_OP_MKDIR; |
| 768 | } else { |
| 769 | goto out; |
| 770 | } |
| 771 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
| 772 | if (IS_ERR(req)) { |
| 773 | err = PTR_ERR(req); |
| 774 | goto out; |
| 775 | } |
| 776 | |
| 777 | req->r_dentry = dget(dentry); |
| 778 | req->r_num_caps = 2; |
| 779 | req->r_locked_dir = dir; |
| 780 | req->r_args.mkdir.mode = cpu_to_le32(mode); |
| 781 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| 782 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 783 | err = ceph_mdsc_do_request(mdsc, dir, req); |
| 784 | if (!err && !req->r_reply_info.head->is_dentry) |
| 785 | err = ceph_handle_notrace_create(dir, dentry); |
| 786 | ceph_mdsc_put_request(req); |
| 787 | out: |
| 788 | if (err < 0) |
| 789 | d_drop(dentry); |
| 790 | return err; |
| 791 | } |
| 792 | |
| 793 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, |
| 794 | struct dentry *dentry) |
| 795 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 796 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| 797 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 798 | struct ceph_mds_request *req; |
| 799 | int err; |
| 800 | |
| 801 | if (ceph_snap(dir) != CEPH_NOSNAP) |
| 802 | return -EROFS; |
| 803 | |
| 804 | dout("link in dir %p old_dentry %p dentry %p\n", dir, |
| 805 | old_dentry, dentry); |
| 806 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); |
| 807 | if (IS_ERR(req)) { |
| 808 | d_drop(dentry); |
| 809 | return PTR_ERR(req); |
| 810 | } |
| 811 | req->r_dentry = dget(dentry); |
| 812 | req->r_num_caps = 2; |
| 813 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ |
| 814 | req->r_locked_dir = dir; |
| 815 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| 816 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 817 | err = ceph_mdsc_do_request(mdsc, dir, req); |
Sage Weil | 70b666c | 2011-05-27 09:24:26 -0700 | [diff] [blame] | 818 | if (err) { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 819 | d_drop(dentry); |
Sage Weil | 70b666c | 2011-05-27 09:24:26 -0700 | [diff] [blame] | 820 | } else if (!req->r_reply_info.head->is_dentry) { |
| 821 | ihold(old_dentry->d_inode); |
| 822 | d_instantiate(dentry, old_dentry->d_inode); |
| 823 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 824 | ceph_mdsc_put_request(req); |
| 825 | return err; |
| 826 | } |
| 827 | |
| 828 | /* |
| 829 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it |
| 830 | * looks like the link count will hit 0, drop any other caps (other |
| 831 | * than PIN) we don't specifically want (due to the file still being |
| 832 | * open). |
| 833 | */ |
| 834 | static int drop_caps_for_unlink(struct inode *inode) |
| 835 | { |
| 836 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 837 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
| 838 | |
| 839 | spin_lock(&inode->i_lock); |
| 840 | if (inode->i_nlink == 1) { |
| 841 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); |
| 842 | ci->i_ceph_flags |= CEPH_I_NODELAY; |
| 843 | } |
| 844 | spin_unlock(&inode->i_lock); |
| 845 | return drop; |
| 846 | } |
| 847 | |
| 848 | /* |
| 849 | * rmdir and unlink are differ only by the metadata op code |
| 850 | */ |
| 851 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) |
| 852 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 853 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
| 854 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 855 | struct inode *inode = dentry->d_inode; |
| 856 | struct ceph_mds_request *req; |
| 857 | int err = -EROFS; |
| 858 | int op; |
| 859 | |
| 860 | if (ceph_snap(dir) == CEPH_SNAPDIR) { |
| 861 | /* rmdir .snap/foo is RMSNAP */ |
| 862 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, |
| 863 | dentry->d_name.name, dentry); |
| 864 | op = CEPH_MDS_OP_RMSNAP; |
| 865 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
| 866 | dout("unlink/rmdir dir %p dn %p inode %p\n", |
| 867 | dir, dentry, inode); |
| 868 | op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? |
| 869 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
| 870 | } else |
| 871 | goto out; |
| 872 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
| 873 | if (IS_ERR(req)) { |
| 874 | err = PTR_ERR(req); |
| 875 | goto out; |
| 876 | } |
| 877 | req->r_dentry = dget(dentry); |
| 878 | req->r_num_caps = 2; |
| 879 | req->r_locked_dir = dir; |
| 880 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| 881 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 882 | req->r_inode_drop = drop_caps_for_unlink(inode); |
| 883 | err = ceph_mdsc_do_request(mdsc, dir, req); |
| 884 | if (!err && !req->r_reply_info.head->is_dentry) |
| 885 | d_delete(dentry); |
| 886 | ceph_mdsc_put_request(req); |
| 887 | out: |
| 888 | return err; |
| 889 | } |
| 890 | |
| 891 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 892 | struct inode *new_dir, struct dentry *new_dentry) |
| 893 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 894 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
| 895 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 896 | struct ceph_mds_request *req; |
| 897 | int err; |
| 898 | |
| 899 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) |
| 900 | return -EXDEV; |
| 901 | if (ceph_snap(old_dir) != CEPH_NOSNAP || |
| 902 | ceph_snap(new_dir) != CEPH_NOSNAP) |
| 903 | return -EROFS; |
| 904 | dout("rename dir %p dentry %p to dir %p dentry %p\n", |
| 905 | old_dir, old_dentry, new_dir, new_dentry); |
| 906 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); |
| 907 | if (IS_ERR(req)) |
| 908 | return PTR_ERR(req); |
| 909 | req->r_dentry = dget(new_dentry); |
| 910 | req->r_num_caps = 2; |
| 911 | req->r_old_dentry = dget(old_dentry); |
| 912 | req->r_locked_dir = new_dir; |
| 913 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; |
| 914 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 915 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
| 916 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
| 917 | /* release LINK_RDCACHE on source inode (mds will lock it) */ |
| 918 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; |
| 919 | if (new_dentry->d_inode) |
| 920 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); |
| 921 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
| 922 | if (!err && !req->r_reply_info.head->is_dentry) { |
| 923 | /* |
| 924 | * Normally d_move() is done by fill_trace (called by |
| 925 | * do_request, above). If there is no trace, we need |
| 926 | * to do it here. |
| 927 | */ |
Sage Weil | ea1409f | 2010-04-28 16:12:06 -0700 | [diff] [blame] | 928 | |
| 929 | /* d_move screws up d_subdirs order */ |
| 930 | ceph_i_clear(new_dir, CEPH_I_COMPLETE); |
| 931 | |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 932 | d_move(old_dentry, new_dentry); |
Sage Weil | ea1409f | 2010-04-28 16:12:06 -0700 | [diff] [blame] | 933 | |
| 934 | /* ensure target dentry is invalidated, despite |
| 935 | rehashing bug in vfs_rename_dir */ |
Sage Weil | 81a6cf2 | 2010-05-14 09:35:38 -0700 | [diff] [blame] | 936 | ceph_invalidate_dentry_lease(new_dentry); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 937 | } |
| 938 | ceph_mdsc_put_request(req); |
| 939 | return err; |
| 940 | } |
| 941 | |
Sage Weil | 81a6cf2 | 2010-05-14 09:35:38 -0700 | [diff] [blame] | 942 | /* |
| 943 | * Ensure a dentry lease will no longer revalidate. |
| 944 | */ |
| 945 | void ceph_invalidate_dentry_lease(struct dentry *dentry) |
| 946 | { |
| 947 | spin_lock(&dentry->d_lock); |
| 948 | dentry->d_time = jiffies; |
| 949 | ceph_dentry(dentry)->lease_shared_gen = 0; |
| 950 | spin_unlock(&dentry->d_lock); |
| 951 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 952 | |
| 953 | /* |
| 954 | * Check if dentry lease is valid. If not, delete the lease. Try to |
| 955 | * renew if the least is more than half up. |
| 956 | */ |
| 957 | static int dentry_lease_is_valid(struct dentry *dentry) |
| 958 | { |
| 959 | struct ceph_dentry_info *di; |
| 960 | struct ceph_mds_session *s; |
| 961 | int valid = 0; |
| 962 | u32 gen; |
| 963 | unsigned long ttl; |
| 964 | struct ceph_mds_session *session = NULL; |
| 965 | struct inode *dir = NULL; |
| 966 | u32 seq = 0; |
| 967 | |
| 968 | spin_lock(&dentry->d_lock); |
| 969 | di = ceph_dentry(dentry); |
| 970 | if (di && di->lease_session) { |
| 971 | s = di->lease_session; |
| 972 | spin_lock(&s->s_cap_lock); |
| 973 | gen = s->s_cap_gen; |
| 974 | ttl = s->s_cap_ttl; |
| 975 | spin_unlock(&s->s_cap_lock); |
| 976 | |
| 977 | if (di->lease_gen == gen && |
| 978 | time_before(jiffies, dentry->d_time) && |
| 979 | time_before(jiffies, ttl)) { |
| 980 | valid = 1; |
| 981 | if (di->lease_renew_after && |
| 982 | time_after(jiffies, di->lease_renew_after)) { |
| 983 | /* we should renew */ |
| 984 | dir = dentry->d_parent->d_inode; |
| 985 | session = ceph_get_mds_session(s); |
| 986 | seq = di->lease_seq; |
| 987 | di->lease_renew_after = 0; |
| 988 | di->lease_renew_from = jiffies; |
| 989 | } |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 990 | } |
| 991 | } |
| 992 | spin_unlock(&dentry->d_lock); |
| 993 | |
| 994 | if (session) { |
| 995 | ceph_mdsc_lease_send_msg(session, dir, dentry, |
| 996 | CEPH_MDS_LEASE_RENEW, seq); |
| 997 | ceph_put_mds_session(session); |
| 998 | } |
| 999 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); |
| 1000 | return valid; |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Check if directory-wide content lease/cap is valid. |
| 1005 | */ |
| 1006 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) |
| 1007 | { |
| 1008 | struct ceph_inode_info *ci = ceph_inode(dir); |
| 1009 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
| 1010 | int valid = 0; |
| 1011 | |
| 1012 | spin_lock(&dir->i_lock); |
| 1013 | if (ci->i_shared_gen == di->lease_shared_gen) |
| 1014 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); |
| 1015 | spin_unlock(&dir->i_lock); |
| 1016 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
| 1017 | dir, (unsigned)ci->i_shared_gen, dentry, |
| 1018 | (unsigned)di->lease_shared_gen, valid); |
| 1019 | return valid; |
| 1020 | } |
| 1021 | |
| 1022 | /* |
| 1023 | * Check if cached dentry can be trusted. |
| 1024 | */ |
| 1025 | static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1026 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1027 | struct inode *dir; |
| 1028 | |
Al Viro | 0eb980e | 2011-03-10 03:44:05 -0500 | [diff] [blame] | 1029 | if (nd && nd->flags & LOOKUP_RCU) |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1030 | return -ECHILD; |
| 1031 | |
| 1032 | dir = dentry->d_parent->d_inode; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1033 | |
Sage Weil | 1cd3935 | 2010-05-03 22:08:02 -0700 | [diff] [blame] | 1034 | dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, |
| 1035 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode, |
| 1036 | ceph_dentry(dentry)->offset); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1037 | |
| 1038 | /* always trust cached snapped dentries, snapdir dentry */ |
| 1039 | if (ceph_snap(dir) != CEPH_NOSNAP) { |
| 1040 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, |
| 1041 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); |
| 1042 | goto out_touch; |
| 1043 | } |
| 1044 | if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) |
| 1045 | goto out_touch; |
| 1046 | |
| 1047 | if (dentry_lease_is_valid(dentry) || |
| 1048 | dir_lease_is_valid(dir, dentry)) |
| 1049 | goto out_touch; |
| 1050 | |
| 1051 | dout("d_revalidate %p invalid\n", dentry); |
| 1052 | d_drop(dentry); |
| 1053 | return 0; |
| 1054 | out_touch: |
| 1055 | ceph_dentry_lru_touch(dentry); |
| 1056 | return 1; |
| 1057 | } |
| 1058 | |
| 1059 | /* |
Sage Weil | 147851d | 2011-03-15 14:57:41 -0700 | [diff] [blame] | 1060 | * Release our ceph_dentry_info. |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1061 | */ |
Sage Weil | 147851d | 2011-03-15 14:57:41 -0700 | [diff] [blame] | 1062 | static void ceph_d_release(struct dentry *dentry) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1063 | { |
| 1064 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1065 | |
Sage Weil | 147851d | 2011-03-15 14:57:41 -0700 | [diff] [blame] | 1066 | dout("d_release %p\n", dentry); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1067 | if (di) { |
| 1068 | ceph_dentry_lru_del(dentry); |
| 1069 | if (di->lease_session) |
| 1070 | ceph_put_mds_session(di->lease_session); |
| 1071 | kmem_cache_free(ceph_dentry_cachep, di); |
| 1072 | dentry->d_fsdata = NULL; |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, |
| 1077 | struct nameidata *nd) |
| 1078 | { |
| 1079 | /* |
| 1080 | * Eventually, we'll want to revalidate snapped metadata |
| 1081 | * too... probably... |
| 1082 | */ |
| 1083 | return 1; |
| 1084 | } |
| 1085 | |
| 1086 | |
| 1087 | |
| 1088 | /* |
| 1089 | * read() on a dir. This weird interface hack only works if mounted |
| 1090 | * with '-o dirstat'. |
| 1091 | */ |
| 1092 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, |
| 1093 | loff_t *ppos) |
| 1094 | { |
| 1095 | struct ceph_file_info *cf = file->private_data; |
| 1096 | struct inode *inode = file->f_dentry->d_inode; |
| 1097 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1098 | int left; |
Sage Weil | ae59808 | 2011-05-12 14:28:05 -0700 | [diff] [blame] | 1099 | const int bufsize = 1024; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1100 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1101 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1102 | return -EISDIR; |
| 1103 | |
| 1104 | if (!cf->dir_info) { |
Sage Weil | ae59808 | 2011-05-12 14:28:05 -0700 | [diff] [blame] | 1105 | cf->dir_info = kmalloc(bufsize, GFP_NOFS); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1106 | if (!cf->dir_info) |
| 1107 | return -ENOMEM; |
| 1108 | cf->dir_info_len = |
Sage Weil | ae59808 | 2011-05-12 14:28:05 -0700 | [diff] [blame] | 1109 | snprintf(cf->dir_info, bufsize, |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1110 | "entries: %20lld\n" |
| 1111 | " files: %20lld\n" |
| 1112 | " subdirs: %20lld\n" |
| 1113 | "rentries: %20lld\n" |
| 1114 | " rfiles: %20lld\n" |
| 1115 | " rsubdirs: %20lld\n" |
| 1116 | "rbytes: %20lld\n" |
| 1117 | "rctime: %10ld.%09ld\n", |
| 1118 | ci->i_files + ci->i_subdirs, |
| 1119 | ci->i_files, |
| 1120 | ci->i_subdirs, |
| 1121 | ci->i_rfiles + ci->i_rsubdirs, |
| 1122 | ci->i_rfiles, |
| 1123 | ci->i_rsubdirs, |
| 1124 | ci->i_rbytes, |
| 1125 | (long)ci->i_rctime.tv_sec, |
| 1126 | (long)ci->i_rctime.tv_nsec); |
| 1127 | } |
| 1128 | |
| 1129 | if (*ppos >= cf->dir_info_len) |
| 1130 | return 0; |
| 1131 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); |
| 1132 | left = copy_to_user(buf, cf->dir_info + *ppos, size); |
| 1133 | if (left == size) |
| 1134 | return -EFAULT; |
| 1135 | *ppos += (size - left); |
| 1136 | return size - left; |
| 1137 | } |
| 1138 | |
| 1139 | /* |
| 1140 | * an fsync() on a dir will wait for any uncommitted directory |
| 1141 | * operations to commit. |
| 1142 | */ |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 1143 | static int ceph_dir_fsync(struct file *file, int datasync) |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1144 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 1145 | struct inode *inode = file->f_path.dentry->d_inode; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1146 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1147 | struct list_head *head = &ci->i_unsafe_dirops; |
| 1148 | struct ceph_mds_request *req; |
| 1149 | u64 last_tid; |
| 1150 | int ret = 0; |
| 1151 | |
| 1152 | dout("dir_fsync %p\n", inode); |
| 1153 | spin_lock(&ci->i_unsafe_lock); |
| 1154 | if (list_empty(head)) |
| 1155 | goto out; |
| 1156 | |
| 1157 | req = list_entry(head->prev, |
| 1158 | struct ceph_mds_request, r_unsafe_dir_item); |
| 1159 | last_tid = req->r_tid; |
| 1160 | |
| 1161 | do { |
| 1162 | ceph_mdsc_get_request(req); |
| 1163 | spin_unlock(&ci->i_unsafe_lock); |
| 1164 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", |
| 1165 | inode, req->r_tid, last_tid); |
| 1166 | if (req->r_timeout) { |
| 1167 | ret = wait_for_completion_timeout( |
| 1168 | &req->r_safe_completion, req->r_timeout); |
| 1169 | if (ret > 0) |
| 1170 | ret = 0; |
| 1171 | else if (ret == 0) |
| 1172 | ret = -EIO; /* timed out */ |
| 1173 | } else { |
| 1174 | wait_for_completion(&req->r_safe_completion); |
| 1175 | } |
| 1176 | spin_lock(&ci->i_unsafe_lock); |
| 1177 | ceph_mdsc_put_request(req); |
| 1178 | |
| 1179 | if (ret || list_empty(head)) |
| 1180 | break; |
| 1181 | req = list_entry(head->next, |
| 1182 | struct ceph_mds_request, r_unsafe_dir_item); |
| 1183 | } while (req->r_tid < last_tid); |
| 1184 | out: |
| 1185 | spin_unlock(&ci->i_unsafe_lock); |
| 1186 | return ret; |
| 1187 | } |
| 1188 | |
| 1189 | /* |
| 1190 | * We maintain a private dentry LRU. |
| 1191 | * |
| 1192 | * FIXME: this needs to be changed to a per-mds lru to be useful. |
| 1193 | */ |
| 1194 | void ceph_dentry_lru_add(struct dentry *dn) |
| 1195 | { |
| 1196 | struct ceph_dentry_info *di = ceph_dentry(dn); |
| 1197 | struct ceph_mds_client *mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1198 | |
Sage Weil | 04a419f | 2009-12-23 09:30:21 -0800 | [diff] [blame] | 1199 | dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
| 1200 | dn->d_name.len, dn->d_name.name); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1201 | if (di) { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1202 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1203 | spin_lock(&mdsc->dentry_lru_lock); |
| 1204 | list_add_tail(&di->lru, &mdsc->dentry_lru); |
| 1205 | mdsc->num_dentry++; |
| 1206 | spin_unlock(&mdsc->dentry_lru_lock); |
| 1207 | } |
| 1208 | } |
| 1209 | |
| 1210 | void ceph_dentry_lru_touch(struct dentry *dn) |
| 1211 | { |
| 1212 | struct ceph_dentry_info *di = ceph_dentry(dn); |
| 1213 | struct ceph_mds_client *mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1214 | |
Sage Weil | 1cd3935 | 2010-05-03 22:08:02 -0700 | [diff] [blame] | 1215 | dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, |
| 1216 | dn->d_name.len, dn->d_name.name, di->offset); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1217 | if (di) { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1218 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1219 | spin_lock(&mdsc->dentry_lru_lock); |
| 1220 | list_move_tail(&di->lru, &mdsc->dentry_lru); |
| 1221 | spin_unlock(&mdsc->dentry_lru_lock); |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | void ceph_dentry_lru_del(struct dentry *dn) |
| 1226 | { |
| 1227 | struct ceph_dentry_info *di = ceph_dentry(dn); |
| 1228 | struct ceph_mds_client *mdsc; |
| 1229 | |
Sage Weil | 04a419f | 2009-12-23 09:30:21 -0800 | [diff] [blame] | 1230 | dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
| 1231 | dn->d_name.len, dn->d_name.name); |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1232 | if (di) { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1233 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1234 | spin_lock(&mdsc->dentry_lru_lock); |
| 1235 | list_del_init(&di->lru); |
| 1236 | mdsc->num_dentry--; |
| 1237 | spin_unlock(&mdsc->dentry_lru_lock); |
| 1238 | } |
| 1239 | } |
| 1240 | |
Sage Weil | 6c0f3af | 2010-11-16 11:14:34 -0800 | [diff] [blame] | 1241 | /* |
| 1242 | * Return name hash for a given dentry. This is dependent on |
| 1243 | * the parent directory's hash function. |
| 1244 | */ |
| 1245 | unsigned ceph_dentry_hash(struct dentry *dn) |
| 1246 | { |
| 1247 | struct inode *dir = dn->d_parent->d_inode; |
| 1248 | struct ceph_inode_info *dci = ceph_inode(dir); |
| 1249 | |
| 1250 | switch (dci->i_dir_layout.dl_dir_hash) { |
| 1251 | case 0: /* for backward compat */ |
| 1252 | case CEPH_STR_HASH_LINUX: |
| 1253 | return dn->d_name.hash; |
| 1254 | |
| 1255 | default: |
| 1256 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, |
| 1257 | dn->d_name.name, dn->d_name.len); |
| 1258 | } |
| 1259 | } |
| 1260 | |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1261 | const struct file_operations ceph_dir_fops = { |
| 1262 | .read = ceph_read_dir, |
| 1263 | .readdir = ceph_readdir, |
| 1264 | .llseek = ceph_dir_llseek, |
| 1265 | .open = ceph_open, |
| 1266 | .release = ceph_release, |
| 1267 | .unlocked_ioctl = ceph_ioctl, |
| 1268 | .fsync = ceph_dir_fsync, |
| 1269 | }; |
| 1270 | |
| 1271 | const struct inode_operations ceph_dir_iops = { |
| 1272 | .lookup = ceph_lookup, |
| 1273 | .permission = ceph_permission, |
| 1274 | .getattr = ceph_getattr, |
| 1275 | .setattr = ceph_setattr, |
| 1276 | .setxattr = ceph_setxattr, |
| 1277 | .getxattr = ceph_getxattr, |
| 1278 | .listxattr = ceph_listxattr, |
| 1279 | .removexattr = ceph_removexattr, |
| 1280 | .mknod = ceph_mknod, |
| 1281 | .symlink = ceph_symlink, |
| 1282 | .mkdir = ceph_mkdir, |
| 1283 | .link = ceph_link, |
| 1284 | .unlink = ceph_unlink, |
| 1285 | .rmdir = ceph_unlink, |
| 1286 | .rename = ceph_rename, |
| 1287 | .create = ceph_create, |
| 1288 | }; |
| 1289 | |
Sage Weil | 52dfb8a | 2010-08-03 10:25:30 -0700 | [diff] [blame] | 1290 | const struct dentry_operations ceph_dentry_ops = { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1291 | .d_revalidate = ceph_d_revalidate, |
Sage Weil | 147851d | 2011-03-15 14:57:41 -0700 | [diff] [blame] | 1292 | .d_release = ceph_d_release, |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1293 | }; |
| 1294 | |
Sage Weil | 52dfb8a | 2010-08-03 10:25:30 -0700 | [diff] [blame] | 1295 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1296 | .d_revalidate = ceph_snapdir_d_revalidate, |
Sage Weil | 147851d | 2011-03-15 14:57:41 -0700 | [diff] [blame] | 1297 | .d_release = ceph_d_release, |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1298 | }; |
| 1299 | |
Sage Weil | 52dfb8a | 2010-08-03 10:25:30 -0700 | [diff] [blame] | 1300 | const struct dentry_operations ceph_snap_dentry_ops = { |
Sage Weil | 147851d | 2011-03-15 14:57:41 -0700 | [diff] [blame] | 1301 | .d_release = ceph_d_release, |
Sage Weil | 2817b00 | 2009-10-06 11:31:08 -0700 | [diff] [blame] | 1302 | }; |