source: src/linux/universal/linux-4.9/fs/orangefs/super.c @ 31859

Last change on this file since 31859 was 31859, checked in by brainslayer, 11 days ago

kernel update

File size: 15.5 KB
Line 
1/*
2 * (C) 2001 Clemson University and The University of Chicago
3 *
4 * See COPYING in top-level directory.
5 */
6
7#include "protocol.h"
8#include "orangefs-kernel.h"
9#include "orangefs-bufmap.h"
10
11#include <linux/parser.h>
12
13/* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
14static struct kmem_cache *orangefs_inode_cache;
15
16/* list for storing orangefs specific superblocks in use */
17LIST_HEAD(orangefs_superblocks);
18
19DEFINE_SPINLOCK(orangefs_superblocks_lock);
20
21enum {
22        Opt_intr,
23        Opt_acl,
24        Opt_local_lock,
25
26        Opt_err
27};
28
29static const match_table_t tokens = {
30        { Opt_acl,              "acl" },
31        { Opt_intr,             "intr" },
32        { Opt_local_lock,       "local_lock" },
33        { Opt_err,      NULL }
34};
35
36uint64_t orangefs_features;
37
38static int parse_mount_options(struct super_block *sb, char *options,
39                int silent)
40{
41        struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
42        substring_t args[MAX_OPT_ARGS];
43        char *p;
44
45        /*
46         * Force any potential flags that might be set from the mount
47         * to zero, ie, initialize to unset.
48         */
49        sb->s_flags &= ~MS_POSIXACL;
50        orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
51        orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
52
53        while ((p = strsep(&options, ",")) != NULL) {
54                int token;
55
56                if (!*p)
57                        continue;
58
59                token = match_token(p, tokens, args);
60                switch (token) {
61                case Opt_acl:
62                        sb->s_flags |= MS_POSIXACL;
63                        break;
64                case Opt_intr:
65                        orangefs_sb->flags |= ORANGEFS_OPT_INTR;
66                        break;
67                case Opt_local_lock:
68                        orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
69                        break;
70                default:
71                        goto fail;
72                }
73        }
74
75        return 0;
76fail:
77        if (!silent)
78                gossip_err("Error: mount option [%s] is not supported.\n", p);
79        return -EINVAL;
80}
81
82static void orangefs_inode_cache_ctor(void *req)
83{
84        struct orangefs_inode_s *orangefs_inode = req;
85
86        inode_init_once(&orangefs_inode->vfs_inode);
87        init_rwsem(&orangefs_inode->xattr_sem);
88
89        orangefs_inode->vfs_inode.i_version = 1;
90}
91
92static struct inode *orangefs_alloc_inode(struct super_block *sb)
93{
94        struct orangefs_inode_s *orangefs_inode;
95
96        orangefs_inode = kmem_cache_alloc(orangefs_inode_cache, GFP_KERNEL);
97        if (orangefs_inode == NULL) {
98                gossip_err("Failed to allocate orangefs_inode\n");
99                return NULL;
100        }
101
102        /*
103         * We want to clear everything except for rw_semaphore and the
104         * vfs_inode.
105         */
106        memset(&orangefs_inode->refn.khandle, 0, 16);
107        orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
108        orangefs_inode->last_failed_block_index_read = 0;
109        memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
110        orangefs_inode->pinode_flags = 0;
111
112        gossip_debug(GOSSIP_SUPER_DEBUG,
113                     "orangefs_alloc_inode: allocated %p\n",
114                     &orangefs_inode->vfs_inode);
115        return &orangefs_inode->vfs_inode;
116}
117
118static void orangefs_i_callback(struct rcu_head *head)
119{
120        struct inode *inode = container_of(head, struct inode, i_rcu);
121        struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
122        kmem_cache_free(orangefs_inode_cache, orangefs_inode);
123}
124
125static void orangefs_destroy_inode(struct inode *inode)
126{
127        struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
128
129        gossip_debug(GOSSIP_SUPER_DEBUG,
130                        "%s: deallocated %p destroying inode %pU\n",
131                        __func__, orangefs_inode, get_khandle_from_ino(inode));
132
133        call_rcu(&inode->i_rcu, orangefs_i_callback);
134}
135
136/*
137 * NOTE: information filled in here is typically reflected in the
138 * output of the system command 'df'
139*/
140static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
141{
142        int ret = -ENOMEM;
143        struct orangefs_kernel_op_s *new_op = NULL;
144        int flags = 0;
145        struct super_block *sb = NULL;
146
147        sb = dentry->d_sb;
148
149        gossip_debug(GOSSIP_SUPER_DEBUG,
150                     "orangefs_statfs: called on sb %p (fs_id is %d)\n",
151                     sb,
152                     (int)(ORANGEFS_SB(sb)->fs_id));
153
154        new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
155        if (!new_op)
156                return ret;
157        new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
158
159        if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
160                flags = ORANGEFS_OP_INTERRUPTIBLE;
161
162        ret = service_operation(new_op, "orangefs_statfs", flags);
163
164        if (new_op->downcall.status < 0)
165                goto out_op_release;
166
167        gossip_debug(GOSSIP_SUPER_DEBUG,
168                     "%s: got %ld blocks available | "
169                     "%ld blocks total | %ld block size | "
170                     "%ld files total | %ld files avail\n",
171                     __func__,
172                     (long)new_op->downcall.resp.statfs.blocks_avail,
173                     (long)new_op->downcall.resp.statfs.blocks_total,
174                     (long)new_op->downcall.resp.statfs.block_size,
175                     (long)new_op->downcall.resp.statfs.files_total,
176                     (long)new_op->downcall.resp.statfs.files_avail);
177
178        buf->f_type = sb->s_magic;
179        memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
180        buf->f_bsize = new_op->downcall.resp.statfs.block_size;
181        buf->f_namelen = ORANGEFS_NAME_MAX;
182
183        buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
184        buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
185        buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
186        buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
187        buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
188        buf->f_frsize = sb->s_blocksize;
189
190out_op_release:
191        op_release(new_op);
192        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_statfs: returning %d\n", ret);
193        return ret;
194}
195
196/*
197 * Remount as initiated by VFS layer.  We just need to reparse the mount
198 * options, no need to signal pvfs2-client-core about it.
199 */
200static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
201{
202        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
203        return parse_mount_options(sb, data, 1);
204}
205
206/*
207 * Remount as initiated by pvfs2-client-core on restart.  This is used to
208 * repopulate mount information left from previous pvfs2-client-core.
209 *
210 * the idea here is that given a valid superblock, we're
211 * re-initializing the user space client with the initial mount
212 * information specified when the super block was first initialized.
213 * this is very different than the first initialization/creation of a
214 * superblock.  we use the special service_priority_operation to make
215 * sure that the mount gets ahead of any other pending operation that
216 * is waiting for servicing.  this means that the pvfs2-client won't
217 * fail to start several times for all other pending operations before
218 * the client regains all of the mount information from us.
219 * NOTE: this function assumes that the request_mutex is already acquired!
220 */
221int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
222{
223        struct orangefs_kernel_op_s *new_op;
224        int ret = -EINVAL;
225
226        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
227
228        new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
229        if (!new_op)
230                return -ENOMEM;
231        strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
232                orangefs_sb->devname,
233                ORANGEFS_MAX_SERVER_ADDR_LEN);
234
235        gossip_debug(GOSSIP_SUPER_DEBUG,
236                     "Attempting ORANGEFS Remount via host %s\n",
237                     new_op->upcall.req.fs_mount.orangefs_config_server);
238
239        /*
240         * we assume that the calling function has already acquired the
241         * request_mutex to prevent other operations from bypassing
242         * this one
243         */
244        ret = service_operation(new_op, "orangefs_remount",
245                ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
246        gossip_debug(GOSSIP_SUPER_DEBUG,
247                     "orangefs_remount: mount got return value of %d\n",
248                     ret);
249        if (ret == 0) {
250                /*
251                 * store the id assigned to this sb -- it's just a
252                 * short-lived mapping that the system interface uses
253                 * to map this superblock to a particular mount entry
254                 */
255                orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
256                orangefs_sb->mount_pending = 0;
257        }
258
259        op_release(new_op);
260
261        if (orangefs_userspace_version >= 20906) {
262                new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
263                if (!new_op)
264                        return -ENOMEM;
265                new_op->upcall.req.features.features = 0;
266                ret = service_operation(new_op, "orangefs_features",
267                    ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
268                if (!ret)
269                        orangefs_features =
270                            new_op->downcall.resp.features.features;
271                else
272                        orangefs_features = 0;
273                op_release(new_op);
274        } else {
275                orangefs_features = 0;
276        }
277
278        return ret;
279}
280
281int fsid_key_table_initialize(void)
282{
283        return 0;
284}
285
286void fsid_key_table_finalize(void)
287{
288}
289
290/* Called whenever the VFS dirties the inode in response to atime updates */
291static void orangefs_dirty_inode(struct inode *inode, int flags)
292{
293        struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
294
295        gossip_debug(GOSSIP_SUPER_DEBUG,
296                     "orangefs_dirty_inode: %pU\n",
297                     get_khandle_from_ino(inode));
298        SetAtimeFlag(orangefs_inode);
299}
300
301static const struct super_operations orangefs_s_ops = {
302        .alloc_inode = orangefs_alloc_inode,
303        .destroy_inode = orangefs_destroy_inode,
304        .dirty_inode = orangefs_dirty_inode,
305        .drop_inode = generic_delete_inode,
306        .statfs = orangefs_statfs,
307        .remount_fs = orangefs_remount_fs,
308        .show_options = generic_show_options,
309};
310
311static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
312                                  struct fid *fid,
313                                  int fh_len,
314                                  int fh_type)
315{
316        struct orangefs_object_kref refn;
317
318        if (fh_len < 5 || fh_type > 2)
319                return NULL;
320
321        ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
322        refn.fs_id = (u32) fid->raw[4];
323        gossip_debug(GOSSIP_SUPER_DEBUG,
324                     "fh_to_dentry: handle %pU, fs_id %d\n",
325                     &refn.khandle,
326                     refn.fs_id);
327
328        return d_obtain_alias(orangefs_iget(sb, &refn));
329}
330
331static int orangefs_encode_fh(struct inode *inode,
332                    __u32 *fh,
333                    int *max_len,
334                    struct inode *parent)
335{
336        int len = parent ? 10 : 5;
337        int type = 1;
338        struct orangefs_object_kref refn;
339
340        if (*max_len < len) {
341                gossip_lerr("fh buffer is too small for encoding\n");
342                *max_len = len;
343                type = 255;
344                goto out;
345        }
346
347        refn = ORANGEFS_I(inode)->refn;
348        ORANGEFS_khandle_to(&refn.khandle, fh, 16);
349        fh[4] = refn.fs_id;
350
351        gossip_debug(GOSSIP_SUPER_DEBUG,
352                     "Encoding fh: handle %pU, fsid %u\n",
353                     &refn.khandle,
354                     refn.fs_id);
355
356
357        if (parent) {
358                refn = ORANGEFS_I(parent)->refn;
359                ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
360                fh[9] = refn.fs_id;
361
362                type = 2;
363                gossip_debug(GOSSIP_SUPER_DEBUG,
364                             "Encoding parent: handle %pU, fsid %u\n",
365                             &refn.khandle,
366                             refn.fs_id);
367        }
368        *max_len = len;
369
370out:
371        return type;
372}
373
374static const struct export_operations orangefs_export_ops = {
375        .encode_fh = orangefs_encode_fh,
376        .fh_to_dentry = orangefs_fh_to_dentry,
377};
378
379static int orangefs_fill_sb(struct super_block *sb,
380                struct orangefs_fs_mount_response *fs_mount,
381                void *data, int silent)
382{
383        int ret = -EINVAL;
384        struct inode *root = NULL;
385        struct dentry *root_dentry = NULL;
386        struct orangefs_object_kref root_object;
387
388        /* alloc and init our private orangefs sb info */
389        sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
390        if (!ORANGEFS_SB(sb))
391                return -ENOMEM;
392        ORANGEFS_SB(sb)->sb = sb;
393
394        ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
395        ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
396        ORANGEFS_SB(sb)->id = fs_mount->id;
397
398        if (data) {
399                ret = parse_mount_options(sb, data, silent);
400                if (ret)
401                        return ret;
402        }
403
404        /* Hang the xattr handlers off the superblock */
405        sb->s_xattr = orangefs_xattr_handlers;
406        sb->s_magic = ORANGEFS_SUPER_MAGIC;
407        sb->s_op = &orangefs_s_ops;
408        sb->s_d_op = &orangefs_dentry_operations;
409
410        sb->s_blocksize = orangefs_bufmap_size_query();
411        sb->s_blocksize_bits = orangefs_bufmap_shift_query();
412        sb->s_maxbytes = MAX_LFS_FILESIZE;
413
414        root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
415        root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
416        gossip_debug(GOSSIP_SUPER_DEBUG,
417                     "get inode %pU, fsid %d\n",
418                     &root_object.khandle,
419                     root_object.fs_id);
420
421        root = orangefs_iget(sb, &root_object);
422        if (IS_ERR(root))
423                return PTR_ERR(root);
424
425        gossip_debug(GOSSIP_SUPER_DEBUG,
426                     "Allocated root inode [%p] with mode %x\n",
427                     root,
428                     root->i_mode);
429
430        /* allocates and places root dentry in dcache */
431        root_dentry = d_make_root(root);
432        if (!root_dentry)
433                return -ENOMEM;
434
435        sb->s_export_op = &orangefs_export_ops;
436        sb->s_root = root_dentry;
437        return 0;
438}
439
440struct dentry *orangefs_mount(struct file_system_type *fst,
441                           int flags,
442                           const char *devname,
443                           void *data)
444{
445        int ret = -EINVAL;
446        struct super_block *sb = ERR_PTR(-EINVAL);
447        struct orangefs_kernel_op_s *new_op;
448        struct dentry *d = ERR_PTR(-EINVAL);
449
450        gossip_debug(GOSSIP_SUPER_DEBUG,
451                     "orangefs_mount: called with devname %s\n",
452                     devname);
453
454        if (!devname) {
455                gossip_err("ERROR: device name not specified.\n");
456                return ERR_PTR(-EINVAL);
457        }
458
459        new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
460        if (!new_op)
461                return ERR_PTR(-ENOMEM);
462
463        strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
464                devname,
465                ORANGEFS_MAX_SERVER_ADDR_LEN);
466
467        gossip_debug(GOSSIP_SUPER_DEBUG,
468                     "Attempting ORANGEFS Mount via host %s\n",
469                     new_op->upcall.req.fs_mount.orangefs_config_server);
470
471        ret = service_operation(new_op, "orangefs_mount", 0);
472        gossip_debug(GOSSIP_SUPER_DEBUG,
473                     "orangefs_mount: mount got return value of %d\n", ret);
474        if (ret)
475                goto free_op;
476
477        if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
478                gossip_err("ERROR: Retrieved null fs_id\n");
479                ret = -EINVAL;
480                goto free_op;
481        }
482
483        sb = sget(fst, NULL, set_anon_super, flags, NULL);
484
485        if (IS_ERR(sb)) {
486                d = ERR_CAST(sb);
487                goto free_op;
488        }
489
490        ret = orangefs_fill_sb(sb,
491              &new_op->downcall.resp.fs_mount, data,
492              flags & MS_SILENT ? 1 : 0);
493
494        if (ret) {
495                d = ERR_PTR(ret);
496                goto free_op;
497        }
498
499        /*
500         * on successful mount, store the devname and data
501         * used
502         */
503        strncpy(ORANGEFS_SB(sb)->devname,
504                devname,
505                ORANGEFS_MAX_SERVER_ADDR_LEN);
506
507        /* mount_pending must be cleared */
508        ORANGEFS_SB(sb)->mount_pending = 0;
509
510        /*
511         * finally, add this sb to our list of known orangefs
512         * sb's
513         */
514        gossip_debug(GOSSIP_SUPER_DEBUG,
515                     "Adding SB %p to orangefs superblocks\n",
516                     ORANGEFS_SB(sb));
517        spin_lock(&orangefs_superblocks_lock);
518        list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
519        spin_unlock(&orangefs_superblocks_lock);
520        op_release(new_op);
521
522        if (orangefs_userspace_version >= 20906) {
523                new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
524                if (!new_op)
525                        return ERR_PTR(-ENOMEM);
526                new_op->upcall.req.features.features = 0;
527                ret = service_operation(new_op, "orangefs_features", 0);
528                orangefs_features = new_op->downcall.resp.features.features;
529                op_release(new_op);
530        } else {
531                orangefs_features = 0;
532        }
533
534        return dget(sb->s_root);
535
536free_op:
537        gossip_err("orangefs_mount: mount request failed with %d\n", ret);
538        if (ret == -EINVAL) {
539                gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
540                gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
541        }
542
543        op_release(new_op);
544
545        return d;
546}
547
548void orangefs_kill_sb(struct super_block *sb)
549{
550        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
551
552        /* provided sb cleanup */
553        kill_anon_super(sb);
554
555        /*
556         * issue the unmount to userspace to tell it to remove the
557         * dynamic mount info it has for this superblock
558         */
559         orangefs_unmount_sb(sb);
560
561        /* remove the sb from our list of orangefs specific sb's */
562
563        spin_lock(&orangefs_superblocks_lock);
564        __list_del_entry(&ORANGEFS_SB(sb)->list);       /* not list_del_init */
565        ORANGEFS_SB(sb)->list.prev = NULL;
566        spin_unlock(&orangefs_superblocks_lock);
567
568        /*
569         * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
570         * gets completed before we free the dang thing.
571         */
572        mutex_lock(&orangefs_request_mutex);
573        mutex_unlock(&orangefs_request_mutex);
574
575        /* free the orangefs superblock private data */
576        kfree(ORANGEFS_SB(sb));
577}
578
579int orangefs_inode_cache_initialize(void)
580{
581        orangefs_inode_cache = kmem_cache_create("orangefs_inode_cache",
582                                              sizeof(struct orangefs_inode_s),
583                                              0,
584                                              ORANGEFS_CACHE_CREATE_FLAGS,
585                                              orangefs_inode_cache_ctor);
586
587        if (!orangefs_inode_cache) {
588                gossip_err("Cannot create orangefs_inode_cache\n");
589                return -ENOMEM;
590        }
591        return 0;
592}
593
594int orangefs_inode_cache_finalize(void)
595{
596        kmem_cache_destroy(orangefs_inode_cache);
597        return 0;
598}
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