2 * (C) 2001 Clemson University and The University of Chicago
4 * See COPYING in top-level directory.
8 #include "pvfs2-kernel.h"
9 #include "pvfs2-bufmap.h"
11 #include <linux/parser.h>
13 /* a cache for pvfs2-inode objects (i.e. pvfs2 inode private data) */
14 static struct kmem_cache
*pvfs2_inode_cache
;
16 /* list for storing pvfs2 specific superblocks in use */
17 LIST_HEAD(pvfs2_superblocks
);
19 DEFINE_SPINLOCK(pvfs2_superblocks_lock
);
29 static const match_table_t tokens
= {
32 { Opt_local_lock
, "local_lock" },
37 static int parse_mount_options(struct super_block
*sb
, char *options
,
40 struct pvfs2_sb_info_s
*pvfs2_sb
= PVFS2_SB(sb
);
41 substring_t args
[MAX_OPT_ARGS
];
45 * Force any potential flags that might be set from the mount
46 * to zero, ie, initialize to unset.
48 sb
->s_flags
&= ~MS_POSIXACL
;
49 pvfs2_sb
->flags
&= ~PVFS2_OPT_INTR
;
50 pvfs2_sb
->flags
&= ~PVFS2_OPT_LOCAL_LOCK
;
52 while ((p
= strsep(&options
, ",")) != NULL
) {
58 token
= match_token(p
, tokens
, args
);
61 sb
->s_flags
|= MS_POSIXACL
;
64 pvfs2_sb
->flags
|= PVFS2_OPT_INTR
;
67 pvfs2_sb
->flags
|= PVFS2_OPT_LOCAL_LOCK
;
77 gossip_err("Error: mount option [%s] is not supported.\n", p
);
81 static void pvfs2_inode_cache_ctor(void *req
)
83 struct pvfs2_inode_s
*pvfs2_inode
= req
;
85 inode_init_once(&pvfs2_inode
->vfs_inode
);
86 init_rwsem(&pvfs2_inode
->xattr_sem
);
88 pvfs2_inode
->vfs_inode
.i_version
= 1;
91 static struct inode
*pvfs2_alloc_inode(struct super_block
*sb
)
93 struct pvfs2_inode_s
*pvfs2_inode
;
95 pvfs2_inode
= kmem_cache_alloc(pvfs2_inode_cache
,
96 PVFS2_CACHE_ALLOC_FLAGS
);
97 if (pvfs2_inode
== NULL
) {
98 gossip_err("Failed to allocate pvfs2_inode\n");
103 * We want to clear everything except for rw_semaphore and the
106 memset(&pvfs2_inode
->refn
.khandle
, 0, 16);
107 pvfs2_inode
->refn
.fs_id
= PVFS_FS_ID_NULL
;
108 pvfs2_inode
->last_failed_block_index_read
= 0;
109 memset(pvfs2_inode
->link_target
, 0, sizeof(pvfs2_inode
->link_target
));
110 pvfs2_inode
->pinode_flags
= 0;
112 gossip_debug(GOSSIP_SUPER_DEBUG
,
113 "pvfs2_alloc_inode: allocated %p\n",
114 &pvfs2_inode
->vfs_inode
);
115 return &pvfs2_inode
->vfs_inode
;
118 static void pvfs2_destroy_inode(struct inode
*inode
)
120 struct pvfs2_inode_s
*pvfs2_inode
= PVFS2_I(inode
);
122 gossip_debug(GOSSIP_SUPER_DEBUG
,
123 "%s: deallocated %p destroying inode %pU\n",
124 __func__
, pvfs2_inode
, get_khandle_from_ino(inode
));
126 kmem_cache_free(pvfs2_inode_cache
, pvfs2_inode
);
130 * NOTE: information filled in here is typically reflected in the
131 * output of the system command 'df'
133 static int pvfs2_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
136 struct pvfs2_kernel_op_s
*new_op
= NULL
;
138 struct super_block
*sb
= NULL
;
142 gossip_debug(GOSSIP_SUPER_DEBUG
,
143 "pvfs2_statfs: called on sb %p (fs_id is %d)\n",
145 (int)(PVFS2_SB(sb
)->fs_id
));
147 new_op
= op_alloc(PVFS2_VFS_OP_STATFS
);
150 new_op
->upcall
.req
.statfs
.fs_id
= PVFS2_SB(sb
)->fs_id
;
152 if (PVFS2_SB(sb
)->flags
& PVFS2_OPT_INTR
)
153 flags
= PVFS2_OP_INTERRUPTIBLE
;
155 ret
= service_operation(new_op
, "pvfs2_statfs", flags
);
157 if (new_op
->downcall
.status
< 0)
160 gossip_debug(GOSSIP_SUPER_DEBUG
,
161 "pvfs2_statfs: got %ld blocks available | "
162 "%ld blocks total | %ld block size\n",
163 (long)new_op
->downcall
.resp
.statfs
.blocks_avail
,
164 (long)new_op
->downcall
.resp
.statfs
.blocks_total
,
165 (long)new_op
->downcall
.resp
.statfs
.block_size
);
167 buf
->f_type
= sb
->s_magic
;
168 memcpy(&buf
->f_fsid
, &PVFS2_SB(sb
)->fs_id
, sizeof(buf
->f_fsid
));
169 buf
->f_bsize
= new_op
->downcall
.resp
.statfs
.block_size
;
170 buf
->f_namelen
= PVFS2_NAME_LEN
;
172 buf
->f_blocks
= (sector_t
) new_op
->downcall
.resp
.statfs
.blocks_total
;
173 buf
->f_bfree
= (sector_t
) new_op
->downcall
.resp
.statfs
.blocks_avail
;
174 buf
->f_bavail
= (sector_t
) new_op
->downcall
.resp
.statfs
.blocks_avail
;
175 buf
->f_files
= (sector_t
) new_op
->downcall
.resp
.statfs
.files_total
;
176 buf
->f_ffree
= (sector_t
) new_op
->downcall
.resp
.statfs
.files_avail
;
177 buf
->f_frsize
= sb
->s_blocksize
;
181 gossip_debug(GOSSIP_SUPER_DEBUG
, "pvfs2_statfs: returning %d\n", ret
);
186 * Remount as initiated by VFS layer. We just need to reparse the mount
187 * options, no need to signal pvfs2-client-core about it.
189 static int pvfs2_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
191 gossip_debug(GOSSIP_SUPER_DEBUG
, "pvfs2_remount_fs: called\n");
192 return parse_mount_options(sb
, data
, 1);
196 * Remount as initiated by pvfs2-client-core on restart. This is used to
197 * repopulate mount information left from previous pvfs2-client-core.
199 * the idea here is that given a valid superblock, we're
200 * re-initializing the user space client with the initial mount
201 * information specified when the super block was first initialized.
202 * this is very different than the first initialization/creation of a
203 * superblock. we use the special service_priority_operation to make
204 * sure that the mount gets ahead of any other pending operation that
205 * is waiting for servicing. this means that the pvfs2-client won't
206 * fail to start several times for all other pending operations before
207 * the client regains all of the mount information from us.
208 * NOTE: this function assumes that the request_mutex is already acquired!
210 int pvfs2_remount(struct super_block
*sb
)
212 struct pvfs2_kernel_op_s
*new_op
;
215 gossip_debug(GOSSIP_SUPER_DEBUG
, "pvfs2_remount: called\n");
217 new_op
= op_alloc(PVFS2_VFS_OP_FS_MOUNT
);
220 strncpy(new_op
->upcall
.req
.fs_mount
.pvfs2_config_server
,
221 PVFS2_SB(sb
)->devname
,
222 PVFS_MAX_SERVER_ADDR_LEN
);
224 gossip_debug(GOSSIP_SUPER_DEBUG
,
225 "Attempting PVFS2 Remount via host %s\n",
226 new_op
->upcall
.req
.fs_mount
.pvfs2_config_server
);
229 * we assume that the calling function has already acquire the
230 * request_mutex to prevent other operations from bypassing
233 ret
= service_operation(new_op
, "pvfs2_remount",
234 PVFS2_OP_PRIORITY
| PVFS2_OP_NO_SEMAPHORE
);
235 gossip_debug(GOSSIP_SUPER_DEBUG
,
236 "pvfs2_remount: mount got return value of %d\n",
240 * store the id assigned to this sb -- it's just a
241 * short-lived mapping that the system interface uses
242 * to map this superblock to a particular mount entry
244 PVFS2_SB(sb
)->id
= new_op
->downcall
.resp
.fs_mount
.id
;
245 PVFS2_SB(sb
)->mount_pending
= 0;
252 int fsid_key_table_initialize(void)
257 void fsid_key_table_finalize(void)
261 /* Called whenever the VFS dirties the inode in response to atime updates */
262 static void pvfs2_dirty_inode(struct inode
*inode
, int flags
)
264 struct pvfs2_inode_s
*pvfs2_inode
= PVFS2_I(inode
);
266 gossip_debug(GOSSIP_SUPER_DEBUG
,
267 "pvfs2_dirty_inode: %pU\n",
268 get_khandle_from_ino(inode
));
269 SetAtimeFlag(pvfs2_inode
);
272 struct super_operations pvfs2_s_ops
= {
273 .alloc_inode
= pvfs2_alloc_inode
,
274 .destroy_inode
= pvfs2_destroy_inode
,
275 .dirty_inode
= pvfs2_dirty_inode
,
276 .drop_inode
= generic_delete_inode
,
277 .statfs
= pvfs2_statfs
,
278 .remount_fs
= pvfs2_remount_fs
,
279 .show_options
= generic_show_options
,
282 struct dentry
*pvfs2_fh_to_dentry(struct super_block
*sb
,
287 struct pvfs2_object_kref refn
;
289 if (fh_len
< 5 || fh_type
> 2)
292 PVFS_khandle_from(&(refn
.khandle
), fid
->raw
, 16);
293 refn
.fs_id
= (u32
) fid
->raw
[4];
294 gossip_debug(GOSSIP_SUPER_DEBUG
,
295 "fh_to_dentry: handle %pU, fs_id %d\n",
299 return d_obtain_alias(pvfs2_iget(sb
, &refn
));
302 int pvfs2_encode_fh(struct inode
*inode
,
305 struct inode
*parent
)
307 int len
= parent
? 10 : 5;
309 struct pvfs2_object_kref refn
;
311 if (*max_len
< len
) {
312 gossip_lerr("fh buffer is too small for encoding\n");
318 refn
= PVFS2_I(inode
)->refn
;
319 PVFS_khandle_to(&refn
.khandle
, fh
, 16);
322 gossip_debug(GOSSIP_SUPER_DEBUG
,
323 "Encoding fh: handle %pU, fsid %u\n",
329 refn
= PVFS2_I(parent
)->refn
;
330 PVFS_khandle_to(&refn
.khandle
, (char *) fh
+ 20, 16);
334 gossip_debug(GOSSIP_SUPER_DEBUG
,
335 "Encoding parent: handle %pU, fsid %u\n",
345 static struct export_operations pvfs2_export_ops
= {
346 .encode_fh
= pvfs2_encode_fh
,
347 .fh_to_dentry
= pvfs2_fh_to_dentry
,
350 int pvfs2_fill_sb(struct super_block
*sb
, void *data
, int silent
)
353 struct inode
*root
= NULL
;
354 struct dentry
*root_dentry
= NULL
;
355 struct pvfs2_mount_sb_info_s
*mount_sb_info
=
356 (struct pvfs2_mount_sb_info_s
*) data
;
357 struct pvfs2_object_kref root_object
;
359 /* alloc and init our private pvfs2 sb info */
361 kmalloc(sizeof(struct pvfs2_sb_info_s
), PVFS2_GFP_FLAGS
);
364 memset(sb
->s_fs_info
, 0, sizeof(struct pvfs2_sb_info_s
));
365 PVFS2_SB(sb
)->sb
= sb
;
367 PVFS2_SB(sb
)->root_khandle
= mount_sb_info
->root_khandle
;
368 PVFS2_SB(sb
)->fs_id
= mount_sb_info
->fs_id
;
369 PVFS2_SB(sb
)->id
= mount_sb_info
->id
;
371 if (mount_sb_info
->data
) {
372 ret
= parse_mount_options(sb
, mount_sb_info
->data
,
378 /* Hang the xattr handlers off the superblock */
379 sb
->s_xattr
= pvfs2_xattr_handlers
;
380 sb
->s_magic
= PVFS2_SUPER_MAGIC
;
381 sb
->s_op
= &pvfs2_s_ops
;
382 sb
->s_d_op
= &pvfs2_dentry_operations
;
384 sb
->s_blocksize
= pvfs_bufmap_size_query();
385 sb
->s_blocksize_bits
= pvfs_bufmap_shift_query();
386 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
388 root_object
.khandle
= PVFS2_SB(sb
)->root_khandle
;
389 root_object
.fs_id
= PVFS2_SB(sb
)->fs_id
;
390 gossip_debug(GOSSIP_SUPER_DEBUG
,
391 "get inode %pU, fsid %d\n",
392 &root_object
.khandle
,
395 root
= pvfs2_iget(sb
, &root_object
);
397 return PTR_ERR(root
);
399 gossip_debug(GOSSIP_SUPER_DEBUG
,
400 "Allocated root inode [%p] with mode %x\n",
404 /* allocates and places root dentry in dcache */
405 root_dentry
= d_make_root(root
);
411 sb
->s_export_op
= &pvfs2_export_ops
;
412 sb
->s_root
= root_dentry
;
416 struct dentry
*pvfs2_mount(struct file_system_type
*fst
,
422 struct super_block
*sb
= ERR_PTR(-EINVAL
);
423 struct pvfs2_kernel_op_s
*new_op
;
424 struct pvfs2_mount_sb_info_s mount_sb_info
;
425 struct dentry
*mnt_sb_d
= ERR_PTR(-EINVAL
);
427 gossip_debug(GOSSIP_SUPER_DEBUG
,
428 "pvfs2_mount: called with devname %s\n",
432 gossip_err("ERROR: device name not specified.\n");
433 return ERR_PTR(-EINVAL
);
436 new_op
= op_alloc(PVFS2_VFS_OP_FS_MOUNT
);
438 return ERR_PTR(-ENOMEM
);
440 strncpy(new_op
->upcall
.req
.fs_mount
.pvfs2_config_server
,
442 PVFS_MAX_SERVER_ADDR_LEN
);
444 gossip_debug(GOSSIP_SUPER_DEBUG
,
445 "Attempting PVFS2 Mount via host %s\n",
446 new_op
->upcall
.req
.fs_mount
.pvfs2_config_server
);
448 ret
= service_operation(new_op
, "pvfs2_mount", 0);
449 gossip_debug(GOSSIP_SUPER_DEBUG
,
450 "pvfs2_mount: mount got return value of %d\n", ret
);
454 if (new_op
->downcall
.resp
.fs_mount
.fs_id
== PVFS_FS_ID_NULL
) {
455 gossip_err("ERROR: Retrieved null fs_id\n");
460 /* fill in temporary structure passed to fill_sb method */
461 mount_sb_info
.data
= data
;
462 mount_sb_info
.root_khandle
=
463 new_op
->downcall
.resp
.fs_mount
.root_khandle
;
464 mount_sb_info
.fs_id
= new_op
->downcall
.resp
.fs_mount
.fs_id
;
465 mount_sb_info
.id
= new_op
->downcall
.resp
.fs_mount
.id
;
468 * the mount_sb_info structure looks odd, but it's used because
469 * the private sb info isn't allocated until we call
470 * pvfs2_fill_sb, yet we have the info we need to fill it with
471 * here. so we store it temporarily and pass all of the info
472 * to fill_sb where it's properly copied out
474 mnt_sb_d
= mount_nodev(fst
,
476 (void *)&mount_sb_info
,
478 if (IS_ERR(mnt_sb_d
)) {
479 sb
= ERR_CAST(mnt_sb_d
);
486 * on successful mount, store the devname and data
489 strncpy(PVFS2_SB(sb
)->devname
,
491 PVFS_MAX_SERVER_ADDR_LEN
);
493 /* mount_pending must be cleared */
494 PVFS2_SB(sb
)->mount_pending
= 0;
497 * finally, add this sb to our list of known pvfs2
505 gossip_err("pvfs2_mount: mount request failed with %d\n", ret
);
506 if (ret
== -EINVAL
) {
507 gossip_err("Ensure that all pvfs2-servers have the same FS configuration files\n");
508 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
513 gossip_debug(GOSSIP_SUPER_DEBUG
,
514 "pvfs2_mount: returning dentry %p\n",
519 void pvfs2_kill_sb(struct super_block
*sb
)
521 gossip_debug(GOSSIP_SUPER_DEBUG
, "pvfs2_kill_sb: called\n");
524 * issue the unmount to userspace to tell it to remove the
525 * dynamic mount info it has for this superblock
527 pvfs2_unmount_sb(sb
);
529 /* remove the sb from our list of pvfs2 specific sb's */
532 /* provided sb cleanup */
535 /* free the pvfs2 superblock private data */
539 int pvfs2_inode_cache_initialize(void)
541 pvfs2_inode_cache
= kmem_cache_create("pvfs2_inode_cache",
542 sizeof(struct pvfs2_inode_s
),
544 PVFS2_CACHE_CREATE_FLAGS
,
545 pvfs2_inode_cache_ctor
);
547 if (!pvfs2_inode_cache
) {
548 gossip_err("Cannot create pvfs2_inode_cache\n");
554 int pvfs2_inode_cache_finalize(void)
556 kmem_cache_destroy(pvfs2_inode_cache
);