1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 * Lustre filesystem abstraction routines
7 * Copyright (C) 2004 Cluster File Systems, Inc.
9 * This file is part of Lustre, http://www.lustre.org.
11 * Lustre is free software; you can redistribute it and/or
12 * modify it under the terms of version 2 of the GNU General Public
13 * License as published by the Free Software Foundation.
15 * Lustre is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with Lustre; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #define DEBUG_SUBSYSTEM S_SM
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31 #include <linux/stat.h>
32 #include <linux/unistd.h>
33 #include <linux/pagemap.h>
34 #include <linux/file.h>
36 #include <linux/obd_class.h>
37 #include <linux/obd_support.h>
38 #include <linux/lustre_lib.h>
39 #include <linux/lustre_idl.h>
40 #include <linux/lustre_fsfilt.h>
41 #include <linux/lustre_smfs.h>
42 #include <linux/lustre_snap.h>
44 #include "smfs_internal.h"
46 static ssize_t smfs_write(struct file *filp, const char *buf, size_t count,
49 struct inode *cache_inode;
50 struct smfs_file_info *sfi;
56 cache_inode = I2CI(filp->f_dentry->d_inode);
63 if (sfi->magic != SMFS_FILE_MAGIC)
66 if (filp->f_flags & O_APPEND)
67 tmp_ppos = filp->f_dentry->d_inode->i_size;
71 SMFS_HOOK(filp->f_dentry->d_inode, filp->f_dentry, &count, &tmp_ppos,
72 HOOK_WRITE, NULL, PRE_HOOK, rc, exit);
74 if (ppos != &(filp->f_pos)) {
75 cache_ppos = &tmp_ppos;
77 cache_ppos = &sfi->c_file->f_pos;
81 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
83 if (cache_inode->i_fop->write) {
84 rc = cache_inode->i_fop->write(sfi->c_file, buf,
88 SMFS_HOOK(filp->f_dentry->d_inode, filp->f_dentry, ppos, &count,
89 HOOK_WRITE, NULL, POST_HOOK, rc, exit);
91 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
93 duplicate_file(filp, sfi->c_file);
97 int smfs_ioctl(struct inode * inode, struct file * filp,
98 unsigned int cmd, unsigned long arg)
100 struct inode *cache_inode;
101 struct smfs_file_info *sfi;
106 cache_inode = I2CI(filp->f_dentry->d_inode);
111 if (sfi->magic != SMFS_FILE_MAGIC)
114 pre_smfs_inode(inode, cache_inode);
116 if (cache_inode->i_fop->ioctl) {
117 rc = cache_inode->i_fop->ioctl(cache_inode,
118 sfi->c_file, cmd, arg);
121 post_smfs_inode(inode, cache_inode);
122 duplicate_file(filp, sfi->c_file);
127 static ssize_t smfs_read(struct file *filp, char *buf,
128 size_t count, loff_t *ppos)
130 struct inode *cache_inode;
131 struct smfs_file_info *sfi;
138 cache_inode = I2CI(filp->f_dentry->d_inode);
143 if (sfi->magic != SMFS_FILE_MAGIC)
146 if (ppos != &(filp->f_pos)) {
147 cache_ppos = &tmp_ppos;
149 cache_ppos = &sfi->c_file->f_pos;
153 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
155 if (cache_inode->i_fop->read) {
156 rc = cache_inode->i_fop->read(sfi->c_file, buf,
161 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
162 duplicate_file(filp, sfi->c_file);
167 static loff_t smfs_llseek(struct file *file,
171 struct inode *cache_inode;
172 struct smfs_file_info *sfi;
177 cache_inode = I2CI(file->f_dentry->d_inode);
182 if (sfi->magic != SMFS_FILE_MAGIC)
185 pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
187 if (cache_inode->i_fop->llseek) {
188 rc = cache_inode->i_fop->llseek(sfi->c_file,
192 post_smfs_inode(file->f_dentry->d_inode, cache_inode);
193 duplicate_file(file, sfi->c_file);
198 static int smfs_mmap(struct file *file, struct vm_area_struct *vma)
200 struct inode *inode = file->f_dentry->d_inode;
201 struct smfs_file_info *sfi;
202 struct inode *cache_inode = NULL;
206 cache_inode = I2CI(inode);
211 if (sfi->magic != SMFS_FILE_MAGIC)
214 if (cache_inode->i_mapping == &cache_inode->i_data)
215 inode->i_mapping = cache_inode->i_mapping;
217 pre_smfs_inode(inode, cache_inode);
218 if (cache_inode->i_fop->mmap)
219 rc = cache_inode->i_fop->mmap(sfi->c_file, vma);
221 post_smfs_inode(inode, cache_inode);
222 duplicate_file(file, sfi->c_file);
227 static int smfs_init_cache_file(struct inode *inode, struct file *filp)
229 struct smfs_file_info *sfi = NULL;
230 struct file *cache_filp = NULL;
231 struct dentry *cache_dentry = NULL;
235 OBD_ALLOC(sfi, sizeof(struct smfs_file_info));
239 cache_filp = get_empty_filp();
241 GOTO(err_exit, rc = -ENOMEM);
243 sfi->magic = SMFS_FILE_MAGIC;
245 cache_dentry = pre_smfs_dentry(NULL, I2CI(inode), filp->f_dentry);
247 GOTO(err_exit, rc = -ENOMEM);
249 cache_filp->f_vfsmnt = filp->f_vfsmnt;
251 cache_filp->f_dentry = cache_dentry;
252 duplicate_file(cache_filp, filp);
254 sfi->c_file = cache_filp;
256 if (filp->private_data != NULL)
259 filp->private_data = sfi;
264 OBD_FREE(sfi, sizeof(struct smfs_file_info));
266 put_filp(cache_filp);
270 static int smfs_cleanup_cache_file(struct file *filp)
272 struct smfs_file_info *sfi = NULL;
280 post_smfs_dentry(sfi->c_file->f_dentry);
282 put_filp(sfi->c_file);
284 OBD_FREE(sfi, sizeof(struct smfs_file_info));
286 filp->private_data = NULL;
291 int smfs_open(struct inode *inode, struct file *filp)
293 struct inode *cache_inode = NULL;
297 cache_inode = I2CI(inode);
301 if ((rc = smfs_init_cache_file(inode, filp)))
304 pre_smfs_inode(inode, cache_inode);
305 if (cache_inode->i_fop->open)
306 rc = cache_inode->i_fop->open(cache_inode, F2CF(filp));
308 post_smfs_inode(inode, cache_inode);
309 duplicate_file(filp, F2CF(filp));
313 int smfs_release(struct inode *inode, struct file *filp)
315 struct inode *cache_inode = NULL;
316 struct file *cache_file = NULL;
317 struct smfs_file_info *sfi = NULL;
321 cache_inode = I2CI(inode);
326 if (sfi->magic != SMFS_FILE_MAGIC)
328 cache_file = sfi->c_file;
330 pre_smfs_inode(inode, cache_inode);
331 if (cache_inode->i_fop->release)
332 rc = cache_inode->i_fop->release(cache_inode, cache_file);
334 post_smfs_inode(inode, cache_inode);
335 duplicate_file(filp, cache_file);
337 smfs_cleanup_cache_file(filp);
341 int smfs_fsync(struct file *file, struct dentry *dentry, int datasync)
343 struct smfs_file_info *sfi = NULL;
344 struct dentry *cache_dentry = NULL;
345 struct file *cache_file = NULL;
346 struct inode *cache_inode;
349 cache_inode = I2CI(dentry->d_inode);
353 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
359 if (sfi->magic != SMFS_FILE_MAGIC)
361 cache_file = sfi->c_file;
364 pre_smfs_inode(dentry->d_inode, cache_inode);
366 if (cache_inode->i_fop->fsync) {
367 rc = cache_inode->i_fop->fsync(cache_file,
368 cache_dentry, datasync);
371 post_smfs_inode(dentry->d_inode, cache_inode);
372 duplicate_file(file, cache_file);
373 post_smfs_dentry(cache_dentry);
378 struct file_operations smfs_file_fops = {
385 release: smfs_release,
389 static void smfs_truncate(struct inode *inode)
391 struct inode *cache_inode;
393 cache_inode = I2CI(inode);
401 pre_smfs_inode(inode, cache_inode);
402 if (cache_inode->i_op->truncate)
403 cache_inode->i_op->truncate(cache_inode);
405 post_smfs_inode(inode, cache_inode);
410 int smfs_setattr(struct dentry *dentry, struct iattr *attr)
412 struct inode *cache_inode;
413 struct dentry *cache_dentry;
417 cache_inode = I2CI(dentry->d_inode);
421 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
425 handle = smfs_trans_start(dentry->d_inode, FSFILT_OP_SETATTR, NULL);
426 if (IS_ERR(handle) ) {
427 CERROR("smfs_do_mkdir: no space for transaction\n");
431 pre_smfs_inode(dentry->d_inode, cache_inode);
433 if (cache_inode->i_op->setattr)
434 rc = cache_inode->i_op->setattr(cache_dentry, attr);
436 SMFS_HOOK(dentry->d_inode, dentry, attr, NULL, HOOK_SETATTR, NULL,
437 POST_HOOK, rc, exit);
440 post_smfs_inode(dentry->d_inode, cache_inode);
441 post_smfs_dentry(cache_dentry);
442 smfs_trans_commit(dentry->d_inode, handle, 0);
446 int smfs_setxattr(struct dentry *dentry, const char *name, const void *value,
447 size_t size, int flags)
449 struct inode *cache_inode;
450 struct dentry *cache_dentry;
453 cache_inode = I2CI(dentry->d_inode);
457 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
461 pre_smfs_inode(dentry->d_inode, cache_inode);
463 if (cache_inode->i_op->setxattr)
464 rc = cache_inode->i_op->setxattr(cache_dentry, name, value,
467 post_smfs_inode(dentry->d_inode, cache_inode);
468 post_smfs_dentry(cache_dentry);
473 int smfs_getxattr(struct dentry *dentry, const char *name, void *buffer,
476 struct inode *cache_inode;
477 struct dentry *cache_dentry;
480 cache_inode = I2CI(dentry->d_inode);
484 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
488 pre_smfs_inode(dentry->d_inode, cache_inode);
490 if (cache_inode->i_op->getattr)
491 rc = cache_inode->i_op->getxattr(cache_dentry, name, buffer,
494 post_smfs_inode(dentry->d_inode, cache_inode);
495 post_smfs_dentry(cache_dentry);
500 ssize_t smfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
502 struct inode *cache_inode;
503 struct dentry *cache_dentry;
506 cache_inode = I2CI(dentry->d_inode);
510 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
514 pre_smfs_inode(dentry->d_inode, cache_inode);
516 if (cache_inode->i_op->listxattr)
517 rc = cache_inode->i_op->listxattr(cache_dentry, buffer, size);
519 post_smfs_inode(dentry->d_inode, cache_inode);
520 post_smfs_dentry(cache_dentry);
525 int smfs_removexattr(struct dentry *dentry, const char *name)
527 struct inode *cache_inode;
528 struct dentry *cache_dentry;
531 cache_inode = I2CI(dentry->d_inode);
535 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
539 pre_smfs_inode(dentry->d_inode, cache_inode);
541 if (cache_inode->i_op->removexattr)
542 rc = cache_inode->i_op->removexattr(cache_dentry, name);
544 post_smfs_inode(dentry->d_inode, cache_inode);
545 post_smfs_dentry(cache_dentry);
550 struct inode_operations smfs_file_iops = {
551 truncate: smfs_truncate, /* BKL held */
552 setattr: smfs_setattr, /* BKL held */
553 setxattr: smfs_setxattr, /* BKL held */
554 getxattr: smfs_getxattr, /* BKL held */
555 listxattr: smfs_listxattr, /* BKL held */
556 removexattr: smfs_removexattr, /* BKL held */