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>
43 #include "smfs_internal.h"
45 static ssize_t smfs_write(struct file *filp, const char *buf, size_t count,
48 struct inode *cache_inode;
49 struct smfs_file_info *sfi;
55 cache_inode = I2CI(filp->f_dentry->d_inode);
62 if (sfi->magic != SMFS_FILE_MAGIC)
65 if (ppos != &(filp->f_pos)) {
66 cache_ppos = &tmp_ppos;
68 cache_ppos = &sfi->c_file->f_pos;
72 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
74 if (cache_inode->i_fop->write) {
75 rc = cache_inode->i_fop->write(sfi->c_file, buf,
79 SMFS_KML_POST(filp->f_dentry->d_inode, filp->f_dentry,
80 ppos, &count, REINT_WRITE, "write", rc, exit);
82 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
84 duplicate_file(filp, sfi->c_file);
88 int smfs_ioctl(struct inode * inode, struct file * filp,
89 unsigned int cmd, unsigned long arg)
91 struct inode *cache_inode;
92 struct smfs_file_info *sfi;
97 cache_inode = I2CI(filp->f_dentry->d_inode);
102 if (sfi->magic != SMFS_FILE_MAGIC)
105 pre_smfs_inode(inode, cache_inode);
107 if (cache_inode->i_fop->ioctl) {
108 rc = cache_inode->i_fop->ioctl(cache_inode,
109 sfi->c_file, cmd, arg);
112 post_smfs_inode(inode, cache_inode);
113 duplicate_file(filp, sfi->c_file);
118 static ssize_t smfs_read(struct file *filp, char *buf,
119 size_t count, loff_t *ppos)
121 struct inode *cache_inode;
122 struct smfs_file_info *sfi;
129 cache_inode = I2CI(filp->f_dentry->d_inode);
134 if (sfi->magic != SMFS_FILE_MAGIC)
137 if (ppos != &(filp->f_pos)) {
138 cache_ppos = &tmp_ppos;
140 cache_ppos = &sfi->c_file->f_pos;
144 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
146 if (cache_inode->i_fop->read) {
147 rc = cache_inode->i_fop->read(sfi->c_file, buf,
152 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
153 duplicate_file(filp, sfi->c_file);
158 static loff_t smfs_llseek(struct file *file,
162 struct inode *cache_inode;
163 struct smfs_file_info *sfi;
168 cache_inode = I2CI(file->f_dentry->d_inode);
173 if (sfi->magic != SMFS_FILE_MAGIC)
176 pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
178 if (cache_inode->i_fop->llseek) {
179 rc = cache_inode->i_fop->llseek(sfi->c_file,
183 post_smfs_inode(file->f_dentry->d_inode, cache_inode);
184 duplicate_file(file, sfi->c_file);
189 static int smfs_mmap(struct file *file, struct vm_area_struct *vma)
191 struct inode *inode = file->f_dentry->d_inode;
192 struct smfs_file_info *sfi;
193 struct inode *cache_inode = NULL;
197 cache_inode = I2CI(inode);
202 if (sfi->magic != SMFS_FILE_MAGIC)
205 if (cache_inode->i_mapping == &cache_inode->i_data)
206 inode->i_mapping = cache_inode->i_mapping;
208 pre_smfs_inode(inode, cache_inode);
209 if (cache_inode->i_fop->mmap)
210 rc = cache_inode->i_fop->mmap(sfi->c_file, vma);
212 post_smfs_inode(inode, cache_inode);
213 duplicate_file(file, sfi->c_file);
218 static int smfs_init_cache_file(struct inode *inode, struct file *filp)
220 struct smfs_file_info *sfi = NULL;
221 struct file *cache_filp = NULL;
222 struct dentry *cache_dentry = NULL;
226 OBD_ALLOC(sfi, sizeof(struct smfs_file_info));
230 cache_filp = get_empty_filp();
232 GOTO(err_exit, rc = -ENOMEM);
234 sfi->magic = SMFS_FILE_MAGIC;
236 cache_dentry = pre_smfs_dentry(NULL, I2CI(inode), filp->f_dentry);
238 GOTO(err_exit, rc = -ENOMEM);
240 cache_filp->f_vfsmnt = filp->f_vfsmnt;
242 cache_filp->f_dentry = cache_dentry;
243 duplicate_file(cache_filp, filp);
245 sfi->c_file = cache_filp;
247 if (filp->private_data != NULL)
250 filp->private_data = sfi;
255 OBD_FREE(sfi, sizeof(struct smfs_file_info));
257 put_filp(cache_filp);
261 static int smfs_cleanup_cache_file(struct file *filp)
263 struct smfs_file_info *sfi = NULL;
271 post_smfs_dentry(sfi->c_file->f_dentry);
273 put_filp(sfi->c_file);
275 OBD_FREE(sfi, sizeof(struct smfs_file_info));
277 filp->private_data = NULL;
282 int smfs_open(struct inode *inode, struct file *filp)
284 struct inode *cache_inode = NULL;
288 cache_inode = I2CI(inode);
292 if ((rc = smfs_init_cache_file(inode, filp)))
295 pre_smfs_inode(inode, cache_inode);
296 if (cache_inode->i_fop->open)
297 rc = cache_inode->i_fop->open(cache_inode, F2CF(filp));
299 post_smfs_inode(inode, cache_inode);
300 duplicate_file(filp, F2CF(filp));
304 int smfs_release(struct inode *inode, struct file *filp)
306 struct inode *cache_inode = NULL;
307 struct file *cache_file = NULL;
308 struct smfs_file_info *sfi = NULL;
312 cache_inode = I2CI(inode);
317 if (sfi->magic != SMFS_FILE_MAGIC)
319 cache_file = sfi->c_file;
321 pre_smfs_inode(inode, cache_inode);
322 if (cache_inode->i_fop->release)
323 rc = cache_inode->i_fop->release(cache_inode, cache_file);
325 post_smfs_inode(inode, cache_inode);
326 duplicate_file(filp, cache_file);
328 smfs_cleanup_cache_file(filp);
332 int smfs_fsync(struct file *file, struct dentry *dentry, int datasync)
334 struct smfs_file_info *sfi = NULL;
335 struct dentry *cache_dentry = NULL;
336 struct file *cache_file = NULL;
337 struct inode *cache_inode;
340 cache_inode = I2CI(dentry->d_inode);
344 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
350 if (sfi->magic != SMFS_FILE_MAGIC)
352 cache_file = sfi->c_file;
355 pre_smfs_inode(dentry->d_inode, cache_inode);
357 if (cache_inode->i_fop->fsync) {
358 rc = cache_inode->i_fop->fsync(cache_file,
359 cache_dentry, datasync);
362 post_smfs_inode(dentry->d_inode, cache_inode);
363 duplicate_file(file, cache_file);
364 post_smfs_dentry(cache_dentry);
369 struct file_operations smfs_file_fops = {
376 release: smfs_release,
380 static void smfs_truncate(struct inode *inode)
382 struct inode *cache_inode;
384 cache_inode = I2CI(inode);
392 pre_smfs_inode(inode, cache_inode);
393 if (cache_inode->i_op->truncate)
394 cache_inode->i_op->truncate(cache_inode);
396 post_smfs_inode(inode, cache_inode);
401 int smfs_setattr(struct dentry *dentry, struct iattr *attr)
403 struct inode *cache_inode;
404 struct dentry *cache_dentry;
408 cache_inode = I2CI(dentry->d_inode);
412 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
416 handle = smfs_trans_start(dentry->d_inode, FSFILT_OP_SETATTR, NULL);
417 if (IS_ERR(handle) ) {
418 CERROR("smfs_do_mkdir: no space for transaction\n");
422 pre_smfs_inode(dentry->d_inode, cache_inode);
424 if (cache_inode->i_op->setattr)
425 rc = cache_inode->i_op->setattr(cache_dentry, attr);
427 SMFS_KML_POST(dentry->d_inode, dentry, attr, NULL,
428 REINT_SETATTR, "setattr", rc, exit);
430 post_smfs_inode(dentry->d_inode, cache_inode);
431 post_smfs_dentry(cache_dentry);
432 smfs_trans_commit(dentry->d_inode, handle, 0);
436 int smfs_setxattr(struct dentry *dentry, const char *name, const void *value,
437 size_t size, int flags)
439 struct inode *cache_inode;
440 struct dentry *cache_dentry;
443 cache_inode = I2CI(dentry->d_inode);
447 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
451 pre_smfs_inode(dentry->d_inode, cache_inode);
453 if (cache_inode->i_op->setxattr)
454 rc = cache_inode->i_op->setxattr(cache_dentry, name, value,
457 post_smfs_inode(dentry->d_inode, cache_inode);
458 post_smfs_dentry(cache_dentry);
463 int smfs_getxattr(struct dentry *dentry, const char *name, void *buffer,
466 struct inode *cache_inode;
467 struct dentry *cache_dentry;
470 cache_inode = I2CI(dentry->d_inode);
474 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
478 pre_smfs_inode(dentry->d_inode, cache_inode);
480 if (cache_inode->i_op->getattr)
481 rc = cache_inode->i_op->getxattr(cache_dentry, name, buffer,
484 post_smfs_inode(dentry->d_inode, cache_inode);
485 post_smfs_dentry(cache_dentry);
490 ssize_t smfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
492 struct inode *cache_inode;
493 struct dentry *cache_dentry;
496 cache_inode = I2CI(dentry->d_inode);
500 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
504 pre_smfs_inode(dentry->d_inode, cache_inode);
506 if (cache_inode->i_op->listxattr)
507 rc = cache_inode->i_op->listxattr(cache_dentry, buffer, size);
509 post_smfs_inode(dentry->d_inode, cache_inode);
510 post_smfs_dentry(cache_dentry);
515 int smfs_removexattr(struct dentry *dentry, const char *name)
517 struct inode *cache_inode;
518 struct dentry *cache_dentry;
521 cache_inode = I2CI(dentry->d_inode);
525 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
529 pre_smfs_inode(dentry->d_inode, cache_inode);
531 if (cache_inode->i_op->removexattr)
532 rc = cache_inode->i_op->removexattr(cache_dentry, name);
534 post_smfs_inode(dentry->d_inode, cache_inode);
535 post_smfs_dentry(cache_dentry);
540 struct inode_operations smfs_file_iops = {
541 truncate: smfs_truncate, /* BKL held */
542 setattr: smfs_setattr, /* BKL held */
543 setxattr: smfs_setxattr, /* BKL held */
544 getxattr: smfs_getxattr, /* BKL held */
545 listxattr: smfs_listxattr, /* BKL held */
546 removexattr: smfs_removexattr, /* BKL held */