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) BUG();
64 if (ppos != &(filp->f_pos)) {
65 cache_ppos = &tmp_ppos;
67 cache_ppos = &sfi->c_file->f_pos;
71 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
73 if (cache_inode->i_fop->write) {
74 rc = cache_inode->i_fop->write(sfi->c_file, buf,
78 SMFS_KML_POST(filp->f_dentry->d_inode, filp->f_dentry,
79 ppos, &count, REINT_WRITE, "write", rc, exit);
81 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
83 duplicate_file(filp, sfi->c_file);
87 int smfs_ioctl(struct inode * inode, struct file * filp,
88 unsigned int cmd, unsigned long arg)
90 struct inode *cache_inode;
91 struct smfs_file_info *sfi;
96 cache_inode = I2CI(filp->f_dentry->d_inode);
101 if (sfi->magic != SMFS_FILE_MAGIC) BUG();
103 pre_smfs_inode(inode, cache_inode);
105 if (cache_inode->i_fop->ioctl) {
106 rc = cache_inode->i_fop->ioctl(cache_inode,
107 sfi->c_file, cmd, arg);
110 post_smfs_inode(inode, cache_inode);
111 duplicate_file(filp, sfi->c_file);
116 static ssize_t smfs_read(struct file *filp, char *buf,
117 size_t count, loff_t *ppos)
119 struct inode *cache_inode;
120 struct smfs_file_info *sfi;
127 cache_inode = I2CI(filp->f_dentry->d_inode);
132 if (sfi->magic != SMFS_FILE_MAGIC) BUG();
134 if (ppos != &(filp->f_pos)) {
135 cache_ppos = &tmp_ppos;
137 cache_ppos = &sfi->c_file->f_pos;
141 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
143 if (cache_inode->i_fop->read) {
144 rc = cache_inode->i_fop->read(sfi->c_file, buf,
149 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
150 duplicate_file(filp, sfi->c_file);
155 static loff_t smfs_llseek(struct file *file,
159 struct inode *cache_inode;
160 struct smfs_file_info *sfi;
165 cache_inode = I2CI(file->f_dentry->d_inode);
170 if (sfi->magic != SMFS_FILE_MAGIC) BUG();
172 pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
174 if (cache_inode->i_fop->llseek) {
175 rc = cache_inode->i_fop->llseek(sfi->c_file,
179 post_smfs_inode(file->f_dentry->d_inode, cache_inode);
180 duplicate_file(file, sfi->c_file);
185 static int smfs_mmap(struct file *file, struct vm_area_struct *vma)
187 struct inode *inode = file->f_dentry->d_inode;
188 struct smfs_file_info *sfi;
189 struct inode *cache_inode = NULL;
193 cache_inode = I2CI(inode);
198 if (sfi->magic != SMFS_FILE_MAGIC)
201 if (cache_inode->i_mapping == &cache_inode->i_data)
202 inode->i_mapping = cache_inode->i_mapping;
204 pre_smfs_inode(inode, cache_inode);
205 if (cache_inode->i_fop->mmap)
206 rc = cache_inode->i_fop->mmap(sfi->c_file, vma);
208 post_smfs_inode(inode, cache_inode);
209 duplicate_file(file, sfi->c_file);
214 static int smfs_init_cache_file(struct inode *inode, struct file *filp)
216 struct smfs_file_info *sfi = NULL;
217 struct file *cache_filp = NULL;
218 struct dentry *cache_dentry = NULL;
222 OBD_ALLOC(sfi, sizeof(struct smfs_file_info));
226 cache_filp = get_empty_filp();
228 GOTO(err_exit, rc = -ENOMEM);
230 sfi->magic = SMFS_FILE_MAGIC;
232 cache_dentry = pre_smfs_dentry(NULL, I2CI(inode), filp->f_dentry);
234 GOTO(err_exit, rc = -ENOMEM);
236 cache_filp->f_vfsmnt = filp->f_vfsmnt;
238 cache_filp->f_dentry = cache_dentry;
239 duplicate_file(cache_filp, filp);
241 sfi->c_file = cache_filp;
243 if (filp->private_data != NULL)
246 filp->private_data = sfi;
251 OBD_FREE(sfi, sizeof(struct smfs_file_info));
253 put_filp(cache_filp);
257 static int smfs_cleanup_cache_file(struct file *filp)
259 struct smfs_file_info *sfi = NULL;
265 post_smfs_dentry(sfi->c_file->f_dentry);
267 put_filp(sfi->c_file);
269 OBD_FREE(sfi, sizeof(struct smfs_file_info));
271 filp->private_data = NULL;
276 int smfs_open(struct inode *inode, struct file *filp)
278 struct inode *cache_inode = NULL;
282 cache_inode = I2CI(inode);
286 if ((rc = smfs_init_cache_file(inode, filp)))
289 pre_smfs_inode(inode, cache_inode);
290 if (cache_inode->i_fop->open)
291 rc = cache_inode->i_fop->open(cache_inode, F2CF(filp));
293 post_smfs_inode(inode, cache_inode);
294 duplicate_file(filp, F2CF(filp));
298 int smfs_release(struct inode *inode, struct file *filp)
300 struct inode *cache_inode = NULL;
301 struct smfs_file_info *sfi = NULL;
305 cache_inode = I2CI(inode);
310 if (sfi->magic != SMFS_FILE_MAGIC)
313 pre_smfs_inode(inode, cache_inode);
314 if (cache_inode->i_fop->release)
315 rc = cache_inode->i_fop->release(cache_inode, sfi->c_file);
317 post_smfs_inode(inode, cache_inode);
318 duplicate_file(filp, sfi->c_file);
320 smfs_cleanup_cache_file(filp);
324 int smfs_fsync(struct file *file, struct dentry *dentry, int datasync)
326 struct smfs_file_info *sfi = NULL;
327 struct inode *cache_inode;
330 cache_inode = I2CI(file->f_dentry->d_inode);
335 if (sfi->magic != SMFS_FILE_MAGIC)
338 pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
340 if (cache_inode->i_fop->fsync)
341 rc = cache_inode->i_fop->fsync(sfi->c_file,
342 sfi->c_file->f_dentry, datasync);
344 post_smfs_inode(file->f_dentry->d_inode, cache_inode);
345 duplicate_file(file, sfi->c_file);
350 struct file_operations smfs_file_fops = {
357 release: smfs_release,
361 static void smfs_truncate(struct inode *inode)
363 struct inode *cache_inode;
365 cache_inode = I2CI(inode);
373 pre_smfs_inode(inode, cache_inode);
374 if (cache_inode->i_op->truncate)
375 cache_inode->i_op->truncate(cache_inode);
377 post_smfs_inode(inode, cache_inode);
382 int smfs_setattr(struct dentry *dentry, struct iattr *attr)
384 struct inode *cache_inode;
385 struct dentry *cache_dentry;
389 cache_inode = I2CI(dentry->d_inode);
393 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
397 handle = smfs_trans_start(dentry->d_inode, FSFILT_OP_SETATTR, NULL);
398 if (IS_ERR(handle) ) {
399 CERROR("smfs_do_mkdir: no space for transaction\n");
403 pre_smfs_inode(dentry->d_inode, cache_inode);
405 if (cache_inode->i_op->setattr)
406 rc = cache_inode->i_op->setattr(cache_dentry, attr);
408 SMFS_KML_POST(dentry->d_inode, dentry, attr, NULL,
409 REINT_SETATTR, "setattr", rc, exit);
411 post_smfs_inode(dentry->d_inode, cache_inode);
412 post_smfs_dentry(cache_dentry);
413 smfs_trans_commit(dentry->d_inode, handle, 0);
417 int smfs_setxattr(struct dentry *dentry, const char *name, const void *value,
418 size_t size, int flags)
420 struct inode *cache_inode;
421 struct dentry *cache_dentry;
424 cache_inode = I2CI(dentry->d_inode);
428 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
432 pre_smfs_inode(dentry->d_inode, cache_inode);
434 if (cache_inode->i_op->setxattr)
435 rc = cache_inode->i_op->setxattr(cache_dentry, name, value,
438 post_smfs_inode(dentry->d_inode, cache_inode);
439 post_smfs_dentry(cache_dentry);
444 int smfs_getxattr(struct dentry *dentry, const char *name, void *buffer,
447 struct inode *cache_inode;
448 struct dentry *cache_dentry;
451 cache_inode = I2CI(dentry->d_inode);
455 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
459 pre_smfs_inode(dentry->d_inode, cache_inode);
461 if (cache_inode->i_op->getattr)
462 rc = cache_inode->i_op->getxattr(cache_dentry, name, buffer,
465 post_smfs_inode(dentry->d_inode, cache_inode);
466 post_smfs_dentry(cache_dentry);
471 ssize_t smfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
473 struct inode *cache_inode;
474 struct dentry *cache_dentry;
477 cache_inode = I2CI(dentry->d_inode);
481 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
485 pre_smfs_inode(dentry->d_inode, cache_inode);
487 if (cache_inode->i_op->listxattr)
488 rc = cache_inode->i_op->listxattr(cache_dentry, buffer, size);
490 post_smfs_inode(dentry->d_inode, cache_inode);
491 post_smfs_dentry(cache_dentry);
496 int smfs_removexattr(struct dentry *dentry, const char *name)
498 struct inode *cache_inode;
499 struct dentry *cache_dentry;
502 cache_inode = I2CI(dentry->d_inode);
506 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
510 pre_smfs_inode(dentry->d_inode, cache_inode);
512 if (cache_inode->i_op->removexattr)
513 rc = cache_inode->i_op->removexattr(cache_dentry, name);
515 post_smfs_inode(dentry->d_inode, cache_inode);
516 post_smfs_dentry(cache_dentry);
521 struct inode_operations smfs_file_iops = {
522 truncate: smfs_truncate, /* BKL held */
523 setattr: smfs_setattr, /* BKL held */
524 setxattr: smfs_setxattr, /* BKL held */
525 getxattr: smfs_getxattr, /* BKL held */
526 listxattr: smfs_listxattr, /* BKL held */
527 removexattr: smfs_removexattr, /* BKL held */