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;
52 loff_t *cache_ppos = NULL;
56 cache_inode = I2CI(filp->f_dentry->d_inode);
58 if (!cache_inode || !cache_inode->i_fop->write)
63 if (sfi->magic != SMFS_FILE_MAGIC)
66 if (filp->f_flags & O_APPEND)
67 tmp_ppos = filp->f_dentry->d_inode->i_size;
72 SMFS_HOOK(filp->f_dentry->d_inode, filp->f_dentry, &count, &tmp_ppos,
73 HOOK_WRITE, NULL, PRE_HOOK, rc, exit);
75 if (ppos != &(filp->f_pos)) {
76 cache_ppos = &tmp_ppos;
78 cache_ppos = &sfi->c_file->f_pos;
83 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
85 rc = cache_inode->i_fop->write(sfi->c_file, buf, count,
88 SMFS_HOOK(filp->f_dentry->d_inode, filp->f_dentry, ppos, &count,
89 HOOK_WRITE, NULL, POST_HOOK, rc, exit);
92 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
94 duplicate_file(filp, sfi->c_file);
98 int smfs_ioctl(struct inode * inode, struct file * filp,
99 unsigned int cmd, unsigned long arg)
101 struct inode *cache_inode;
102 struct smfs_file_info *sfi;
107 cache_inode = I2CI(filp->f_dentry->d_inode);
108 if (!cache_inode || !cache_inode->i_fop->ioctl)
112 if (sfi->magic != SMFS_FILE_MAGIC)
115 pre_smfs_inode(inode, cache_inode);
117 rc = cache_inode->i_fop->ioctl(cache_inode, sfi->c_file, cmd, arg);
119 post_smfs_inode(inode, cache_inode);
120 duplicate_file(filp, sfi->c_file);
125 static ssize_t smfs_read(struct file *filp, char *buf,
126 size_t count, loff_t *ppos)
128 struct inode *cache_inode;
129 struct smfs_file_info *sfi;
131 loff_t *cache_ppos = NULL;
136 cache_inode = I2CI(filp->f_dentry->d_inode);
137 if (!cache_inode || !cache_inode->i_fop->read)
141 if (sfi->magic != SMFS_FILE_MAGIC)
144 if (ppos != &(filp->f_pos)) {
145 cache_ppos = &tmp_ppos;
147 cache_ppos = &sfi->c_file->f_pos;
151 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
153 rc = cache_inode->i_fop->read(sfi->c_file, buf, count, cache_ppos);
156 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
157 duplicate_file(filp, sfi->c_file);
162 static loff_t smfs_llseek(struct file *file,
166 struct inode *cache_inode;
167 struct smfs_file_info *sfi;
172 cache_inode = I2CI(file->f_dentry->d_inode);
173 if (!cache_inode || !cache_inode->i_fop->llseek)
177 if (sfi->magic != SMFS_FILE_MAGIC)
180 pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
182 rc = cache_inode->i_fop->llseek(sfi->c_file, offset, origin);
184 post_smfs_inode(file->f_dentry->d_inode, cache_inode);
185 duplicate_file(file, sfi->c_file);
190 static int smfs_mmap(struct file *file, struct vm_area_struct *vma)
192 struct inode *inode = file->f_dentry->d_inode;
193 struct smfs_file_info *sfi;
194 struct inode *cache_inode = NULL;
198 cache_inode = I2CI(inode);
203 if (sfi->magic != SMFS_FILE_MAGIC)
206 if (cache_inode->i_mapping == &cache_inode->i_data)
207 inode->i_mapping = cache_inode->i_mapping;
209 pre_smfs_inode(inode, cache_inode);
211 rc = cache_inode->i_fop->mmap(sfi->c_file, vma);
213 post_smfs_inode(inode, cache_inode);
214 duplicate_file(file, sfi->c_file);
219 static int smfs_init_cache_file(struct inode *inode, struct file *filp)
221 struct smfs_file_info *sfi = NULL;
222 struct file *cache_filp = NULL;
223 struct dentry *cache_dentry = NULL;
227 OBD_ALLOC(sfi, sizeof(struct smfs_file_info));
231 cache_filp = get_empty_filp();
233 GOTO(err_exit, rc = -ENOMEM);
235 sfi->magic = SMFS_FILE_MAGIC;
237 cache_dentry = pre_smfs_dentry(NULL, I2CI(inode), filp->f_dentry);
239 GOTO(err_exit, rc = -ENOMEM);
241 cache_filp->f_vfsmnt = filp->f_vfsmnt;
243 cache_filp->f_dentry = cache_dentry;
244 duplicate_file(cache_filp, filp);
246 sfi->c_file = cache_filp;
248 if (filp->private_data != NULL)
251 filp->private_data = sfi;
256 OBD_FREE(sfi, sizeof(struct smfs_file_info));
258 put_filp(cache_filp);
262 static int smfs_cleanup_cache_file(struct file *filp)
264 struct smfs_file_info *sfi = NULL;
272 post_smfs_dentry(sfi->c_file->f_dentry);
274 put_filp(sfi->c_file);
276 OBD_FREE(sfi, sizeof(struct smfs_file_info));
278 filp->private_data = NULL;
283 int smfs_open(struct inode *inode, struct file *filp)
285 struct inode *cache_inode = NULL;
289 cache_inode = I2CI(inode);
293 if ((rc = smfs_init_cache_file(inode, filp)))
296 if (cache_inode->i_fop->open) {
297 rc = cache_inode->i_fop->open(cache_inode, F2CF(filp));
298 duplicate_file(filp, F2CF(filp));
303 int smfs_release(struct inode *inode, struct file *filp)
305 struct inode *cache_inode = NULL;
306 struct file *cache_file = NULL;
307 struct smfs_file_info *sfi = NULL;
311 cache_inode = I2CI(inode);
317 if (sfi->magic != SMFS_FILE_MAGIC)
319 cache_file = sfi->c_file;
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);
327 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);
341 if (!cache_inode || !cache_inode->i_fop->fsync)
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 rc = cache_inode->i_fop->fsync(cache_file,
358 cache_dentry, datasync);
360 post_smfs_inode(dentry->d_inode, cache_inode);
361 duplicate_file(file, cache_file);
362 post_smfs_dentry(cache_dentry);
367 struct file_operations smfs_file_fops = {
374 release: smfs_release,
378 static void smfs_truncate(struct inode *inode)
380 struct inode *cache_inode = I2CI(inode);
382 if (!cache_inode || !cache_inode->i_op->truncate)
385 pre_smfs_inode(inode, cache_inode);
387 cache_inode->i_op->truncate(cache_inode);
389 post_smfs_inode(inode, cache_inode);
394 int smfs_setattr(struct dentry *dentry, struct iattr *attr)
396 struct inode *cache_inode;
397 struct dentry *cache_dentry;
401 cache_inode = I2CI(dentry->d_inode);
402 if (!cache_inode || !cache_inode->i_op->setattr)
405 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
409 handle = smfs_trans_start(dentry->d_inode, FSFILT_OP_SETATTR, NULL);
410 if (IS_ERR(handle) ) {
411 CERROR("smfs_do_mkdir: no space for transaction\n");
412 GOTO(exit, rc = -ENOSPC);
415 pre_smfs_inode(dentry->d_inode, cache_inode);
417 SMFS_HOOK(dentry->d_inode, dentry, attr, NULL, HOOK_SETATTR, NULL,
420 rc = cache_inode->i_op->setattr(cache_dentry, attr);
422 post_smfs_dentry(cache_dentry);
424 SMFS_HOOK(dentry->d_inode, dentry, attr, NULL, HOOK_SETATTR, NULL,
425 POST_HOOK, rc, exit);
427 post_smfs_inode(dentry->d_inode, cache_inode);
430 smfs_trans_commit(dentry->d_inode, handle, 0);
434 int smfs_setxattr(struct dentry *dentry, const char *name, const void *value,
435 size_t size, int flags)
437 struct inode *cache_inode;
438 struct dentry *cache_dentry;
441 cache_inode = I2CI(dentry->d_inode);
442 if (!cache_inode || !cache_inode->i_op->setxattr)
445 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
449 pre_smfs_inode(dentry->d_inode, cache_inode);
451 rc = cache_inode->i_op->setxattr(cache_dentry, name, value,
454 post_smfs_inode(dentry->d_inode, cache_inode);
455 post_smfs_dentry(cache_dentry);
460 int smfs_getxattr(struct dentry *dentry, const char *name, void *buffer,
463 struct inode *cache_inode;
464 struct dentry *cache_dentry;
467 cache_inode = I2CI(dentry->d_inode);
468 if (!cache_inode || !cache_inode->i_op->getattr)
471 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
475 pre_smfs_inode(dentry->d_inode, cache_inode);
477 rc = cache_inode->i_op->getxattr(cache_dentry, name, buffer,
480 post_smfs_inode(dentry->d_inode, cache_inode);
481 post_smfs_dentry(cache_dentry);
486 ssize_t smfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
488 struct inode *cache_inode;
489 struct dentry *cache_dentry;
492 cache_inode = I2CI(dentry->d_inode);
493 if (!cache_inode || !cache_inode->i_op->listxattr)
496 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
500 pre_smfs_inode(dentry->d_inode, cache_inode);
502 rc = cache_inode->i_op->listxattr(cache_dentry, buffer, size);
504 post_smfs_inode(dentry->d_inode, cache_inode);
505 post_smfs_dentry(cache_dentry);
510 int smfs_removexattr(struct dentry *dentry, const char *name)
512 struct inode *cache_inode;
513 struct dentry *cache_dentry;
516 cache_inode = I2CI(dentry->d_inode);
517 if (!cache_inode || !cache_inode->i_op->removexattr)
520 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
524 pre_smfs_inode(dentry->d_inode, cache_inode);
526 rc = cache_inode->i_op->removexattr(cache_dentry, name);
528 post_smfs_inode(dentry->d_inode, cache_inode);
529 post_smfs_dentry(cache_dentry);
534 struct inode_operations smfs_file_iops = {
535 .truncate = smfs_truncate, /* BKL held */
536 .setattr = smfs_setattr, /* BKL held */
537 .setxattr = smfs_setxattr, /* BKL held */
538 .getxattr = smfs_getxattr, /* BKL held */
539 .listxattr = smfs_listxattr, /* BKL held */
540 .removexattr = smfs_removexattr, /* BKL held */