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;
72 SMFS_PRE_COW(filp->f_dentry->d_inode, filp->f_dentry, &count, &tmp_ppos,
73 REINT_WRITE, "write", rc, exit);
75 if (ppos != &(filp->f_pos)) {
76 cache_ppos = &tmp_ppos;
78 cache_ppos = &sfi->c_file->f_pos;
82 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
84 if (cache_inode->i_fop->write) {
85 rc = cache_inode->i_fop->write(sfi->c_file, buf,
89 SMFS_KML_POST(filp->f_dentry->d_inode, filp->f_dentry,
90 ppos, &count, REINT_WRITE, "write", 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);
112 if (sfi->magic != SMFS_FILE_MAGIC)
115 pre_smfs_inode(inode, cache_inode);
117 if (cache_inode->i_fop->ioctl) {
118 rc = cache_inode->i_fop->ioctl(cache_inode,
119 sfi->c_file, cmd, arg);
122 post_smfs_inode(inode, cache_inode);
123 duplicate_file(filp, sfi->c_file);
128 static ssize_t smfs_read(struct file *filp, char *buf,
129 size_t count, loff_t *ppos)
131 struct inode *cache_inode;
132 struct smfs_file_info *sfi;
139 cache_inode = I2CI(filp->f_dentry->d_inode);
144 if (sfi->magic != SMFS_FILE_MAGIC)
147 if (ppos != &(filp->f_pos)) {
148 cache_ppos = &tmp_ppos;
150 cache_ppos = &sfi->c_file->f_pos;
154 pre_smfs_inode(filp->f_dentry->d_inode, cache_inode);
156 if (cache_inode->i_fop->read) {
157 rc = cache_inode->i_fop->read(sfi->c_file, buf,
162 post_smfs_inode(filp->f_dentry->d_inode, cache_inode);
163 duplicate_file(filp, sfi->c_file);
168 static loff_t smfs_llseek(struct file *file,
172 struct inode *cache_inode;
173 struct smfs_file_info *sfi;
178 cache_inode = I2CI(file->f_dentry->d_inode);
183 if (sfi->magic != SMFS_FILE_MAGIC)
186 pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
188 if (cache_inode->i_fop->llseek) {
189 rc = cache_inode->i_fop->llseek(sfi->c_file,
193 post_smfs_inode(file->f_dentry->d_inode, cache_inode);
194 duplicate_file(file, sfi->c_file);
199 static int smfs_mmap(struct file *file, struct vm_area_struct *vma)
201 struct inode *inode = file->f_dentry->d_inode;
202 struct smfs_file_info *sfi;
203 struct inode *cache_inode = NULL;
207 cache_inode = I2CI(inode);
212 if (sfi->magic != SMFS_FILE_MAGIC)
215 if (cache_inode->i_mapping == &cache_inode->i_data)
216 inode->i_mapping = cache_inode->i_mapping;
218 pre_smfs_inode(inode, cache_inode);
219 if (cache_inode->i_fop->mmap)
220 rc = cache_inode->i_fop->mmap(sfi->c_file, vma);
222 post_smfs_inode(inode, cache_inode);
223 duplicate_file(file, sfi->c_file);
228 static int smfs_init_cache_file(struct inode *inode, struct file *filp)
230 struct smfs_file_info *sfi = NULL;
231 struct file *cache_filp = NULL;
232 struct dentry *cache_dentry = NULL;
236 OBD_ALLOC(sfi, sizeof(struct smfs_file_info));
240 cache_filp = get_empty_filp();
242 GOTO(err_exit, rc = -ENOMEM);
244 sfi->magic = SMFS_FILE_MAGIC;
246 cache_dentry = pre_smfs_dentry(NULL, I2CI(inode), filp->f_dentry);
248 GOTO(err_exit, rc = -ENOMEM);
250 cache_filp->f_vfsmnt = filp->f_vfsmnt;
252 cache_filp->f_dentry = cache_dentry;
253 duplicate_file(cache_filp, filp);
255 sfi->c_file = cache_filp;
257 if (filp->private_data != NULL)
260 filp->private_data = sfi;
265 OBD_FREE(sfi, sizeof(struct smfs_file_info));
267 put_filp(cache_filp);
271 static int smfs_cleanup_cache_file(struct file *filp)
273 struct smfs_file_info *sfi = NULL;
281 post_smfs_dentry(sfi->c_file->f_dentry);
283 put_filp(sfi->c_file);
285 OBD_FREE(sfi, sizeof(struct smfs_file_info));
287 filp->private_data = NULL;
292 int smfs_open(struct inode *inode, struct file *filp)
294 struct inode *cache_inode = NULL;
298 cache_inode = I2CI(inode);
302 if ((rc = smfs_init_cache_file(inode, filp)))
305 pre_smfs_inode(inode, cache_inode);
306 if (cache_inode->i_fop->open)
307 rc = cache_inode->i_fop->open(cache_inode, F2CF(filp));
309 post_smfs_inode(inode, cache_inode);
310 duplicate_file(filp, F2CF(filp));
314 int smfs_release(struct inode *inode, struct file *filp)
316 struct inode *cache_inode = NULL;
317 struct file *cache_file = NULL;
318 struct smfs_file_info *sfi = NULL;
322 cache_inode = I2CI(inode);
327 if (sfi->magic != SMFS_FILE_MAGIC)
329 cache_file = sfi->c_file;
331 pre_smfs_inode(inode, cache_inode);
332 if (cache_inode->i_fop->release)
333 rc = cache_inode->i_fop->release(cache_inode, cache_file);
335 post_smfs_inode(inode, cache_inode);
336 duplicate_file(filp, cache_file);
338 smfs_cleanup_cache_file(filp);
342 int smfs_fsync(struct file *file, struct dentry *dentry, int datasync)
344 struct smfs_file_info *sfi = NULL;
345 struct dentry *cache_dentry = NULL;
346 struct file *cache_file = NULL;
347 struct inode *cache_inode;
350 cache_inode = I2CI(dentry->d_inode);
354 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
360 if (sfi->magic != SMFS_FILE_MAGIC)
362 cache_file = sfi->c_file;
365 pre_smfs_inode(dentry->d_inode, cache_inode);
367 if (cache_inode->i_fop->fsync) {
368 rc = cache_inode->i_fop->fsync(cache_file,
369 cache_dentry, datasync);
372 post_smfs_inode(dentry->d_inode, cache_inode);
373 duplicate_file(file, cache_file);
374 post_smfs_dentry(cache_dentry);
379 struct file_operations smfs_file_fops = {
386 release: smfs_release,
390 static void smfs_truncate(struct inode *inode)
392 struct inode *cache_inode;
394 cache_inode = I2CI(inode);
402 pre_smfs_inode(inode, cache_inode);
403 if (cache_inode->i_op->truncate)
404 cache_inode->i_op->truncate(cache_inode);
406 post_smfs_inode(inode, cache_inode);
411 int smfs_setattr(struct dentry *dentry, struct iattr *attr)
413 struct inode *cache_inode;
414 struct dentry *cache_dentry;
418 cache_inode = I2CI(dentry->d_inode);
422 cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
426 handle = smfs_trans_start(dentry->d_inode, FSFILT_OP_SETATTR, NULL);
427 if (IS_ERR(handle) ) {
428 CERROR("smfs_do_mkdir: no space for transaction\n");
432 pre_smfs_inode(dentry->d_inode, cache_inode);
434 if (cache_inode->i_op->setattr)
435 rc = cache_inode->i_op->setattr(cache_dentry, attr);
437 SMFS_KML_POST(dentry->d_inode, dentry, attr, NULL,
438 REINT_SETATTR, "setattr", 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 */