1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/lib/fsfilt_ext3.c
5 * Lustre filesystem abstraction routines
7 * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
8 * Author: Andreas Dilger <adilger@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 # define EXPORT_SYMTAB
30 #define DEBUG_SUBSYSTEM S_FILTER
32 #include <linux/version.h>
34 #include <asm/unistd.h>
35 #include <linux/jbd.h>
36 #include <linux/slab.h>
37 #include <linux/pagemap.h>
38 #include <linux/quotaops.h>
39 #include <linux/version.h>
40 #include <linux/kp30.h>
41 #include <linux/lustre_fsfilt.h>
42 #include <linux/obd.h>
43 #include <linux/obd_class.h>
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/lustre_compat25.h>
47 #include <linux/lvfs.h>
48 #include "lvfs_internal.h"
50 #include <linux/obd.h>
51 #include <linux/lustre_lib.h>
52 #include <linux/lustre_mds.h> /* for mds_grp_hash_entry */
58 /* Debugging check only needed during development */
60 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
61 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERT(!segment_eq(get_fs(), get_ds()))
62 # define ASSERT_KERNEL_CTXT(msg) LASSERT(segment_eq(get_fs(), get_ds()))
64 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
65 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
66 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
69 static void push_group_info(struct lvfs_run_ctxt *save,
70 struct group_info *ginfo)
73 save->ngroups = current_ngroups;
76 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
78 save->group_info = current->group_info;
79 current->group_info = group_info;
82 LASSERT(ginfo->ngroups <= NGROUPS);
84 save->group_info.ngroups = current->ngroups;
86 memcpy(save->group_info.small_block, current->groups,
89 current->ngroups = ginfo->ngroups;
91 memcpy(current->groups, ginfo->small_block,
97 static void pop_group_info(struct lvfs_run_ctxt *save,
98 struct group_info *ginfo)
101 current_ngroups = save->ngroups;
103 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
105 current->group_info = save->group_info;
106 task_unlock(current);
108 current->ngroups = ginfo->ngroups;
109 if (current->ngroups)
110 memcpy(current->groups, save->group_info.small_block,
116 /* push / pop to root of obd store */
117 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
118 struct lvfs_ucred *uc)
120 //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
121 ASSERT_CTXT_MAGIC(new_ctx->magic);
122 LASSERT(save->magic != OBD_RUN_CTXT_MAGIC || save->pid != current->pid);
123 OBD_SET_CTXT_MAGIC(save);
124 save->pid = current->pid;
128 "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
129 save, current, current->fs, current->fs->pwd,
130 atomic_read(¤t->fs->pwd->d_count),
131 atomic_read(¤t->fs->pwd->d_inode->i_count),
132 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
134 atomic_read(¤t->fs->pwdmnt->mnt_count));
138 LASSERT(atomic_read(¤t->fs->pwd->d_count));
139 LASSERT(atomic_read(&new_ctx->pwd->d_count));
140 save->pwd = dget(current->fs->pwd);
141 save->pwdmnt = mntget(current->fs->pwdmnt);
142 save->ngroups = current_ngroups;
145 LASSERT(save->pwdmnt);
146 LASSERT(new_ctx->pwd);
147 LASSERT(new_ctx->pwdmnt);
150 save->luc.luc_fsuid = current->fsuid;
151 save->luc.luc_fsgid = current->fsgid;
152 save->luc.luc_cap = current->cap_effective;
154 current->fsuid = uc->luc_fsuid;
155 current->fsgid = uc->luc_fsgid;
156 current->cap_effective = uc->luc_cap;
158 push_group_info(save, uc->luc_ginfo);
161 set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
165 "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
166 new_ctx, current, current->fs, current->fs->pwd,
167 atomic_read(¤t->fs->pwd->d_count),
168 atomic_read(¤t->fs->pwd->d_inode->i_count),
169 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
171 atomic_read(¤t->fs->pwdmnt->mnt_count));
174 EXPORT_SYMBOL(push_ctxt);
176 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
177 struct lvfs_ucred *uc)
180 ASSERT_CTXT_MAGIC(saved->magic);
181 LASSERT(saved->pid == current->pid);
185 ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
189 " = pop %p==%p = cur %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
190 new_ctx, current, current->fs, current->fs->pwd,
191 atomic_read(¤t->fs->pwd->d_count),
192 atomic_read(¤t->fs->pwd->d_inode->i_count),
193 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
195 atomic_read(¤t->fs->pwdmnt->mnt_count));
198 LASSERT(current->fs->pwd == new_ctx->pwd);
199 LASSERT(current->fs->pwdmnt == new_ctx->pwdmnt);
202 set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
205 mntput(saved->pwdmnt);
207 current->fsuid = saved->luc.luc_fsuid;
208 current->fsgid = saved->luc.luc_fsgid;
209 current->cap_effective = saved->luc.luc_cap;
211 pop_group_info(saved, uc->luc_ginfo);
216 "= pop %p->%p = cur fs %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
217 saved, current, current->fs, current->fs->pwd,
218 atomic_read(¤t->fs->pwd->d_count),
219 atomic_read(¤t->fs->pwd->d_inode->i_count),
220 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
222 atomic_read(¤t->fs->pwdmnt->mnt_count));
225 EXPORT_SYMBOL(pop_ctxt);
227 /* utility to make a file */
228 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
230 struct dentry *dchild;
234 ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
235 CDEBUG(D_INODE, "creating file %*s\n", (int)strlen(name), name);
237 dchild = ll_lookup_one_len(name, dir, strlen(name));
239 GOTO(out_up, dchild);
241 if (dchild->d_inode) {
242 int old_mode = dchild->d_inode->i_mode;
243 if (!S_ISREG(old_mode))
244 GOTO(out_err, err = -EEXIST);
246 /* Fixup file permissions if necessary */
247 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
248 CWARN("fixing permissions on %s from %o to %o\n",
249 name, old_mode, mode);
250 dchild->d_inode->i_mode = (mode & S_IALLUGO) |
251 (old_mode & ~S_IALLUGO);
252 mark_inode_dirty(dchild->d_inode);
254 GOTO(out_up, dchild);
257 err = ll_vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
266 dchild = ERR_PTR(err);
270 EXPORT_SYMBOL(simple_mknod);
272 /* utility to make a directory */
273 struct dentry *simple_mkdir(struct dentry *dir, char *name, int mode, int fix)
275 struct dentry *dchild;
279 ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
280 CDEBUG(D_INODE, "creating directory %*s\n", (int)strlen(name), name);
281 dchild = ll_lookup_one_len(name, dir, strlen(name));
283 GOTO(out_up, dchild);
285 if (dchild->d_inode) {
286 int old_mode = dchild->d_inode->i_mode;
287 if (!S_ISDIR(old_mode))
288 GOTO(out_err, err = -ENOTDIR);
290 /* Fixup directory permissions if necessary */
291 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
292 CWARN("fixing permissions on %s from %o to %o\n",
293 name, old_mode, mode);
294 dchild->d_inode->i_mode = (mode & S_IALLUGO) |
295 (old_mode & ~S_IALLUGO);
296 mark_inode_dirty(dchild->d_inode);
298 GOTO(out_up, dchild);
301 err = vfs_mkdir(dir->d_inode, dchild, mode);
309 dchild = ERR_PTR(err);
313 EXPORT_SYMBOL(simple_mkdir);
316 * Read a file from within kernel context. Prior to calling this
317 * function we should already have done a push_ctxt().
319 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
321 ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
322 if (!file || !file->f_op || !file->f_op->read || !off)
325 return file->f_op->read(file, buf, len, off);
327 EXPORT_SYMBOL(lustre_fread);
330 * Write a file from within kernel context. Prior to calling this
331 * function we should already have done a push_ctxt().
333 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
336 ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
344 if (!file->f_op->write)
347 RETURN(file->f_op->write(file, buf, len, off));
349 EXPORT_SYMBOL(lustre_fwrite);
352 * Sync a file from within kernel context. Prior to calling this
353 * function we should already have done a push_ctxt().
355 int lustre_fsync(struct file *file)
358 ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
359 if (!file || !file->f_op || !file->f_op->fsync)
362 RETURN(file->f_op->fsync(file, file->f_dentry, 0));
364 EXPORT_SYMBOL(lustre_fsync);
366 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
369 mntget(ctxt->pwdmnt);
370 return dentry_open(de, ctxt->pwdmnt, flags);
372 EXPORT_SYMBOL(l_dentry_open);
374 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
375 ino_t ino, unsigned int d_type)
377 struct l_linux_dirent *dirent;
378 struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
380 dirent = buf->lrc_dirent;
382 dirent->lld_off = offset;
384 OBD_ALLOC(dirent, sizeof(*dirent));
386 list_add_tail(&dirent->lld_list, buf->lrc_list);
388 buf->lrc_dirent = dirent;
389 dirent->lld_ino = ino;
390 LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
391 memcpy(dirent->lld_name, name, namlen);
396 long l_readdir(struct file *file, struct list_head *dentry_list)
398 struct l_linux_dirent *lastdirent;
399 struct l_readdir_callback buf;
402 buf.lrc_dirent = NULL;
403 buf.lrc_list = dentry_list;
405 error = vfs_readdir(file, l_filldir, &buf);
409 lastdirent = buf.lrc_dirent;
411 lastdirent->lld_off = file->f_pos;
415 EXPORT_SYMBOL(l_readdir);
416 EXPORT_SYMBOL(obd_memory);
417 EXPORT_SYMBOL(obd_memmax);
419 static int __init lvfs_linux_init(void)
424 static void __exit lvfs_linux_exit(void)
429 leaked = atomic_read(&obd_memory);
430 CDEBUG(leaked ? D_ERROR : D_INFO,
431 "obd mem max: %d leaked: %d\n", obd_memmax, leaked);
436 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
437 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
438 MODULE_LICENSE("GPL");
440 module_init(lvfs_linux_init);
441 module_exit(lvfs_linux_exit);