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>
57 /* Debugging check only needed during development */
59 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
60 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERT(!segment_eq(get_fs(), get_ds()))
61 # define ASSERT_KERNEL_CTXT(msg) LASSERT(segment_eq(get_fs(), get_ds()))
63 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
64 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
65 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
68 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
69 #define current_ngroups current->group_info->ngroups
70 #define current_groups current->group_info->small_block
72 #define current_ngroups current->ngroups
73 #define current_groups current->groups
76 /* push / pop to root of obd store */
77 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
78 struct lvfs_ucred *uc)
80 //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
81 ASSERT_CTXT_MAGIC(new_ctx->magic);
82 LASSERT(save->magic != OBD_RUN_CTXT_MAGIC || save->pid != current->pid);
83 OBD_SET_CTXT_MAGIC(save);
84 save->pid = current->pid;
88 "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
89 save, current, current->fs, current->fs->pwd,
90 atomic_read(¤t->fs->pwd->d_count),
91 atomic_read(¤t->fs->pwd->d_inode->i_count),
92 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
94 atomic_read(¤t->fs->pwdmnt->mnt_count));
98 LASSERT(atomic_read(¤t->fs->pwd->d_count));
99 LASSERT(atomic_read(&new_ctx->pwd->d_count));
100 save->pwd = dget(current->fs->pwd);
101 save->pwdmnt = mntget(current->fs->pwdmnt);
102 save->ngroups = current_ngroups;
105 LASSERT(save->pwdmnt);
106 LASSERT(new_ctx->pwd);
107 LASSERT(new_ctx->pwdmnt);
110 save->luc.luc_fsuid = current->fsuid;
111 save->luc.luc_fsgid = current->fsgid;
112 save->luc.luc_cap = current->cap_effective;
113 save->luc.luc_suppgid1 = current_groups[0];
114 save->luc.luc_suppgid2 = current_groups[1];
116 current->fsuid = uc->luc_fsuid;
117 current->fsgid = uc->luc_fsgid;
118 current->cap_effective = uc->luc_cap;
121 if (uc->luc_suppgid1 != -1)
122 current_groups[current_ngroups++] = uc->luc_suppgid1;
123 if (uc->luc_suppgid2 != -1)
124 current_groups[current_ngroups++] = uc->luc_suppgid2;
127 set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
131 "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
132 new_ctx, current, current->fs, current->fs->pwd,
133 atomic_read(¤t->fs->pwd->d_count),
134 atomic_read(¤t->fs->pwd->d_inode->i_count),
135 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
137 atomic_read(¤t->fs->pwdmnt->mnt_count));
140 EXPORT_SYMBOL(push_ctxt);
142 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
143 struct lvfs_ucred *uc)
146 ASSERT_CTXT_MAGIC(saved->magic);
147 LASSERT(saved->pid == current->pid);
151 ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
155 " = pop %p==%p = cur %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
156 new_ctx, current, current->fs, current->fs->pwd,
157 atomic_read(¤t->fs->pwd->d_count),
158 atomic_read(¤t->fs->pwd->d_inode->i_count),
159 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
161 atomic_read(¤t->fs->pwdmnt->mnt_count));
164 LASSERT(current->fs->pwd == new_ctx->pwd);
165 LASSERT(current->fs->pwdmnt == new_ctx->pwdmnt);
168 set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
171 mntput(saved->pwdmnt);
173 current->fsuid = saved->luc.luc_fsuid;
174 current->fsgid = saved->luc.luc_fsgid;
175 current->cap_effective = saved->luc.luc_cap;
176 current_ngroups = saved->ngroups;
177 current_groups[0] = saved->luc.luc_suppgid1;
178 current_groups[1] = saved->luc.luc_suppgid2;
183 "= pop %p->%p = cur fs %p pwd %p:d%d:i%d (%*s), pwdmnt %p:%d\n",
184 saved, current, current->fs, current->fs->pwd,
185 atomic_read(¤t->fs->pwd->d_count),
186 atomic_read(¤t->fs->pwd->d_inode->i_count),
187 current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
189 atomic_read(¤t->fs->pwdmnt->mnt_count));
192 EXPORT_SYMBOL(pop_ctxt);
194 /* utility to make a file */
195 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
197 struct dentry *dchild;
201 ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
202 CDEBUG(D_INODE, "creating file %*s\n", (int)strlen(name), name);
204 dchild = ll_lookup_one_len(name, dir, strlen(name));
206 GOTO(out_up, dchild);
208 if (dchild->d_inode) {
209 int old_mode = dchild->d_inode->i_mode;
210 if (!S_ISREG(old_mode))
211 GOTO(out_err, err = -EEXIST);
213 /* Fixup file permissions if necessary */
214 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
215 CWARN("fixing permissions on %s from %o to %o\n",
216 name, old_mode, mode);
217 dchild->d_inode->i_mode = (mode & S_IALLUGO) |
218 (old_mode & ~S_IALLUGO);
219 mark_inode_dirty(dchild->d_inode);
221 GOTO(out_up, dchild);
224 err = ll_vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
233 dchild = ERR_PTR(err);
237 EXPORT_SYMBOL(simple_mknod);
239 /* utility to make a directory */
240 struct dentry *simple_mkdir(struct dentry *dir, char *name, int mode, int fix)
242 struct dentry *dchild;
246 ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
247 CDEBUG(D_INODE, "creating directory %*s\n", (int)strlen(name), name);
248 dchild = ll_lookup_one_len(name, dir, strlen(name));
250 GOTO(out_up, dchild);
252 if (dchild->d_inode) {
253 int old_mode = dchild->d_inode->i_mode;
254 if (!S_ISDIR(old_mode))
255 GOTO(out_err, err = -ENOTDIR);
257 /* Fixup directory permissions if necessary */
258 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
259 CWARN("fixing permissions on %s from %o to %o\n",
260 name, old_mode, mode);
261 dchild->d_inode->i_mode = (mode & S_IALLUGO) |
262 (old_mode & ~S_IALLUGO);
263 mark_inode_dirty(dchild->d_inode);
265 GOTO(out_up, dchild);
268 err = vfs_mkdir(dir->d_inode, dchild, mode);
276 dchild = ERR_PTR(err);
280 EXPORT_SYMBOL(simple_mkdir);
283 * Read a file from within kernel context. Prior to calling this
284 * function we should already have done a push_ctxt().
286 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
288 ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
289 if (!file || !file->f_op || !file->f_op->read || !off)
292 return file->f_op->read(file, buf, len, off);
294 EXPORT_SYMBOL(lustre_fread);
297 * Write a file from within kernel context. Prior to calling this
298 * function we should already have done a push_ctxt().
300 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
303 ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
311 if (!file->f_op->write)
314 RETURN(file->f_op->write(file, buf, len, off));
316 EXPORT_SYMBOL(lustre_fwrite);
319 * Sync a file from within kernel context. Prior to calling this
320 * function we should already have done a push_ctxt().
322 int lustre_fsync(struct file *file)
325 ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
326 if (!file || !file->f_op || !file->f_op->fsync)
329 RETURN(file->f_op->fsync(file, file->f_dentry, 0));
331 EXPORT_SYMBOL(lustre_fsync);
333 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
336 mntget(ctxt->pwdmnt);
337 return dentry_open(de, ctxt->pwdmnt, flags);
339 EXPORT_SYMBOL(l_dentry_open);
341 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
342 ino_t ino, unsigned int d_type)
344 struct l_linux_dirent *dirent;
345 struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
347 dirent = buf->lrc_dirent;
349 dirent->lld_off = offset;
351 OBD_ALLOC(dirent, sizeof(*dirent));
353 list_add_tail(&dirent->lld_list, buf->lrc_list);
355 buf->lrc_dirent = dirent;
356 dirent->lld_ino = ino;
357 LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
358 memcpy(dirent->lld_name, name, namlen);
363 long l_readdir(struct file *file, struct list_head *dentry_list)
365 struct l_linux_dirent *lastdirent;
366 struct l_readdir_callback buf;
369 buf.lrc_dirent = NULL;
370 buf.lrc_list = dentry_list;
372 error = vfs_readdir(file, l_filldir, &buf);
376 lastdirent = buf.lrc_dirent;
378 lastdirent->lld_off = file->f_pos;
382 EXPORT_SYMBOL(l_readdir);
383 EXPORT_SYMBOL(obd_memory);
384 EXPORT_SYMBOL(obd_memmax);
386 static int __init lvfs_linux_init(void)
391 static void __exit lvfs_linux_exit(void)
396 leaked = atomic_read(&obd_memory);
397 CDEBUG(leaked ? D_ERROR : D_INFO,
398 "obd mem max: %d leaked: %d\n", obd_memmax, leaked);
403 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
404 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
405 MODULE_LICENSE("GPL");
407 module_init(lvfs_linux_init);
408 module_exit(lvfs_linux_exit);