4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/module.h>
9 #include <linux/errno.h>
10 #include <linux/file.h>
11 #include <linux/smp_lock.h>
12 #include <linux/highuid.h>
14 #include <linux/namei.h>
15 #include <linux/security.h>
16 #include <linux/syscalls.h>
17 #include <linux/pagemap.h>
19 #include <asm/uaccess.h>
20 #include <asm/unistd.h>
22 void generic_fillattr(struct inode *inode, struct kstat *stat)
24 stat->dev = inode->i_sb->s_dev;
25 stat->ino = inode->i_ino;
26 stat->mode = inode->i_mode;
27 stat->nlink = inode->i_nlink;
28 stat->uid = inode->i_uid;
29 stat->gid = inode->i_gid;
30 stat->xid = inode->i_xid;
31 stat->rdev = inode->i_rdev;
32 stat->atime = inode->i_atime;
33 stat->mtime = inode->i_mtime;
34 stat->ctime = inode->i_ctime;
35 stat->size = i_size_read(inode);
36 stat->blocks = inode->i_blocks;
37 stat->blksize = PAGE_CACHE_SIZE;
40 EXPORT_SYMBOL(generic_fillattr);
42 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
44 struct inode *inode = dentry->d_inode;
47 retval = security_inode_getattr(mnt, dentry);
51 if (inode->i_op->getattr)
52 return inode->i_op->getattr(mnt, dentry, stat);
54 generic_fillattr(inode, stat);
56 struct super_block *s = inode->i_sb;
58 blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
59 stat->blocks = (s->s_blocksize / 512) * blocks;
60 stat->blksize = s->s_blocksize;
65 EXPORT_SYMBOL(vfs_getattr);
67 int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
72 error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
74 error = vfs_getattr(nd.mnt, nd.dentry, stat);
80 int vfs_stat(char __user *name, struct kstat *stat)
82 return vfs_stat_fd(AT_FDCWD, name, stat);
85 EXPORT_SYMBOL(vfs_stat);
87 int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
92 error = __user_walk_fd(dfd, name, 0, &nd);
94 error = vfs_getattr(nd.mnt, nd.dentry, stat);
100 int vfs_lstat(char __user *name, struct kstat *stat)
102 return vfs_lstat_fd(AT_FDCWD, name, stat);
105 EXPORT_SYMBOL(vfs_lstat);
107 int vfs_fstat(unsigned int fd, struct kstat *stat)
109 struct file *f = fget(fd);
113 error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
119 EXPORT_SYMBOL(vfs_fstat);
121 #ifdef __ARCH_WANT_OLD_STAT
124 * For backward compatibility? Maybe this should be moved
125 * into arch/i386 instead?
127 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
129 static int warncount = 5;
130 struct __old_kernel_stat tmp;
134 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
136 } else if (warncount < 0) {
137 /* it's laughable, but... */
141 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
142 tmp.st_dev = old_encode_dev(stat->dev);
143 tmp.st_ino = stat->ino;
144 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
146 tmp.st_mode = stat->mode;
147 tmp.st_nlink = stat->nlink;
148 if (tmp.st_nlink != stat->nlink)
150 SET_UID(tmp.st_uid, stat->uid);
151 SET_GID(tmp.st_gid, stat->gid);
152 tmp.st_rdev = old_encode_dev(stat->rdev);
153 #if BITS_PER_LONG == 32
154 if (stat->size > MAX_NON_LFS)
157 tmp.st_size = stat->size;
158 tmp.st_atime = stat->atime.tv_sec;
159 tmp.st_mtime = stat->mtime.tv_sec;
160 tmp.st_ctime = stat->ctime.tv_sec;
161 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
164 asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
167 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
170 error = cp_old_stat(&stat, statbuf);
174 asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
177 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
180 error = cp_old_stat(&stat, statbuf);
184 asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
187 int error = vfs_fstat(fd, &stat);
190 error = cp_old_stat(&stat, statbuf);
195 #endif /* __ARCH_WANT_OLD_STAT */
197 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
201 #if BITS_PER_LONG == 32
202 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
205 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
209 memset(&tmp, 0, sizeof(tmp));
210 #if BITS_PER_LONG == 32
211 tmp.st_dev = old_encode_dev(stat->dev);
213 tmp.st_dev = new_encode_dev(stat->dev);
215 tmp.st_ino = stat->ino;
216 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
218 tmp.st_mode = stat->mode;
219 tmp.st_nlink = stat->nlink;
220 if (tmp.st_nlink != stat->nlink)
222 SET_UID(tmp.st_uid, stat->uid);
223 SET_GID(tmp.st_gid, stat->gid);
224 #if BITS_PER_LONG == 32
225 tmp.st_rdev = old_encode_dev(stat->rdev);
227 tmp.st_rdev = new_encode_dev(stat->rdev);
229 #if BITS_PER_LONG == 32
230 if (stat->size > MAX_NON_LFS)
233 tmp.st_size = stat->size;
234 tmp.st_atime = stat->atime.tv_sec;
235 tmp.st_mtime = stat->mtime.tv_sec;
236 tmp.st_ctime = stat->ctime.tv_sec;
237 #ifdef STAT_HAVE_NSEC
238 tmp.st_atime_nsec = stat->atime.tv_nsec;
239 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
240 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
242 tmp.st_blocks = stat->blocks;
243 tmp.st_blksize = stat->blksize;
244 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
247 asmlinkage long sys_newstat(char __user *filename, struct stat __user *statbuf)
250 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
253 error = cp_new_stat(&stat, statbuf);
258 asmlinkage long sys_newlstat(char __user *filename, struct stat __user *statbuf)
261 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
264 error = cp_new_stat(&stat, statbuf);
269 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
270 asmlinkage long sys_newfstatat(int dfd, char __user *filename,
271 struct stat __user *statbuf, int flag)
276 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
279 if (flag & AT_SYMLINK_NOFOLLOW)
280 error = vfs_lstat_fd(dfd, filename, &stat);
282 error = vfs_stat_fd(dfd, filename, &stat);
285 error = cp_new_stat(&stat, statbuf);
292 asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
295 int error = vfs_fstat(fd, &stat);
298 error = cp_new_stat(&stat, statbuf);
303 asmlinkage long sys_readlinkat(int dfd, const char __user *path,
304 char __user *buf, int bufsiz)
312 error = __user_walk_fd(dfd, path, 0, &nd);
314 struct inode * inode = nd.dentry->d_inode;
317 if (inode->i_op && inode->i_op->readlink) {
318 error = security_inode_readlink(nd.dentry);
320 touch_atime(nd.mnt, nd.dentry);
321 error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
329 asmlinkage long sys_readlink(const char __user *path, char __user *buf,
332 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
336 /* ---------- LFS-64 ----------- */
337 #ifdef __ARCH_WANT_STAT64
339 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
343 memset(&tmp, 0, sizeof(struct stat64));
345 /* mips has weird padding, so we don't get 64 bits there */
346 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
348 tmp.st_dev = new_encode_dev(stat->dev);
349 tmp.st_rdev = new_encode_dev(stat->rdev);
351 tmp.st_dev = huge_encode_dev(stat->dev);
352 tmp.st_rdev = huge_encode_dev(stat->rdev);
354 tmp.st_ino = stat->ino;
355 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
357 #ifdef STAT64_HAS_BROKEN_ST_INO
358 tmp.__st_ino = stat->ino;
360 tmp.st_mode = stat->mode;
361 tmp.st_nlink = stat->nlink;
362 tmp.st_uid = stat->uid;
363 tmp.st_gid = stat->gid;
364 tmp.st_atime = stat->atime.tv_sec;
365 tmp.st_atime_nsec = stat->atime.tv_nsec;
366 tmp.st_mtime = stat->mtime.tv_sec;
367 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
368 tmp.st_ctime = stat->ctime.tv_sec;
369 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
370 tmp.st_size = stat->size;
371 tmp.st_blocks = stat->blocks;
372 tmp.st_blksize = stat->blksize;
373 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
376 asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
379 int error = vfs_stat(filename, &stat);
382 error = cp_new_stat64(&stat, statbuf);
386 asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
389 int error = vfs_lstat(filename, &stat);
392 error = cp_new_stat64(&stat, statbuf);
396 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
399 int error = vfs_fstat(fd, &stat);
402 error = cp_new_stat64(&stat, statbuf);
407 asmlinkage long sys_fstatat64(int dfd, char __user *filename,
408 struct stat64 __user *statbuf, int flag)
413 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
416 if (flag & AT_SYMLINK_NOFOLLOW)
417 error = vfs_lstat_fd(dfd, filename, &stat);
419 error = vfs_stat_fd(dfd, filename, &stat);
422 error = cp_new_stat64(&stat, statbuf);
427 #endif /* __ARCH_WANT_STAT64 */
429 void inode_add_bytes(struct inode *inode, loff_t bytes)
431 spin_lock(&inode->i_lock);
432 inode->i_blocks += bytes >> 9;
434 inode->i_bytes += bytes;
435 if (inode->i_bytes >= 512) {
437 inode->i_bytes -= 512;
439 spin_unlock(&inode->i_lock);
442 EXPORT_SYMBOL(inode_add_bytes);
444 void inode_sub_bytes(struct inode *inode, loff_t bytes)
446 spin_lock(&inode->i_lock);
447 inode->i_blocks -= bytes >> 9;
449 if (inode->i_bytes < bytes) {
451 inode->i_bytes += 512;
453 inode->i_bytes -= bytes;
454 spin_unlock(&inode->i_lock);
457 EXPORT_SYMBOL(inode_sub_bytes);
459 loff_t inode_get_bytes(struct inode *inode)
463 spin_lock(&inode->i_lock);
464 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
465 spin_unlock(&inode->i_lock);
469 EXPORT_SYMBOL(inode_get_bytes);
471 void inode_set_bytes(struct inode *inode, loff_t bytes)
473 /* Caller is here responsible for sufficient locking
474 * (ie. inode->i_lock) */
475 inode->i_blocks = bytes >> 9;
476 inode->i_bytes = bytes & 511;
479 EXPORT_SYMBOL(inode_set_bytes);