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/highuid.h>
13 #include <linux/namei.h>
14 #include <linux/security.h>
15 #include <linux/syscalls.h>
16 #include <linux/pagemap.h>
18 #include <asm/uaccess.h>
19 #include <asm/unistd.h>
21 void generic_fillattr(struct inode *inode, struct kstat *stat)
23 stat->dev = inode->i_sb->s_dev;
24 stat->ino = inode->i_ino;
25 stat->mode = inode->i_mode;
26 stat->nlink = inode->i_nlink;
27 stat->uid = inode->i_uid;
28 stat->gid = inode->i_gid;
29 stat->rdev = inode->i_rdev;
30 stat->atime = inode->i_atime;
31 stat->mtime = inode->i_mtime;
32 stat->ctime = inode->i_ctime;
33 stat->size = i_size_read(inode);
34 stat->blocks = inode->i_blocks;
35 stat->blksize = (1 << inode->i_blkbits);
38 EXPORT_SYMBOL(generic_fillattr);
40 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
42 struct inode *inode = dentry->d_inode;
45 retval = security_inode_getattr(mnt, dentry);
49 if (inode->i_op->getattr)
50 return inode->i_op->getattr(mnt, dentry, stat);
52 generic_fillattr(inode, stat);
56 EXPORT_SYMBOL(vfs_getattr);
58 int vfs_fstat(unsigned int fd, struct kstat *stat)
60 struct file *f = fget_raw(fd);
64 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
69 EXPORT_SYMBOL(vfs_fstat);
71 int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
78 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
82 if (!(flag & AT_SYMLINK_NOFOLLOW))
83 lookup_flags |= LOOKUP_FOLLOW;
84 if (flag & AT_NO_AUTOMOUNT)
85 lookup_flags |= LOOKUP_NO_AUTOMOUNT;
86 if (flag & AT_EMPTY_PATH)
87 lookup_flags |= LOOKUP_EMPTY;
89 error = user_path_at(dfd, filename, lookup_flags, &path);
93 error = vfs_getattr(path.mnt, path.dentry, stat);
98 EXPORT_SYMBOL(vfs_fstatat);
100 int vfs_stat(const char __user *name, struct kstat *stat)
102 return vfs_fstatat(AT_FDCWD, name, stat, 0);
104 EXPORT_SYMBOL(vfs_stat);
106 int vfs_lstat(const char __user *name, struct kstat *stat)
108 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
110 EXPORT_SYMBOL(vfs_lstat);
113 #ifdef __ARCH_WANT_OLD_STAT
116 * For backward compatibility? Maybe this should be moved
117 * into arch/i386 instead?
119 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
121 static int warncount = 5;
122 struct __old_kernel_stat tmp;
126 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
128 } else if (warncount < 0) {
129 /* it's laughable, but... */
133 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
134 tmp.st_dev = old_encode_dev(stat->dev);
135 tmp.st_ino = stat->ino;
136 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
138 tmp.st_mode = stat->mode;
139 tmp.st_nlink = stat->nlink;
140 if (tmp.st_nlink != stat->nlink)
142 SET_UID(tmp.st_uid, stat->uid);
143 SET_GID(tmp.st_gid, stat->gid);
144 tmp.st_rdev = old_encode_dev(stat->rdev);
145 #if BITS_PER_LONG == 32
146 if (stat->size > MAX_NON_LFS)
149 tmp.st_size = stat->size;
150 tmp.st_atime = stat->atime.tv_sec;
151 tmp.st_mtime = stat->mtime.tv_sec;
152 tmp.st_ctime = stat->ctime.tv_sec;
153 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
156 SYSCALL_DEFINE2(stat, const char __user *, filename,
157 struct __old_kernel_stat __user *, statbuf)
162 error = vfs_stat(filename, &stat);
166 return cp_old_stat(&stat, statbuf);
169 SYSCALL_DEFINE2(lstat, const char __user *, filename,
170 struct __old_kernel_stat __user *, statbuf)
175 error = vfs_lstat(filename, &stat);
179 return cp_old_stat(&stat, statbuf);
182 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
185 int error = vfs_fstat(fd, &stat);
188 error = cp_old_stat(&stat, statbuf);
193 #endif /* __ARCH_WANT_OLD_STAT */
195 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
199 #if BITS_PER_LONG == 32
200 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
203 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
207 memset(&tmp, 0, sizeof(tmp));
208 #if BITS_PER_LONG == 32
209 tmp.st_dev = old_encode_dev(stat->dev);
211 tmp.st_dev = new_encode_dev(stat->dev);
213 tmp.st_ino = stat->ino;
214 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
216 tmp.st_mode = stat->mode;
217 tmp.st_nlink = stat->nlink;
218 if (tmp.st_nlink != stat->nlink)
220 SET_UID(tmp.st_uid, stat->uid);
221 SET_GID(tmp.st_gid, stat->gid);
222 #if BITS_PER_LONG == 32
223 tmp.st_rdev = old_encode_dev(stat->rdev);
225 tmp.st_rdev = new_encode_dev(stat->rdev);
227 #if BITS_PER_LONG == 32
228 if (stat->size > MAX_NON_LFS)
231 tmp.st_size = stat->size;
232 tmp.st_atime = stat->atime.tv_sec;
233 tmp.st_mtime = stat->mtime.tv_sec;
234 tmp.st_ctime = stat->ctime.tv_sec;
235 #ifdef STAT_HAVE_NSEC
236 tmp.st_atime_nsec = stat->atime.tv_nsec;
237 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
238 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
240 tmp.st_blocks = stat->blocks;
241 tmp.st_blksize = stat->blksize;
242 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
245 SYSCALL_DEFINE2(newstat, const char __user *, filename,
246 struct stat __user *, statbuf)
249 int error = vfs_stat(filename, &stat);
253 return cp_new_stat(&stat, statbuf);
256 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
257 struct stat __user *, statbuf)
262 error = vfs_lstat(filename, &stat);
266 return cp_new_stat(&stat, statbuf);
269 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
270 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
271 struct stat __user *, statbuf, int, flag)
276 error = vfs_fstatat(dfd, filename, &stat, flag);
279 return cp_new_stat(&stat, statbuf);
283 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
286 int error = vfs_fstat(fd, &stat);
289 error = cp_new_stat(&stat, statbuf);
294 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
295 char __user *, buf, int, bufsiz)
304 error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &path, &empty);
306 struct inode *inode = path.dentry->d_inode;
308 error = empty ? -ENOENT : -EINVAL;
309 if (inode->i_op->readlink) {
310 error = security_inode_readlink(path.dentry);
312 touch_atime(path.mnt, path.dentry);
313 error = inode->i_op->readlink(path.dentry,
322 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
325 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
329 /* ---------- LFS-64 ----------- */
330 #ifdef __ARCH_WANT_STAT64
332 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
336 memset(&tmp, 0, sizeof(struct stat64));
338 /* mips has weird padding, so we don't get 64 bits there */
339 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
341 tmp.st_dev = new_encode_dev(stat->dev);
342 tmp.st_rdev = new_encode_dev(stat->rdev);
344 tmp.st_dev = huge_encode_dev(stat->dev);
345 tmp.st_rdev = huge_encode_dev(stat->rdev);
347 tmp.st_ino = stat->ino;
348 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
350 #ifdef STAT64_HAS_BROKEN_ST_INO
351 tmp.__st_ino = stat->ino;
353 tmp.st_mode = stat->mode;
354 tmp.st_nlink = stat->nlink;
355 tmp.st_uid = stat->uid;
356 tmp.st_gid = stat->gid;
357 tmp.st_atime = stat->atime.tv_sec;
358 tmp.st_atime_nsec = stat->atime.tv_nsec;
359 tmp.st_mtime = stat->mtime.tv_sec;
360 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
361 tmp.st_ctime = stat->ctime.tv_sec;
362 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
363 tmp.st_size = stat->size;
364 tmp.st_blocks = stat->blocks;
365 tmp.st_blksize = stat->blksize;
366 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
369 SYSCALL_DEFINE2(stat64, const char __user *, filename,
370 struct stat64 __user *, statbuf)
373 int error = vfs_stat(filename, &stat);
376 error = cp_new_stat64(&stat, statbuf);
381 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
382 struct stat64 __user *, statbuf)
385 int error = vfs_lstat(filename, &stat);
388 error = cp_new_stat64(&stat, statbuf);
393 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
396 int error = vfs_fstat(fd, &stat);
399 error = cp_new_stat64(&stat, statbuf);
404 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
405 struct stat64 __user *, statbuf, int, flag)
410 error = vfs_fstatat(dfd, filename, &stat, flag);
413 return cp_new_stat64(&stat, statbuf);
415 #endif /* __ARCH_WANT_STAT64 */
417 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
418 void __inode_add_bytes(struct inode *inode, loff_t bytes)
420 inode->i_blocks += bytes >> 9;
422 inode->i_bytes += bytes;
423 if (inode->i_bytes >= 512) {
425 inode->i_bytes -= 512;
429 void inode_add_bytes(struct inode *inode, loff_t bytes)
431 spin_lock(&inode->i_lock);
432 __inode_add_bytes(inode, bytes);
433 spin_unlock(&inode->i_lock);
436 EXPORT_SYMBOL(inode_add_bytes);
438 void inode_sub_bytes(struct inode *inode, loff_t bytes)
440 spin_lock(&inode->i_lock);
441 inode->i_blocks -= bytes >> 9;
443 if (inode->i_bytes < bytes) {
445 inode->i_bytes += 512;
447 inode->i_bytes -= bytes;
448 spin_unlock(&inode->i_lock);
451 EXPORT_SYMBOL(inode_sub_bytes);
453 loff_t inode_get_bytes(struct inode *inode)
457 spin_lock(&inode->i_lock);
458 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
459 spin_unlock(&inode->i_lock);
463 EXPORT_SYMBOL(inode_get_bytes);
465 void inode_set_bytes(struct inode *inode, loff_t bytes)
467 /* Caller is here responsible for sufficient locking
468 * (ie. inode->i_lock) */
469 inode->i_blocks = bytes >> 9;
470 inode->i_bytes = bytes & 511;
473 EXPORT_SYMBOL(inode_set_bytes);