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(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)) != 0)
81 if (!(flag & AT_SYMLINK_NOFOLLOW))
82 lookup_flags |= LOOKUP_FOLLOW;
83 if (flag & AT_NO_AUTOMOUNT)
84 lookup_flags |= LOOKUP_NO_AUTOMOUNT;
86 error = user_path_at(dfd, filename, lookup_flags, &path);
90 error = vfs_getattr(path.mnt, path.dentry, stat);
95 EXPORT_SYMBOL(vfs_fstatat);
97 int vfs_stat(const char __user *name, struct kstat *stat)
99 return vfs_fstatat(AT_FDCWD, name, stat, 0);
101 EXPORT_SYMBOL(vfs_stat);
103 int vfs_lstat(const char __user *name, struct kstat *stat)
105 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
107 EXPORT_SYMBOL(vfs_lstat);
110 #ifdef __ARCH_WANT_OLD_STAT
113 * For backward compatibility? Maybe this should be moved
114 * into arch/i386 instead?
116 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
118 static int warncount = 5;
119 struct __old_kernel_stat tmp;
123 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
125 } else if (warncount < 0) {
126 /* it's laughable, but... */
130 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
131 tmp.st_dev = old_encode_dev(stat->dev);
132 tmp.st_ino = stat->ino;
133 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
135 tmp.st_mode = stat->mode;
136 tmp.st_nlink = stat->nlink;
137 if (tmp.st_nlink != stat->nlink)
139 SET_UID(tmp.st_uid, stat->uid);
140 SET_GID(tmp.st_gid, stat->gid);
141 tmp.st_rdev = old_encode_dev(stat->rdev);
142 #if BITS_PER_LONG == 32
143 if (stat->size > MAX_NON_LFS)
146 tmp.st_size = stat->size;
147 tmp.st_atime = stat->atime.tv_sec;
148 tmp.st_mtime = stat->mtime.tv_sec;
149 tmp.st_ctime = stat->ctime.tv_sec;
150 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
153 SYSCALL_DEFINE2(stat, const char __user *, filename,
154 struct __old_kernel_stat __user *, statbuf)
159 error = vfs_stat(filename, &stat);
163 return cp_old_stat(&stat, statbuf);
166 SYSCALL_DEFINE2(lstat, const char __user *, filename,
167 struct __old_kernel_stat __user *, statbuf)
172 error = vfs_lstat(filename, &stat);
176 return cp_old_stat(&stat, statbuf);
179 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
182 int error = vfs_fstat(fd, &stat);
185 error = cp_old_stat(&stat, statbuf);
190 #endif /* __ARCH_WANT_OLD_STAT */
192 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
196 #if BITS_PER_LONG == 32
197 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
200 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
204 memset(&tmp, 0, sizeof(tmp));
205 #if BITS_PER_LONG == 32
206 tmp.st_dev = old_encode_dev(stat->dev);
208 tmp.st_dev = new_encode_dev(stat->dev);
210 tmp.st_ino = stat->ino;
211 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
213 tmp.st_mode = stat->mode;
214 tmp.st_nlink = stat->nlink;
215 if (tmp.st_nlink != stat->nlink)
217 SET_UID(tmp.st_uid, stat->uid);
218 SET_GID(tmp.st_gid, stat->gid);
219 #if BITS_PER_LONG == 32
220 tmp.st_rdev = old_encode_dev(stat->rdev);
222 tmp.st_rdev = new_encode_dev(stat->rdev);
224 #if BITS_PER_LONG == 32
225 if (stat->size > MAX_NON_LFS)
228 tmp.st_size = stat->size;
229 tmp.st_atime = stat->atime.tv_sec;
230 tmp.st_mtime = stat->mtime.tv_sec;
231 tmp.st_ctime = stat->ctime.tv_sec;
232 #ifdef STAT_HAVE_NSEC
233 tmp.st_atime_nsec = stat->atime.tv_nsec;
234 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
235 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
237 tmp.st_blocks = stat->blocks;
238 tmp.st_blksize = stat->blksize;
239 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
242 SYSCALL_DEFINE2(newstat, const char __user *, filename,
243 struct stat __user *, statbuf)
246 int error = vfs_stat(filename, &stat);
250 return cp_new_stat(&stat, statbuf);
253 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
254 struct stat __user *, statbuf)
259 error = vfs_lstat(filename, &stat);
263 return cp_new_stat(&stat, statbuf);
266 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
267 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
268 struct stat __user *, statbuf, int, flag)
273 error = vfs_fstatat(dfd, filename, &stat, flag);
276 return cp_new_stat(&stat, statbuf);
280 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
283 int error = vfs_fstat(fd, &stat);
286 error = cp_new_stat(&stat, statbuf);
291 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
292 char __user *, buf, int, bufsiz)
300 error = user_path_at(dfd, pathname, 0, &path);
302 struct inode *inode = path.dentry->d_inode;
305 if (inode->i_op->readlink) {
306 error = security_inode_readlink(path.dentry);
308 touch_atime(path.mnt, path.dentry);
309 error = inode->i_op->readlink(path.dentry,
318 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
321 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
325 /* ---------- LFS-64 ----------- */
326 #ifdef __ARCH_WANT_STAT64
328 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
332 memset(&tmp, 0, sizeof(struct stat64));
334 /* mips has weird padding, so we don't get 64 bits there */
335 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
337 tmp.st_dev = new_encode_dev(stat->dev);
338 tmp.st_rdev = new_encode_dev(stat->rdev);
340 tmp.st_dev = huge_encode_dev(stat->dev);
341 tmp.st_rdev = huge_encode_dev(stat->rdev);
343 tmp.st_ino = stat->ino;
344 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
346 #ifdef STAT64_HAS_BROKEN_ST_INO
347 tmp.__st_ino = stat->ino;
349 tmp.st_mode = stat->mode;
350 tmp.st_nlink = stat->nlink;
351 tmp.st_uid = stat->uid;
352 tmp.st_gid = stat->gid;
353 tmp.st_atime = stat->atime.tv_sec;
354 tmp.st_atime_nsec = stat->atime.tv_nsec;
355 tmp.st_mtime = stat->mtime.tv_sec;
356 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
357 tmp.st_ctime = stat->ctime.tv_sec;
358 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
359 tmp.st_size = stat->size;
360 tmp.st_blocks = stat->blocks;
361 tmp.st_blksize = stat->blksize;
362 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
365 SYSCALL_DEFINE2(stat64, const char __user *, filename,
366 struct stat64 __user *, statbuf)
369 int error = vfs_stat(filename, &stat);
372 error = cp_new_stat64(&stat, statbuf);
377 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
378 struct stat64 __user *, statbuf)
381 int error = vfs_lstat(filename, &stat);
384 error = cp_new_stat64(&stat, statbuf);
389 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
392 int error = vfs_fstat(fd, &stat);
395 error = cp_new_stat64(&stat, statbuf);
400 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
401 struct stat64 __user *, statbuf, int, flag)
406 error = vfs_fstatat(dfd, filename, &stat, flag);
409 return cp_new_stat64(&stat, statbuf);
411 #endif /* __ARCH_WANT_STAT64 */
413 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
414 void __inode_add_bytes(struct inode *inode, loff_t bytes)
416 inode->i_blocks += bytes >> 9;
418 inode->i_bytes += bytes;
419 if (inode->i_bytes >= 512) {
421 inode->i_bytes -= 512;
425 void inode_add_bytes(struct inode *inode, loff_t bytes)
427 spin_lock(&inode->i_lock);
428 __inode_add_bytes(inode, bytes);
429 spin_unlock(&inode->i_lock);
432 EXPORT_SYMBOL(inode_add_bytes);
434 void inode_sub_bytes(struct inode *inode, loff_t bytes)
436 spin_lock(&inode->i_lock);
437 inode->i_blocks -= bytes >> 9;
439 if (inode->i_bytes < bytes) {
441 inode->i_bytes += 512;
443 inode->i_bytes -= bytes;
444 spin_unlock(&inode->i_lock);
447 EXPORT_SYMBOL(inode_sub_bytes);
449 loff_t inode_get_bytes(struct inode *inode)
453 spin_lock(&inode->i_lock);
454 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
455 spin_unlock(&inode->i_lock);
459 EXPORT_SYMBOL(inode_get_bytes);
461 void inode_set_bytes(struct inode *inode, loff_t bytes)
463 /* Caller is here responsible for sufficient locking
464 * (ie. inode->i_lock) */
465 inode->i_blocks = bytes >> 9;
466 inode->i_bytes = bytes & 511;
469 EXPORT_SYMBOL(inode_set_bytes);