4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/config.h>
8 #include <linux/module.h>
10 #include <linux/errno.h>
11 #include <linux/file.h>
12 #include <linux/smp_lock.h>
13 #include <linux/highuid.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/syscalls.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 = inode->i_blksize;
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(char __user *name, struct kstat *stat)
72 error = user_path_walk(name, &nd);
74 error = vfs_getattr(nd.mnt, nd.dentry, stat);
80 EXPORT_SYMBOL(vfs_stat);
82 int vfs_lstat(char __user *name, struct kstat *stat)
87 error = user_path_walk_link(name, &nd);
89 error = vfs_getattr(nd.mnt, nd.dentry, stat);
95 EXPORT_SYMBOL(vfs_lstat);
97 int vfs_fstat(unsigned int fd, struct kstat *stat)
99 struct file *f = fget(fd);
103 error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
109 EXPORT_SYMBOL(vfs_fstat);
111 #ifdef __ARCH_WANT_OLD_STAT
114 * For backward compatibility? Maybe this should be moved
115 * into arch/i386 instead?
117 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
119 static int warncount = 5;
120 struct __old_kernel_stat tmp;
124 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
126 } else if (warncount < 0) {
127 /* it's laughable, but... */
131 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
132 tmp.st_dev = old_encode_dev(stat->dev);
133 tmp.st_ino = stat->ino;
134 tmp.st_mode = stat->mode;
135 tmp.st_nlink = stat->nlink;
136 if (tmp.st_nlink != stat->nlink)
138 SET_UID(tmp.st_uid, stat->uid);
139 SET_GID(tmp.st_gid, stat->gid);
140 tmp.st_rdev = old_encode_dev(stat->rdev);
141 #if BITS_PER_LONG == 32
142 if (stat->size > MAX_NON_LFS)
145 tmp.st_size = stat->size;
146 tmp.st_atime = stat->atime.tv_sec;
147 tmp.st_mtime = stat->mtime.tv_sec;
148 tmp.st_ctime = stat->ctime.tv_sec;
149 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
152 asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
155 int error = vfs_stat(filename, &stat);
158 error = cp_old_stat(&stat, statbuf);
162 asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
165 int error = vfs_lstat(filename, &stat);
168 error = cp_old_stat(&stat, statbuf);
172 asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
175 int error = vfs_fstat(fd, &stat);
178 error = cp_old_stat(&stat, statbuf);
183 #endif /* __ARCH_WANT_OLD_STAT */
185 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
189 #if BITS_PER_LONG == 32
190 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
193 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
197 memset(&tmp, 0, sizeof(tmp));
198 #if BITS_PER_LONG == 32
199 tmp.st_dev = old_encode_dev(stat->dev);
201 tmp.st_dev = new_encode_dev(stat->dev);
203 tmp.st_ino = stat->ino;
204 tmp.st_mode = stat->mode;
205 tmp.st_nlink = stat->nlink;
206 if (tmp.st_nlink != stat->nlink)
208 SET_UID(tmp.st_uid, stat->uid);
209 SET_GID(tmp.st_gid, stat->gid);
210 #if BITS_PER_LONG == 32
211 tmp.st_rdev = old_encode_dev(stat->rdev);
213 tmp.st_rdev = new_encode_dev(stat->rdev);
215 #if BITS_PER_LONG == 32
216 if (stat->size > MAX_NON_LFS)
219 tmp.st_size = stat->size;
220 tmp.st_atime = stat->atime.tv_sec;
221 tmp.st_mtime = stat->mtime.tv_sec;
222 tmp.st_ctime = stat->ctime.tv_sec;
223 #ifdef STAT_HAVE_NSEC
224 tmp.st_atime_nsec = stat->atime.tv_nsec;
225 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
226 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
228 tmp.st_blocks = stat->blocks;
229 tmp.st_blksize = stat->blksize;
230 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
233 asmlinkage long sys_newstat(char __user * filename, struct stat __user * statbuf)
236 int error = vfs_stat(filename, &stat);
239 error = cp_new_stat(&stat, statbuf);
243 asmlinkage long sys_newlstat(char __user * filename, struct stat __user * statbuf)
246 int error = vfs_lstat(filename, &stat);
249 error = cp_new_stat(&stat, statbuf);
253 asmlinkage long sys_newfstat(unsigned int fd, struct stat __user * statbuf)
256 int error = vfs_fstat(fd, &stat);
259 error = cp_new_stat(&stat, statbuf);
264 asmlinkage long sys_readlink(const char __user * path, char __user * buf, int bufsiz)
272 error = user_path_walk_link(path, &nd);
274 struct inode * inode = nd.dentry->d_inode;
277 if (inode->i_op && inode->i_op->readlink) {
278 error = security_inode_readlink(nd.dentry);
280 touch_atime(nd.mnt, nd.dentry);
281 error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
290 /* ---------- LFS-64 ----------- */
291 #ifdef __ARCH_WANT_STAT64
293 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
297 memset(&tmp, 0, sizeof(struct stat64));
299 /* mips has weird padding, so we don't get 64 bits there */
300 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
302 tmp.st_dev = new_encode_dev(stat->dev);
303 tmp.st_rdev = new_encode_dev(stat->rdev);
305 tmp.st_dev = huge_encode_dev(stat->dev);
306 tmp.st_rdev = huge_encode_dev(stat->rdev);
308 tmp.st_ino = stat->ino;
309 #ifdef STAT64_HAS_BROKEN_ST_INO
310 tmp.__st_ino = stat->ino;
312 tmp.st_mode = stat->mode;
313 tmp.st_nlink = stat->nlink;
314 tmp.st_uid = stat->uid;
315 tmp.st_gid = stat->gid;
316 tmp.st_atime = stat->atime.tv_sec;
317 tmp.st_atime_nsec = stat->atime.tv_nsec;
318 tmp.st_mtime = stat->mtime.tv_sec;
319 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
320 tmp.st_ctime = stat->ctime.tv_sec;
321 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
322 tmp.st_size = stat->size;
323 tmp.st_blocks = stat->blocks;
324 tmp.st_blksize = stat->blksize;
325 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
328 asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
331 int error = vfs_stat(filename, &stat);
334 error = cp_new_stat64(&stat, statbuf);
338 asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
341 int error = vfs_lstat(filename, &stat);
344 error = cp_new_stat64(&stat, statbuf);
348 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
351 int error = vfs_fstat(fd, &stat);
354 error = cp_new_stat64(&stat, statbuf);
359 #endif /* __ARCH_WANT_STAT64 */
361 void inode_add_bytes(struct inode *inode, loff_t bytes)
363 spin_lock(&inode->i_lock);
364 inode->i_blocks += bytes >> 9;
366 inode->i_bytes += bytes;
367 if (inode->i_bytes >= 512) {
369 inode->i_bytes -= 512;
371 spin_unlock(&inode->i_lock);
374 EXPORT_SYMBOL(inode_add_bytes);
376 void inode_sub_bytes(struct inode *inode, loff_t bytes)
378 spin_lock(&inode->i_lock);
379 inode->i_blocks -= bytes >> 9;
381 if (inode->i_bytes < bytes) {
383 inode->i_bytes += 512;
385 inode->i_bytes -= bytes;
386 spin_unlock(&inode->i_lock);
389 EXPORT_SYMBOL(inode_sub_bytes);
391 loff_t inode_get_bytes(struct inode *inode)
395 spin_lock(&inode->i_lock);
396 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
397 spin_unlock(&inode->i_lock);
401 EXPORT_SYMBOL(inode_get_bytes);
403 void inode_set_bytes(struct inode *inode, loff_t bytes)
405 /* Caller is here responsible for sufficient locking
406 * (ie. inode->i_lock) */
407 inode->i_blocks = bytes >> 9;
408 inode->i_bytes = bytes & 511;
411 EXPORT_SYMBOL(inode_set_bytes);