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>
18 #include <asm/uaccess.h>
20 void generic_fillattr(struct inode *inode, struct kstat *stat)
22 stat->dev = inode->i_sb->s_dev;
23 stat->ino = inode->i_ino;
24 stat->mode = inode->i_mode;
25 stat->nlink = inode->i_nlink;
26 stat->uid = inode->i_uid;
27 stat->gid = inode->i_gid;
28 stat->rdev = inode->i_rdev;
29 stat->atime = inode->i_atime;
30 stat->mtime = inode->i_mtime;
31 stat->ctime = inode->i_ctime;
32 stat->size = i_size_read(inode);
33 stat->blocks = inode->i_blocks;
34 stat->blksize = inode->i_blksize;
37 EXPORT_SYMBOL(generic_fillattr);
39 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
41 struct inode *inode = dentry->d_inode;
44 retval = security_inode_getattr(mnt, dentry);
48 if (inode->i_op->getattr)
49 return inode->i_op->getattr(mnt, dentry, stat);
51 generic_fillattr(inode, stat);
53 struct super_block *s = inode->i_sb;
55 blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
56 stat->blocks = (s->s_blocksize / 512) * blocks;
57 stat->blksize = s->s_blocksize;
62 EXPORT_SYMBOL(vfs_getattr);
64 int vfs_stat(char __user *name, struct kstat *stat)
69 error = user_path_walk(name, &nd);
71 error = vfs_getattr(nd.mnt, nd.dentry, stat);
77 EXPORT_SYMBOL(vfs_stat);
79 int vfs_lstat(char __user *name, struct kstat *stat)
84 error = user_path_walk_link(name, &nd);
86 error = vfs_getattr(nd.mnt, nd.dentry, stat);
92 EXPORT_SYMBOL(vfs_lstat);
94 int vfs_fstat(unsigned int fd, struct kstat *stat)
96 struct file *f = fget(fd);
100 error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
106 EXPORT_SYMBOL(vfs_fstat);
108 #if !defined(__alpha__) && !defined(__sparc__) && !defined(__ia64__) \
109 && !defined(CONFIG_ARCH_S390) && !defined(__hppa__) \
110 && !defined(__arm__) && !defined(CONFIG_V850) && !defined(__powerpc64__) \
111 && !defined(__mips__)
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 SET_UID(tmp.st_uid, stat->uid);
137 SET_GID(tmp.st_gid, stat->gid);
138 tmp.st_rdev = old_encode_dev(stat->rdev);
139 #if BITS_PER_LONG == 32
140 if (stat->size > MAX_NON_LFS)
143 tmp.st_size = stat->size;
144 tmp.st_atime = stat->atime.tv_sec;
145 tmp.st_mtime = stat->mtime.tv_sec;
146 tmp.st_ctime = stat->ctime.tv_sec;
147 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
150 asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
153 int error = vfs_stat(filename, &stat);
156 error = cp_old_stat(&stat, statbuf);
160 asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
163 int error = vfs_lstat(filename, &stat);
166 error = cp_old_stat(&stat, statbuf);
170 asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
173 int error = vfs_fstat(fd, &stat);
176 error = cp_old_stat(&stat, statbuf);
183 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
187 #if BITS_PER_LONG == 32
188 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
191 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
195 memset(&tmp, 0, sizeof(tmp));
196 #if BITS_PER_LONG == 32
197 tmp.st_dev = old_encode_dev(stat->dev);
199 tmp.st_dev = new_encode_dev(stat->dev);
201 tmp.st_ino = stat->ino;
202 tmp.st_mode = stat->mode;
203 tmp.st_nlink = stat->nlink;
204 SET_UID(tmp.st_uid, stat->uid);
205 SET_GID(tmp.st_gid, stat->gid);
206 #if BITS_PER_LONG == 32
207 tmp.st_rdev = old_encode_dev(stat->rdev);
209 tmp.st_rdev = new_encode_dev(stat->rdev);
211 #if BITS_PER_LONG == 32
212 if (stat->size > MAX_NON_LFS)
215 tmp.st_size = stat->size;
216 tmp.st_atime = stat->atime.tv_sec;
217 tmp.st_mtime = stat->mtime.tv_sec;
218 tmp.st_ctime = stat->ctime.tv_sec;
219 #ifdef STAT_HAVE_NSEC
220 tmp.st_atime_nsec = stat->atime.tv_nsec;
221 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
222 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
224 tmp.st_blocks = stat->blocks;
225 tmp.st_blksize = stat->blksize;
226 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
229 asmlinkage long sys_newstat(char __user * filename, struct stat __user * statbuf)
232 int error = vfs_stat(filename, &stat);
235 error = cp_new_stat(&stat, statbuf);
239 asmlinkage long sys_newlstat(char __user * filename, struct stat __user * statbuf)
242 int error = vfs_lstat(filename, &stat);
245 error = cp_new_stat(&stat, statbuf);
249 asmlinkage long sys_newfstat(unsigned int fd, struct stat __user * statbuf)
252 int error = vfs_fstat(fd, &stat);
255 error = cp_new_stat(&stat, statbuf);
260 asmlinkage long sys_readlink(const char __user * path, char __user * buf, int bufsiz)
268 error = user_path_walk_link(path, &nd);
270 struct inode * inode = nd.dentry->d_inode;
273 if (inode->i_op && inode->i_op->readlink) {
274 error = security_inode_readlink(nd.dentry);
276 touch_atime(nd.mnt, nd.dentry);
277 error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
286 /* ---------- LFS-64 ----------- */
287 #if !defined(__ia64__) && !defined(__mips64) && !defined(__x86_64__) && !defined(CONFIG_ARCH_S390X)
289 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
293 memset(&tmp, 0, sizeof(struct stat64));
295 /* mips has weird padding, so we don't get 64 bits there */
296 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
298 tmp.st_dev = new_encode_dev(stat->dev);
299 tmp.st_rdev = new_encode_dev(stat->rdev);
301 tmp.st_dev = huge_encode_dev(stat->dev);
302 tmp.st_rdev = huge_encode_dev(stat->rdev);
304 tmp.st_ino = stat->ino;
305 #ifdef STAT64_HAS_BROKEN_ST_INO
306 tmp.__st_ino = stat->ino;
308 tmp.st_mode = stat->mode;
309 tmp.st_nlink = stat->nlink;
310 tmp.st_uid = stat->uid;
311 tmp.st_gid = stat->gid;
312 tmp.st_atime = stat->atime.tv_sec;
313 tmp.st_atime_nsec = stat->atime.tv_nsec;
314 tmp.st_mtime = stat->mtime.tv_sec;
315 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
316 tmp.st_ctime = stat->ctime.tv_sec;
317 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
318 tmp.st_size = stat->size;
319 tmp.st_blocks = stat->blocks;
320 tmp.st_blksize = stat->blksize;
321 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
324 asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
327 int error = vfs_stat(filename, &stat);
330 error = cp_new_stat64(&stat, statbuf);
334 asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
337 int error = vfs_lstat(filename, &stat);
340 error = cp_new_stat64(&stat, statbuf);
344 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
347 int error = vfs_fstat(fd, &stat);
350 error = cp_new_stat64(&stat, statbuf);
357 void inode_add_bytes(struct inode *inode, loff_t bytes)
359 spin_lock(&inode->i_lock);
360 inode->i_blocks += bytes >> 9;
362 inode->i_bytes += bytes;
363 if (inode->i_bytes >= 512) {
365 inode->i_bytes -= 512;
367 spin_unlock(&inode->i_lock);
370 EXPORT_SYMBOL(inode_add_bytes);
372 void inode_sub_bytes(struct inode *inode, loff_t bytes)
374 spin_lock(&inode->i_lock);
375 inode->i_blocks -= bytes >> 9;
377 if (inode->i_bytes < bytes) {
379 inode->i_bytes += 512;
381 inode->i_bytes -= bytes;
382 spin_unlock(&inode->i_lock);
385 EXPORT_SYMBOL(inode_sub_bytes);
387 loff_t inode_get_bytes(struct inode *inode)
391 spin_lock(&inode->i_lock);
392 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
393 spin_unlock(&inode->i_lock);
397 EXPORT_SYMBOL(inode_get_bytes);
399 void inode_set_bytes(struct inode *inode, loff_t bytes)
401 /* Caller is here responsible for sufficient locking
402 * (ie. inode->i_lock) */
403 inode->i_blocks = bytes >> 9;
404 inode->i_bytes = bytes & 511;
407 EXPORT_SYMBOL(inode_set_bytes);