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>
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 = inode->i_blksize;
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);
54 struct super_block *s = inode->i_sb;
56 blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
57 stat->blocks = (s->s_blocksize / 512) * blocks;
58 stat->blksize = s->s_blocksize;
63 EXPORT_SYMBOL(vfs_getattr);
65 int vfs_stat(char __user *name, struct kstat *stat)
70 error = user_path_walk(name, &nd);
72 error = vfs_getattr(nd.mnt, nd.dentry, stat);
78 EXPORT_SYMBOL(vfs_stat);
80 int vfs_lstat(char __user *name, struct kstat *stat)
85 error = user_path_walk_link(name, &nd);
87 error = vfs_getattr(nd.mnt, nd.dentry, stat);
93 EXPORT_SYMBOL(vfs_lstat);
95 int vfs_fstat(unsigned int fd, struct kstat *stat)
97 struct file *f = fget(fd);
101 error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
107 EXPORT_SYMBOL(vfs_fstat);
109 #ifdef __ARCH_WANT_OLD_STAT
112 * For backward compatibility? Maybe this should be moved
113 * into arch/i386 instead?
115 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
117 static int warncount = 5;
118 struct __old_kernel_stat tmp;
122 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
124 } else if (warncount < 0) {
125 /* it's laughable, but... */
129 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
130 tmp.st_dev = old_encode_dev(stat->dev);
131 tmp.st_ino = stat->ino;
132 tmp.st_mode = stat->mode;
133 tmp.st_nlink = stat->nlink;
134 SET_UID(tmp.st_uid, stat->uid);
135 SET_GID(tmp.st_gid, stat->gid);
136 tmp.st_rdev = old_encode_dev(stat->rdev);
137 #if BITS_PER_LONG == 32
138 if (stat->size > MAX_NON_LFS)
141 tmp.st_size = stat->size;
142 tmp.st_atime = stat->atime.tv_sec;
143 tmp.st_mtime = stat->mtime.tv_sec;
144 tmp.st_ctime = stat->ctime.tv_sec;
145 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
148 asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
151 int error = vfs_stat(filename, &stat);
154 error = cp_old_stat(&stat, statbuf);
158 asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
161 int error = vfs_lstat(filename, &stat);
164 error = cp_old_stat(&stat, statbuf);
168 asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
171 int error = vfs_fstat(fd, &stat);
174 error = cp_old_stat(&stat, statbuf);
179 #endif /* __ARCH_WANT_OLD_STAT */
181 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
185 #if BITS_PER_LONG == 32
186 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
189 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
193 memset(&tmp, 0, sizeof(tmp));
194 #if BITS_PER_LONG == 32
195 tmp.st_dev = old_encode_dev(stat->dev);
197 tmp.st_dev = new_encode_dev(stat->dev);
199 tmp.st_ino = stat->ino;
200 tmp.st_mode = stat->mode;
201 tmp.st_nlink = stat->nlink;
202 SET_UID(tmp.st_uid, stat->uid);
203 SET_GID(tmp.st_gid, stat->gid);
204 #if BITS_PER_LONG == 32
205 tmp.st_rdev = old_encode_dev(stat->rdev);
207 tmp.st_rdev = new_encode_dev(stat->rdev);
209 #if BITS_PER_LONG == 32
210 if (stat->size > MAX_NON_LFS)
213 tmp.st_size = stat->size;
214 tmp.st_atime = stat->atime.tv_sec;
215 tmp.st_mtime = stat->mtime.tv_sec;
216 tmp.st_ctime = stat->ctime.tv_sec;
217 #ifdef STAT_HAVE_NSEC
218 tmp.st_atime_nsec = stat->atime.tv_nsec;
219 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
220 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
222 tmp.st_blocks = stat->blocks;
223 tmp.st_blksize = stat->blksize;
224 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
227 asmlinkage long sys_newstat(char __user * filename, struct stat __user * statbuf)
230 int error = vfs_stat(filename, &stat);
233 error = cp_new_stat(&stat, statbuf);
237 asmlinkage long sys_newlstat(char __user * filename, struct stat __user * statbuf)
240 int error = vfs_lstat(filename, &stat);
243 error = cp_new_stat(&stat, statbuf);
247 asmlinkage long sys_newfstat(unsigned int fd, struct stat __user * statbuf)
250 int error = vfs_fstat(fd, &stat);
253 error = cp_new_stat(&stat, statbuf);
258 asmlinkage long sys_readlink(const char __user * path, char __user * buf, int bufsiz)
266 error = user_path_walk_link(path, &nd);
268 struct inode * inode = nd.dentry->d_inode;
271 if (inode->i_op && inode->i_op->readlink) {
272 error = security_inode_readlink(nd.dentry);
274 touch_atime(nd.mnt, nd.dentry);
275 error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
284 /* ---------- LFS-64 ----------- */
285 #ifdef __ARCH_WANT_STAT64
287 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
291 memset(&tmp, 0, sizeof(struct stat64));
293 /* mips has weird padding, so we don't get 64 bits there */
294 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
296 tmp.st_dev = new_encode_dev(stat->dev);
297 tmp.st_rdev = new_encode_dev(stat->rdev);
299 tmp.st_dev = huge_encode_dev(stat->dev);
300 tmp.st_rdev = huge_encode_dev(stat->rdev);
302 tmp.st_ino = stat->ino;
303 #ifdef STAT64_HAS_BROKEN_ST_INO
304 tmp.__st_ino = stat->ino;
306 tmp.st_mode = stat->mode;
307 tmp.st_nlink = stat->nlink;
308 tmp.st_uid = stat->uid;
309 tmp.st_gid = stat->gid;
310 tmp.st_atime = stat->atime.tv_sec;
311 tmp.st_atime_nsec = stat->atime.tv_nsec;
312 tmp.st_mtime = stat->mtime.tv_sec;
313 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
314 tmp.st_ctime = stat->ctime.tv_sec;
315 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
316 tmp.st_size = stat->size;
317 tmp.st_blocks = stat->blocks;
318 tmp.st_blksize = stat->blksize;
319 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
322 asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
325 int error = vfs_stat(filename, &stat);
328 error = cp_new_stat64(&stat, statbuf);
332 asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
335 int error = vfs_lstat(filename, &stat);
338 error = cp_new_stat64(&stat, statbuf);
342 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
345 int error = vfs_fstat(fd, &stat);
348 error = cp_new_stat64(&stat, statbuf);
353 #endif /* __ARCH_WANT_STAT64 */
355 void inode_add_bytes(struct inode *inode, loff_t bytes)
357 spin_lock(&inode->i_lock);
358 inode->i_blocks += bytes >> 9;
360 inode->i_bytes += bytes;
361 if (inode->i_bytes >= 512) {
363 inode->i_bytes -= 512;
365 spin_unlock(&inode->i_lock);
368 EXPORT_SYMBOL(inode_add_bytes);
370 void inode_sub_bytes(struct inode *inode, loff_t bytes)
372 spin_lock(&inode->i_lock);
373 inode->i_blocks -= bytes >> 9;
375 if (inode->i_bytes < bytes) {
377 inode->i_bytes += 512;
379 inode->i_bytes -= bytes;
380 spin_unlock(&inode->i_lock);
383 EXPORT_SYMBOL(inode_sub_bytes);
385 loff_t inode_get_bytes(struct inode *inode)
389 spin_lock(&inode->i_lock);
390 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
391 spin_unlock(&inode->i_lock);
395 EXPORT_SYMBOL(inode_get_bytes);
397 void inode_set_bytes(struct inode *inode, loff_t bytes)
399 /* Caller is here responsible for sufficient locking
400 * (ie. inode->i_lock) */
401 inode->i_blocks = bytes >> 9;
402 inode->i_bytes = bytes & 511;
405 EXPORT_SYMBOL(inode_set_bytes);