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fs/stat.c
19.3 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/fs/stat.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
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#include <linux/export.h> |
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#include <linux/mm.h> #include <linux/errno.h> #include <linux/file.h> |
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#include <linux/highuid.h> #include <linux/fs.h> #include <linux/namei.h> #include <linux/security.h> |
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#include <linux/cred.h> |
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#include <linux/syscalls.h> |
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#include <linux/pagemap.h> |
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#include <linux/compat.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/unistd.h> |
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/** * generic_fillattr - Fill in the basic attributes from the inode struct * @inode: Inode to use as the source * @stat: Where to fill in the attributes * * Fill in the basic attributes in the kstat structure from data that's to be * found on the VFS inode structure. This is the default if no getattr inode * operation is supplied. */ |
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void generic_fillattr(struct inode *inode, struct kstat *stat) { stat->dev = inode->i_sb->s_dev; stat->ino = inode->i_ino; stat->mode = inode->i_mode; stat->nlink = inode->i_nlink; stat->uid = inode->i_uid; stat->gid = inode->i_gid; stat->rdev = inode->i_rdev; |
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stat->size = i_size_read(inode); |
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stat->atime = inode->i_atime; stat->mtime = inode->i_mtime; stat->ctime = inode->i_ctime; |
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stat->blksize = i_blocksize(inode); |
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stat->blocks = inode->i_blocks; |
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|
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if (IS_NOATIME(inode)) stat->result_mask &= ~STATX_ATIME; if (IS_AUTOMOUNT(inode)) stat->attributes |= STATX_ATTR_AUTOMOUNT; } |
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EXPORT_SYMBOL(generic_fillattr); |
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/** * vfs_getattr_nosec - getattr without security checks * @path: file to get attributes from * @stat: structure to return attributes in |
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* @request_mask: STATX_xxx flags indicating what the caller wants * @query_flags: Query mode (KSTAT_QUERY_FLAGS) |
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* * Get attributes without calling security_inode_getattr. * * Currently the only caller other than vfs_getattr is internal to the |
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* filehandle lookup code, which uses only the inode number and returns no * attributes to any user. Any other code probably wants vfs_getattr. |
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*/ |
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int vfs_getattr_nosec(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
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{ |
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struct inode *inode = d_backing_inode(path->dentry); |
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|
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memset(stat, 0, sizeof(*stat)); stat->result_mask |= STATX_BASIC_STATS; request_mask &= STATX_ALL; query_flags &= KSTAT_QUERY_FLAGS; |
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if (inode->i_op->getattr) |
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return inode->i_op->getattr(path, stat, request_mask, query_flags); |
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generic_fillattr(inode, stat); |
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return 0; } |
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EXPORT_SYMBOL(vfs_getattr_nosec); |
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/* * vfs_getattr - Get the enhanced basic attributes of a file * @path: The file of interest * @stat: Where to return the statistics * @request_mask: STATX_xxx flags indicating what the caller wants * @query_flags: Query mode (KSTAT_QUERY_FLAGS) * * Ask the filesystem for a file's attributes. The caller must indicate in * request_mask and query_flags to indicate what they want. * * If the file is remote, the filesystem can be forced to update the attributes * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can * suppress the update by passing AT_STATX_DONT_SYNC. * * Bits must have been set in request_mask to indicate which attributes the * caller wants retrieving. Any such attribute not requested may be returned * anyway, but the value may be approximate, and, if remote, may not have been * synchronised with the server. * * 0 will be returned on success, and a -ve error code if unsuccessful. */ int vfs_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
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{ int retval; |
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retval = security_inode_getattr(path); |
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if (retval) return retval; |
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return vfs_getattr_nosec(path, stat, request_mask, query_flags); |
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} |
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EXPORT_SYMBOL(vfs_getattr); |
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/** * vfs_statx_fd - Get the enhanced basic attributes by file descriptor * @fd: The file descriptor referring to the file of interest * @stat: The result structure to fill in. * @request_mask: STATX_xxx flags indicating what the caller wants * @query_flags: Query mode (KSTAT_QUERY_FLAGS) * * This function is a wrapper around vfs_getattr(). The main difference is * that it uses a file descriptor to determine the file location. * * 0 will be returned on success, and a -ve error code if unsuccessful. */ int vfs_statx_fd(unsigned int fd, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
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{ |
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struct fd f; |
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int error = -EBADF; |
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if (query_flags & ~KSTAT_QUERY_FLAGS) return -EINVAL; f = fdget_raw(fd); |
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if (f.file) { |
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error = vfs_getattr(&f.file->f_path, stat, request_mask, query_flags); |
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fdput(f); |
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} return error; } |
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EXPORT_SYMBOL(vfs_statx_fd); |
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|
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/** * vfs_statx - Get basic and extra attributes by filename * @dfd: A file descriptor representing the base dir for a relative filename * @filename: The name of the file of interest * @flags: Flags to control the query * @stat: The result structure to fill in. * @request_mask: STATX_xxx flags indicating what the caller wants * * This function is a wrapper around vfs_getattr(). The main difference is * that it uses a filename and base directory to determine the file location. * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink * at the given name from being referenced. * |
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* 0 will be returned on success, and a -ve error code if unsuccessful. */ int vfs_statx(int dfd, const char __user *filename, int flags, struct kstat *stat, u32 request_mask) |
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{ |
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struct path path; |
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int error = -EINVAL; |
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unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT; |
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|
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if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0) return -EINVAL; |
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|
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if (flags & AT_SYMLINK_NOFOLLOW) lookup_flags &= ~LOOKUP_FOLLOW; if (flags & AT_NO_AUTOMOUNT) lookup_flags &= ~LOOKUP_AUTOMOUNT; if (flags & AT_EMPTY_PATH) |
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lookup_flags |= LOOKUP_EMPTY; |
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|
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retry: |
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error = user_path_at(dfd, filename, lookup_flags, &path); if (error) goto out; |
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error = vfs_getattr(&path, stat, request_mask, flags); |
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path_put(&path); |
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if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } |
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out: return error; } |
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EXPORT_SYMBOL(vfs_statx); |
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#ifdef __ARCH_WANT_OLD_STAT /* * For backward compatibility? Maybe this should be moved * into arch/i386 instead? */ static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) { static int warncount = 5; struct __old_kernel_stat tmp; |
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|
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if (warncount > 0) { warncount--; printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary. ", current->comm); } else if (warncount < 0) { /* it's laughable, but... */ warncount = 0; } memset(&tmp, 0, sizeof(struct __old_kernel_stat)); tmp.st_dev = old_encode_dev(stat->dev); tmp.st_ino = stat->ino; |
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if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; |
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tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; if (tmp.st_nlink != stat->nlink) return -EOVERFLOW; |
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SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); |
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tmp.st_rdev = old_encode_dev(stat->rdev); #if BITS_PER_LONG == 32 if (stat->size > MAX_NON_LFS) return -EOVERFLOW; |
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#endif |
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tmp.st_size = stat->size; tmp.st_atime = stat->atime.tv_sec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_ctime = stat->ctime.tv_sec; return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; } |
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SYSCALL_DEFINE2(stat, const char __user *, filename, struct __old_kernel_stat __user *, statbuf) |
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{ struct kstat stat; |
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int error; |
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|
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error = vfs_stat(filename, &stat); if (error) return error; |
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|
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return cp_old_stat(&stat, statbuf); |
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} |
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|
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SYSCALL_DEFINE2(lstat, const char __user *, filename, struct __old_kernel_stat __user *, statbuf) |
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{ struct kstat stat; |
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int error; |
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|
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error = vfs_lstat(filename, &stat); if (error) return error; |
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|
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return cp_old_stat(&stat, statbuf); |
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} |
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SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) |
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{ struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_old_stat(&stat, statbuf); return error; } #endif /* __ARCH_WANT_OLD_STAT */ |
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#if BITS_PER_LONG == 32 # define choose_32_64(a,b) a #else # define choose_32_64(a,b) b #endif |
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#define valid_dev(x) choose_32_64(old_valid_dev(x),true) |
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#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) |
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#ifndef INIT_STRUCT_STAT_PADDING # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) #endif |
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static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) { struct stat tmp; |
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if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) |
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return -EOVERFLOW; |
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#if BITS_PER_LONG == 32 if (stat->size > MAX_NON_LFS) |
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return -EOVERFLOW; #endif |
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INIT_STRUCT_STAT_PADDING(tmp); |
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tmp.st_dev = encode_dev(stat->dev); |
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tmp.st_ino = stat->ino; |
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if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; |
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tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; if (tmp.st_nlink != stat->nlink) return -EOVERFLOW; |
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SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); |
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tmp.st_rdev = encode_dev(stat->rdev); |
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tmp.st_size = stat->size; tmp.st_atime = stat->atime.tv_sec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_ctime = stat->ctime.tv_sec; #ifdef STAT_HAVE_NSEC tmp.st_atime_nsec = stat->atime.tv_nsec; tmp.st_mtime_nsec = stat->mtime.tv_nsec; tmp.st_ctime_nsec = stat->ctime.tv_nsec; #endif tmp.st_blocks = stat->blocks; tmp.st_blksize = stat->blksize; return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; } |
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SYSCALL_DEFINE2(newstat, const char __user *, filename, struct stat __user *, statbuf) |
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{ struct kstat stat; |
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int error = vfs_stat(filename, &stat); |
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|
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if (error) return error; return cp_new_stat(&stat, statbuf); |
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} |
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SYSCALL_DEFINE2(newlstat, const char __user *, filename, struct stat __user *, statbuf) |
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{ struct kstat stat; |
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int error; |
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|
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error = vfs_lstat(filename, &stat); if (error) return error; |
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|
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return cp_new_stat(&stat, statbuf); |
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} |
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#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
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SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
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struct stat __user *, statbuf, int, flag) |
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{ struct kstat stat; |
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int error; |
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|
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error = vfs_fstatat(dfd, filename, &stat, flag); if (error) return error; return cp_new_stat(&stat, statbuf); |
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} |
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#endif |
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|
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SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
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{ struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_new_stat(&stat, statbuf); return error; } |
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static int do_readlinkat(int dfd, const char __user *pathname, char __user *buf, int bufsiz) |
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{ |
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struct path path; |
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int error; |
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int empty = 0; |
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unsigned int lookup_flags = LOOKUP_EMPTY; |
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if (bufsiz <= 0) return -EINVAL; |
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retry: error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); |
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if (!error) { |
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struct inode *inode = d_backing_inode(path.dentry); |
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|
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error = empty ? -ENOENT : -EINVAL; |
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/* * AFS mountpoints allow readlink(2) but are not symlinks */ if (d_is_symlink(path.dentry) || inode->i_op->readlink) { |
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error = security_inode_readlink(path.dentry); |
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if (!error) { |
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touch_atime(&path); |
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error = vfs_readlink(path.dentry, buf, bufsiz); |
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} } |
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path_put(&path); |
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if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } |
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} return error; } |
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SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, char __user *, buf, int, bufsiz) { return do_readlinkat(dfd, pathname, buf, bufsiz); } |
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SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, int, bufsiz) |
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{ |
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return do_readlinkat(AT_FDCWD, path, buf, bufsiz); |
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} |
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/* ---------- LFS-64 ----------- */ |
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#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
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#ifndef INIT_STRUCT_STAT64_PADDING # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) #endif |
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static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) { struct stat64 tmp; |
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INIT_STRUCT_STAT64_PADDING(tmp); |
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#ifdef CONFIG_MIPS /* mips has weird padding, so we don't get 64 bits there */ |
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tmp.st_dev = new_encode_dev(stat->dev); tmp.st_rdev = new_encode_dev(stat->rdev); #else tmp.st_dev = huge_encode_dev(stat->dev); tmp.st_rdev = huge_encode_dev(stat->rdev); #endif tmp.st_ino = stat->ino; |
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if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; |
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#ifdef STAT64_HAS_BROKEN_ST_INO tmp.__st_ino = stat->ino; #endif tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; |
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tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); |
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tmp.st_atime = stat->atime.tv_sec; tmp.st_atime_nsec = stat->atime.tv_nsec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_mtime_nsec = stat->mtime.tv_nsec; tmp.st_ctime = stat->ctime.tv_sec; tmp.st_ctime_nsec = stat->ctime.tv_nsec; tmp.st_size = stat->size; tmp.st_blocks = stat->blocks; tmp.st_blksize = stat->blksize; return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; } |
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SYSCALL_DEFINE2(stat64, const char __user *, filename, struct stat64 __user *, statbuf) |
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{ struct kstat stat; int error = vfs_stat(filename, &stat); if (!error) error = cp_new_stat64(&stat, statbuf); return error; } |
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SYSCALL_DEFINE2(lstat64, const char __user *, filename, struct stat64 __user *, statbuf) |
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{ struct kstat stat; int error = vfs_lstat(filename, &stat); if (!error) error = cp_new_stat64(&stat, statbuf); return error; } |
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SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) |
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{ struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_new_stat64(&stat, statbuf); return error; } |
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SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
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struct stat64 __user *, statbuf, int, flag) |
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{ struct kstat stat; |
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int error; |
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|
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error = vfs_fstatat(dfd, filename, &stat, flag); if (error) return error; return cp_new_stat64(&stat, statbuf); |
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} |
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#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
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static noinline_for_stack int cp_statx(const struct kstat *stat, struct statx __user *buffer) |
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{ |
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struct statx tmp; memset(&tmp, 0, sizeof(tmp)); tmp.stx_mask = stat->result_mask; tmp.stx_blksize = stat->blksize; tmp.stx_attributes = stat->attributes; tmp.stx_nlink = stat->nlink; tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid); tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid); tmp.stx_mode = stat->mode; tmp.stx_ino = stat->ino; tmp.stx_size = stat->size; tmp.stx_blocks = stat->blocks; |
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tmp.stx_attributes_mask = stat->attributes_mask; |
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tmp.stx_atime.tv_sec = stat->atime.tv_sec; tmp.stx_atime.tv_nsec = stat->atime.tv_nsec; tmp.stx_btime.tv_sec = stat->btime.tv_sec; tmp.stx_btime.tv_nsec = stat->btime.tv_nsec; tmp.stx_ctime.tv_sec = stat->ctime.tv_sec; tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec; tmp.stx_mtime.tv_sec = stat->mtime.tv_sec; tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec; tmp.stx_rdev_major = MAJOR(stat->rdev); tmp.stx_rdev_minor = MINOR(stat->rdev); tmp.stx_dev_major = MAJOR(stat->dev); tmp.stx_dev_minor = MINOR(stat->dev); return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
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} /** * sys_statx - System call to get enhanced stats * @dfd: Base directory to pathwalk from *or* fd to stat. |
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* @filename: File to stat or "" with AT_EMPTY_PATH |
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* @flags: AT_* flags to control pathwalk. * @mask: Parts of statx struct actually required. * @buffer: Result buffer. * |
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* Note that fstat() can be emulated by setting dfd to the fd of interest, * supplying "" as the filename and setting AT_EMPTY_PATH in the flags. |
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*/ SYSCALL_DEFINE5(statx, int, dfd, const char __user *, filename, unsigned, flags, unsigned int, mask, struct statx __user *, buffer) { struct kstat stat; int error; |
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if (mask & STATX__RESERVED) return -EINVAL; |
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if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) return -EINVAL; |
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error = vfs_statx(dfd, filename, flags, &stat, mask); |
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if (error) return error; |
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return cp_statx(&stat, buffer); |
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} |
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#ifdef CONFIG_COMPAT static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) { struct compat_stat tmp; if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) return -EOVERFLOW; memset(&tmp, 0, sizeof(tmp)); tmp.st_dev = old_encode_dev(stat->dev); tmp.st_ino = stat->ino; if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; if (tmp.st_nlink != stat->nlink) return -EOVERFLOW; SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); tmp.st_rdev = old_encode_dev(stat->rdev); if ((u64) stat->size > MAX_NON_LFS) return -EOVERFLOW; tmp.st_size = stat->size; tmp.st_atime = stat->atime.tv_sec; tmp.st_atime_nsec = stat->atime.tv_nsec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_mtime_nsec = stat->mtime.tv_nsec; tmp.st_ctime = stat->ctime.tv_sec; tmp.st_ctime_nsec = stat->ctime.tv_nsec; tmp.st_blocks = stat->blocks; tmp.st_blksize = stat->blksize; return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; } COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, struct compat_stat __user *, statbuf) { struct kstat stat; int error; error = vfs_stat(filename, &stat); if (error) return error; return cp_compat_stat(&stat, statbuf); } COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, struct compat_stat __user *, statbuf) { struct kstat stat; int error; error = vfs_lstat(filename, &stat); if (error) return error; return cp_compat_stat(&stat, statbuf); } #ifndef __ARCH_WANT_STAT64 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, const char __user *, filename, struct compat_stat __user *, statbuf, int, flag) { struct kstat stat; int error; error = vfs_fstatat(dfd, filename, &stat, flag); if (error) return error; return cp_compat_stat(&stat, statbuf); } #endif COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct compat_stat __user *, statbuf) { struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_compat_stat(&stat, statbuf); return error; } #endif |
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/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ void __inode_add_bytes(struct inode *inode, loff_t bytes) |
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{ |
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inode->i_blocks += bytes >> 9; bytes &= 511; inode->i_bytes += bytes; if (inode->i_bytes >= 512) { inode->i_blocks++; inode->i_bytes -= 512; } |
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} |
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EXPORT_SYMBOL(__inode_add_bytes); |
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void inode_add_bytes(struct inode *inode, loff_t bytes) { spin_lock(&inode->i_lock); __inode_add_bytes(inode, bytes); |
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spin_unlock(&inode->i_lock); } EXPORT_SYMBOL(inode_add_bytes); |
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void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
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{ |
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inode->i_blocks -= bytes >> 9; bytes &= 511; if (inode->i_bytes < bytes) { inode->i_blocks--; inode->i_bytes += 512; } inode->i_bytes -= bytes; |
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} EXPORT_SYMBOL(__inode_sub_bytes); void inode_sub_bytes(struct inode *inode, loff_t bytes) { spin_lock(&inode->i_lock); __inode_sub_bytes(inode, bytes); |
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spin_unlock(&inode->i_lock); } EXPORT_SYMBOL(inode_sub_bytes); loff_t inode_get_bytes(struct inode *inode) { loff_t ret; spin_lock(&inode->i_lock); |
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ret = __inode_get_bytes(inode); |
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spin_unlock(&inode->i_lock); return ret; } EXPORT_SYMBOL(inode_get_bytes); void inode_set_bytes(struct inode *inode, loff_t bytes) { /* Caller is here responsible for sufficient locking * (ie. inode->i_lock) */ inode->i_blocks = bytes >> 9; inode->i_bytes = bytes & 511; } EXPORT_SYMBOL(inode_set_bytes); |