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827 lines
22 KiB
827 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/stat.c |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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*/ |
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|
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#include <linux/blkdev.h> |
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#include <linux/export.h> |
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#include <linux/mm.h> |
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#include <linux/errno.h> |
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#include <linux/file.h> |
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#include <linux/highuid.h> |
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#include <linux/fs.h> |
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#include <linux/namei.h> |
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#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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|
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#include "internal.h" |
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#include "mount.h" |
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|
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/** |
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* generic_fillattr - Fill in the basic attributes from the inode struct |
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* @mnt_userns: user namespace of the mount the inode was found from |
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* @inode: Inode to use as the source |
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* @stat: Where to fill in the attributes |
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* |
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* Fill in the basic attributes in the kstat structure from data that's to be |
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* found on the VFS inode structure. This is the default if no getattr inode |
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* operation is supplied. |
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* |
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* If the inode has been found through an idmapped mount the user namespace of |
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* the vfsmount must be passed through @mnt_userns. This function will then |
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* take care to map the inode according to @mnt_userns before filling in the |
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* uid and gid filds. On non-idmapped mounts or if permission checking is to be |
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* performed on the raw inode simply passs init_user_ns. |
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*/ |
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void generic_fillattr(struct user_namespace *mnt_userns, struct inode *inode, |
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struct kstat *stat) |
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{ |
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stat->dev = inode->i_sb->s_dev; |
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stat->ino = inode->i_ino; |
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stat->mode = inode->i_mode; |
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stat->nlink = inode->i_nlink; |
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stat->uid = i_uid_into_mnt(mnt_userns, inode); |
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stat->gid = i_gid_into_mnt(mnt_userns, inode); |
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stat->rdev = inode->i_rdev; |
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stat->size = i_size_read(inode); |
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stat->atime = inode->i_atime; |
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stat->mtime = inode->i_mtime; |
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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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EXPORT_SYMBOL(generic_fillattr); |
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|
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/** |
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* generic_fill_statx_attr - Fill in the statx attributes from the inode flags |
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* @inode: Inode to use as the source |
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* @stat: Where to fill in the attribute flags |
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* |
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* Fill in the STATX_ATTR_* flags in the kstat structure for properties of the |
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* inode that are published on i_flags and enforced by the VFS. |
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*/ |
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void generic_fill_statx_attr(struct inode *inode, struct kstat *stat) |
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{ |
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if (inode->i_flags & S_IMMUTABLE) |
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stat->attributes |= STATX_ATTR_IMMUTABLE; |
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if (inode->i_flags & S_APPEND) |
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stat->attributes |= STATX_ATTR_APPEND; |
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stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS; |
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} |
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EXPORT_SYMBOL(generic_fill_statx_attr); |
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|
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/** |
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* vfs_getattr_nosec - getattr without security checks |
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* @path: file to get attributes from |
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* @stat: structure to return attributes in |
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* @request_mask: STATX_xxx flags indicating what the caller wants |
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* @query_flags: Query mode (AT_STATX_SYNC_TYPE) |
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* |
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* Get attributes without calling security_inode_getattr. |
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* |
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* 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 |
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* 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, |
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u32 request_mask, unsigned int query_flags) |
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{ |
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struct user_namespace *mnt_userns; |
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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)); |
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stat->result_mask |= STATX_BASIC_STATS; |
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query_flags &= AT_STATX_SYNC_TYPE; |
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|
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/* allow the fs to override these if it really wants to */ |
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/* SB_NOATIME means filesystem supplies dummy atime value */ |
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if (inode->i_sb->s_flags & SB_NOATIME) |
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stat->result_mask &= ~STATX_ATIME; |
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|
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/* |
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* Note: If you add another clause to set an attribute flag, please |
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* update attributes_mask below. |
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*/ |
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if (IS_AUTOMOUNT(inode)) |
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stat->attributes |= STATX_ATTR_AUTOMOUNT; |
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|
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if (IS_DAX(inode)) |
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stat->attributes |= STATX_ATTR_DAX; |
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|
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stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT | |
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STATX_ATTR_DAX); |
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|
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mnt_userns = mnt_user_ns(path->mnt); |
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if (inode->i_op->getattr) |
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return inode->i_op->getattr(mnt_userns, path, stat, |
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request_mask, query_flags); |
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|
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generic_fillattr(mnt_userns, inode, stat); |
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return 0; |
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} |
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EXPORT_SYMBOL(vfs_getattr_nosec); |
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|
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/* |
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* vfs_getattr - Get the enhanced basic attributes of a file |
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* @path: The file of interest |
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* @stat: Where to return the statistics |
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* @request_mask: STATX_xxx flags indicating what the caller wants |
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* @query_flags: Query mode (AT_STATX_SYNC_TYPE) |
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* |
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* Ask the filesystem for a file's attributes. The caller must indicate in |
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* request_mask and query_flags to indicate what they want. |
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* |
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* If the file is remote, the filesystem can be forced to update the attributes |
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* from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can |
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* suppress the update by passing AT_STATX_DONT_SYNC. |
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* |
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* Bits must have been set in request_mask to indicate which attributes the |
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* caller wants retrieving. Any such attribute not requested may be returned |
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* anyway, but the value may be approximate, and, if remote, may not have been |
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* synchronised with the server. |
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* |
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* 0 will be returned on success, and a -ve error code if unsuccessful. |
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*/ |
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int vfs_getattr(const struct path *path, struct kstat *stat, |
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u32 request_mask, unsigned int query_flags) |
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{ |
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int retval; |
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|
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retval = security_inode_getattr(path); |
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if (retval) |
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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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|
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/** |
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* vfs_fstat - Get the basic attributes by file descriptor |
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* @fd: The file descriptor referring to the file of interest |
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* @stat: The result structure to fill in. |
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* |
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* This function is a wrapper around vfs_getattr(). The main difference is |
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* that it uses a file descriptor to determine the file location. |
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* |
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* 0 will be returned on success, and a -ve error code if unsuccessful. |
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*/ |
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int vfs_fstat(int fd, struct kstat *stat) |
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{ |
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struct fd f; |
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int error; |
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|
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f = fdget_raw(fd); |
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if (!f.file) |
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return -EBADF; |
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error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0); |
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fdput(f); |
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return error; |
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} |
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|
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int getname_statx_lookup_flags(int flags) |
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{ |
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int lookup_flags = 0; |
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|
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if (!(flags & AT_SYMLINK_NOFOLLOW)) |
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lookup_flags |= LOOKUP_FOLLOW; |
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if (!(flags & AT_NO_AUTOMOUNT)) |
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lookup_flags |= LOOKUP_AUTOMOUNT; |
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if (flags & AT_EMPTY_PATH) |
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lookup_flags |= LOOKUP_EMPTY; |
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|
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return lookup_flags; |
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} |
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|
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/** |
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* vfs_statx - Get basic and extra attributes by filename |
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* @dfd: A file descriptor representing the base dir for a relative filename |
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* @filename: The name of the file of interest |
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* @flags: Flags to control the query |
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* @stat: The result structure to fill in. |
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* @request_mask: STATX_xxx flags indicating what the caller wants |
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* |
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* This function is a wrapper around vfs_getattr(). The main difference is |
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* that it uses a filename and base directory to determine the file location. |
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* Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink |
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* at the given name from being referenced. |
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* |
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* 0 will be returned on success, and a -ve error code if unsuccessful. |
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*/ |
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static int vfs_statx(int dfd, struct filename *filename, int flags, |
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struct kstat *stat, u32 request_mask) |
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{ |
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struct path path; |
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unsigned int lookup_flags = getname_statx_lookup_flags(flags); |
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int error; |
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|
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if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH | |
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AT_STATX_SYNC_TYPE)) |
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return -EINVAL; |
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|
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retry: |
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error = filename_lookup(dfd, filename, lookup_flags, &path, NULL); |
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if (error) |
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goto out; |
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|
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error = vfs_getattr(&path, stat, request_mask, flags); |
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|
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stat->mnt_id = real_mount(path.mnt)->mnt_id; |
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stat->result_mask |= STATX_MNT_ID; |
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if (path.mnt->mnt_root == path.dentry) |
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stat->attributes |= STATX_ATTR_MOUNT_ROOT; |
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stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; |
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|
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/* Handle STATX_DIOALIGN for block devices. */ |
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if (request_mask & STATX_DIOALIGN) { |
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struct inode *inode = d_backing_inode(path.dentry); |
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|
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if (S_ISBLK(inode->i_mode)) |
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bdev_statx_dioalign(inode, stat); |
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} |
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|
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path_put(&path); |
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if (retry_estale(error, lookup_flags)) { |
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lookup_flags |= LOOKUP_REVAL; |
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goto retry; |
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} |
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out: |
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return error; |
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} |
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|
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int vfs_fstatat(int dfd, const char __user *filename, |
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struct kstat *stat, int flags) |
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{ |
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int ret; |
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int statx_flags = flags | AT_NO_AUTOMOUNT; |
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struct filename *name; |
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|
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name = getname_flags(filename, getname_statx_lookup_flags(statx_flags), NULL); |
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ret = vfs_statx(dfd, name, statx_flags, stat, STATX_BASIC_STATS); |
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putname(name); |
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return ret; |
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} |
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|
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#ifdef __ARCH_WANT_OLD_STAT |
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|
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/* |
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* For backward compatibility? Maybe this should be moved |
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* into arch/i386 instead? |
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*/ |
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static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) |
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{ |
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static int warncount = 5; |
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struct __old_kernel_stat tmp; |
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|
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if (warncount > 0) { |
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warncount--; |
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printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", |
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current->comm); |
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} else if (warncount < 0) { |
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/* it's laughable, but... */ |
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warncount = 0; |
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} |
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|
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memset(&tmp, 0, sizeof(struct __old_kernel_stat)); |
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tmp.st_dev = old_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) |
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return -EOVERFLOW; |
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tmp.st_mode = stat->mode; |
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tmp.st_nlink = stat->nlink; |
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if (tmp.st_nlink != stat->nlink) |
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return -EOVERFLOW; |
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SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
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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); |
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#if BITS_PER_LONG == 32 |
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if (stat->size > MAX_NON_LFS) |
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return -EOVERFLOW; |
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#endif |
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tmp.st_size = stat->size; |
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tmp.st_atime = stat->atime.tv_sec; |
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tmp.st_mtime = stat->mtime.tv_sec; |
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tmp.st_ctime = stat->ctime.tv_sec; |
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return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; |
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} |
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|
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SYSCALL_DEFINE2(stat, const char __user *, filename, |
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struct __old_kernel_stat __user *, statbuf) |
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{ |
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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); |
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if (error) |
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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, |
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struct __old_kernel_stat __user *, statbuf) |
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{ |
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struct kstat stat; |
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int error; |
|
|
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error = vfs_lstat(filename, &stat); |
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if (error) |
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return error; |
|
|
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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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{ |
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struct kstat stat; |
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int error = vfs_fstat(fd, &stat); |
|
|
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if (!error) |
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error = cp_old_stat(&stat, statbuf); |
|
|
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return error; |
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} |
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|
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#endif /* __ARCH_WANT_OLD_STAT */ |
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|
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#ifdef __ARCH_WANT_NEW_STAT |
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|
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#if BITS_PER_LONG == 32 |
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# define choose_32_64(a,b) a |
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#else |
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# define choose_32_64(a,b) b |
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#endif |
|
|
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#ifndef INIT_STRUCT_STAT_PADDING |
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# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) |
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#endif |
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|
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static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
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{ |
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struct stat tmp; |
|
|
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if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev)) |
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return -EOVERFLOW; |
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if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev)) |
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return -EOVERFLOW; |
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#if BITS_PER_LONG == 32 |
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if (stat->size > MAX_NON_LFS) |
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return -EOVERFLOW; |
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#endif |
|
|
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INIT_STRUCT_STAT_PADDING(tmp); |
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tmp.st_dev = new_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; |
|
tmp.st_mode = stat->mode; |
|
tmp.st_nlink = stat->nlink; |
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if (tmp.st_nlink != stat->nlink) |
|
return -EOVERFLOW; |
|
SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
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SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); |
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tmp.st_rdev = new_encode_dev(stat->rdev); |
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tmp.st_size = stat->size; |
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tmp.st_atime = stat->atime.tv_sec; |
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tmp.st_mtime = stat->mtime.tv_sec; |
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tmp.st_ctime = stat->ctime.tv_sec; |
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#ifdef STAT_HAVE_NSEC |
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tmp.st_atime_nsec = stat->atime.tv_nsec; |
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tmp.st_mtime_nsec = stat->mtime.tv_nsec; |
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tmp.st_ctime_nsec = stat->ctime.tv_nsec; |
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#endif |
|
tmp.st_blocks = stat->blocks; |
|
tmp.st_blksize = stat->blksize; |
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return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; |
|
} |
|
|
|
SYSCALL_DEFINE2(newstat, const char __user *, filename, |
|
struct stat __user *, statbuf) |
|
{ |
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struct kstat stat; |
|
int error = vfs_stat(filename, &stat); |
|
|
|
if (error) |
|
return error; |
|
return cp_new_stat(&stat, statbuf); |
|
} |
|
|
|
SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
|
struct stat __user *, statbuf) |
|
{ |
|
struct kstat stat; |
|
int error; |
|
|
|
error = vfs_lstat(filename, &stat); |
|
if (error) |
|
return error; |
|
|
|
return cp_new_stat(&stat, statbuf); |
|
} |
|
|
|
#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
|
SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
|
struct stat __user *, statbuf, int, flag) |
|
{ |
|
struct kstat stat; |
|
int error; |
|
|
|
error = vfs_fstatat(dfd, filename, &stat, flag); |
|
if (error) |
|
return error; |
|
return cp_new_stat(&stat, statbuf); |
|
} |
|
#endif |
|
|
|
SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
|
{ |
|
struct kstat stat; |
|
int error = vfs_fstat(fd, &stat); |
|
|
|
if (!error) |
|
error = cp_new_stat(&stat, statbuf); |
|
|
|
return error; |
|
} |
|
#endif |
|
|
|
static int do_readlinkat(int dfd, const char __user *pathname, |
|
char __user *buf, int bufsiz) |
|
{ |
|
struct path path; |
|
int error; |
|
int empty = 0; |
|
unsigned int lookup_flags = LOOKUP_EMPTY; |
|
|
|
if (bufsiz <= 0) |
|
return -EINVAL; |
|
|
|
retry: |
|
error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); |
|
if (!error) { |
|
struct inode *inode = d_backing_inode(path.dentry); |
|
|
|
error = empty ? -ENOENT : -EINVAL; |
|
/* |
|
* AFS mountpoints allow readlink(2) but are not symlinks |
|
*/ |
|
if (d_is_symlink(path.dentry) || inode->i_op->readlink) { |
|
error = security_inode_readlink(path.dentry); |
|
if (!error) { |
|
touch_atime(&path); |
|
error = vfs_readlink(path.dentry, buf, bufsiz); |
|
} |
|
} |
|
path_put(&path); |
|
if (retry_estale(error, lookup_flags)) { |
|
lookup_flags |= LOOKUP_REVAL; |
|
goto retry; |
|
} |
|
} |
|
return error; |
|
} |
|
|
|
SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
|
char __user *, buf, int, bufsiz) |
|
{ |
|
return do_readlinkat(dfd, pathname, buf, bufsiz); |
|
} |
|
|
|
SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
|
int, bufsiz) |
|
{ |
|
return do_readlinkat(AT_FDCWD, path, buf, bufsiz); |
|
} |
|
|
|
|
|
/* ---------- LFS-64 ----------- */ |
|
#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) |
|
|
|
#ifndef INIT_STRUCT_STAT64_PADDING |
|
# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) |
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#endif |
|
|
|
static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
|
{ |
|
struct stat64 tmp; |
|
|
|
INIT_STRUCT_STAT64_PADDING(tmp); |
|
#ifdef CONFIG_MIPS |
|
/* mips has weird padding, so we don't get 64 bits there */ |
|
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; |
|
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
|
return -EOVERFLOW; |
|
#ifdef STAT64_HAS_BROKEN_ST_INO |
|
tmp.__st_ino = stat->ino; |
|
#endif |
|
tmp.st_mode = stat->mode; |
|
tmp.st_nlink = stat->nlink; |
|
tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
|
tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); |
|
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; |
|
} |
|
|
|
SYSCALL_DEFINE2(stat64, const char __user *, filename, |
|
struct stat64 __user *, statbuf) |
|
{ |
|
struct kstat stat; |
|
int error = vfs_stat(filename, &stat); |
|
|
|
if (!error) |
|
error = cp_new_stat64(&stat, statbuf); |
|
|
|
return error; |
|
} |
|
|
|
SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
|
struct stat64 __user *, statbuf) |
|
{ |
|
struct kstat stat; |
|
int error = vfs_lstat(filename, &stat); |
|
|
|
if (!error) |
|
error = cp_new_stat64(&stat, statbuf); |
|
|
|
return error; |
|
} |
|
|
|
SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) |
|
{ |
|
struct kstat stat; |
|
int error = vfs_fstat(fd, &stat); |
|
|
|
if (!error) |
|
error = cp_new_stat64(&stat, statbuf); |
|
|
|
return error; |
|
} |
|
|
|
SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
|
struct stat64 __user *, statbuf, int, flag) |
|
{ |
|
struct kstat stat; |
|
int error; |
|
|
|
error = vfs_fstatat(dfd, filename, &stat, flag); |
|
if (error) |
|
return error; |
|
return cp_new_stat64(&stat, statbuf); |
|
} |
|
#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ |
|
|
|
static noinline_for_stack int |
|
cp_statx(const struct kstat *stat, struct statx __user *buffer) |
|
{ |
|
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; |
|
tmp.stx_attributes_mask = stat->attributes_mask; |
|
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); |
|
tmp.stx_mnt_id = stat->mnt_id; |
|
tmp.stx_dio_mem_align = stat->dio_mem_align; |
|
tmp.stx_dio_offset_align = stat->dio_offset_align; |
|
|
|
return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
|
} |
|
|
|
int do_statx(int dfd, struct filename *filename, unsigned int flags, |
|
unsigned int mask, struct statx __user *buffer) |
|
{ |
|
struct kstat stat; |
|
int error; |
|
|
|
if (mask & STATX__RESERVED) |
|
return -EINVAL; |
|
if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE) |
|
return -EINVAL; |
|
|
|
error = vfs_statx(dfd, filename, flags, &stat, mask); |
|
if (error) |
|
return error; |
|
|
|
return cp_statx(&stat, buffer); |
|
} |
|
|
|
/** |
|
* sys_statx - System call to get enhanced stats |
|
* @dfd: Base directory to pathwalk from *or* fd to stat. |
|
* @filename: File to stat or "" with AT_EMPTY_PATH |
|
* @flags: AT_* flags to control pathwalk. |
|
* @mask: Parts of statx struct actually required. |
|
* @buffer: Result buffer. |
|
* |
|
* 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. |
|
*/ |
|
SYSCALL_DEFINE5(statx, |
|
int, dfd, const char __user *, filename, unsigned, flags, |
|
unsigned int, mask, |
|
struct statx __user *, buffer) |
|
{ |
|
int ret; |
|
struct filename *name; |
|
|
|
name = getname_flags(filename, getname_statx_lookup_flags(flags), NULL); |
|
ret = do_statx(dfd, name, flags, mask, buffer); |
|
putname(name); |
|
|
|
return ret; |
|
} |
|
|
|
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT) |
|
static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) |
|
{ |
|
struct compat_stat tmp; |
|
|
|
if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev)) |
|
return -EOVERFLOW; |
|
if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev)) |
|
return -EOVERFLOW; |
|
|
|
memset(&tmp, 0, sizeof(tmp)); |
|
tmp.st_dev = new_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 = new_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 |
|
|
|
/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
|
void __inode_add_bytes(struct inode *inode, loff_t bytes) |
|
{ |
|
inode->i_blocks += bytes >> 9; |
|
bytes &= 511; |
|
inode->i_bytes += bytes; |
|
if (inode->i_bytes >= 512) { |
|
inode->i_blocks++; |
|
inode->i_bytes -= 512; |
|
} |
|
} |
|
EXPORT_SYMBOL(__inode_add_bytes); |
|
|
|
void inode_add_bytes(struct inode *inode, loff_t bytes) |
|
{ |
|
spin_lock(&inode->i_lock); |
|
__inode_add_bytes(inode, bytes); |
|
spin_unlock(&inode->i_lock); |
|
} |
|
|
|
EXPORT_SYMBOL(inode_add_bytes); |
|
|
|
void __inode_sub_bytes(struct inode *inode, loff_t bytes) |
|
{ |
|
inode->i_blocks -= bytes >> 9; |
|
bytes &= 511; |
|
if (inode->i_bytes < bytes) { |
|
inode->i_blocks--; |
|
inode->i_bytes += 512; |
|
} |
|
inode->i_bytes -= bytes; |
|
} |
|
|
|
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); |
|
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); |
|
ret = __inode_get_bytes(inode); |
|
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);
|
|
|