diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/internal.h | 2 | ||||
| -rw-r--r-- | fs/namespace.c | 64 | ||||
| -rw-r--r-- | fs/open.c | 4 | ||||
| -rw-r--r-- | fs/xattr.c | 9 |
4 files changed, 9 insertions, 70 deletions
diff --git a/fs/internal.h b/fs/internal.h index 9c3b4c40e582..abb41f346b18 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -80,10 +80,8 @@ extern void __init mnt_init(void); extern int __mnt_want_write(struct vfsmount *); extern int __mnt_want_write_file(struct file *); -extern int mnt_want_write_file_path(struct file *); extern void __mnt_drop_write(struct vfsmount *); extern void __mnt_drop_write_file(struct file *); -extern void mnt_drop_write_file_path(struct file *); /* * fs_struct.c diff --git a/fs/namespace.c b/fs/namespace.c index 76a742e36b32..c16921dba157 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -431,18 +431,13 @@ int __mnt_want_write_file(struct file *file) } /** - * mnt_want_write_file_path - get write access to a file's mount + * mnt_want_write_file - get write access to a file's mount * @file: the file who's mount on which to take a write * * This is like mnt_want_write, but it takes a file and can * do some optimisations if the file is open for write already - * - * Called by the vfs for cases when we have an open file at hand, but will do an - * inode operation on it (important distinction for files opened on overlayfs, - * since the file operations will come from the real underlying file, while - * inode operations come from the overlay). */ -int mnt_want_write_file_path(struct file *file) +int mnt_want_write_file(struct file *file) { int ret; @@ -452,53 +447,6 @@ int mnt_want_write_file_path(struct file *file) sb_end_write(file->f_path.mnt->mnt_sb); return ret; } - -static inline int may_write_real(struct file *file) -{ - struct dentry *dentry = file->f_path.dentry; - struct dentry *upperdentry; - - /* Writable file? */ - if (file->f_mode & FMODE_WRITER) - return 0; - - /* Not overlayfs? */ - if (likely(!(dentry->d_flags & DCACHE_OP_REAL))) - return 0; - - /* File refers to upper, writable layer? */ - upperdentry = d_real(dentry, NULL, 0, D_REAL_UPPER); - if (upperdentry && file_inode(file) == d_inode(upperdentry)) - return 0; - - /* Lower layer: can't write to real file, sorry... */ - return -EPERM; -} - -/** - * mnt_want_write_file - get write access to a file's mount - * @file: the file who's mount on which to take a write - * - * This is like mnt_want_write, but it takes a file and can - * do some optimisations if the file is open for write already - * - * Mostly called by filesystems from their ioctl operation before performing - * modification. On overlayfs this needs to check if the file is on a read-only - * lower layer and deny access in that case. - */ -int mnt_want_write_file(struct file *file) -{ - int ret; - - ret = may_write_real(file); - if (!ret) { - sb_start_write(file_inode(file)->i_sb); - ret = __mnt_want_write_file(file); - if (ret) - sb_end_write(file_inode(file)->i_sb); - } - return ret; -} EXPORT_SYMBOL_GPL(mnt_want_write_file); /** @@ -536,15 +484,9 @@ void __mnt_drop_write_file(struct file *file) __mnt_drop_write(file->f_path.mnt); } -void mnt_drop_write_file_path(struct file *file) -{ - mnt_drop_write(file->f_path.mnt); -} - void mnt_drop_write_file(struct file *file) { - __mnt_drop_write(file->f_path.mnt); - sb_end_write(file_inode(file)->i_sb); + mnt_drop_write(file->f_path.mnt); } EXPORT_SYMBOL(mnt_drop_write_file); diff --git a/fs/open.c b/fs/open.c index fed24862ef83..a3c03a4a9078 100644 --- a/fs/open.c +++ b/fs/open.c @@ -707,12 +707,12 @@ int ksys_fchown(unsigned int fd, uid_t user, gid_t group) if (!f.file) goto out; - error = mnt_want_write_file_path(f.file); + error = mnt_want_write_file(f.file); if (error) goto out_fput; audit_file(f.file); error = chown_common(&f.file->f_path, user, group); - mnt_drop_write_file_path(f.file); + mnt_drop_write_file(f.file); out_fput: fdput(f); out: diff --git a/fs/xattr.c b/fs/xattr.c index f9cb1db187b7..3a24027c062d 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -23,7 +23,6 @@ #include <linux/posix_acl_xattr.h> #include <linux/uaccess.h> -#include "internal.h" static const char * strcmp_prefix(const char *a, const char *a_prefix) @@ -501,10 +500,10 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name, if (!f.file) return error; audit_file(f.file); - error = mnt_want_write_file_path(f.file); + error = mnt_want_write_file(f.file); if (!error) { error = setxattr(f.file->f_path.dentry, name, value, size, flags); - mnt_drop_write_file_path(f.file); + mnt_drop_write_file(f.file); } fdput(f); return error; @@ -733,10 +732,10 @@ SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name) if (!f.file) return error; audit_file(f.file); - error = mnt_want_write_file_path(f.file); + error = mnt_want_write_file(f.file); if (!error) { error = removexattr(f.file->f_path.dentry, name); - mnt_drop_write_file_path(f.file); + mnt_drop_write_file(f.file); } fdput(f); return error; |