xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vfs: create a generic checking and prep function for FS_IOC_SETFLAGS

Browse Source 
Create a generic function to check incoming FS_IOC_SETFLAGS flag values
and later prepare the inode for updates so that we can standardize the
implementations that follow ext4's flag values.

Note that the efivarfs implementation no longer fails a no-op SETFLAGS
without CAP_LINUX_IMMUTABLE since that's the behavior in ext*.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Darrick J. Wong
2019-07-01 08:25:34 -07:00
parent d1fdb6d8f6
commit 5aca284210
14 changed files with 144 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
fs/efivarfs/file.c
View File

@@ -110,16 +110,22 @@ out_free:
return size;
}
static int
efivarfs_ioc_getxflags(struct file *file, void __user *arg)
static inline unsigned int efivarfs_getflags(struct inode *inode)
{
struct inode *inode = file->f_mapping->host;
unsigned int i_flags;
unsigned int flags = 0;
i_flags = inode->i_flags;
if (i_flags & S_IMMUTABLE)
flags |= FS_IMMUTABLE_FL;
return flags;
}
static int
efivarfs_ioc_getxflags(struct file *file, void __user *arg)
{
struct inode *inode = file->f_mapping->host;
unsigned int flags = efivarfs_getflags(inode);
if (copy_to_user(arg, &flags, sizeof(flags)))
return -EFAULT;
@@ -132,6 +138,7 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg)
struct inode *inode = file->f_mapping->host;
unsigned int flags;
unsigned int i_flags = 0;
unsigned int oldflags = efivarfs_getflags(inode);
int error;
if (!inode_owner_or_capable(inode))
@@ -143,9 +150,6 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg)
if (flags & ~FS_IMMUTABLE_FL)
return -EOPNOTSUPP;
if (!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
if (flags & FS_IMMUTABLE_FL)
i_flags |= S_IMMUTABLE;
@@ -155,12 +159,16 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg)
return error;
inode_lock(inode);
error = vfs_ioc_setflags_prepare(inode, oldflags, flags);
if (error)
goto out;
inode_set_flags(inode, i_flags, S_IMMUTABLE);
out:
inode_unlock(inode);
mnt_drop_write_file(file);
return 0;
return error;
}
static long