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authorChristian Brauner <christian.brauner@ubuntu.com>2021-01-21 14:19:22 +0100
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 14:27:16 +0100
commit02f92b3868a1b34ab98464e76b0e4e060474ba10 (patch)
tree355710b868f8a26f8fd5ba413938f92f8a24b68a /mm
parente6c9a71451560edba343cbcbd500bea0a188f0d1 (diff)
fs: add file and path permissions helpers
Add two simple helpers to check permissions on a file and path respectively and convert over some callers. It simplifies quite a few codepaths and also reduces the churn in later patches quite a bit. Christoph also correctly points out that this makes codepaths (e.g. ioctls) way easier to follow that would otherwise have to do more complex argument passing than necessary. Link: https://lore.kernel.org/r/20210121131959.646623-4-christian.brauner@ubuntu.com Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Suggested-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jamorris@linux.microsoft.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/madvise.c2
-rw-r--r--mm/memcontrol.c2
-rw-r--r--mm/mincore.c2
3 files changed, 3 insertions, 3 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index 6a660858784b..175c5582d8a9 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -540,7 +540,7 @@ static inline bool can_do_pageout(struct vm_area_struct *vma)
* opens a side channel.
*/
return inode_owner_or_capable(file_inode(vma->vm_file)) ||
- inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0;
+ file_permission(vma->vm_file, MAY_WRITE) == 0;
}
static long madvise_pageout(struct vm_area_struct *vma,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 605f671203ef..cf9076f58582 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4899,7 +4899,7 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
/* the process need read permission on control file */
/* AV: shouldn't we check that it's been opened for read instead? */
- ret = inode_permission(file_inode(cfile.file), MAY_READ);
+ ret = file_permission(cfile.file, MAY_READ);
if (ret < 0)
goto out_put_cfile;
diff --git a/mm/mincore.c b/mm/mincore.c
index 02db1a834021..7bdb4673f776 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -167,7 +167,7 @@ static inline bool can_do_mincore(struct vm_area_struct *vma)
* mappings, which opens a side channel.
*/
return inode_owner_or_capable(file_inode(vma->vm_file)) ||
- inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0;
+ file_permission(vma->vm_file, MAY_WRITE) == 0;
}
static const struct mm_walk_ops mincore_walk_ops = {