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    Subject[PATCH 03/13] vfs: export __inode_permission() to modules
    Date
    From: Miklos Szeredi <mszeredi@suse.cz>

    We need to be able to check inode permissions (but not filesystem implied
    permissions) for stackable filesystems. Expose this interface for overlayfs.

    Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
    ---
    fs/internal.h | 1 -
    fs/namei.c | 1 +
    include/linux/fs.h | 1 +
    3 files changed, 2 insertions(+), 1 deletion(-)

    diff --git a/fs/internal.h b/fs/internal.h
    index 873cdf544d54..dd41b12c13f1 100644
    --- a/fs/internal.h
    +++ b/fs/internal.h
    @@ -42,7 +42,6 @@ extern void __init chrdev_init(void);
    /*
    * namei.c
    */
    -extern int __inode_permission(struct inode *, int);
    extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
    extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
    const char *, unsigned int, struct path *);
    diff --git a/fs/namei.c b/fs/namei.c
    index a7cf0fb1f638..fe615561c90e 100644
    --- a/fs/namei.c
    +++ b/fs/namei.c
    @@ -414,6 +414,7 @@ int __inode_permission(struct inode *inode, int mask)

    return security_inode_permission(inode, mask);
    }
    +EXPORT_SYMBOL(__inode_permission);

    /**
    * sb_permission - Check superblock-level permissions
    diff --git a/include/linux/fs.h b/include/linux/fs.h
    index 90463dfd77d1..0ca904f5cd1c 100644
    --- a/include/linux/fs.h
    +++ b/include/linux/fs.h
    @@ -2233,6 +2233,7 @@ extern sector_t bmap(struct inode *, sector_t);
    #endif
    extern int notify_change(struct dentry *, struct iattr *, struct inode **);
    extern int inode_permission(struct inode *, int);
    +extern int __inode_permission(struct inode *, int);
    extern int generic_permission(struct inode *, int);

    static inline bool execute_ok(struct inode *inode)
    --
    1.8.1.4


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