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| author |   Miklos Szeredi <mszeredi@redhat.com> | 2016-12-09 16:45:04 +0100 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2016-12-09 16:45:04 +0100 |
| commit | fd4a0edf2a3d781c6ae07d2810776ce22302ee1c (patch) | |
| tree | 4ccfd06bc5705bc2903667043e4f9fdadb568d1b /fs/namei.c | |
| parent | proc/self: use generic_readlink (diff) | |
| download | wireguard-linux-fd4a0edf2a3d781c6ae07d2810776ce22302ee1c.tar.xz wireguard-linux-fd4a0edf2a3d781c6ae07d2810776ce22302ee1c.zip | |
vfs: replace calling i_op->readlink with vfs_readlink()
Also check d_is_symlink() in callers instead of inode->i_op->readlink
because following patches will allow NULL ->readlink for symlinks.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c index 5b4eed221530..12a4159de72a 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -4669,6 +4669,27 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen) EXPORT_SYMBOL(generic_readlink); /** + * vfs_readlink - copy symlink body into userspace buffer + * @dentry: dentry on which to get symbolic link + * @buffer: user memory pointer + * @buflen: size of buffer + * + * Does not touch atime. That's up to the caller if necessary + * + * Does not call security hook. + */ +int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen) +{ + struct inode *inode = d_inode(dentry); + + if (!inode->i_op->readlink) + return -EINVAL; + + return inode->i_op->readlink(dentry, buffer, buflen); +} +EXPORT_SYMBOL(vfs_readlink); + +/** * vfs_get_link - get symlink body * @dentry: dentry on which to get symbolic link * @done: caller needs to free returned data with this |