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libfs: simple_follow_link() 

let "fast" symlinks store the pointer to the body into ->i_link and
use simple_follow_link for ->follow_link()

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-02 09:54:06 -04:00
parent a7a67e8a08
commit 61ba64fc07
3 changed files with 17 additions and 0 deletions
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1
fs/inode.c
View File

@ -152,6 +152,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
inode->i_pipe = NULL;
inode->i_bdev = NULL;
inode->i_cdev = NULL;
inode->i_link = NULL;
inode->i_rdev = 0;
inode->dirtied_when = 0;

13
fs/libfs.c
View File

@ -1093,3 +1093,16 @@ simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
return -EINVAL;
}
EXPORT_SYMBOL(simple_nosetlease);
void *simple_follow_link(struct dentry *dentry, struct nameidata *nd)
{
nd_set_link(nd, d_inode(dentry)->i_link);
return NULL;
}
EXPORT_SYMBOL(simple_follow_link);
const struct inode_operations simple_symlink_inode_operations = {
.follow_link = simple_follow_link,
.readlink = generic_readlink
};
EXPORT_SYMBOL(simple_symlink_inode_operations);

3
include/linux/fs.h
View File

@ -656,6 +656,7 @@ struct inode {
struct pipe_inode_info *i_pipe;
struct block_device *i_bdev;
struct cdev *i_cdev;
char *i_link;
};
__u32 i_generation;
@ -2721,6 +2722,8 @@ void __inode_sub_bytes(struct inode *inode, loff_t bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes);
loff_t inode_get_bytes(struct inode *inode);
void inode_set_bytes(struct inode *inode, loff_t bytes);
void *simple_follow_link(struct dentry *, struct nameidata *);
extern const struct inode_operations simple_symlink_inode_operations;
extern int iterate_dir(struct file *, struct dir_context *);