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ovl: use a private non-persistent ino pool 

There is no reason to deplete the system's global get_next_ino() pool for
overlay non-persistent inode numbers and there is no reason at all to
allocate non-persistent inode numbers for non-directories.

For non-directories, it is much better to leave i_ino the same as real
i_ino, to be consistent with st_ino/d_ino.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2020-02-21 16:34:43 +02:00 committed by Miklos Szeredi
parent 83552eacdf
commit 4d314f7859
3 changed files with 15 additions and 3 deletions
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15
fs/overlayfs/inode.c
View File

@ -561,6 +561,15 @@ static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode)
#endif
}
static void ovl_next_ino(struct inode *inode)
{
struct ovl_fs *ofs = inode->i_sb->s_fs_info;
inode->i_ino = atomic_long_inc_return(&ofs->last_ino);
if (unlikely(!inode->i_ino))
inode->i_ino = atomic_long_inc_return(&ofs->last_ino);
}
static void ovl_map_ino(struct inode *inode, unsigned long ino, int fsid)
{
int xinobits = ovl_xino_bits(inode->i_sb);
@ -572,12 +581,12 @@ static void ovl_map_ino(struct inode *inode, unsigned long ino, int fsid)
* consistent with d_ino and st_ino values. An i_ino value inconsistent
* with d_ino also causes nfsd readdirplus to fail.
*/
inode->i_ino = ino;
if (ovl_same_dev(inode->i_sb)) {
inode->i_ino = ino;
if (xinobits && fsid && !(ino >> (64 - xinobits)))
inode->i_ino |= (unsigned long)fsid << (64 - xinobits);
} else {
inode->i_ino = get_next_ino();
} else if (S_ISDIR(inode->i_mode)) {
ovl_next_ino(inode);
}
}

2
fs/overlayfs/ovl_entry.h
View File

@ -75,6 +75,8 @@ struct ovl_fs {
struct inode *indexdir_trap;
/* -1: disabled, 0: same fs, 1..32: number of unused ino bits */
int xino_mode;
/* For allocation of non-persistent inode numbers */
atomic_long_t last_ino;
};
static inline struct ovl_fs *OVL_FS(struct super_block *sb)

1
fs/overlayfs/super.c
View File

@ -1736,6 +1736,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_stack_depth = 0;
sb->s_maxbytes = MAX_LFS_FILESIZE;
atomic_long_set(&ofs->last_ino, 1);
/* Assume underlaying fs uses 32bit inodes unless proven otherwise */
if (ofs->config.xino != OVL_XINO_OFF) {
ofs->xino_mode = BITS_PER_LONG - 32;