diff options
Diffstat (limited to 'fs/overlayfs/util.c')
| -rw-r--r-- | fs/overlayfs/util.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index a146c7ab8d8e..4ff58f92100d 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -83,6 +83,34 @@ bool ovl_verify_lower(struct super_block *sb) return ofs->config.nfs_export && ofs->config.index; } +struct ovl_path *ovl_stack_alloc(unsigned int n) +{ + return kcalloc(n, sizeof(struct ovl_path), GFP_KERNEL); +} + +void ovl_stack_cpy(struct ovl_path *dst, struct ovl_path *src, unsigned int n) +{ + unsigned int i; + + memcpy(dst, src, sizeof(struct ovl_path) * n); + for (i = 0; i < n; i++) + dget(src[i].dentry); +} + +void ovl_stack_put(struct ovl_path *stack, unsigned int n) +{ + unsigned int i; + + for (i = 0; stack && i < n; i++) + dput(stack[i].dentry); +} + +void ovl_stack_free(struct ovl_path *stack, unsigned int n) +{ + ovl_stack_put(stack, n); + kfree(stack); +} + struct ovl_entry *ovl_alloc_entry(unsigned int numlower) { size_t size = offsetof(struct ovl_entry, __lowerstack[numlower]); @@ -94,6 +122,12 @@ struct ovl_entry *ovl_alloc_entry(unsigned int numlower) return oe; } +void ovl_free_entry(struct ovl_entry *oe) +{ + ovl_stack_put(ovl_lowerstack(oe), ovl_numlower(oe)); + kfree(oe); +} + #define OVL_D_REVALIDATE (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE) bool ovl_dentry_remote(struct dentry *dentry) |