diff options
Diffstat (limited to 'libglusterfs')
-rw-r--r-- | libglusterfs/src/inode.c | 110 | ||||
-rw-r--r-- | libglusterfs/src/inode.h | 17 |
2 files changed, 127 insertions, 0 deletions
diff --git a/libglusterfs/src/inode.c b/libglusterfs/src/inode.c index 3a6464ac5e1..6f3bc535a14 100644 --- a/libglusterfs/src/inode.c +++ b/libglusterfs/src/inode.c @@ -2569,3 +2569,113 @@ inode_ctx_size (inode_t *inode) out: return size; } + +static void +inode_parent_null_check(inode_t **parent, inode_t *inode, char **component) +{ + GF_VALIDATE_OR_GOTO ("inode", inode, out); + GF_VALIDATE_OR_GOTO ("inode", (*component), out); + + if (!(*parent) && __is_root_gfid (inode->gfid)) { + *parent = inode_ref (inode); + *component = "/"; + } +out: + return; +} + +/* + * This function changes component name and parent inode + * if the component name is either "." or ".." + * + * @Paramas: + * Parent : Parent inode of current dentry + * component : component name that we need to test + * dentry_name : Address for memory if need to change component. + * The caller has to preallocate this memory with + * PATH_MAX as the size. + * + * We return the updated parent inode and component in the + * respective structures. + * + * Basic Idea of the function: + * + * Example 1 : + * Path /out_dir/dir/in_dir/. + * In put values : + * parent = in_dir + * component : "." + * + * Out put values: + * parent : dir + * component : "in_dir" + * + * Example 2 : + * Path /out_dir/dir/in_dir/.. + * In put values : + * parent = in_dir + * component : ".." + * + * Out put values: + * parent : output_dir + * component : "dir" + */ +void +glusterfs_normalize_dentry (inode_t **parent, char **component, + char *dentry_name) +{ + inode_t *temp_inode = NULL; + dentry_t *dentry = NULL; + + GF_VALIDATE_OR_GOTO ("inode", (*parent), out); + GF_VALIDATE_OR_GOTO ("inode", (*component), out); + GF_VALIDATE_OR_GOTO ("inode", (dentry_name), out); + + /* After this point, there should not be "." or ".." + * in the path. Dot and double dots are replaced with + * appropriate base name and parent inode. + */ + + /* During the resolving, if it goes beyond the mount point + * we do lookup on the mount itself like "/.. " will be + * converted as "/" + */ + if (strcmp (*component, ".") == 0) { + temp_inode = *parent; + *parent = inode_parent (*parent, 0, 0); + inode_parent_null_check (parent, temp_inode, component); + pthread_mutex_lock (&temp_inode->table->lock); + { + dentry = __dentry_search_arbit (temp_inode); + if (dentry) { + snprintf (dentry_name, PATH_MAX, "%s", + dentry->name); + *component = dentry_name; + } + } + pthread_mutex_unlock (&temp_inode->table->lock); + inode_unref (temp_inode); + } else if (strcmp (*component, "..") == 0) { + temp_inode = *parent; + *parent = inode_parent (*parent, 0, 0); + inode_parent_null_check (parent, temp_inode, component); + inode_unref (temp_inode); + + temp_inode = *parent; + *parent = inode_parent (*parent, 0, 0); + inode_parent_null_check (parent, temp_inode, component); + pthread_mutex_lock (&temp_inode->table->lock); + { + dentry = __dentry_search_arbit (temp_inode); + if (dentry) { + snprintf (dentry_name, PATH_MAX, "%s", + dentry->name); + *component = dentry_name; + } + } + pthread_mutex_unlock (&temp_inode->table->lock); + inode_unref (temp_inode); + } +out: + return; +} diff --git a/libglusterfs/src/inode.h b/libglusterfs/src/inode.h index cdc2095a0e8..253196378a8 100644 --- a/libglusterfs/src/inode.h +++ b/libglusterfs/src/inode.h @@ -286,4 +286,21 @@ inode_has_dentry (inode_t *inode); size_t inode_ctx_size (inode_t *inode); +/* + * This function is used to change the dentry from a path + * if it contains any "." or ".." . + * + * It replaces "." and ".." to proper bname after resolving + * and will change the component accordingly. + * + * This fucntion also replaces the parent inode based on the + * bname. + * + * We should give a allocated memory as a third argument to store + * the component in case if we are modifying it. + */ + +void +glusterfs_normalize_dentry (inode_t **parent, char **component, + char *dentry_name); #endif /* _INODE_H */ |