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The operation of inode in fscache is mainly concentrated in the data structure struct fscache_cookie_def. The specific data structure and its operations are as follows:

Static const struct fscache_cookie_def ceph_fscache_inode_object_def = {

.name = "CEPH.inode"

.type = FSCACHE_COOKIE_TYPE_DATAFILE

.get _ key = ceph_fscache_inode_get_key

.get _ attr = ceph_fscache_inode_get_attr

.get _ aux = ceph_fscache_inode_get_aux

.check _ aux = ceph_fscache_inode_check_aux

.now _ uncached = ceph_fscache_inode_now_uncached

}

Ceph_fscache_inode_get_key (void * cookie_netfs_data, void * buffer, uint16_t maxbuf) reads i_vino information from struct ceph_inode_info to buffer

| | _ _ from parameter cookie_netfs_data to struct ceph_inode_info data structure |

| | _ _ call memcpy () to copy the i_vino content in struct ceph_inode_info to buffer |

Ceph_fscache_inode_get_attr (void * cookie_netfs_data, uint64_t * size) reads the size of vfs_inode in struct ceph_inode_info

| | _ _ from parameter cookie_netfs_data to struct ceph_inode_info data structure |

| | _ _ call the i_size_read () function to read the size of the vfs_inode in struct ceph_inode_info and save it to size |

Ceph_fscache_inode_get_aux (void * cookie_netfs_data, void * buffer, uint16_t bufmax)

| | _ _ from parameter cookie_netfs_data to struct ceph_inode_info data structure |

| | _ _ initialize struct ceph_aux_inode information |

| | _ _ initialize struct ceph_aux_inode information from struct ceph_inode_info structure |

| | _ _ copy struct ceph_aux_inode information to buffer |

Ceph_fscache_inode_check_aux (void * cookie_netfs_data, void * data, uint16_t dlen)

| | _ _ from parameter cookie_netfs_data to struct ceph_inode_info data structure |

| | _ _ initialize struct ceph_aux_inode information from struct ceph_inode_info structure |

| | _ _ compare the data and initialized struct ceph_aux_inode information in the parameters |

Ceph_fscache_inode_now_uncached (void * cookie_netfs_data)

| | _ _ from parameter cookie_netfs_data to struct ceph_inode_info data structure |

| | _ _ call pagevec_init () function to initialize pvec |

| | _ _ call the pagevec_lookup () function to find all mapped physical memory pages in struct ceph_inode_ infovfs _ inode.i_mapping |

| | _ _ call ClearPageFsCache () function to clear the fscache of the physical memory page |

| | _ _ call pagevec_release () function to release pvec |

Ceph_fscache_register_inode_cookie (struct inode * inode)

| | _ _ get struct ceph_inode_info and struct ceph_fs_client information from parameter inode |

| | _ _ call the fscache_acquire_cookie () function to get the cookie value of accessing ceph fscache and save the cookie value to the fscache of struct ceph_inode_info |

Ceph_fscache_unregister_inode_cookie (struct ceph_inode_info * ci)

| | _ _ call the fscache_uncache_all_inode_pages () function to delete all physical memory pages occupied by inode from cache |

| | _ _ call fscache_relinquish_cookie () function to delete cookie |

Ceph_fscache_can_enable (void * data)

| | _ _ get the struct inode data structure from the parameter data |

| | _ _ calls the inode_is_open_for_write (inode) function and returns the non-value returned by the function |

Ceph_fscache_file_set_cookie (struct inode * inode, struct file * filp)

| | _ _ get the struct ceph_inode_info data structure from the parameter inode |

| | _ _ call the fscache_cookie_valid () function to check whether the fscache in struct ceph_inode_info is valid, and return it directly if it is invalid |

| | _ _ call the inode_is_open_for_write () function to check whether inode is open and writable |

| | _ _ call fscache_disable_cookie () function to disable cookie |

| | _ _ call fscache_uncache_all_inode_pages () function to delete all physical memory pages of inode in cache |

| | _ _ call the inode_is_open_for_write () function to check whether inode is not open and not writable |

| | _ _ call fscache_enable_cookie () function to enable cookie |

Ceph_fscache_register ()

| | _ _ call the fscache_register_netfs () function to register the fscache of ceph |

Ceph_fscache_unregister ()

| | _ _ call the fscache_unregister_netfs () function to log out the fscache of ceph |

Ceph_fscache_register_fs (struct ceph_fs_client * fs)

| | _ _ call the fscache_acquire_cookie () function to get the cookie value of accessing ceph fscache and save the cookie value to the fscache of struct ceph_fs_client |

Ceph_fscache_unregister_fs (struct ceph_fs_client * fsc)

| | _ _ call fscache_relinquish_cookie () function to release fsc- > fscache data structure |

Ceph_fscache_session_get_key (void * cookie_netfs_data, void * buffer, uint16_t maxbuf)

| | _ _ from parameter cookie_netfs_data to struct ceph_fs_client data structure |

| | _ _ call the memcpy () function to copy the client- > FSID value in the struct ceph_fs_client data structure to buffer |

Ceph_readpage_from_fscache (struct inode * inode, struct page * page)

| | _ _ get the struct ceph_inode_info data structure from the parameter inode |

| | _ _ call the fscache_read_or_alloc_page () function to read the contents of inode from fscache and write them to page |

Ceph_readpages_from_fscache (struct inode * inode, struct address_space * mapping, struct list_head * pages, unsigned * nr_pages)

| | _ _ get the struct ceph_inode_info data structure from the parameter inode |

| | _ _ call the fscache_read_or_alloc_pages () function to read the data in mapping from fscahe and write it to pages |

Ceph_readpage_to_fscache (struct inode * inode, struct page * page)

| | _ _ get the struct ceph_inode_info data structure from the parameter inode |

| | _ _ call the fscache_write_page () function to synchronize the data from the physical memory page page to fscache |

Ceph_invalidate_fscache_page (struct inode * inode, struct page * page)

| | _ _ get the struct ceph_inode_info data structure from the parameter inode |

| | _ _ call the fscache_wait_on_page_write () function to wait for the page write to be completed |

| | _ _ call the fscache_uncache_page () function to delete the contents of page from the fscache in struct ceph_inode_info |

Ceph_fscache_revalidate_cookie (struct ceph_inode_info * ci)

| | _ _ call the cache_valid () function to check whether the fscache specified by ci is valid, if not |

| | _ _ call the fscache_check_consistency () function to verify the consistency of ci- > fscache, if not |

| | _ _ call fscache_invalidate () function to set ci- > fscache is invalid |

| | _ _ set ci- > iFeSCACHER genetics-> i_rdcache_gen |

The above is all the contents of this article "cephfs linux kernel client's operation code for fscache". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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