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Cephfs kernel client's inode operation for dir

Const struct inode_operations ceph_dir_iops = {

.lookup = ceph_lookup

.clients = ceph_permission

.getattr = ceph_getattr

.setattr = ceph_setattr

.setxattr = generic_setxattr

.getxattr = generic_getxattr

.listxattr = ceph_listxattr

.removexattr = generic_removexattr

.get _ acl = ceph_get_acl

.set _ acl = ceph_set_acl

.mknod = ceph_mknod

.symlink = ceph_symlink

.mkdir = ceph_mkdir

.link = ceph_link

.unlink = ceph_unlink

.rmdir = ceph_unlink

.rename = ceph_rename

.create = ceph_create

.atomic _ open = ceph_atomic_open

}

This function is called when ceph_lookup (struct inode * dir, struct dentry * dentry, unsigned int flags) looks up a directory

| | _ _ call the ceph_init_dentry () function to initialize the dentry data structure, including the operation set ceph_dentry_ops for dentry |

| | _ _ sets the opcode op=CEPH_MDS_OP_LOOKUPSNAP or CEPH_MDS_OP_LOOKUP |

| | _ _ call the ceph_mdsc_create_request () function to create a mds request |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

Ceph_permission (struct inode * inode, int mask) checks whether dir has the access rights specified by mask

| | _ _ call the ceph_do_getattr () function to get the permissions corresponding to CEPH_CAP_AUTH_SHARED from the local cache or mds cluster |

| | _ _ call the generic_permission () function for general permission checking |

This function is called when ceph_setattr (struct dentry * dentry, struct iattr * attr) sets file properties.

| | _ _ call _ _ ceph_setattr () function |

| | _ _ call ceph_mdsc_create_request () function to create mds cluster request |

| | _ _ specific items in the request data structure based on the content of setting specific attributes, such as ATTR_UID/ATTR_GID/ATTR_MODE/ATTR_ATIME/ATTR_MTIME/ATTR_SIZE/ATTR_CTIME |

| | _ _ call the ceph_mdsc_do_reqeust () function to send the request to the mds process synchronously |

This function is called when ceph_getattr (struct vfsmount * mnt, struct dentry * dentry, struct kstat * stat) gets file attributes.

| | _ _ call the ceph_do_getattr (CEPH_STAT_CAP_INODE_ALL) function to read all attribute values of inode from the mds cluster |

| | _ _ call the generic_fillattr () function to set common attribute values to stat |

| | _ _ set cephfs-related attribute values to stat |

This function is called when ceph_listxattr (struct dentry * dentry, char * names, size_t size) lists the xattrs of inode

| | _ _ if version of xattrs is 0 |

| | _ _ call ceph_do_getattr (CEPH_STAT_CAP_XATTR) function to read xattr information from mds cluster |

| | _ _ call _ _ build_xattrs () function to create xattr attribute |

| | _ _ call _ _ copy_xattr_names () function to copy all the name information of xattr attribute to the names array |

Ceph_get_acl (struct inode * inode, int type) calls this function when reading the acl information of inode.

| | _ _ call _ _ ceph_getxattr () function to read the attribute values of XATTR_NAME_POSIX_ACL_ACCESS or XATTR_NAME_POSIX_ACL_DEFUALT from the mds cluster |

| | _ _ call the posix_acl_from_xattr () function to read acl information into the struct posix_acl data structure in memory |

| | _ _ call the ceph_set_cache_acl () function to write the struct posix_acl data structure in memory to cache |

This function is called when ceph_set_acl (struct inode * inode, struct posix_acl * acl, int type) sets the acl information of inode.

| | _ _ call posix_acl_xattr_size () function to get the size of xattr |

| | _ _ call posix_acl_to_xattr () function to convert acl to xattr format |

| | _ _ call _ _ ceph_setxattr () function to write xattr data converted by acl to mds cluster |

| | _ _ call ceph_set_cached_acl () function to write new acl information to cache |

Ceph_mknod (struct inode * dir, sturct dentry * dentry, umode_t mode, dev_t rdev)

| | _ _ call the ceph_pre_init_acls () function to get the mode and struct ceph_acls_info data structure content |

| | _ _ call ceph_mdsc_create_request (CEPH_MDS_OP_MKMOD) function to create a mds request |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

Ceph_symlink (struct inode * dir, struct dentry * dentry, const char * dest)

| | _ _ call ceph_mdsc_create_request (CEPH_MDS_OP_SYMLINK) function to create a mds request |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

Ceph_mkdir (struct inode * dir, struct dentry * dentry, umode_t mode)

| | _ _ get the opcode op=CEPH_MDS_OP_MKDIR or CEPH_MDS_OP_MKSNAP |

| | _ _ call ceph_mdsc_create_request (op) function to create a mds request |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

| | _ _ call ceph_init_inode_acls () function to set the default acls of inode corresponding to dentry |

Ceph_link (struct dentry * old_dentry, struct inode * dir, struct dentry * dentry)

| | _ _ call ceph_mdsc_create_request (CEPH_MDS_OP_LINK) function to create a mds request |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

Ceph_unlink (struct inode * dir, struct dentry * dentry)

| | _ _ get the opcode op=CEPH_MDS_OP_RMSNAP or CEPH_MDS_OP_RMDIR or CEPH_MDS_OP_RMLINK |

| | _ _ call ceph_mdsc_create_request (op) function to create a mds request |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

Ceph_rename (struct inode * old_inode, struct dentry * old_dentry, struct inode * new_inode, struct dentry * new_dentry)

| | _ _ get the opcode op=CEPH_MDS_OP_RENAME or CEPH_MDS_OP_RENAMESNAP |

| | _ _ call ceph_mdsc_create_request (op) function to create a mds request |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

| | _ _ call ceph_dir_clear_complete () function to increase the reference count of release |

| | _ _ call d_move () function to update dentry in memory |

| | _ _ call the ceph_invalidate_dentry_lease () function to refresh the time and lease_shared_gen fields of dentry |

Ceph_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool exel)

| | _ _ call the ceph_mknod () function to complete the creation of the directory |

Ceph_atomic_open (struct inode * dir, struct dentry * dentry, struct file * file, unsigned flags, umode_t mode, int * opened) lookup+open is implemented in a request

| | _ _ call the ceph_init_dentry () function to initialize the dentry data structure, including the operation set ceph_dentry_ops for dentry |

| | _ _ call the prepare_open_request () function to create a mds request whose opcode is CEPH_MDS_OP_CREATE or CEPH_MDS_OP_OPEN |

| | _ _ call the ceph_mdsc_do_request () function to send the request to the mds process synchronously |

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