© XXX Page 1 of 23 open flags 调研（已实现）© XXX Page 2 of 23 open接口原型 open flags flags定义 flags的含义 libfuse open open flags 在curvefs上的测试 open flags 实现方式 整体flags支持方案 具体flag的实现方案 O_TRUNC I/O模式类 O_DIRECT O_SYNC char *pathname, int flags); int open(const char *pathname, int flags, mode_t mode); int creat(const char *pathname, mode_t mode); int openat(int dirfd, const char *pathname, int flags); int openat(int dirfd dirfd, const char *pathname, int flags, mode_t mode); int openat2(int dirfd, const char *pathname, const struct open_how *how, size_t size); open系统调用会打开pathname指定的文件（如果不存在，如果携带O_CREAT flag则会创建），返回一个文

and the state DB was populated. The syntax for query is as follows: # be sure to set the -C and -n flags appropriately peer chaincode query -C $CHANNEL_NAME -n mycc -c '{"Args": ["query","a"]}' Invoke block and update the state DB. The syntax for invoke is as follows: # be sure to set the -C and -n flags appropriately peer chaincode invoke -o orderer.example.com:7050 --tls --cafile /opt/gopath/src/github query against a should reveal 90. The syntax for query is as follows. # be sure to set the -C and -n flags appropriately peer chaincode query -C $CHANNEL_NAME -n mycc -c '{"Args": ["query","a"]}' We should

and the state DB was populated. The syntax for query is as follows: # be sure to set the -C and -n flags appropriately peer chaincode query -C $CHANNEL_NAME -n mycc -c '{"Args":["query","a"]}' Invoke block and update the state DB. The syntax for invoke is as follows: # be sure to set the -C and -n flags appropriately peer chaincode invoke -o orderer.example.com:7050 --tls --cafile /opt/gopath/src/ query against a should reveal 90. The syntax for query is as follows. # be sure to set the -C and -n flags appropriately peer chaincode query -C $CHANNEL_NAME -n mycc -c '{"Args":["query","a"]}' We should

C code representation of the standard header is: struct pag { SCHAR pag_type; UCHAR pag_flags; USHORT pag_checksum; ULONG pag_generation; ULONG pag_scn; ULONG reserved; }; pag_type used. This page has a standard header like all others. pag_flags One byte, unsigned. Byte 0x01 on the page. This byte holds various flags for the page. pag_checksum Two bytes, unsigned. Bytes 0x02 SLONG hdr_oldest_active; SLONG hdr_next_transaction; USHORT hdr_sequence; USHORT hdr_flags; SLONG hdr_creation_date[2]; SLONG hdr_attachment_id; SLONG hdr_shadow_count; SSHORT

RebuildVSchemaGraph. It is automatically rebuilt when using vtctl ApplyVSchema (unless prevented by flags). Workflows involving the Topology Service The Topology Service is involved in many Vitess workflows command: # zk -server global_server1 ,global_server2 touch -p /vitess/global # Set the following flags to let Vitess use this global server: # -topo_implementation zk2 # -topo_global_server_address global_server1 servers http://global_server1,http://global_server2 in path /vitess/global: # Set the following flags to let Vitess use this global server, # and simplify the example below: # -topo_implementation etcd2

IFramebuffer::capabilities[] Capabilities of the framebuffer instance. For the meaning of individual capability flags see FramebufferCapabilities. 5.43.2 getVisibleRegion Note: This method is not supported in the web number (st_gen). 5.45.1.19 userFlags (read-only) unsigned long IFsObjInfo::userFlags User flags (st_flags). 5.46 IGuest The IGuest interface represents information about the operating system running IGuest::updateGuestAdditions( [in] wstring source, [in] wstring arguments[], [in] AdditionsUpdateFlag flags[]) source Path to the Guest Additions .ISO file to use for the update. arguments Optional command

IFramebuffer::capabilities[] Capabilities of the framebuffer instance. For the meaning of individual capability flags see FramebufferCapabilities. 5.35.2 getVisibleRegion Note: This method is not supported in the web object (st_uid). 5.37.1.18 userFlags (read-only) unsigned long IFsObjInfo::userFlags User flags (st_flags). 5.37.1.19 userName (read-only) wstring IFsObjInfo::userName The user name. 5.38 IGuest IGuest::updateGuestAdditions( [in] wstring source, [in] wstring arguments[], [in] AdditionsUpdateFlag flags[]) source Path to the Guest Additions .ISO file to use for the update. arguments Optional command

IFramebuffer::capabilities[] Capabilities of the framebuffer instance. For the meaning of individual capability flags see FramebufferCapabilities. 5.35.2 getVisibleRegion Note: This method is not supported in the web object (st_uid). 5.37.1.18 userFlags (read-only) unsigned long IFsObjInfo::userFlags User flags (st_flags). 5.37.1.19 userName (read-only) wstring IFsObjInfo::userName The user name. 5.38 IGuest IGuest::updateGuestAdditions( [in] wstring source, [in] wstring arguments[], [in] AdditionsUpdateFlag flags[]) source Path to the Guest Additions .ISO file to use for the update. arguments Optional command

IFramebuffer::capabilities[] Capabilities of the framebuffer instance. For the meaning of individual capability flags see FramebufferCapabilities. 5.43.2 getVisibleRegion Note: This method is not supported in the web object (st_uid). 5.45.1.18 userFlags (read-only) unsigned long IFsObjInfo::userFlags User flags (st_flags). 5.45.1.19 userName (read-only) wstring IFsObjInfo::userName The user name. 5.46 IGuest IGuest::updateGuestAdditions( [in] wstring source, [in] wstring arguments[], [in] AdditionsUpdateFlag flags[]) source Path to the Guest Additions .ISO file to use for the update. arguments Optional command

IFramebuffer::capabilities[] Capabilities of the framebuffer instance. For the meaning of individual capability flags see FramebufferCapabilities. 5.56.2 getVisibleRegion Note: This method is not supported in the web number (st_gen). 5.58.1.19 userFlags (read-only) unsigned long IFsObjInfo::userFlags User flags (st_flags). 5.59 IGraphicsAdapter The IGraphicsAdapter interface represents the graphics adapter of the IGuest::updateGuestAdditions( [in] wstring source, [in] wstring arguments[], [in] AdditionsUpdateFlag flags[]) source Path to the Guest Additions .ISO file to use for the update. arguments Optional command