filemap_fdatawait – wait for all under-writeback pages to complete Synopsis int filemap_fdatawait(struct address_space *mapping); Arguments mapping address space structure to wait for Description Walk the list of under-writeback pages of the given address space and wait for all of them. Check error status of the address space and return it. Since the error status of…
filemap_fault – read in file data for page fault handling Synopsis int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); Arguments vma vma in which the fault was taken vmf struct vm_fault containing details of the fault Description filemap_fault is invoked via the vma operations vector for a mapped memory region to read in file data during…
file_update_time – update mtime and ctime time Synopsis int file_update_time(struct file *file); Arguments file file accessed Description Update the mtime and ctime members of an inode and mark the inode for writeback. Note that this function is meant exclusively for usage in the file write path of filesystems, and filesystems may choose to explicitly ignore…
ffz – find first zero bit in word Synopsis unsigned long ffz(unsigned long word); Arguments word The word to search Description Undefined if no zero exists, so code should check against ~0UL first. Copyright
ffs – find first set bit in word Synopsis int ffs(int x); Arguments x the word to search Description This is defined the same way as the libc and compiler builtin ffs routines, therefore differs in spirit from the other bitops. ffs(value) returns 0 if value is 0 or the position of the first set…
fcntl_setlease – sets a lease on an open file Synopsis int fcntl_setlease(unsigned int fd, struct file *filp, long arg); Arguments fd open file descriptor filp file pointer arg type of lease to obtain Description Call this fcntl to establish a lease on the file. Note that you also need to call F_SETSIG to receive a…
fcntl_getlease – Enquire what lease is currently active Synopsis int fcntl_getlease(struct file *filp); Arguments filp the file Description The value returned by this function will be one of (if no lease break is pending): F_RDLCK to indicate a shared lease is held. F_WRLCK to indicate an exclusive lease is held. F_UNLCK to indicate no lease…
fc_vport_terminate – Admin App or LLDD requests termination of a vport Synopsis int fc_vport_terminate(struct fc_vport *vport); Arguments vport fc_vport to be terminated Description Calls the LLDD vport_delete function, then deallocates and removes the vport from the shost and object tree. Notes This routine assumes no locks are held on entry. Authors James Bottomley <James.Bottomley [at]…
fc_vport_create – Admin App or LLDD requests creation of a vport Synopsis struct fc_vport *fc_vport_create(struct Scsi_Host *shost, int channel, struct fc_vport_identifiers *ids); Arguments shost scsi host the virtual port is connected to. channel channel on shost port connected to. ids The world wide names, FC4 port roles, etc for the virtual port. Notes This routine…
fc_remove_host – called to terminate any fc_transport-related elements for a scsi host. Synopsis void fc_remove_host(struct Scsi_Host *shost); Arguments shost Which Scsi_Host Description This routine is expected to be called immediately preceding the a driver’s call to scsi_remove_host. WARNING: A driver utilizing the fc_transport, which fails to call this routine prior to scsi_remove_host, will leave dangling…
fc_remote_port_rolechg – notifies the fc transport that the roles on a remote may have changed. Synopsis void fc_remote_port_rolechg(struct fc_rport *rport, u32 roles); Arguments rport The remote port that changed. roles New roles for this port. Description The LLDD calls this routine to notify the transport that the roles on a remote port may have changed….
fc_remote_port_delete – notifies the fc transport that a remote port is no longer in existence. Synopsis void fc_remote_port_delete(struct fc_rport *rport); Arguments rport The remote port that no longer exists Description The LLDD calls this routine to notify the transport that a remote port is no longer part of the topology. Note: Although a port may…
fc_remote_port_add – notify fc transport of the existence of a remote FC port. Synopsis struct fc_rport *fc_remote_port_add(struct Scsi_Host *shost, int channel, struct fc_rport_identifiers *ids); Arguments shost scsi host the remote port is connected to. channel Channel on shost port connected to. ids The world wide names, fc address, and FC4 port roles for the remote…
fc_host_post_vendor_event – called to post a vendor unique event on an fc_host Synopsis void fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number, u32 data_len, char *data_buf, u64 vendor_id); Arguments shost host the event occurred on event_number fc event number obtained from get_fc_event_number data_len amount, in bytes, of vendor unique data data_buf pointer to vendor unique data vendor_id Vendor…
fc_host_post_event – called to post an even on an fc_host. Synopsis void fc_host_post_event(struct Scsi_Host *shost, u32 event_number, enum fc_host_event_code event_code, u32 event_data); Arguments shost host the event occurred on event_number fc event number obtained from get_fc_event_number event_code fc_host event being posted event_data 32bits of data for the event being posted Notes This routine assumes no…
fc_get_event_number – Obtain the next sequential FC event number Synopsis u32 fc_get_event_number(void); Arguments void no arguments Notes We could have inlined this, but it would have required fc_event_seq to be exposed. For now, live with the subroutine call. Atomic used to avoid lock/unlock… Authors James Bottomley <James.Bottomley [at] hansenpartnership.com> Author. Rob Landley <rob [at] landley.net>…
fc_block_scsi_eh – Block SCSI eh thread for blocked fc_rport Synopsis int fc_block_scsi_eh(struct scsi_cmnd *cmnd); Arguments cmnd SCSI command that scsi_eh is trying to recover Description This routine can be called from a FC LLD scsi_eh callback. It blocks the scsi_eh thread until the fc_rport leaves the FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is necessary to…
fault_in_user_writeable – Fault in user address and verify RW access Synopsis int fault_in_user_writeable(u32 __user *uaddr); Arguments uaddr pointer to faulting user space address Description Slow path to fixup the fault we just took in the atomic write access to uaddr. We have no generic implementation of a non-destructive write to the user address. We know…
eventfd_signal – Adds n to the eventfd counter. Synopsis __u64 eventfd_signal(struct eventfd_ctx * ctx, __u64 n); Arguments ctx [in] Pointer to the eventfd context. n [in] Value of the counter to be added to the eventfd internal counter. The value cannot be negative. Description This function is supposed to be called by the kernel in paths that do…
eventfd_fget – Acquire a reference of an eventfd file descriptor. Synopsis struct file *eventfd_fget(int fd); Arguments fd [in] Eventfd file descriptor. Description Returns a pointer to the eventfd file structure in case of success, or the following error pointer: -EBADF : Invalid fd file descriptor. -EINVAL : The fd file descriptor is not an eventfd…