When writing into preallocated space, many filesystems also On filesystems using copy-on-write semantics (e.g.,ītrfs) an overwrite of existing allocated blocks is impossible. There is no user interface to know if a write is purely an Performing overwrites of already-instantiated disk blocks, thereĪre no guarantees that the data will be available after a crash. Therefore, unless the application is strictly None of these operations writes out theįile's metadata. This system call is extremely dangerous and should not be used in Specifying flags as 0 is permitted, as a no-op. Wait upon write-out of all pages in the range after That even this may block if you attempt to write more than Range which are not presently submitted write-out. ![]() Initiate write-out of all dirty pages in the specified That have already been submitted to the device driver for Wait upon write-out of all pages in the specified range The flags bit-mask argument can include any of the following (offset+nbytes-1) is rounded up to a page boundary. The system page size: offset is rounded down to a page boundary ![]() Nbytes specifies the length of the range to be synchronized, inīytes if nbytes is zero, then all bytes from offset through to Offset is the starting byte of the file range to be synchronized. Open file referred to by the file descriptor fd with disk. #include int sync_file_range(int fd, off64_t offset, off64_t nbytes, unsigned int flags ) DESCRIPTION top sync_file_range() permits fine control when synchronizing the SYNOPSIS top #define _GNU_SOURCE /* See feature_test_macros(7) */ Sync_file_range - sync a file segment with disk Sync_file_range(2) System Calls Manual sync_file_range(2) NAME top
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