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29 .Dd September 14, 2021
35 .Nd flush filesystem buffers for a file
40 .Fn VOP_FDATASYNC "struct vnode *vp" "int waitfor" "int flags"
42 .Fn VOP_FSYNC "struct vnode *vp" "int waitfor" "int flags"
44 This call flushes any dirty filesystem buffers for the file.
45 It is used to implement the
52 .Bl -tag -width waitfor
54 the vnode of the file.
56 whether the function should do data, meta-data updates or be full-synchronous.
58 are additional flags to be passed to the filesystem specific
65 can use the following flags:
66 .Bl -tag -width ".Dv MNT_NOWAIT"
68 is for an asynchronous data pass and a meta-data pass as well.
70 means a limited amount of data from dirty buffers and a full meta-data synchronization pass.
74 try to do a full synchronization pass.
75 That is, a meta-data pass and multiple data passes.
80 is to specify additional flags passed to the filesystem specific
83 The only supported flag at the moment is
85 which indicates the file synchronization was requested from userland.
88 is similar, but it does not require that all of the file's metadata be flushed.
89 It only requires that the file's data be recoverable after a crash.
90 That implies that the data itself must be flushed to disk, as well as some
91 metadata such as the file's size but not necessarily its attributes.
93 should always wait for I/O to complete, as if called with
99 Zero is returned if the call is successful, otherwise an appropriate
100 error code is returned.
104 The filesystem is full.
112 This man page was written by