dynamic_fs.go: reflow text.
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@ -17,20 +17,23 @@ import (
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"github.com/jacobsa/timeutil"
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)
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// Create a file system that contains 2 files (`age` and `weekday`) and no directories. Every time
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// the `age` file is opened, its contents are refreshed to show the number of seconds elapsed since
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// the file system was created (as opposed to mounted). Every time the `weekday` file is opened, its
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// contents are refreshed to reflect the current weekday.
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// Create a file system that contains 2 files (`age` and `weekday`) and no
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// directories. Every time the `age` file is opened, its contents are refreshed
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// to show the number of seconds elapsed since the file system was created (as
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// opposed to mounted). Every time the `weekday` file is opened, its contents
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// are refreshed to reflect the current weekday.
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//
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// The contents of both of these files is updated within the filesystem itself, i.e., these changes
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// do not go through the kernel. Additionally, file access times are not updated and file size is
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// not known in advance and is set to 0. This simulates a filesystem that is backed by a dynamic
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// data source where file metadata is not necessarily known before the file is read. For example,
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// a filesystem backed by an expensive RPC or by a stream that's generated on the fly might not
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// know data size ahead of time.
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// The contents of both of these files is updated within the filesystem itself,
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// i.e., these changes do not go through the kernel. Additionally, file access
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// times are not updated and file size is not known in advance and is set to 0.
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// This simulates a filesystem that is backed by a dynamic data source where
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// file metadata is not necessarily known before the file is read. For example,
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// a filesystem backed by an expensive RPC or by a stream that's generated on
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// the fly might not know data size ahead of time.
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//
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// This implementation depends on direct IO in fuse. Without it, all read operations are suppressed
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// because the kernel detects that they read beyond the end of the files.
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// This implementation depends on direct IO in fuse. Without it, all read
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// operations are suppressed because the kernel detects that they read beyond
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// the end of the files.
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func NewDynamicFS(clock timeutil.Clock) (server fuse.Server, err error) {
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createTime := clock.Now()
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fs := &dynamicFS{
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