linux: add UMA stat for the file system where the prefs are stored

linux: add UMA stat for the file system where the prefs are stored

I'd like to see how common it is to use a network file system for
your home directory.  This would help evaluate how important it is
to support these users.

See also:
  http://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/b43d2905f079fa1c

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=56786

[Evan Martin, 2010-08-19 23:04:59]

In the interest of keeping changes small, this *only* checks the prefs file
system.  It might be interesting to look at the cache file system and other file
systems as well, but I'll wait for the results from this first.

[tony, 2010-08-19 23:14:20]

LG

http://codereview.chromium.org/3187011/diff/3001/4003
File base/file_util_linux.cc (right):

http://codereview.chromium.org/3187011/diff/3001/4003#newcode15
base/file_util_linux.cc:15: struct statfs statfs_buf;
Nit: drop the struct?

[Markus (顧孟勤), 2010-08-19 23:17:28]

http://codereview.chromium.org/3187011/diff/3001/4003
File base/file_util_linux.cc (right):

http://codereview.chromium.org/3187011/diff/3001/4003#newcode34
base/file_util_linux.cc:34: case 0x58465342:  // XFS
There are a whole bunch of other filesystems that we might encounter. But at the
very least, I'd expect to see the following ones:
0x9123683E btrfs
0x3153464a JFS
0x73757245 Coda
0x858458f6 ramfs
0x01021994 tmpfs

[Evan Martin, 2010-08-20 00:04:49]

New version up, PTAL

http://codereview.chromium.org/3187011/diff/3001/4003
File base/file_util_linux.cc (right):

http://codereview.chromium.org/3187011/diff/3001/4003#newcode15
base/file_util_linux.cc:15: struct statfs statfs_buf;
On 2010/08/19 23:14:20, tony wrote:
> Nit: drop the struct?

Can't, due to statfs being both a struct and a function.

http://codereview.chromium.org/3187011/diff/3001/4003#newcode34
base/file_util_linux.cc:34: case 0x58465342:  // XFS
On 2010/08/19 23:17:29, Markus (顧孟勤) wrote:
> There are a whole bunch of other filesystems that we might encounter. But at
the
> very least, I'd expect to see the following ones:
> 0x9123683E btrfs
> 0x3153464a JFS
> 0x73757245 Coda
> 0x858458f6 ramfs
> 0x01021994 tmpfs
> 

Done.

[Markus (顧孟勤), 2010-08-20 00:18:54]

LGTM