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Date: Fri, 18 Sep 2009 10:56:34 +0300
From: Adrian Hunter <adrian.hunter@nokia.com>
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To: Kyungmin Park <kmpark@infradead.org>
Subject: Re: UBIFS warning: ubifs_vm_page_mkwrite: out of space for mmapped
	file
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Cc: "Bityutskiy Artem \(Nokia-D/Helsinki\)" <Artem.Bityutskiy@nokia.com>,
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Kyungmin Park wrote:
> Hi,
> 
> Do you have any clue of following message?
> 
> We used the latest UBIFS.
> 
> [21474583.825000] UBIFS warning (pid 1263): ubifs_vm_page_mkwrite: out
> of space for mmapped file (inode number 2180)
> [21474583.830000] UBIFS warning (pid 1263): ubifs_vm_page_mkwrite: out
> of space for mmapped file (inode number 2180)
> [21474584.190000] UBIFS warning (pid 1362): ubifs_vm_page_mkwrite: out
> of space for mmapped file (inode number 2180)
> [21474584.200000] UBIFS warning (pid 1362): ubifs_vm_page_mkwrite: out
> of space for mmapped file (inode number 2180)

Unlike a block-based file system, in UBIFS if you mmap a file and write to it, 
you can run out of space.

(Actually you can also run out of space on a block-based file system that
implements sparse files and you write into a hole)