Btrfs: Clean pte corresponding to page straddling i_size

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When extending a file by either "truncate up" or by writing beyond i_size, the
page which had i_size needs to be marked "read only" so that future writes to
the page via mmap interface causes btrfs_page_mkwrite() to be invoked. If not,
a write performed after extending the file via the mmap interface will find
the page to be writaeable and continue writing to the page without invoking
btrfs_page_mkwrite() i.e. we end up writing to a file without reserving disk
space.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Chandan Rajendra 2016-01-21 15:56:03 +05:30 • committed by David Sterba

parent 5a2834f808

commit 27772b68f6

2 changed files with 11 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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12

fs/btrfs/file.c

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2

fs/btrfs/inode.c

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