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| author | Chandan Rajendra <chandan@linux.vnet.ibm.com> | 2016-01-21 15:56:03 +0530 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-02-01 19:24:29 +0100 |
| commit | 27772b68f6994f0011690899c31717b7cbec51c9 (patch) | |
| tree | 51c06f3d06a72082de3e63e6c7c2a9a710d4369b /fs/btrfs/inode.c | |
| parent | 5a2834f808fd71d056f810b832a5f8869420e3ea (diff) | |
| download | lwn-27772b68f6994f0011690899c31717b7cbec51c9.tar.gz lwn-27772b68f6994f0011690899c31717b7cbec51c9.zip | |
Btrfs: Clean pte corresponding to page straddling i_size
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>
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 8a7c68f1bcdf..7d4b2bf2f44f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4899,7 +4899,6 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr) } if (newsize > oldsize) { - truncate_pagecache(inode, newsize); /* * Don't do an expanding truncate while snapshoting is ongoing. * This is to ensure the snapshot captures a fully consistent @@ -4922,6 +4921,7 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr) i_size_write(inode, newsize); btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); + pagecache_isize_extended(inode, oldsize, newsize); ret = btrfs_update_inode(trans, root, inode); btrfs_end_write_no_snapshoting(root); btrfs_end_transaction(trans, root); |