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| author | Boaz Harrosh <bharrosh@panasas.com> | 2009-12-27 17:01:42 +0200 |
|---|---|---|
| committer | Boaz Harrosh <bharrosh@panasas.com> | 2010-01-05 09:14:32 +0200 |
| commit | efd124b999fb4d426b30675f1684521af0872789 (patch) | |
| tree | f9421d61b3c4faf682fc1a52b72b241fa9b37558 /fs/exofs/inode.c | |
| parent | 89be503021f550575fc896671b569941140b2c2e (diff) | |
| download | lwn-efd124b999fb4d426b30675f1684521af0872789.tar.gz lwn-efd124b999fb4d426b30675f1684521af0872789.zip | |
exofs: simple_write_end does not mark_inode_dirty
exofs uses simple_write_end() for it's .write_end handler. But
it is not enough because simple_write_end() does not call
mark_inode_dirty() when it extends i_size. So even if we do
call mark_inode_dirty at beginning of write out, with a very
long IO and a saturated system we might get the .write_inode()
called while still extend-writing to file and miss out on the last
i_size updates.
So override .write_end, call simple_write_end(), and afterwords if
i_size was changed call mark_inode_dirty().
It stands to logic that since simple_write_end() was the one extending
i_size it should also call mark_inode_dirty(). But it looks like all
users of simple_write_end() are memory-bound pseudo filesystems, who
could careless about mark_inode_dirty(). I might submit a
warning-comment patch to simple_write_end() in future.
CC: Stable <stable@kernel.org>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Diffstat (limited to 'fs/exofs/inode.c')
| -rw-r--r-- | fs/exofs/inode.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c index 698a8636d39c..2afbcebeda71 100644 --- a/fs/exofs/inode.c +++ b/fs/exofs/inode.c @@ -738,13 +738,28 @@ static int exofs_write_begin_export(struct file *file, fsdata); } +static int exofs_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + struct inode *inode = mapping->host; + /* According to comment in simple_write_end i_mutex is held */ + loff_t i_size = inode->i_size; + int ret; + + ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata); + if (i_size != inode->i_size) + mark_inode_dirty(inode); + return ret; +} + const struct address_space_operations exofs_aops = { .readpage = exofs_readpage, .readpages = exofs_readpages, .writepage = exofs_writepage, .writepages = exofs_writepages, .write_begin = exofs_write_begin_export, - .write_end = simple_write_end, + .write_end = exofs_write_end, }; /****************************************************************************** |