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authorBoaz Harrosh <bharrosh@panasas.com>2009-12-27 17:01:42 +0200
committerBoaz Harrosh <bharrosh@panasas.com>2010-01-05 09:14:32 +0200
commitefd124b999fb4d426b30675f1684521af0872789 (patch)
treef9421d61b3c4faf682fc1a52b72b241fa9b37558
parent89be503021f550575fc896671b569941140b2c2e (diff)
downloadop-kernel-dev-efd124b999fb4d426b30675f1684521af0872789.zip
op-kernel-dev-efd124b999fb4d426b30675f1684521af0872789.tar.gz
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>
-rw-r--r--fs/exofs/inode.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 698a863..2afbceb 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,
};
/******************************************************************************
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