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author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-30 23:26:25 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-30 23:30:34 +0200 |
commit | 0056e65f9e28d83ee1a3fb4f7d0041e838f03c34 (patch) | |
tree | d19f284da83ab82dc45b293ca4c06df0bd136dff /fs/romfs | |
parent | Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/po... (diff) | |
download | linux-0056e65f9e28d83ee1a3fb4f7d0041e838f03c34.tar.xz linux-0056e65f9e28d83ee1a3fb4f7d0041e838f03c34.zip |
romfs_readpage: don't report errors for pages beyond i_size
We zero-fill them like we are supposed to, and that's all fine. It's
only an error if the 'romfs_copyfrom()' routine isn't able to fill the
data that is supposed to be there.
Most of the patch is really just re-organizing the code a bit, and using
separate variables for the error value and for how much of the page we
actually filled from the filesystem.
Reported-and-tested-by: Chris Fester <cfester@wms.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Matt Waddel <matt.waddel@freescale.com>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-of-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/romfs')
-rw-r--r-- | fs/romfs/inode.c | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/fs/romfs/inode.c b/fs/romfs/inode.c index 8e51a2aaa977..60d2f822e87b 100644 --- a/fs/romfs/inode.c +++ b/fs/romfs/inode.c @@ -418,7 +418,8 @@ static int romfs_readpage(struct file *file, struct page * page) { struct inode *inode = page->mapping->host; - loff_t offset, avail, readlen; + loff_t offset, size; + unsigned long filled; void *buf; int result = -EIO; @@ -430,21 +431,29 @@ romfs_readpage(struct file *file, struct page * page) /* 32 bit warning -- but not for us :) */ offset = page_offset(page); - if (offset < i_size_read(inode)) { - avail = inode->i_size-offset; - readlen = min_t(unsigned long, avail, PAGE_SIZE); - if (romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen) == readlen) { - if (readlen < PAGE_SIZE) { - memset(buf + readlen,0,PAGE_SIZE-readlen); - } - SetPageUptodate(page); - result = 0; + size = i_size_read(inode); + filled = 0; + result = 0; + if (offset < size) { + unsigned long readlen; + + size -= offset; + readlen = size > PAGE_SIZE ? PAGE_SIZE : size; + + filled = romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen); + + if (filled != readlen) { + SetPageError(page); + filled = 0; + result = -EIO; } } - if (result) { - memset(buf, 0, PAGE_SIZE); - SetPageError(page); - } + + if (filled < PAGE_SIZE) + memset(buf + filled, 0, PAGE_SIZE-filled); + + if (!result) + SetPageUptodate(page); flush_dcache_page(page); unlock_page(page); |