Messages in this thread | | | Date | Thu, 2 Oct 2003 18:23:19 +0100 | From | viro@parcelfa ... | Subject | Re: 2.6.0-test6-mm2 |
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On Thu, Oct 02, 2003 at 09:04:32PM +0400, Nikita Danilov wrote: > Andrew Morton writes: > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.0-test6/2.6.0-test6-mm2/ > > > > . A large series of VFS patches from Al Viro which replace usage of > > file->f_dentry->d_inode->i_mapping with the new file->f_mapping. > > > > This is mainly so we can get disk hot removal right. > > What consequences does this have for (out-of-the-tree) file systems, > beyond s/->f_dentry->d_inode->i_mapping/->f_mapping/g ?
None. It only matters for block device inodes. Out-of-tree fs is free to do whatever it does with inodes of regular files/directories/etc.
In quite a few cases you can cut down on dereferencing that way, but that's covered by what you've mentioned.
If you take a look at the patchset you'll see * change of method prototypes in block devices (aka "you don't need to start with bdev = inode->i_bdev, you get it from arguments" - check RD1--RD6 and you'll see) * a lot of places in mm/* that got aforementioned search-and-replace treatment * very few changes in fs code, most of them of the same variety (same search-and-replace) * couple of helper functions changed their prototypes: generic_write_checks() lost "inode" argument generic_osync_inode(), OTOH, got explicit address_space one.
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