kernel.git/fs/gfs2, branch linux-2.6.28.y

fs: symlink write_begin allocation context fix

2009-01-18T18:43:46Z

commit 54566b2c1594c2326a645a3551f9d989f7ba3c5e upstream. With the write_begin/write_end aops, page_symlink was broken because it could no longer pass a GFP_NOFS type mask into the point where the allocations happened. They are done in write_begin, which would always assume that the filesystem can be entered from reclaim. This bug could cause filesystem deadlocks. The funny thing with having a gfp_t mask there is that it doesn't really allow the caller to arbitrarily tinker with the context in which it can be called. It couldn't ever be GFP_ATOMIC, for example, because it needs to take the page lock. The only thing any callers care about is __GFP_FS anyway, so turn that into a single flag. Add a new flag for write_begin, AOP_FLAG_NOFS. Filesystems can now act on this flag in their write_begin function. Change __grab_cache_page to accept a nofs argument as well, to honour that flag (while we're there, change the name to grab_cache_page_write_begin which is more instructive and does away with random leading underscores). This is really a more flexible way to go in the end anyway -- if a filesystem happens to want any extra allocations aside from the pagecache ones in ints write_begin function, it may now use GFP_KERNEL (rather than GFP_NOFS) for common case allocations (eg. ocfs2_alloc_write_ctxt, for a random example). [kosaki.motohiro@jp.fujitsu.com: fix ubifs] [kosaki.motohiro@jp.fujitsu.com: fix fuse] Signed-off-by: Nick Piggin Reviewed-by: KOSAKI Motohiro Signed-off-by: KOSAKI Motohiro Signed-off-by: Andrew Morton [ Cleaned up the calling convention: just pass in the AOP flags untouched to the grab_cache_page_write_begin() function. That just simplifies everybody, and may even allow future expansion of the logic. - Linus ] Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

[PATCH] switch all filesystems over to d_obtain_alias

2008-10-23T09:13:01Z

Switch all users of d_alloc_anon to d_obtain_alias. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro

[PATCH] make O_EXCL in nd->intent.flags visible in nd->flags

2008-10-23T09:12:56Z

New flag: LOOKUP_EXCL. Set before doing the final step of pathname resolution on the paths that have LOOKUP_CREATE and O_EXCL. Signed-off-by: Al Viro

vfs: Use const for kernel parser table

2008-10-13T17:10:37Z

This is a much better version of a previous patch to make the parser tables constant. Rather than changing the typedef, we put the "const" in all the various places where its required, allowing the __initconst exception for nfsroot which was the cause of the previous trouble. This was posted for review some time ago and I believe its been in -mm since then. Signed-off-by: Steven Whitehouse Cc: Alexander Viro Signed-off-by: Linus Torvalds

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm

2008-10-10T18:13:55Z

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm: dlm: choose better identifiers dlm: remove bkl dlm: fix address compare dlm: fix locking of lockspace list in dlm_scand dlm: detect available userspace daemon dlm: allow multiple lockspace creates

GFS2: Support for I/O barriers

2008-09-26T09:23:22Z

This patch adds barrier support to GFS2. There is not a lot of change really... we just add the barrier flag when we write journal header blocks. If the underlying device refuses to support them, we fall back to the previous way of doing things (wait for the I/O and hope) since there is nothing else we can do. There is no user configuration, barriers will always be on unless the device refuses to support them. This seems a reasonable solution to me since this is a correctness issue. Signed-off-by: Steven Whitehouse

GFS2: high time to take some time over atime

2008-09-18T12:53:59Z

Until now, we've used the same scheme as GFS1 for atime. This has failed since atime is a per vfsmnt flag, not a per fs flag and as such the "noatime" flag was not getting passed down to the filesystems. This patch removes all the "special casing" around atime updates and we simply use the VFS's atime code. The net result is that GFS2 will now support all the same atime related mount options of any other filesystem on a per-vfsmnt basis. We do lose the "lazy atime" updates, but we gain "relatime". We could add lazy atime to the VFS at a later date, if there is a requirement for that variant still - I suspect relatime will be enough. Also we lose about 100 lines of code after this patch has been applied, and I have a suspicion that it will speed things up a bit, even when atime is "on". So it seems like a nice clean up as well. From a user perspective, everything stays the same except the loss of the per-fs atime quantum tweekable (ought to be per-vfsmnt at the very least, and to be honest I don't think anybody ever used it) and that a number of options which were ignored before now work correctly. Please let me know if you've got any comments. I'm pushing this out early so that you can all see what my plans are. Signed-off-by: Steven Whitehouse

GFS2: The war on bloat

2008-09-18T12:49:32Z

The following patch shrinks the gfs2_args structure which is embedded in every GFS2 superblock. It cuts down the size of the options to a single unsigned int (the 13 bits of bitfields will be rounded up to that size by the compiler) from the current 11 unsigned ints. So on x86 thats 44 bytes shrinking to 4 bytes, in each and every GFS2 superblock. Signed-off-by: Steven Whitehouse

GFS2: GFS2 will panic if you misspell any mount options

2008-09-15T15:08:32Z

The gfs2 superblock pointer is NULL after a failed mount. When control eventually goes to gfs2_kill_sb, we dereference this NULL pointer. This patch ensures that the gfs2 superblock pointer is not NULL before being dereferenced in gfs2_kill_sb. Signed-off-by: Abhijith Das Signed-off-by: Steven Whitehouse

GFS2: Direct IO write at end of file error

2008-09-15T09:31:54Z

This patch fixes a problem whereby a direct_io write doesn't fall back to buffered write properly at end of file. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse