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2012-06-01Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs changes from Al Viro. "A lot of misc stuff. The obvious groups: * Miklos' atomic_open series; kills the damn abuse of ->d_revalidate() by NFS, which was the major stumbling block for all work in that area. * ripping security_file_mmap() and dealing with deadlocks in the area; sanitizing the neighborhood of vm_mmap()/vm_munmap() in general. * ->encode_fh() switched to saner API; insane fake dentry in mm/cleancache.c gone. * assorted annotations in fs (endianness, __user) * parts of Artem's ->s_dirty work (jff2 and reiserfs parts) * ->update_time() work from Josef. * other bits and pieces all over the place. Normally it would've been in two or three pull requests, but signal.git stuff had eaten a lot of time during this cycle ;-/" Fix up trivial conflicts in Documentation/filesystems/vfs.txt (the 'truncate_range' inode method was removed by the VM changes, the VFS update adds an 'update_time()' method), and in fs/btrfs/ulist.[ch] (due to sparse fix added twice, with other changes nearby). * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (95 commits) nfs: don't open in ->d_revalidate vfs: retry last component if opening stale dentry vfs: nameidata_to_filp(): don't throw away file on error vfs: nameidata_to_filp(): inline __dentry_open() vfs: do_dentry_open(): don't put filp vfs: split __dentry_open() vfs: do_last() common post lookup vfs: do_last(): add audit_inode before open vfs: do_last(): only return EISDIR for O_CREAT vfs: do_last(): check LOOKUP_DIRECTORY vfs: do_last(): make ENOENT exit RCU safe vfs: make follow_link check RCU safe vfs: do_last(): use inode variable vfs: do_last(): inline walk_component() vfs: do_last(): make exit RCU safe vfs: split do_lookup() Btrfs: move over to use ->update_time fs: introduce inode operation ->update_time reiserfs: get rid of resierfs_sync_super reiserfs: mark the superblock as dirty a bit later ...
2012-06-01Merge tag 'ext4_for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull Ext4 updates from Theodore Ts'o: "The major new feature added in this update is Darrick J Wong's metadata checksum feature, which adds crc32 checksums to ext4's metadata fields. There is also the usual set of cleanups and bug fixes." * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (44 commits) ext4: hole-punch use truncate_pagecache_range jbd2: use kmem_cache_zalloc wrapper instead of flag ext4: remove mb_groups before tearing down the buddy_cache ext4: add ext4_mb_unload_buddy in the error path ext4: don't trash state flags in EXT4_IOC_SETFLAGS ext4: let getattr report the right blocks in delalloc+bigalloc ext4: add missing save_error_info() to ext4_error() ext4: add debugging trigger for ext4_error() ext4: protect group inode free counting with group lock ext4: use consistent ssize_t type in ext4_file_write() ext4: fix format flag in ext4_ext_binsearch_idx() ext4: cleanup in ext4_discard_allocated_blocks() ext4: return ENOMEM when mounts fail due to lack of memory ext4: remove redundundant "(char *) bh->b_data" casts ext4: disallow hard-linked directory in ext4_lookup ext4: fix potential integer overflow in alloc_flex_gd() ext4: remove needs_recovery in ext4_mb_init() ext4: force ro mount if ext4_setup_super() fails ext4: fix potential NULL dereference in ext4_free_inodes_counts() ext4/jbd2: add metadata checksumming to the list of supported features ...
2012-06-01nfs: don't open in ->d_revalidateMiklos Szeredi
NFSv4 can't do reliable opens in d_revalidate, since it cannot know whether a mount needs to be followed or not. It does check d_mountpoint() on the dentry, which can result in a weird error if the VFS found that the mount does not in fact need to be followed, e.g.: # mount --bind /mnt/nfs /mnt/nfs-clone # echo something > /mnt/nfs/tmp/bar # echo x > /tmp/file # mount --bind /tmp/file /mnt/nfs-clone/tmp/bar # cat /mnt/nfs/tmp/bar cat: /mnt/nfs/tmp/bar: Not a directory Which should, by any sane filesystem, result in "something" being printed. So instead do the open in f_op->open() and in the unlikely case that the cached dentry turned out to be invalid, drop the dentry and return EOPENSTALE to let the VFS retry. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: retry last component if opening stale dentryMiklos Szeredi
NFS optimizes away d_revalidates for last component of open. This means that open itself can find the dentry stale. This patch allows the filesystem to return EOPENSTALE and the VFS will retry the lookup on just the last component if possible. If the lookup was done using RCU mode, including the last component, then this is not possible since the parent dentry is lost. In this case fall back to non-RCU lookup. Currently this is not used since NFS will always leave RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: nameidata_to_filp(): don't throw away file on errorMiklos Szeredi
If open fails, don't put the file. This allows it to be reused if open needs to be retried. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: nameidata_to_filp(): inline __dentry_open()Miklos Szeredi
Copy __dentry_open() into nameidata_to_filp(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_dentry_open(): don't put filpMiklos Szeredi
Move put_filp() out to __dentry_open(), the only caller now. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: split __dentry_open()Miklos Szeredi
Split __dentry_open() into two functions: do_dentry_open() - does most of the actual work, doesn't put file on failure open_check_o_direct() - after a successful open, checks direct_IO method This will allow i_op->atomic_open to do just the file initialization and leave the direct_IO checking to the VFS. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last() common post lookupMiklos Szeredi
Now the post lookup code can be shared between O_CREAT and plain opens since they are essentially the same. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last(): add audit_inode before openMiklos Szeredi
This allows this code to be shared between O_CREAT and plain opens. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last(): only return EISDIR for O_CREATMiklos Szeredi
This allows this code to be shared between O_CREAT and plain opens. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last(): check LOOKUP_DIRECTORYMiklos Szeredi
Check for ENOTDIR before finishing open. This allows this code to be shared between O_CREAT and plain opens. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last(): make ENOENT exit RCU safeMiklos Szeredi
This will allow this code to be used in RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: make follow_link check RCU safeMiklos Szeredi
This will allow this code to be used in RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last(): use inode variableMiklos Szeredi
Use helper variable instead of path->dentry->d_inode before complete_walk(). This will allow this code to be used in RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last(): inline walk_component()Miklos Szeredi
Copy walk_component() into do_lookup(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: do_last(): make exit RCU safeMiklos Szeredi
Allow returning from do_last() with LOOKUP_RCU still set on the "out:" and "exit:" labels. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01vfs: split do_lookup()Miklos Szeredi
Split do_lookup() into two functions: lookup_fast() - does cached lookup without i_mutex lookup_slow() - does lookup with i_mutex Both follow managed dentries. The new functions are needed by atomic_open. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01Btrfs: move over to use ->update_timeJosef Bacik
Btrfs had been doing it's own file_update_time so we could catch ENOSPC properly, so just update our btrfs_update_time to work with the new stuff and then we'll be fancy later. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-01fs: introduce inode operation ->update_timeJosef Bacik
Btrfs has to make sure we have space to allocate new blocks in order to modify the inode, so updating time can fail. We've gotten around this by having our own file_update_time but this is kind of a pain, and Christoph has indicated he would like to make xfs do something different with atime updates. So introduce ->update_time, where we will deal with i_version an a/m/c time updates and indicate which changes need to be made. The normal version just does what it has always done, updates the time and marks the inode dirty, and then filesystems can choose to do something different. I've gone through all of the users of file_update_time and made them check for errors with the exception of the fault code since it's complicated and I wasn't quite sure what to do there, also Jan is going to be pushing the file time updates into page_mkwrite for those who have it so that should satisfy btrfs and make it not a big deal to check the file_update_time() return code in the generic fault path. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
2012-06-01Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs Pull btrfs updates from Chris Mason: "This includes a fairly large change from Josef around data writeback completion. Before, the writeback wasn't completed until the metadata insertions for the extent were done, and this made for fairly large latency spikes on the last page of each ordered extent. We already had a separate mechanism for tracking pending metadata insertions, so Josef just needed to tweak things a little to end writeback earlier on the page. Overall it makes us much friendly to memory reclaim and lowers latencies quite a lot for synchronous IO. Jan Schmidt has finished some background work required to track btree blocks as they go through changes in ownership. It's the missing piece he needed for both btrfs send/receive and subvolume quotas. Neither of those are ready yet, but the new tracking code is included here. Most of the time, the new code is off. It is only used by scrub and other backref walkers. Stefan Behrens has added io failure tracking. This includes counters for which drives are causing the most trouble so the admin (or an automated tool) can choose to kick them out. We're tracking IO errors, crc errors, and generation checks we do on each metadata block. RAID5/6 did miss the cut this time because I'm having trouble with corruptions. I'll nail it down next week and post as a beta testing before 3.6" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (58 commits) Btrfs: fix tree mod log rewinded level and rewinding of moved keys Btrfs: fix tree mod log del_ptr Btrfs: add tree_mod_dont_log helper Btrfs: add missing spin_lock for insertion into tree mod log Btrfs: add inodes before dropping the extent lock in find_all_leafs Btrfs: use delayed ref sequence numbers for all fs-tree updates Btrfs: fix false positive in check-integrity on unmount Btrfs: fix runtime warning in check-integrity check data mode Btrfs: set ioprio of scrub readahead to idle Btrfs: fix return code in drop_objectid_items Btrfs: check to see if the inode is in the log before fsyncing Btrfs: return value of btrfs_read_buffer is checked correctly Btrfs: read device stats on mount, write modified ones during commit Btrfs: add ioctl to get and reset the device stats Btrfs: add device counters for detected IO and checksum errors btrfs: Drop unused function btrfs_abort_devices() Btrfs: fix the same inode id problem when doing auto defragment Btrfs: fall back to non-inline if we don't have enough space Btrfs: fix how we deal with the orphan block rsv Btrfs: convert the inode bit field to use the actual bit operations ...
2012-06-01Merge branch 'for-3.5' of git://linux-nfs.org/~bfields/linuxLinus Torvalds
Pull the rest of the nfsd commits from Bruce Fields: "... and then I cherry-picked the remainder of the patches from the head of my previous branch" This is the rest of the original nfsd branch, rebased without the delegation stuff that I thought really needed to be redone. I don't like rebasing things like this in general, but in this situation this was the lesser of two evils. * 'for-3.5' of git://linux-nfs.org/~bfields/linux: (50 commits) nfsd4: fix, consolidate client_has_state nfsd4: don't remove rebooted client record until confirmation nfsd4: remove some dprintk's and a comment nfsd4: return "real" sequence id in confirmed case nfsd4: fix exchange_id to return confirm flag nfsd4: clarify that renewing expired client is a bug nfsd4: simpler ordering of setclientid_confirm checks nfsd4: setclientid: remove pointless assignment nfsd4: fix error return in non-matching-creds case nfsd4: fix setclientid_confirm same_cred check nfsd4: merge 3 setclientid cases to 2 nfsd4: pull out common code from setclientid cases nfsd4: merge last two setclientid cases nfsd4: setclientid/confirm comment cleanup nfsd4: setclientid remove unnecessary terms from a logical expression nfsd4: move rq_flavor into svc_cred nfsd4: stricter cred comparison for setclientid/exchange_id nfsd4: move principal name into svc_cred nfsd4: allow removing clients not holding state nfsd4: rearrange exchange_id logic to simplify ...
2012-06-01reiserfs: get rid of resierfs_sync_superArtem Bityutskiy
This patch stops reiserfs using the VFS 'write_super()' method along with the s_dirt flag, because they are on their way out. The whole "superblock write-out" VFS infrastructure is served by the 'sync_supers()' kernel thread, which wakes up every 5 (by default) seconds and writes out all dirty superblock using the '->write_super()' call-back. But the problem with this thread is that it wastes power by waking up the system every 5 seconds, even if there are no diry superblocks, or there are no client file-systems which would need this (e.g., btrfs does not use '->write_super()'). So we want to kill it completely and thus, we need to make file-systems to stop using the '->write_super()' VFS service, and then remove it together with the kernel thread. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01reiserfs: mark the superblock as dirty a bit laterArtem Bityutskiy
The 'journal_mark_dirty()' function currently first marks the superblock as dirty by setting 's_dirt' to 1, then does various sanity checks and returns, then actuall does all the magic with the journal. This is not an ideal order, though. It makes more sense to first do all the checks, then do all the internal stuff, and at the end notify the VFS that the superblock is now dirty. This patch moves the 's_dirt = 1' assignment from the very beginning of this function to the very end. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01reiserfs: remove useless superblock dirtyingArtem Bityutskiy
The 'reiserfs_resize()' function marks the superblock as dirty by assigning 1 to 's_dirt' and then calls 'journal_mark_dirty()' which does the same. Thus, we can remove the assignment from 'reiserfs_resize()'. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01reiserfs: clean-up function return typeArtem Bityutskiy
Turn 'reiserfs_flush_old_commits()' into a void function because the callers do not cares about what it returns anyway. We are going to remove the 'sb->s_dirt' field completely and this patch is a small step towards this direction. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01reiserfs: cleanup reiserfs_fill_super a bitArtem Bityutskiy
We have the reiserfs superblock pointer in the 'sbi' variable in this function, no need to use the 'REISERFS_SB(s)' macro which is the same. This is jut a small clean-up. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01sch_atm.c: get rid of poinless externAl Viro
sockfd_lookup() is declared in linux/net.h, which is pulled by linux/skbuff.h (and needed for a lot of other stuff in sch_atm.c anyway). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01unexport do_munmap()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01new helper: vm_mmap_pgoff()Al Viro
take it to mm/util.c, convert vm_mmap() to use of that one and take it to mm/util.c as well, convert both sys_mmap_pgoff() to use of vm_mmap_pgoff() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01kill do_mmap() completelyAl Viro
just pull into vm_mmap() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01switch aio and shm to do_mmap_pgoff(), make do_mmap() staticAl Viro
after all, 0 bytes and 0 pages is the same thing... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01take calculation of final prot in security_mmap_file() into a helperAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01move security_mmap_addr() to saner placeAl Viro
it really should be done by get_unmapped_area(); that cuts down on the amount of callers considerably and it's the right place for that stuff anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01take security_mmap_file() outside of ->mmap_semAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-06-01ext4: hole-punch use truncate_pagecache_rangeHugh Dickins
When truncating a file, we unmap pages from userspace first, as that's usually more efficient than relying, page by page, on the fallback in truncate_inode_page() - particularly if the file is mapped many times. Do the same when punching a hole: 3.4 added truncate_pagecache_range() to do the unmap and trunc, so use it in ext4_ext_punch_hole(), instead of calling truncate_inode_pages_range() directly. Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-06-01jbd2: use kmem_cache_zalloc wrapper instead of flagWanlong Gao
Use kmem_cache_zalloc wrapper instead of flag __GFP_ZERO. Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-05-31ext4: remove mb_groups before tearing down the buddy_cacheSalman Qazi
We can't have references held on pages in the s_buddy_cache while we are trying to truncate its pages and put the inode. All the pages must be gone before we reach clear_inode. This can only be gauranteed if we can prevent new users from grabbing references to s_buddy_cache's pages. The original bug can be reproduced and the bug fix can be verified by: while true; do mount -t ext4 /dev/ram0 /export/hda3/ram0; \ umount /export/hda3/ram0; done & while true; do cat /proc/fs/ext4/ram0/mb_groups; done Signed-off-by: Salman Qazi <sqazi@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
2012-05-31ext4: add ext4_mb_unload_buddy in the error pathSalman Qazi
ext4_free_blocks fails to pair an ext4_mb_load_buddy with a matching ext4_mb_unload_buddy when it fails a memory allocation. Signed-off-by: Salman Qazi <sqazi@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
2012-05-31ext4: don't trash state flags in EXT4_IOC_SETFLAGSTheodore Ts'o
In commit 353eb83c we removed i_state_flags with 64-bit longs, But when handling the EXT4_IOC_SETFLAGS ioctl, we replace i_flags directly, which trashes the state flags which are stored in the high 32-bits of i_flags on 64-bit platforms. So use the the ext4_{set,clear}_inode_flags() functions which use atomic bit manipulation functions instead. Reported-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
2012-05-31ext4: let getattr report the right blocks in delalloc+bigallocTao Ma
In delayed allocation, i_reserved_data_blocks now indicates clusters, not blocks. So report it in the right number. This can be easily exposed by the following command: echo foo > blah; du -hc blah; sync; du -hc blah Reported-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-05-31Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal Pull second pile of signal handling patches from Al Viro: "This one is just task_work_add() series + remaining prereqs for it. There probably will be another pull request from that tree this cycle - at least for helpers, to get them out of the way for per-arch fixes remaining in the tree." Fix trivial conflict in kernel/irq/manage.c: the merge of Andrew's pile had brought in commit 97fd75b7b8e0 ("kernel/irq/manage.c: use the pr_foo() infrastructure to prefix printks") which changed one of the pr_err() calls that this merge moves around. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: keys: kill task_struct->replacement_session_keyring keys: kill the dummy key_replace_session_keyring() keys: change keyctl_session_to_parent() to use task_work_add() genirq: reimplement exit_irq_thread() hook via task_work_add() task_work_add: generic process-context callbacks avr32: missed _TIF_NOTIFY_RESUME on one of do_notify_resume callers parisc: need to check NOTIFY_RESUME when exiting from syscall move key_repace_session_keyring() into tracehook_notify_resume() TIF_NOTIFY_RESUME is defined on all targets now
2012-05-31Merge branch 'for-3.5-take-2' of git://linux-nfs.org/~bfields/linuxLinus Torvalds
Pull nfsd update from Bruce Fields. * 'for-3.5-take-2' of git://linux-nfs.org/~bfields/linux: (23 commits) nfsd: trivial: use SEEK_SET instead of 0 in vfs_llseek SUNRPC: split upcall function to extract reusable parts nfsd: allocate id-to-name and name-to-id caches in per-net operations. nfsd: make name-to-id cache allocated per network namespace context nfsd: make id-to-name cache allocated per network namespace context nfsd: pass network context to idmap init/exit functions nfsd: allocate export and expkey caches in per-net operations. nfsd: make expkey cache allocated per network namespace context nfsd: make export cache allocated per network namespace context nfsd: pass pointer to export cache down to stack wherever possible. nfsd: pass network context to export caches init/shutdown routines Lockd: pass network namespace to creation and destruction routines NFSd: remove hard-coded dereferences to name-to-id and id-to-name caches nfsd: pass pointer to expkey cache down to stack wherever possible. nfsd: use hash table from cache detail in nfsd export seq ops nfsd: pass svc_export_cache pointer as private data to "exports" seq file ops nfsd: use exp_put() for svc_export_cache put nfsd: use cache detail pointer from svc_export structure on cache put nfsd: add link to owner cache detail to svc_export structure nfsd: use passed cache_detail pointer expkey_parse() ...
2012-05-31Merge branch 'akpm' (Andrew's patch-bomb)Linus Torvalds
Merge misc patches from Andrew Morton: - the "misc" tree - stuff from all over the map - checkpatch updates - fatfs - kmod changes - procfs - cpumask - UML - kexec - mqueue - rapidio - pidns - some checkpoint-restore feature work. Reluctantly. Most of it delayed a release. I'm still rather worried that we don't have a clear roadmap to completion for this work. * emailed from Andrew Morton <akpm@linux-foundation.org>: (78 patches) kconfig: update compression algorithm info c/r: prctl: add ability to set new mm_struct::exe_file c/r: prctl: extend PR_SET_MM to set up more mm_struct entries c/r: procfs: add arg_start/end, env_start/end and exit_code members to /proc/$pid/stat syscalls, x86: add __NR_kcmp syscall fs, proc: introduce /proc/<pid>/task/<tid>/children entry sysctl: make kernel.ns_last_pid control dependent on CHECKPOINT_RESTORE aio/vfs: cleanup of rw_copy_check_uvector() and compat_rw_copy_check_uvector() eventfd: change int to __u64 in eventfd_signal() fs/nls: add Apple NLS pidns: make killed children autoreap pidns: use task_active_pid_ns in do_notify_parent rapidio/tsi721: add DMA engine support rapidio: add DMA engine support for RIO data transfers ipc/mqueue: add rbtree node caching support tools/selftests: add mq_perf_tests ipc/mqueue: strengthen checks on mqueue creation ipc/mqueue: correct mq_attr_ok test ipc/mqueue: improve performance of send/recv selftests: add mq_open_tests ...
2012-05-31Merge branch 'drm-prime-vmap' of git://people.freedesktop.org/~airlied/linuxLinus Torvalds
Pull drm prime mmap/vmap code from Dave Airlie: "As mentioned previously these are the extra bits of drm that relied on the dma-buf pull to work, the first three just stub out the mmap interface, and the next set provide vmap export to i915/radeon/nouveau and vmap import to udl." * 'drm-prime-vmap' of git://people.freedesktop.org/~airlied/linux: radeon: add radeon prime vmap support. nouveau: add vmap support to nouveau prime support udl: support vmapping imported dma-bufs i915: add dma-buf vmap support for exporting vmapped buffer radeon: add stub dma-buf mmap functionality nouveau: add stub dma-buf mmap functionality. i915: add stub dma-buf mmap callback.
2012-05-31kconfig: update compression algorithm infoRandy Dunlap
There have been new compression algorithms added without updating nearby relevant descriptive text that refers to (a) the number of compression algorithms and (b) the most recent one. Fix these inconsistencies. Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Reported-by: <qasdfgtyuiop@gmail.com> Cc: Lasse Collin <lasse.collin@tukaani.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Markus Trippelsdorf <markus@trippelsdorf.de> Cc: Alain Knaff <alain@knaff.lu> Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-31c/r: prctl: add ability to set new mm_struct::exe_fileCyrill Gorcunov
When we do restore we would like to have a way to setup a former mm_struct::exe_file so that /proc/pid/exe would point to the original executable file a process had at checkpoint time. For this the PR_SET_MM_EXE_FILE code is introduced. This option takes a file descriptor which will be set as a source for new /proc/$pid/exe symlink. Note it allows to change /proc/$pid/exe if there are no VM_EXECUTABLE vmas present for current process, simply because this feature is a special to C/R and mm::num_exe_file_vmas become meaningless after that. To minimize the amount of transition the /proc/pid/exe symlink might have, this feature is implemented in one-shot manner. Thus once changed the symlink can't be changed again. This should help sysadmins to monitor the symlinks over all process running in a system. In particular one could make a snapshot of processes and ring alarm if there unexpected changes of /proc/pid/exe's in a system. Note -- this feature is available iif CONFIG_CHECKPOINT_RESTORE is set and the caller must have CAP_SYS_RESOURCE capability granted, otherwise the request to change symlink will be rejected. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Kees Cook <keescook@chromium.org> Cc: Tejun Heo <tj@kernel.org> Cc: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-31c/r: prctl: extend PR_SET_MM to set up more mm_struct entriesCyrill Gorcunov
During checkpoint we dump whole process memory to a file and the dump includes process stack memory. But among stack data itself, the stack carries additional parameters such as command line arguments, environment data and auxiliary vector. So when we do restore procedure and once we've restored stack data itself we need to setup mm_struct::arg_start/end, env_start/end, so restored process would be able to find command line arguments and environment data it had at checkpoint time. The same applies to auxiliary vector. For this reason additional PR_SET_MM_(ARG_START | ARG_END | ENV_START | ENV_END | AUXV) codes are introduced. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Kees Cook <keescook@chromium.org> Cc: Tejun Heo <tj@kernel.org> Cc: Andrew Vagin <avagin@openvz.org> Cc: Serge Hallyn <serge.hallyn@canonical.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Vasiliy Kulikov <segoon@openwall.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-31c/r: procfs: add arg_start/end, env_start/end and exit_code members to ↵Cyrill Gorcunov
/proc/$pid/stat We would like to have an ability to restore command line arguments and program environment pointers but first we need to obtain them somehow. Thus we put these values into /proc/$pid/stat. The exit_code is needed to restore zombie tasks. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Kees Cook <keescook@chromium.org> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Serge Hallyn <serge.hallyn@canonical.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Tejun Heo <tj@kernel.org> Cc: Andrew Vagin <avagin@openvz.org> Cc: Vasiliy Kulikov <segoon@openwall.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-31syscalls, x86: add __NR_kcmp syscallCyrill Gorcunov
While doing the checkpoint-restore in the user space one need to determine whether various kernel objects (like mm_struct-s of file_struct-s) are shared between tasks and restore this state. The 2nd step can be solved by using appropriate CLONE_ flags and the unshare syscall, while there's currently no ways for solving the 1st one. One of the ways for checking whether two tasks share e.g. mm_struct is to provide some mm_struct ID of a task to its proc file, but showing such info considered to be not that good for security reasons. Thus after some debates we end up in conclusion that using that named 'comparison' syscall might be the best candidate. So here is it -- __NR_kcmp. It takes up to 5 arguments - the pids of the two tasks (which characteristics should be compared), the comparison type and (in case of comparison of files) two file descriptors. Lookups for pids are done in the caller's PID namespace only. At moment only x86 is supported and tested. [akpm@linux-foundation.org: fix up selftests, warnings] [akpm@linux-foundation.org: include errno.h] [akpm@linux-foundation.org: tweak comment text] Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Andrey Vagin <avagin@openvz.org> Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Glauber Costa <glommer@parallels.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Tejun Heo <tj@kernel.org> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Vasiliy Kulikov <segoon@openwall.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Valdis.Kletnieks@vt.edu Cc: Michal Marek <mmarek@suse.cz> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>