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2011-03-22smaps: pass pte size argument in to smaps_pte_entry()Dave Hansen
Add an argument to the new smaps_pte_entry() function to let it account in things other than PAGE_SIZE units. I changed all of the PAGE_SIZE sites, even though not all of them can be reached for transparent huge pages, just so this will continue to work without changes as THPs are improved. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: David Rientjes <rientjes@google.com> Reviewed-by: Eric B Munson <emunson@mgebm.net> Tested-by: Eric B Munson <emunson@mgebm.net> Cc: Michael J Wolf <mjwolf@us.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matt Mackall <mpm@selenic.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22smaps: break out smaps_pte_entry() from smaps_pte_range()Dave Hansen
We will use smaps_pte_entry() in a moment to handle both small and transparent large pages. But, we must break it out of smaps_pte_range() first. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: David Rientjes <rientjes@google.com> Reviewed-by: Eric B Munson <emunson@mgebm.net> Tested-by: Eric B Munson <emunson@mgebm.net> Cc: Michael J Wolf <mjwolf@us.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matt Mackall <mpm@selenic.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22pagewalk: only split huge pages when necessaryDave Hansen
Right now, if a mm_walk has either ->pte_entry or ->pmd_entry set, it will unconditionally split any transparent huge pages it runs in to. In practice, that means that anyone doing a cat /proc/$pid/smaps will unconditionally break down every huge page in the process and depend on khugepaged to re-collapse it later. This is fairly suboptimal. This patch changes that behavior. It teaches each ->pmd_entry handler (there are five) that they must break down the THPs themselves. Also, the _generic_ code will never break down a THP unless a ->pte_entry handler is actually set. This means that the ->pmd_entry handlers can now choose to deal with THPs without breaking them down. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Acked-by: David Rientjes <rientjes@google.com> Reviewed-by: Eric B Munson <emunson@mgebm.net> Tested-by: Eric B Munson <emunson@mgebm.net> Cc: Michael J Wolf <mjwolf@us.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matt Mackall <mpm@selenic.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22mm: hugetlbfs: change remove_from_page_cacheMinchan Kim
This patch series changes remove_from_page_cache()'s page ref counting rule. Page cache ref count is decreased in delete_from_page_cache(). So we don't need to decrease the page reference in callers. Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Cc: William Irwin <wli@holomorphy.com> Acked-by: Hugh Dickins <hughd@google.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22mm: add replace_page_cache_page() functionMiklos Szeredi
This function basically does: remove_from_page_cache(old); page_cache_release(old); add_to_page_cache_locked(new); Except it does this atomically, so there's no possibility for the "add" to fail because of a race. If memory cgroups are enabled, then the memory cgroup charge is also moved from the old page to the new. This function is currently used by fuse to move pages into the page cache on read, instead of copying the page contents. [minchan.kim@gmail.com: add freepage() hook to replace_page_cache_page()] Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22Remove pointless memset in nfsacl_encode()Jesper Juhl
Remove pointless memset() in nfsacl_encode(). Thanks to Trond Myklebust <Trond.Myklebust@netapp.com> for pointing out that it is not needed since posix_acl_init() will set everything regardless.. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-22nfs4: Fix NULL dereference at d_alloc_and_lookup()Gusev Vitaliy
d_alloc_and_lookup() calls i_op->lookup method due to rootfh changes his fsid. During mount i_op of NFS root inode is set to nfs_mountpoint_inode_operations, if rpc_ops->getroot() and rpc_ops->getattr() return different fsid. After that nfs_follow_remote_path() raised oops: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [< (null)>] (null) stack trace: d_alloc_and_lookup+0x4c/0x74 do_lookup+0x1e3/0x280 link_path_walk+0x12e/0xab0 nfs4_remote_get_sb+0x56/0x2c0 [nfs] path_walk+0x67/0xe0 vfs_path_lookup+0x8e/0x100 nfs_follow_remote_path+0x16f/0x3e0 [nfs] nfs4_try_mount+0x6f/0xd0 [nfs] nfs_get_sb+0x269/0x400 [nfs] vfs_kern_mount+0x8a/0x1f0 do_kern_mount+0x52/0x130 do_mount+0x20a/0x260 sys_mount+0x90/0xe0 system_call_fastpath+0x16/0x1b So just refresh fsid, as RFC3530 doesn't specify behavior in case of rootfh changes fsid. Signed-off-by: Vitaliy Gusev <gusev.vitaliy@nexenta.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-22Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs: [net/9p]: Introduce basic flow-control for VirtIO transport. 9p: use the updated offset given by generic_write_checks [net/9p] Don't re-pin pages on retrying virtqueue_add_buf(). [net/9p] Set the condition just before waking up. [net/9p] unconditional wake_up to proc waiting for space on VirtIO ring fs/9p: Add v9fs_dentry2v9ses fs/9p: Attach writeback_fid on first open with WR flag fs/9p: Open writeback fid in O_SYNC mode fs/9p: Use truncate_setsize instead of vmtruncate net/9p: Fix compile warning net/9p: Convert the in the 9p rpc call path to GFP_NOFS fs/9p: Fix race in initializing writeback fid
2011-03-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-clientLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: rbd: use watch/notify for changes in rbd header libceph: add lingering request and watch/notify event framework rbd: update email address in Documentation ceph: rename dentry_release -> d_release, fix comment ceph: add request to the tail of unsafe write list ceph: remove request from unsafe list if it is canceled/timed out ceph: move readahead default to fs/ceph from libceph ceph: add ino32 mount option ceph: update common header files ceph: remove debugfs debug cruft libceph: fix osd request queuing on osdmap updates ceph: preserve I_COMPLETE across rename libceph: Fix base64-decoding when input ends in newline.
2011-03-22pstore: cleanups to pstore_dump()Tony Luck
pstore_dump() can be called with many different "reason" codes. Save the name of the code in the persistent store record. Also - only worthwhile calling pstore_mkfile for KMSG_DUMP_OOPS - that is the only one where the kernel will continue running. Reviewed-by: Seiji Aguchi <seiji.aguchi@hds.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2011-03-22Squashfs: Use vmalloc rather than kmalloc for zlib workspacePhillip Lougher
Bugzilla bug 31422 reports occasional "page allocation failure. order:4" at Squashfs mount time. Fix this by making zlib workspace allocation use vmalloc rather than kmalloc. Reported-by: Mehmet Giritli <mehmet@giritli.eu> Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-03-229p: use the updated offset given by generic_write_checksM. Mohan Kumar
Without this fix, even if a file is opened in O_APPEND mode, data will be written at current file position instead of end of file. Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Add v9fs_dentry2v9sesAneesh Kumar K.V
Add the new static inline and use the same Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Attach writeback_fid on first open with WR flagAneesh Kumar K.V
We don't need writeback fid if we are only doing O_RDONLY open Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Open writeback fid in O_SYNC modeAneesh Kumar K.V
Older version of protocol don't support tsyncfs operation. So for them force a O_SYNC flag on the server Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Use truncate_setsize instead of vmtruncateAneesh Kumar K.V
convert vmtruncate usage to truncate_setsize. We also writeback all dirty pages before doing 9p operations and on success call truncate_setsize. This ensure that we continue sanely on failed truncate on the server. The disadvantage is that we are now going to write back the content that get thrown away later as a part of truncate. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Fix race in initializing writeback fidAneesh Kumar K.V
When two process open the same file we can end up with both of them allocating the writeback_fid. Add a new mutex which can be used for synchronizing v9fs_inode member values. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: fuse: make fuse_dentry_revalidate() RCU aware fuse: make fuse_permission() RCU aware fuse: wakeup pollers on connection release/abort fuse: reduce size of struct fuse_request
2011-03-22block: fix non-atomic access to genhd inflight structuresShaohua Li
After the stack plugging introduction, these are called lockless. Ensure that the counters are updated atomically. Signed-off-by: Shaohua Li<shaohua.li@intel.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-03-21ext4: add more tracepoints and use dev_t in the trace bufferJiaying Zhang
- Add more ext4 tracepoints. - Change ext4 tracepoints to use dev_t field with MAJOR/MINOR macros so that we can save 4 bytes in the ring buffer on some platforms. - Add sync_mode to ext4_da_writepages, ext4_da_write_pages, and ext4_da_writepages_result tracepoints. Also remove for_reclaim field from ext4_da_writepages since it is usually not very useful. Signed-off-by: Jiaying Zhang <jiayingz@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-03-21ext4: don't kfree uninitialized s_group_info membersEric Sandeen
We can call kfree on uninitialized members of the s_group_info array on an the error path. We can avoid this by kzalloc'ing the array. This doesn't entirely solve the oops on mount if we fail down this path; failed_mount4: frees the sbi, for one, which gets referenced later in the failed mount paths - I haven't worked that out yet. https://bugzilla.kernel.org/show_bug.cgi?id=30872 Reported-by: Eugene A. Shatokhin <dame_eugene@mail.ru> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-03-21NFS: Fix a hang/infinite loop in nfs_wb_page()Trond Myklebust
When one of the two waits in nfs_commit_inode() is interrupted, it returns a non-negative value, which causes nfs_wb_page() to think that the operation was successful causing it to busy-loop rather than exiting. It also causes nfs_file_fsync() to incorrectly report the file as being successfully committed to disk. This patch fixes both problems by ensuring that we return an error if the attempts to wait fail. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org
2011-03-21FS: Use stable writes when not doing a bulk flushTrond Myklebust
If we're only doing a single write, and there are no other unstable writes being queued up, we might want to just flip to using a stable write RPC call. Reviewed-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-21ext4: add missing space in printk's in __ext4_grp_locked_error()Robin Dong
When we do performence-testing on ext4 filesystem, we observed a warning like this: EXT4-fs error (device sda7): ext4_mb_generate_buddy:718: group 259825901 blocks in bitmap, 26057 in gd instead, it should be "group 2598, 25901 blocks in bitmap, 26057 in gd" Reviewed-by: Coly Li <bosong.ly@taobao.com> Cc: Tao Ma <boyu.mt@taobao.com> Signed-off-by: Robin Dong <sanbai@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-03-21Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfsLinus Torvalds
* 'for-linus' of git://oss.sgi.com/xfs/xfs: (23 commits) xfs: don't name variables "panic" xfs: factor agf counter updates into a helper xfs: clean up the xfs_alloc_compute_aligned calling convention xfs: kill support/debug.[ch] xfs: Convert remaining cmn_err() callers to new API xfs: convert the quota debug prints to new API xfs: rename xfs_cmn_err_fsblock_zero() xfs: convert xfs_fs_cmn_err to new error logging API xfs: kill xfs_fs_mount_cmn_err() macro xfs: kill xfs_fs_repair_cmn_err() macro xfs: convert xfs_cmn_err to xfs_alert_tag xfs: Convert xlog_warn to new logging interface xfs: Convert linux-2.6/ files to new logging interface xfs: introduce new logging API. xfs: zero proper structure size for geometry calls xfs: enable delaylog by default xfs: more sensible inode refcounting for ialloc xfs: stop using xfs_trans_iget in the RT allocator xfs: check if device support discard in xfs_ioc_trim() xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1 ...
2011-03-21pstore: use mount option instead sysfs to tweak kmsg_bytesLuck, Tony
/sys/fs is a somewhat strange way to tweak what could more obviously be tuned with a mount option. Suggested-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-21ceph: rename dentry_release -> d_release, fix commentSage Weil
Just for consistency's sake. Fix obsolete comment too. Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-21ceph: add request to the tail of unsafe write listHenry C Chang
In sync_write_wait(), we assume that the newest request is at the tail of unsafe write list. We should maintain the semantics here. Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-21ceph: remove request from unsafe list if it is canceled/timed outHenry C Chang
This fixes the list corruption warning like this: ------------[ cut here ]------------ WARNING: at lib/list_debug.c:30 __list_add+0x68/0x81() Hardware name: X8DTU list_add corruption. prev->next should be next (ffff880618931250), but was (null). (prev=ffff880c188b9130). Modules linked in: nfsd lockd nfs_acl auth_rpcgss exportfs ceph libceph libcrc32c sunrpc ipv6 fuse igb i2c_i801 ioatdma i2c_core iTCO_wdt iTCO_vendor_support joydev dca serio_raw usb_storage [last unloaded: scsi_wait_scan] Pid: 10977, comm: smbd Tainted: G W 2.6.32.23-170.Elaster.xendom0.fc12.x86_64 #1 Call Trace: [<ffffffff8105753c>] warn_slowpath_common+0x7c/0x94 [<ffffffff810575ab>] warn_slowpath_fmt+0x41/0x43 [<ffffffff812351a3>] __list_add+0x68/0x81 [<ffffffffa014799d>] ceph_aio_write+0x614/0x8a2 [ceph] [<ffffffff8111d2a0>] do_sync_write+0xe8/0x125 [<ffffffff81075a1f>] ? autoremove_wake_function+0x0/0x39 [<ffffffff811f21ec>] ? selinux_file_permission+0x5c/0xb3 [<ffffffff811e8521>] ? security_file_permission+0x16/0x18 [<ffffffff8111d864>] vfs_write+0xae/0x10b [<ffffffff8111d91b>] sys_pwrite64+0x5a/0x76 [<ffffffff81012d32>] system_call_fastpath+0x16/0x1b ---[ end trace 08573eb9f07ff6f4 ]--- Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com> Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-21ceph: move readahead default to fs/ceph from libcephSage Weil
Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-21ceph: add ino32 mount optionYehuda Sadeh
The ino32 mount option forces the ceph fs to report 32 bit ino values. This is useful for 64 bit kernels with 32 bit userspace. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
2011-03-21ceph: remove debugfs debug cruftSage Weil
Whoops! Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-21FS: lookup_mnt() is only used in the core fs routines nowDavid Howells
lookup_mnt() is only used in the core fs routines now, so it doesn't need to be globally declared anymore. It isn't exported to modules at the moment, so nothing that can be modularised seems to be using it. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21fuse: make fuse_dentry_revalidate() RCU awareMiklos Szeredi
Only bail out of fuse_dentry_revalidate() on LOOKUP_RCU when blocking is actually necessary. CC: Nick Piggin <npiggin@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2011-03-21fuse: make fuse_permission() RCU awareMiklos Szeredi
Only bail out of fuse_permission() on IPERM_FLAG_RCU when blocking is actually necessary. CC: Nick Piggin <npiggin@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2011-03-21fuse: wakeup pollers on connection release/abortBryan Green
If a fuse dev connection is broken, wake up any processes that are blocking, in a poll system call, on one of the files in the now defunct filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2011-03-21fuse: reduce size of struct fuse_requestMiklos Szeredi
Reduce the size of struct fuse_request by removing cuse_init_out from the request structure and allocating it dinamically instead. CC: Tejun Heo <tj@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2011-03-21bfs: fix bitmap size argument to find_first_zero_bit()Akinobu Mita
The usage of find_first_zero_bit() in bfs_create() is wrong for two reasons. The bitmap size argument to find_first_zero_bit() is info->si_lasti but the correct bitmap size is info->si_lasti + 1 as info->si_lasti is the last valid index in info->si_imap bitmap. Another problem is that it is impossible to detect that info->si_imap bitmap is full because there is an off-by-one bug in the return value check for find_first_zero_bit(). If no zero bits exist in info->si_imap, find_first_zero_bit() returns info->si_lasti. But the check can't catch it due to the off-by-one. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: "Tigran A. Aivazian" <tigran@aivazian.fsnet.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21fs: Use BUG_ON(!mnt) at dentry_open().Tetsuo Handa
dentry_open() requires callers to pass a valid vfsmount. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21fs: devpts_pty_new() return -ENOMEM if dentry allocation failedAndrey Vagin
In this case nobody can open a slave point, so will be better return from devpts_pty_new() Now we should not check error code from d_find_alias() in devpts_pty_kill(), because the dentry exists all times. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21nfs: lock() vs unlock() typoDan Carpenter
These should be spin_unlock() instead of spin_lock(). It's a typo. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21pstore: fix leaking ->i_privateTony Luck
Move kfree() of i_private out of ->unlink() and into ->evict_inode() Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21introduce sys_syncfs to sync a single file systemSage Weil
It is frequently useful to sync a single file system, instead of all mounted file systems via sync(2): - On machines with many mounts, it is not at all uncommon for some of them to hang (e.g. unresponsive NFS server). sync(2) will get stuck on those and may never get to the one you do care about (e.g., /). - Some applications write lots of data to the file system and then want to make sure it is flushed to disk. Calling fsync(2) on each file introduces unnecessary ordering constraints that result in a large amount of sub-optimal writeback/flush/commit behavior by the file system. There are currently two ways (that I know of) to sync a single super_block: - BLKFLSBUF ioctl on the block device: That also invalidates the bdev mapping, which isn't usually desirable, and doesn't work for non-block file systems. - 'mount -o remount,rw' will call sync_filesystem as an artifact of the current implemention. Relying on this little-known side effect for something like data safety sounds foolish. Both of these approaches require root privileges, which some applications do not have (nor should they need?) given that sync(2) is an unprivileged operation. This patch introduces a new system call syncfs(2) that takes an fd and syncs only the file system it references. Maybe someday we can $ sync /some/path and not get sync: ignoring all arguments The syscall is motivated by comments by Al and Christoph at the last LSF. syncfs(2) seems like an appropriate name given statfs(2). A similar ioctl was also proposed a while back, see http://marc.info/?l=linux-fsdevel&m=127970513829285&w=2 Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21Small typo fix...Holger Hans Peter Freyther
Hi, I was backporting the coredump over pipe feature and noticed this small typo, I wish I would have something bigger to contribute... >From 15d6080e0ed4267da103c706917a33b1015e8804 Mon Sep 17 00:00:00 2001 From: Holger Hans Peter Freyther <holger@moiji-mobile.com> Date: Thu, 24 Feb 2011 17:42:50 +0100 Subject: [PATCH] fs: Fix a small typo in the comment The function is called umh_pipe_setup not uhm_pipe_setup. Signed-off-by: Holger Hans Peter Freyther <holger@moiji-mobile.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21Filesystem: fifo: Fixed coding style issue.David Jenni
Fixed coding style issue. Signed-off-by: David Jenni <dave.j@gmx.ch> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21fs/inode: Fix kernel-doc format for inode_init_ownerBen Hutchings
Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21select: remove unused MAX_SELECT_SECONDSNamhyung Kim
Remove the leftover from the commit 8ff3e8e85fa6 ("select: switch select() and poll() over to hrtimers"). Signed-off-by: Namhyung Kim <namhyung@gmail.com> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-21vfs: cleanup do_vfs_ioctl()Namhyung Kim
Move declaration of 'inode' to beginning of the function. Since it is referenced directly or indirectly (in case of FIFREEZE/FITHAW/ FS_IOC_FIEMAP) it's not harmful IMHO. And remove unnecessary casts using 'argp' instead. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-20ext4: add FITRIM to compat_ioctl.Tao Ma
FITRIM isn't added in compat_ioctl. So a 32 bit program can't be executed in a 64 bit platform. Add it in the compat_ioctl. Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-03-20ext4: handle errors in ext4_clear_blocks()Amir Goldstein
Checking return code from ext4_journal_get_write_access() is important with snapshots, because this function invokes COW, so may return new errors, such as ENOSPC. ext4_clear_blocks() now returns < 0 for fatal errors, in which case, ext4_free_data() is aborted. Signed-off-by: Amir Goldstein <amir73il@users.sf.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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