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* new methods: ->read_iter() and ->write_iter()Al Viro2014-05-064-11/+105
| | | | | | | | | | | | | | | | | | Beginning to introduce those. Just the callers for now, and it's clumsier than it'll eventually become; once we finish converting aio_read and aio_write instances, the things will get nicer. For now, these guys are in parallel to ->aio_read() and ->aio_write(); they take iocb and iov_iter, with everything in iov_iter already validated. File offset is passed in iocb->ki_pos, iov/nr_segs - in iov_iter. Main concerns in that series are stack footprint and ability to split the damn thing cleanly. [fix from Peter Ujfalusi <peter.ujfalusi@ti.com> folded] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* replace checking for ->read/->aio_read presence with check in ->f_modeAl Viro2014-05-063-7/+15
| | | | | | | | | | | Since we are about to introduce new methods (read_iter/write_iter), the tests in a bunch of places would have to grow inconveniently. Check once (at open() time) and store results in ->f_mode as FMODE_CAN_READ and FMODE_CAN_WRITE resp. It might end up being a temporary measure - once everything switches from ->aio_{read,write} to ->{read,write}_iter it might make sense to return to open-coded checks. We'll see... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* xfs: trim the argument lists of xfs_file_{dio,buffered}_aio_write()Al Viro2014-05-061-19/+14
| | | | | | | pos is redundant (it's iocb->ki_pos), and iov/nr_segs/count are taken care of by lifting iov_iter into the caller. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* blkdev_aio_read(): switch to generic_file_read_iter(), get rid of iov_shorten()Al Viro2014-05-061-3/+6
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* iov_iter_truncate()Al Viro2014-05-064-28/+26
| | | | | | | | | | | | Now It Can Be Done(tm) - we don't need to do iov_shorten() in generic_file_direct_write() anymore, now that all ->direct_IO() instances are converted to proper iov_iter methods and honour iter->count and iter->iov_offset properly. Get rid of count/ocount arguments of generic_file_direct_write(), while we are at it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* btrfs: switch check_direct_IO() to iov_iterAl Viro2014-05-061-25/+15
| | | | | | ... and don't open-code iov_iter_alignment() there Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: iov_iter_get_pages_alloc()Al Viro2014-05-061-202/+88
| | | | | | | | same as iov_iter_get_pages(), except that pages array is allocated (kmalloc if possible, vmalloc if that fails) and left for caller to free. Lustre and NFS ->direct_IO() switched to it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: iov_iter_npages()Al Viro2014-05-062-22/+3
| | | | | | | | counts the pages covered by iov_iter, up to given limit. do_block_direct_io() and fuse_iter_npages() switched to it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* f2fs: switch to iov_iter_alignment()Al Viro2014-05-061-6/+5
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fuse: switch to iov_iter_get_pages()Al Viro2014-05-061-21/+12
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fuse: pull iov_iter initializations upAl Viro2014-05-063-30/+38
| | | | | | | ... to fuse_direct_{read,write}(). ->direct_IO() path uses the iov_iter passed by the caller instead. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: iov_iter_get_pages()Al Viro2014-05-061-73/+38
| | | | | | | | | | | | | | iov_iter_get_pages(iter, pages, maxsize, &start) grabs references pinning the pages of up to maxsize of (contiguous) data from iter. Returns the amount of memory grabbed or -error. In case of success, the requested area begins at offset start in pages[0] and runs through pages[1], etc. Less than requested amount might be returned - either because the contiguous area in the beginning of iterator is smaller than requested, or because the kernel failed to pin that many pages. direct-io.c switched to using iov_iter_get_pages() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* dio: take updating ->result into do_direct_IO()Al Viro2014-05-061-4/+2
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* start adding the tag to iov_iterAl Viro2014-05-069-17/+17
| | | | | | | | | For now, just use the same thing we pass to ->direct_IO() - it's all iovec-based at the moment. Pass it explicitly to iov_iter_init() and account for kvec vs. iovec in there, by the same kludge NFS ->direct_IO() uses. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new helper: generic_file_read_iter()Al Viro2014-05-062-15/+2
| | | | | | | | | iov_iter-using variant of generic_file_aio_read(). Some callers converted. Note that it's still not quite there for use as ->read_iter() - we depend on having zero iter->iov_offset in O_DIRECT case. Fortunately, that's true for all converted callers (and for generic_file_aio_read() itself). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fuse_file_aio_write(): merge initializations of iov_iterAl Viro2014-05-061-2/+1
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* ceph_aio_read(): keep iov_iter across retriesAl Viro2014-05-061-6/+8
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* new primitive: iov_iter_alignment()Al Viro2014-05-061-22/+5
| | | | | | | returns the value aligned as badly as the worst remaining segment in iov_iter is. Use instead of open-coded equivalents. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch {__,}blockdev_direct_IO() to iov_iterAl Viro2014-05-0618-54/+43
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* get rid of pointless iov_length() in ->direct_IO()Al Viro2014-05-0616-28/+30
| | | | | | all callers have iov_length(iter->iov, iter->nr_segs) == iov_iter_count(iter) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* ext4: switch the guts of ->direct_IO() to iov_iterAl Viro2014-05-063-18/+15
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* convert the guts of nfs_direct_IO() to iov_iterAl Viro2014-05-062-31/+33
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* pass iov_iter to ->direct_IO()Al Viro2014-05-0623-102/+97
| | | | | | unmodified, for now Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* kill generic_segment_checks()Al Viro2014-05-066-39/+9
| | | | | | | | all callers of ->aio_read() and ->aio_write() have iov/nr_segs already checked - generic_segment_checks() done after that is just an odd way to spell iov_length(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* __btrfs_direct_write(): switch to iov_iterAl Viro2014-05-061-11/+8
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* generic_file_direct_write(): switch to iov_iterAl Viro2014-05-064-13/+10
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* kill iov_iter_copy_from_user()Al Viro2014-05-062-6/+4
| | | | | | | all callers can use copy_page_from_iter() and it actually simplifies them. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fs/file.c: don't open-code kvfree()Al Viro2014-05-061-8/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'akpm' (incoming from Andrew)Linus Torvalds2014-05-064-4/+9
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Merge misc fixes from Andrew Morton: "13 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: agp: info leak in agpioc_info_wrap() fs/affs/super.c: bugfix / double free fanotify: fix -EOVERFLOW with large files on 64-bit slub: use sysfs'es release mechanism for kmem_cache revert "mm: vmscan: do not swap anon pages just because free+file is low" autofs: fix lockref lookup mm: filemap: update find_get_pages_tag() to deal with shadow entries mm/compaction: make isolate_freepages start at pageblock boundary MAINTAINERS: zswap/zbud: change maintainer email address mm/page-writeback.c: fix divide by zero in pos_ratio_polynom hugetlb: ensure hugepage access is denied if hugepages are not supported slub: fix memcg_propagate_slab_attrs drivers/rtc/rtc-pcf8523.c: fix month definition
| * fs/affs/super.c: bugfix / double freeFabian Frederick2014-05-061-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | Commit 842a859db26b ("affs: use ->kill_sb() to simplify ->put_super() and failure exits of ->mount()") adds .kill_sb which frees sbi but doesn't remove sbi free in case of parse_options error causing double free+random crash. Signed-off-by: Fabian Frederick <fabf@skynet.be> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> [3.14.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * fanotify: fix -EOVERFLOW with large files on 64-bitWill Woods2014-05-061-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On 64-bit systems, O_LARGEFILE is automatically added to flags inside the open() syscall (also openat(), blkdev_open(), etc). Userspace therefore defines O_LARGEFILE to be 0 - you can use it, but it's a no-op. Everything should be O_LARGEFILE by default. But: when fanotify does create_fd() it uses dentry_open(), which skips all that. And userspace can't set O_LARGEFILE in fanotify_init() because it's defined to 0. So if fanotify gets an event regarding a large file, the read() will just fail with -EOVERFLOW. This patch adds O_LARGEFILE to fanotify_init()'s event_f_flags on 64-bit systems, using the same test as open()/openat()/etc. Addresses https://bugzilla.redhat.com/show_bug.cgi?id=696821 Signed-off-by: Will Woods <wwoods@redhat.com> Acked-by: Eric Paris <eparis@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * autofs: fix lockref lookupIan Kent2014-05-061-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | autofs needs to be able to see private data dentry flags for its dentrys that are being created but not yet hashed and for its dentrys that have been rmdir()ed but not yet freed. It needs to do this so it can block processes in these states until a status has been returned to indicate the given operation is complete. It does this by keeping two lists, active and expring, of dentrys in this state and uses ->d_release() to keep them stable while it checks the reference count to determine if they should be used. But with the recent lockref changes dentrys being freed sometimes don't transition to a reference count of 0 before being freed so autofs can occassionally use a dentry that is invalid which can lead to a panic. Signed-off-by: Ian Kent <raven@themaw.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * hugetlb: ensure hugepage access is denied if hugepages are not supportedNishanth Aravamudan2014-05-061-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, I am seeing the following when I `mount -t hugetlbfs /none /dev/hugetlbfs`, and then simply do a `ls /dev/hugetlbfs`. I think it's related to the fact that hugetlbfs is properly not correctly setting itself up in this state?: Unable to handle kernel paging request for data at address 0x00000031 Faulting instruction address: 0xc000000000245710 Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=2048 NUMA pSeries .... In KVM guests on Power, in a guest not backed by hugepages, we see the following: AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 64 kB HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages are not supported at boot-time, but this is only checked in hugetlb_init(). Extract the check to a helper function, and use it in a few relevant places. This does make hugetlbfs not supported (not registered at all) in this environment. I believe this is fine, as there are no valid hugepages and that won't change at runtime. [akpm@linux-foundation.org: use pr_info(), per Mel] [akpm@linux-foundation.org: fix build when HPAGE_SHIFT is undefined] Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge branch 'for-linus' of ↵Linus Torvalds2014-05-063-219/+111
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs fixes from Al Viro: "dcache fixes + kvfree() (uninlined, exported by mm/util.c) + posix_acl bugfix from hch" The dcache fixes are for a subtle LRU list corruption bug reported by Miklos Szeredi, where people inside IBM saw list corruptions with the LTP/host01 test. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: nick kvfree() from apparmor posix_acl: handle NULL ACL in posix_acl_equiv_mode dcache: don't need rcu in shrink_dentry_list() more graceful recovery in umount_collect() don't remove from shrink list in select_collect() dentry_kill(): don't try to remove from shrink list expand the call of dentry_lru_del() in dentry_kill() new helper: dentry_free() fold try_prune_one_dentry() fold d_kill() and d_free() fix races between __d_instantiate() and checks of dentry flags
| * posix_acl: handle NULL ACL in posix_acl_equiv_modeChristoph Hellwig2014-05-061-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Various filesystems don't bother checking for a NULL ACL in posix_acl_equiv_mode, and thus can dereference a NULL pointer when it gets passed one. This usually happens from the NFS server, as the ACL tools never pass a NULL ACL, but instead of one representing the mode bits. Instead of adding boilerplat to all filesystems put this check into one place, which will allow us to remove the check from other filesystems as well later on. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Ben Greear <greearb@candelatech.com> Reported-by: Marco Munderloh <munderl@tnt.uni-hannover.de>, Cc: Chuck Lever <chuck.lever@oracle.com> Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * dcache: don't need rcu in shrink_dentry_list()Miklos Szeredi2014-05-031-23/+4
| | | | | | | | | | | | | | | | Since now the shrink list is private and nobody can free the dentry while it is on the shrink list, we can remove RCU protection from this. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * more graceful recovery in umount_collect()Al Viro2014-05-031-76/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Start with shrink_dcache_parent(), then scan what remains. First of all, BUG() is very much an overkill here; we are holding ->s_umount, and hitting BUG() means that a lot of interesting stuff will be hanging after that point (sync(2), for example). Moreover, in cases when there had been more than one leak, we'll be better off reporting all of them. And more than just the last component of pathname - %pd is there for just such uses... That was the last user of dentry_lru_del(), so kill it off... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * don't remove from shrink list in select_collect()Al Viro2014-05-031-21/+10
| | | | | | | | | | | | | | | | | | | | | | If we find something already on a shrink list, just increment data->found and do nothing else. Loops in shrink_dcache_parent() and check_submounts_and_drop() will do the right thing - everything we did put into our list will be evicted and if there had been nothing, but data->found got non-zero, well, we have somebody else shrinking those guys; just try again. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * dentry_kill(): don't try to remove from shrink listAl Viro2014-05-011-8/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the victim in on the shrink list, don't remove it from there. If shrink_dentry_list() manages to remove it from the list before we are done - fine, we'll just free it as usual. If not - mark it with new flag (DCACHE_MAY_FREE) and leave it there. Eventually, shrink_dentry_list() will get to it, remove the sucker from shrink list and call dentry_kill(dentry, 0). Which is where we'll deal with freeing. Since now dentry_kill(dentry, 0) may happen after or during dentry_kill(dentry, 1), we need to recognize that (by seeing DCACHE_DENTRY_KILLED already set), unlock everything and either free the sucker (in case DCACHE_MAY_FREE has been set) or leave it for ongoing dentry_kill(dentry, 1) to deal with. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * expand the call of dentry_lru_del() in dentry_kill()Al Viro2014-04-301-1/+6
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * new helper: dentry_free()Al Viro2014-04-301-5/+10
| | | | | | | | | | | | | | The part of old d_free() that dealt with actual freeing of dentry. Taken out of dentry_kill() into a separate function. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fold try_prune_one_dentry()Al Viro2014-04-301-50/+25
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fold d_kill() and d_free()Al Viro2014-04-301-52/+24
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fix races between __d_instantiate() and checks of dentry flagsAl Viro2014-04-192-5/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | in non-lazy walk we need to be careful about dentry switching from negative to positive - both ->d_flags and ->d_inode are updated, and in some places we might see only one store. The cases where dentry has been obtained by dcache lookup with ->i_mutex held on parent are safe - ->d_lock and ->i_mutex provide all the barriers we need. However, there are several places where we run into trouble: * do_last() fetches ->d_inode, then checks ->d_flags and assumes that inode won't be NULL unless d_is_negative() is true. Race with e.g. creat() - we might have fetched the old value of ->d_inode (still NULL) and new value of ->d_flags (already not DCACHE_MISS_TYPE). Lin Ming has observed and reported the resulting oops. * a bunch of places checks ->d_inode for being non-NULL, then checks ->d_flags for "is it a symlink". Race with symlink(2) in case if our CPU sees ->d_inode update first - we see non-NULL there, but ->d_flags still contains DCACHE_MISS_TYPE instead of DCACHE_SYMLINK_TYPE. Result: false negative on "should we follow link here?", with subsequent unpleasantness. Cc: stable@vger.kernel.org # 3.13 and 3.14 need that one Reported-and-tested-by: Lin Ming <minggr@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'for-linus' of ↵Linus Torvalds2014-05-065-86/+172
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse Pull fuse fixes from Miklos Szeredi: "This adds ctime update in the new cached writeback mode and also fixes/simplifies the mtime update handling. Support for rename flags (aka renameat2) is also added to the userspace API" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: fuse: add renameat2 support fuse: clear MS_I_VERSION fuse: clear FUSE_I_CTIME_DIRTY flag on setattr fuse: trust kernel i_ctime only fuse: remove .update_time fuse: allow ctime flushing to userspace fuse: fuse: add time_gran to INIT_OUT fuse: add .write_inode fuse: clean up fsync fuse: fuse: fallocate: use file_update_time() fuse: update mtime on open(O_TRUNC) in atomic_o_trunc mode fuse: update mtime on truncate(2) fuse: do not use uninitialized i_mode fuse: fix mtime update error in fsync fuse: check fallocate mode fuse: add __exit to fuse_ctl_cleanup
| * | fuse: add renameat2 supportMiklos Szeredi2014-04-282-8/+50
| | | | | | | | | | | | | | | | | | Support RENAME_EXCHANGE and RENAME_NOREPLACE flags on the userspace ABI. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
| * | fuse: clear MS_I_VERSIONMiklos Szeredi2014-04-281-1/+1
| | | | | | | | | | | | | | | | | | Fuse doesn't support i_version (yet). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
| * | fuse: clear FUSE_I_CTIME_DIRTY flag on setattrMaxim Patlasov2014-04-281-9/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch addresses two use-cases when the flag may be safely cleared: 1. fuse_do_setattr() is called with ATTR_CTIME flag set in attr->ia_valid. In this case attr->ia_ctime bears actual value. In-kernel fuse must send it to the userspace server and then assign the value to inode->i_ctime. 2. fuse_do_setattr() is called with ATTR_SIZE flag set in attr->ia_valid, whereas ATTR_CTIME is not set (truncate(2)). In this case in-kernel fuse must sent "now" to the userspace server and then assign the value to inode->i_ctime. In both cases we could clear I_DIRTY_SYNC, but that needs more thought. Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
| * | fuse: trust kernel i_ctime onlyMaxim Patlasov2014-04-282-4/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Let the kernel maintain i_ctime locally: update i_ctime explicitly on truncate, fallocate, open(O_TRUNC), setxattr, removexattr, link, rename, unlink. The inode flag I_DIRTY_SYNC serves as indication that local i_ctime should be flushed to the server eventually. The patch sets the flag and updates i_ctime in course of operations listed above. Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
| * | fuse: remove .update_timeMiklos Szeredi2014-04-281-12/+0
| | | | | | | | | | | | | | | | | | This implements updating ctime as well as mtime on file_update_time(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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