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* | NFS: Create a try_mount rpc opBryan Schumaker2012-07-30
| | | | | | | | | | | | | | | | | | I'm already looking up the nfs subversion in nfs_fs_mount(), so I have easy access to rpc_ops that used to be difficult to reach. This allows me to set up a different mount path for NFS v2/3 and NFS v4. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* | NFS: Add version registering frameworkBryan Schumaker2012-07-30
|/ | | | | | | | | | | This patch adds in the code to track multiple versions of the NFS protocol. I created default structures for v2, v3 and v4 so that each version can continue to work while I convert them into kernel modules. I also removed the const parameter from the rpc_version array so that I can change it at runtime. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Split out the NFS v4 filesystem typesBryan Schumaker2012-07-17
| | | | | | | | | This allows me to move the v4 mounting and unmounting functions out of the generic client and into a file that is only compiled when CONFIG_NFS_V4 is enabled. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Split out NFS v4 server creating codeBryan Schumaker2012-07-17
| | | | | | | | These functions are specific to NFS v4 and can be moved to nfs4client.c to keep them out of the generic client. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Initialize the NFS v4 client from init_nfs_v4()Bryan Schumaker2012-07-17
| | | | | | | | And split these functions out of the generic client into a v4 specific file. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Split out NFS v4 file operationsBryan Schumaker2012-07-17
| | | | | | | | This patch moves the NFS v4 file functions into a new file that is only compiled when CONFIG_NFS_V4 is enabled. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Split out NFS v2 inode operationsBryan Schumaker2012-07-17
| | | | | | | | This patch moves the NFS v2 file and directory inode functions into files that are only compiled whet CONFIG_NFS_V2 is enabled. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Create an write_pageio_init() functionBryan Schumaker2012-06-29
| | | | | | | | | pNFS needs to select a write function based on the layout driver currently in use, so I let each NFS version decide how to best handle initializing writes. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Create an read_pageio_init() functionBryan Schumaker2012-06-29
| | | | | | | | | pNFS needs to select a read function based on the layout driver currently in use, so I let each NFS version decide how to best handle initializing reads. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Create an alloc_client rpc_opBryan Schumaker2012-06-29
| | | | | | | | This gives NFS v4 a way to set up callbacks and sessions without v2 or v3 having to do them as well. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Create a free_client rpc_opBryan Schumaker2012-06-29
| | | | | | | | NFS v4 needs a way to shut down callbacks and sessions, but v2 and v3 don't. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Ensure that setattr and getattr wait for O_DIRECT write completionTrond Myklebust2012-05-31
| | | | | | | | | | | | Use the same mechanism as the block devices are using, but move the helper functions from fs/direct-io.c into fs/inode.c to remove the dependency on CONFIG_BLOCK. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Fred Isaman <iisaman@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* NFSv4: Fix a race in the net namespace mount notificationTrond Myklebust2012-05-23
| | | | | | | | | | | | | | Since the struct nfs_client gets added to the global nfs_client_list before it is initialised, it is possible that rpc_pipefs_event can end up trying to create idmapper entries on such a thing. The solution is to have the mount notification wait for the initialisation of each nfs_client to complete, and then to skip any entries for which the it failed. Reported-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
* NFSv4.1: Fix session initialisation racesTrond Myklebust2012-05-23
| | | | | | | | | | | | | Session initialisation is not complete until the lease manager has run. We need to ensure that both nfs4_init_session and nfs4_init_ds_session do so, and that they check for any resulting errors in clp->cl_cons_state. Only after this is done, can nfs4_ds_connect check the contents of clp->cl_exchange_flags. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Andy Adamson <andros@netapp.com>
* NFS: Add nfs_client behavior flagsChuck Lever2012-05-22
| | | | | | | | | | | | | "noresvport" and "discrtry" can be passed to nfs_create_rpc_client() by setting flags in the passed-in nfs_client. This change makes it easy to add new flags. Note that these settings are now "sticky" over the lifetime of a struct nfs_client, and may even be copied when an nfs_client is cloned. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Refactor nfs_get_client(): initialize nfs_clientChuck Lever2012-05-22
| | | | | | | | | | | | | | | | | | | Clean up: Continue to rationalize the locking in nfs_get_client() by moving the logic that handles the case where a matching server IP address is not found. When we support server trunking detection, client initialization may return a different nfs_client struct than was passed to it. Change the synopsis of the init_client methods to return an nfs_client. The client initialization logic in nfs_get_client() is not much more than a wrapper around ->init_client. It's simpler to keep the little bits of error handling in the version-specific init_client methods. No behavior change is expected. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFSv4.1 remove nfs4_reset_write and nfs4_reset_readAndy Adamson2012-05-19
| | | | | | | Replaced by filelayout_reset_write and filelayout_reset_read Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFSv4.1 data server timeo and retrans module parametersAndy Adamson2012-05-19
| | | | | | | Set the recovery parameters for data servers. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFSv4.1 set RPC_TASK_SOFTCONN for filelayout DS RPC callsAndy Adamson2012-05-19
| | | | | | | | RPC_TASK_SOFTCONN returns connection errors to the caller which allows the pNFS file layout to quickly try the MDS or perhaps another DS. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Create an NFS v3 stat_to_errno()Bryan Schumaker2012-05-14
| | | | | | | | | | In theory, NFS v3 can have different error versions than NFS v2. v4 is already using its own nfs4_stat_to_errno() to map error codes, so rather than create something in the generic client for v2 and v3 to share I instead give v3 its own function. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Create a single function for text mount dataBryan Schumaker2012-05-14
| | | | | | | | The v2/3 and v4 cases were very similar, with just a few parameters changed. This makes it easy to share code. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFSv2/v3: Simulate the change attributeTrond Myklebust2012-05-01
| | | | | | Use the ctime to simulate a change attribute for NFSv2 and NFSv3. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Create a submount rpc_opBryan Schumaker2012-04-27
| | | | | | | | This simplifies the code for v2 and v3 and gives v4 a chance to decide on referrals without needing to modify the generic client. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Remove secinfo knowledge out of the generic clientBryan Schumaker2012-04-27
| | | | | | | And also remove the unneeded rpc_op. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: rewrite directio write to use async coalesce codeFred Isaman2012-04-27
| | | | | | | This also has the advantage that it allows directio to use pnfs. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: create nfs_commit_completion_opsFred Isaman2012-04-27
| | | | | | | | Factors out the code that needs to change when directio starts using these code paths. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: create struct nfs_commit_infoFred Isaman2012-04-27
| | | | | | | | | | | | | | It is COMMIT that is handled the most differently between the paged and direct paths. Create a structure that encapsulates everything either path needs to know about the commit state. We could use void to hide some of the layout driver stuff, but Trond suggests pulling it out to ensure type checking, given the huge changes being made, and the fact that it doesn't interfere with other drivers. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: rewrite directio read to use async coalesce codeFred Isaman2012-04-27
| | | | | | | This also has the advantage that it allows directio to use pnfs. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: create completion structure to pass into page_init functionsFred Isaman2012-04-27
| | | | | | | | | Factors out the code that will need to change when directio starts using these code paths. This will allow directio to use the generic pagein and flush routines Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: merge _full and _partial write rpc_opsFred Isaman2012-04-27
| | | | | | | | | | | | | | | | | Decouple nfs_pgio_header and nfs_write_data, and have (possibly multiple) nfs_write_datas each take a refcount on nfs_pgio_header. For the moment keeps nfs_write_header as a way to preallocate a single nfs_write_data with the nfs_pgio_header. The code doesn't need this, and would be prettier without, but given the amount of churn I am already introducing I didn't want to play with tuning new mempools. This also fixes bug in pnfs_ld_handle_write_error. In the case of desc->pg_bsize < PAGE_CACHE_SIZE, the pages list was empty, causing replay attempt to do nothing. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: merge _full and _partial read rpc_opsFred Isaman2012-04-27
| | | | | | | | | | | | | | | | | Decouple nfs_pgio_header and nfs_read_data, and have (possibly multiple) nfs_read_datas each take a refcount on nfs_pgio_header. For the moment keeps nfs_read_header as a way to preallocate a single nfs_read_data with the nfs_pgio_header. The code doesn't need this, and would be prettier without, but given the amount of churn I am already introducing I didn't want to play with tuning new mempools. This also fixes bug in pnfs_ld_handle_read_error. In the case of desc->pg_bsize < PAGE_CACHE_SIZE, the pages list was empty, causing replay attempt to do nothing. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: create struct nfs_page_arrayFred Isaman2012-04-27
| | | | | | | | Both nfs_read_data and nfs_write_data devote several fields which can be combined into a single shared struct. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: create common nfs_pgio_header for both read and writeFred Isaman2012-04-27
| | | | | | | | | | | | | | | | | In order to avoid duplicating all the data in nfs_read_data whenever we split it up into multiple RPC calls (either due to a short read result or due to rsize < PAGE_SIZE), we split out the bits that are the same per RPC call into a separate "header" structure. The goal this patch moves towards is to have a single header refcounted by several rpc_data structures. Thus, want to always refer from rpc_data to the header, and not the other way. This patch comes close to that ideal, but the directio code currently needs some special casing, isolated in the nfs_direct_[read_write]hdr_release() functions. This will be dealt with in a future patch. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: reverse arg order in nfs_initiate_[read|write]Fred Isaman2012-04-27
| | | | | | | Make it consistent with nfs_initiate_commit. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: add a struct nfs_commit_data to replace nfs_write_data in commitsFred Isaman2012-04-27
| | | | | | | | Commits don't need the vectors of pages, etc. that writes do. Split out a separate structure for the commit operation. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Honor the authflavor set in the clone mount dataBryan Schumaker2012-04-27
| | | | | | | | | The authflavor is set in an nfs_clone_mount structure and passed to the xdev_mount() functions where it was promptly ignored. Instead, use it to initialize an rpc_clnt for the cloned server. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Fix following referral mount points with different securityBryan Schumaker2012-04-27
| | | | | | | | | I create a new proc_lookup_mountpoint() to use when submounting an NFS v4 share. This function returns an rpc_clnt to use for performing an fs_locations() call on a referral's mountpoint. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: Do secinfo as part of lookupBryan Schumaker2012-04-27
| | | | | | | | | | Whenever lookup sees wrongsec do a secinfo and retry the lookup to find attributes of the file or directory, such as "is this a referral mountpoint?". This also allows me to remove handling -NFS4ERR_WRONSEC as part of getattr xdr decoding. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFSv4.1: Clean ups and bugfixes for the pNFS read/writeback/commit codeTrond Myklebust2012-03-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move more pnfs-isms out of the generic commit code. Bugfixes: - filelayout_scan_commit_lists doesn't need to get/put the lseg. In fact since it is run under the inode->i_lock, the lseg_put() can deadlock. - Ensure that we distinguish between what needs to be done for commit-to-data server and what needs to be done for commit-to-MDS using the new flag PG_COMMIT_TO_DS. Otherwise we may end up calling put_lseg() on a bucket for a struct nfs_page that got written through the MDS. - Fix a case where we were using list_del() on an nfs_page->wb_list instead of list_del_init(). - filelayout_initiate_commit needs to call filelayout_commit_release on error instead of the mds_ops->rpc_release(). Otherwise it won't clear the commit lock. Cleanups: - Let the files layout manage the commit lists for the pNFS case. Don't expose stuff like pnfs_choose_commit_list, and the fact that the commit buckets hold references to the layout segment in common code. - Cast out the put_lseg() calls for the struct nfs_read/write_data->lseg into the pNFS layer from whence they came. - Let the pNFS layer manage the NFS_INO_PNFS_COMMIT bit. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Fred Isaman <iisaman@netapp.com>
* NFS: remove nfs_inode radix treeFred Isaman2012-03-10
| | | | | | | | The radix tree is only being used to compile lists of reqs needing commit. It is simpler to just put the reqs directly into a list. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: search for client session id in proper network namespaceStanislav Kinsbursky2012-02-06
| | | | | | | | Network namespace is taken from request transport and passed as a part of cb_process_state structure. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: make nfs_client_lock per net nsStanislav Kinsbursky2012-02-06
| | | | | | | | This patch makes nfs_clients_lock allocated per network namespace. All items it protects are already network namespace aware. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: make cb_ident_idr per net nsStanislav Kinsbursky2012-02-06
| | | | | | | | | | | | This patch makes ID's infrastructure network namespace aware. This was done mainly because of nfs_client_lock, which is desired to be per network namespace, but protects NFS clients ID's. NOTE: NFS client's net pointer have to be set prior to ID initialization, proper assignment was moved. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: make nfs_client_list per net nsStanislav Kinsbursky2012-02-06
| | | | | | | | | | | | | | | | | | | | This patch splits global list of NFS clients into per-net-ns array of lists. This looks more strict and clearer. BTW, this patch also makes "/proc/fs/nfsfs/servers" entry content depends on /proc mount owner pid namespace. See below for details. NOTE: few words about how was /proc/fs/nfsfs/ entries content show per network namespace done. This is a little bit tricky and not the best is could be. But it's cheap (proper fix for /proc conteinerization is a hard nut to crack). The idea is simple: take proper network namespace from pid namespace child reaper nsproxy of /proc/ mount creator. This actually means, that if there are 2 containers with different net namespace sharing pid namespace, then read of /proc/fs/nfsfs/ entries will always return content, taken from net namespace of pid namespace creator task (and thus second namespace set wil be unvisible). Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* SUNRPC: constify the rpc_programTrond Myklebust2012-01-31
| | | | Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: remove unused nfs4_find_client_no_ident functionStanislav Kinsbursky2012-01-31
| | | | | | | | Looks like this function survived after some cleanup patch without a reason. Now it's not called or referenced and I believe, that it can be simply removed. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: idmap PipeFS notifier introducedStanislav Kinsbursky2012-01-31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | v2: 1) Added "nfs_idmap_init" and "nfs_idmap_quit" definitions for kernels built without CONFIG_NFS_V4 option set. This patch subscribes NFS clients to RPC pipefs notifications. Idmap notifier is registering on NFS module load. This notifier callback is responsible for creation/destruction of PipeFS idmap pipe dentry for NFS4 clients. Since ipdmap pipe is created in rpc client pipefs directory, we have make sure, that this directory has been created already. IOW RPC client notifier callback has been called already. To achive this, PipeFS notifier priorities has been introduced (RPC clients notifier priority is greater than NFS idmap one). But this approach gives another problem: unlink for RPC client directory will be called before NFS idmap pipe unlink on UMOUNT event and will fail, because directory is not empty. The solution, introduced in this patch, is to try to remove client directory once again after idmap pipe was unlinked. This looks like ugly hack, so probably it should be replaced in some more elegant way. Note that no locking required in notifier callback because PipeFS superblock pointer is passed as an argument from it's creation or destruction routine and thus we can be sure about it's validity. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: pass NFS client owner network namespace to RPC client creation routineStanislav Kinsbursky2012-01-31
| | | | | | | | This patch replaces static "init_net" with nfs_client->net pointer in RPC client creation calls. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* NFS: make NFS client allocated per network namespace contextStanislav Kinsbursky2012-01-31
| | | | | | | | | | | | This patch adds new net variable to nfs_client structure. This variable is set on NFS client creation and cheched during matching NFS client search. Initially current->nsproxy->net_ns is used as network namespace owner for new NFS client to create. This network namespace pointer is set during mount options parsing and thus can be passed from user-spave utils in future if will be necessary. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* mm: compaction: introduce sync-light migration for use by compactionMel Gorman2012-01-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a lightweight sync migrate operation MIGRATE_SYNC_LIGHT mode that avoids writing back pages to backing storage. Async compaction maps to MIGRATE_ASYNC while sync compaction maps to MIGRATE_SYNC_LIGHT. For other migrate_pages users such as memory hotplug, MIGRATE_SYNC is used. This avoids sync compaction stalling for an excessive length of time, particularly when copying files to a USB stick where there might be a large number of dirty pages backed by a filesystem that does not support ->writepages. [aarcange@redhat.com: This patch is heavily based on Andrea's work] [akpm@linux-foundation.org: fix fs/nfs/write.c build] [akpm@linux-foundation.org: fix fs/btrfs/disk-io.c build] Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Dave Jones <davej@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Andy Isaacson <adi@hexapodia.org> Cc: Nai Xia <nai.xia@gmail.com> Cc: Johannes Weiner <jweiner@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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