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2021-05-07Merge tag 'nfs-for-5.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfsLinus Torvalds1-19/+47
Pull NFS client updates from Trond Myklebust: "Highlights include: Stable fixes: - Add validation of the UDP retrans parameter to prevent shift out-of-bounds - Don't discard pNFS layout segments that are marked for return Bugfixes: - Fix a NULL dereference crash in xprt_complete_bc_request() when the NFSv4.1 server misbehaves. - Fix the handling of NFS READDIR cookie verifiers - Sundry fixes to ensure attribute revalidation works correctly when the server does not return post-op attributes. - nfs4_bitmask_adjust() must not change the server global bitmasks - Fix major timeout handling in the RPC code. - NFSv4.2 fallocate() fixes. - Fix the NFSv4.2 SEEK_HOLE/SEEK_DATA end-of-file handling - Copy offload attribute revalidation fixes - Fix an incorrect filehandle size check in the pNFS flexfiles driver - Fix several RDMA transport setup/teardown races - Fix several RDMA queue wrapping issues - Fix a misplaced memory read barrier in sunrpc's call_decode() Features: - Micro optimisation of the TCP transmission queue using TCP_CORK - statx() performance improvements by further splitting up the tracking of invalid cached file metadata. - Support the NFSv4.2 'change_attr_type' attribute and use it to optimise handling of change attribute updates" * tag 'nfs-for-5.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (85 commits) xprtrdma: Fix a NULL dereference in frwr_unmap_sync() sunrpc: Fix misplaced barrier in call_decode NFSv4.2: Remove ifdef CONFIG_NFSD from NFSv4.2 client SSC code. xprtrdma: Move fr_mr field to struct rpcrdma_mr xprtrdma: Move the Work Request union to struct rpcrdma_mr xprtrdma: Move fr_linv_done field to struct rpcrdma_mr xprtrdma: Move cqe to struct rpcrdma_mr xprtrdma: Move fr_cid to struct rpcrdma_mr xprtrdma: Remove the RPC/RDMA QP event handler xprtrdma: Don't display r_xprt memory addresses in tracepoints xprtrdma: Add an rpcrdma_mr_completion_class xprtrdma: Add tracepoints showing FastReg WRs and remote invalidation xprtrdma: Avoid Send Queue wrapping xprtrdma: Do not wake RPC consumer on a failed LocalInv xprtrdma: Do not recycle MR after FastReg/LocalInv flushes xprtrdma: Clarify use of barrier in frwr_wc_localinv_done() xprtrdma: Rename frwr_release_mr() xprtrdma: rpcrdma_mr_pop() already does list_del_init() xprtrdma: Delete rpcrdma_recv_buffer_put() xprtrdma: Fix cwnd update ordering ...
2021-04-05NFS: Fix up the support for CONFIG_NFS_DISABLE_UDP_SUPPORTTrond Myklebust1-19/+35
Rather than removing the support in nfs_init_timeout_values(), we should just fix up the validation checks in the mount option parsers. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-05NFS: fs_context: validate UDP retrans to prevent shift out-of-boundsRandy Dunlap1-0/+12
Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller. If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error. Fixes: 9954bf92c0cd ("NFS: Move mount parameterisation bits into their own file") Reported-by: syzbot+ba2e91df8f74809417fa@syzkaller.appspotmail.com Reported-by: syzbot+f3a0fa110fd630ab56c8@syzkaller.appspotmail.com Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: linux-nfs@vger.kernel.org Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-03-22nfs: account for selinux security context when deciding to share superblockOlga Kornievskaia1-0/+3
Keep track of whether or not there were LSM security context options passed during mount (ie creation of the superblock). Then, while deciding if the superblock can be shared for the new mount, check if the newly passed in LSM security context options are compatible with the existing superblock's ones by calling security_sb_mnt_opts_compat(). Previously, with selinux enabled, NFS wasn't able to do the following 2mounts: mount -o vers=4.2,sec=sys,context=system_u:object_r:root_t:s0 <serverip>:/ /mnt mount -o vers=4.2,sec=sys,context=system_u:object_r:swapfile_t:s0 <serverip>:/scratch /scratch 2nd mount would fail with "mount.nfs: an incorrect mount option was specified" and var log messages would have: "SElinux: mount invalid. Same superblock, different security settings for.." Signed-off-by: Olga Kornievskaia <kolga@netapp.com> [PM: tweak subject line] Signed-off-by: Paul Moore <paul@paul-moore.com>
2021-02-17NFS: Set the stable writes flag when initialising the super blockTrond Myklebust1-0/+2
We need to wait for outstanding writes on the page to complete before we can update it. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-02-17NFS: Add mount options supporting eager writesTrond Myklebust1-0/+33
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-12-02NFS: Switch mount code to use xprt_find_transport_ident()Trond Myklebust1-9/+12
Switch the mount code to use xprt_find_transport_ident() and to check the results before allowing the mount to proceed. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-10-20Merge tag 'nfs-for-5.10-1' of git://git.linux-nfs.org/projects/anna/linux-nfsLinus Torvalds1-0/+1
Pull NFS client updates from Anna Schumaker: "Stable Fixes: - Wait for stateid updates after CLOSE/OPEN_DOWNGRADE # v5.4+ - Fix nfs_path in case of a rename retry - Support EXCHID4_FLAG_SUPP_FENCE_OPS v4.2 EXCHANGE_ID flag New features and improvements: - Replace dprintk() calls with tracepoints - Make cache consistency bitmap dynamic - Added support for the NFS v4.2 READ_PLUS operation - Improvements to net namespace uniquifier Other bugfixes and cleanups: - Remove redundant clnt pointer - Don't update timeout values on connection resets - Remove redundant tracepoints - Various cleanups to comments - Fix oops when trying to use copy_file_range with v4.0 source server - Improvements to flexfiles mirrors - Add missing 'local_lock=posix' mount option" * tag 'nfs-for-5.10-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (55 commits) NFSv4.2: support EXCHGID4_FLAG_SUPP_FENCE_OPS 4.2 EXCHANGE_ID flag NFSv4: Fix up RCU annotations for struct nfs_netns_client NFS: Only reference user namespace from nfs4idmap struct instead of cred nfs: add missing "posix" local_lock constant table definition NFSv4: Use the net namespace uniquifier if it is set NFSv4: Clean up initialisation of uniquified client id strings NFS: Decode a full READ_PLUS reply SUNRPC: Add an xdr_align_data() function NFS: Add READ_PLUS hole segment decoding SUNRPC: Add the ability to expand holes in data pages SUNRPC: Split out _shift_data_right_tail() SUNRPC: Split out xdr_realign_pages() from xdr_align_pages() NFS: Add READ_PLUS data segment support NFS: Use xdr_page_pos() in NFSv4 decode_getacl() SUNRPC: Implement a xdr_page_pos() function SUNRPC: Split out a function for setting current page NFS: fix nfs_path in case of a rename retry fs: nfs: return per memcg count for xattr shrinkers NFSv4: Wait for stateid updates after CLOSE/OPEN_DOWNGRADE nfs: remove incorrect fallthrough label ...
2020-10-13Merge branch 'compat.mount' of ↵Linus Torvalds1-71/+124
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull compat mount cleanups from Al Viro: "The last remnants of mount(2) compat buried by Christoph. Buried into NFS, that is. Generally I'm less enthusiastic about "let's use in_compat_syscall() deep in call chain" kind of approach than Christoph seems to be, but in this case it's warranted - that had been an NFS-specific wart, hopefully not to be repeated in any other filesystems (read: any new filesystem introducing non-text mount options will get NAKed even if it doesn't mess the layout up). IOW, not worth trying to grow an infrastructure that would avoid that use of in_compat_syscall()..." * 'compat.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs: remove compat_sys_mount fs,nfs: lift compat nfs4 mount data handling into the nfs code nfs: simplify nfs4_parse_monolithic
2020-10-12nfs: add missing "posix" local_lock constant table definitionScott Mayhew1-0/+1
"mount -o local_lock=posix..." was broken by the mount API conversion due to the missing constant. Fixes: e38bb238ed8c ("NFS: Convert mount option parsing to use functionality from fs_parser.h") Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-09-23fs,nfs: lift compat nfs4 mount data handling into the nfs codeChristoph Hellwig1-0/+62
There is no reason the generic fs code should bother with NFS specific binary mount data - lift the conversion into nfs4_parse_monolithic instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-09-23nfs: simplify nfs4_parse_monolithicChristoph Hellwig1-72/+63
Remove a level of indentation for the version 1 mount data parsing, and simplify the NULL data case a little bit as well. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-08-24treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva1-10/+12
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-12fs: nfs: delete repeated words in commentsRandy Dunlap1-1/+1
Drop duplicated words {the, and} in comments. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: linux-nfs@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-04-03NFS: Fix a few constant_table array definitionsScott Mayhew1-1/+4
nfs_vers_tokens, nfs_xprt_protocol_tokens, and nfs_secflavor_tokens were all missing an empty item at the end of the array, allowing lookup_constant() to potentially walk off the end and trigger and oops. Reported-by: Olga Kornievskaia <aglo@umich.edu> Signed-off-by: Scott Mayhew <smayhew@redhat.com> Fixes: e38bb238ed8c ("NFS: Convert mount option parsing to use functionality from fs_parser.h") Cc: stable@vger.kernel.org # v5.6 Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-25NFS: Don't specify NFS version in "UDP not supported" errorPetr Vorel1-2/+2
UDP was originally disabled in 6da1a034362f for NFSv4. Later in b24ee6c64ca7 UDP is by default disabled by NFS_DISABLE_UDP_SUPPORT=y for all NFS versions. Therefore remove v4 from error message. Fixes: b24ee6c64ca7 ("NFS: allow deprecation of NFS UDP protocol") Signed-off-by: Petr Vorel <pvorel@suse.cz> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-02-25NFS: Fix leak of ctx->nfs_server.hostnameScott Mayhew1-0/+2
If userspace passes an nfs_mount_data struct in the data argument of mount(2), then nfs23_parse_monolithic() or nfs4_parse_monolithic() will allocate memory for ctx->nfs_server.hostname. This needs to be freed in nfs_parse_source(), which also allocates memory for ctx->nfs_server.hostname, otherwise a leak will occur. Reported-by: syzbot+193c375dcddb4f345091@syzkaller.appspotmail.com Fixes: f2aedb713c28 ("NFS: Add fs_context support.") Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-21NFS: Ensure the fs_context has the correct fs_type before mountingScott Mayhew1-0/+7
This is necessary because unless userspace explicitly requests fstype "nfs4" (either via "mount -t nfs4" or by calling the "mount.nfs4" helper directly), the fstype will default to "nfs". This was fine on older kernels because the super_block->s_type was set via mount_info->nfs_mod->nfs_fs, which was set when parsing the mount options and subsequently passed in the "type" argument of sget(). After commit f2aedb713c28 ("NFS: Add fs_context support."), sget_fc(), which has no "type" argument, is called instead. In sget_fc(), the super_block->s_type is set via fs_context->fs_type, which was set when the filesystem context was initially created. Reported-by: Patrick Steinhardt <ps@pks.im> Fixes: f2aedb713c28 ("NFS: Add fs_context support.") Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-07turn fs_param_is_... into functionsAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-02-07fs_parse: handle optional arguments sanelyAl Viro1-6/+12
Don't bother with "mixed" options that would allow both the form with and without argument (i.e. both -o foo and -o foo=bar). Rather than trying to shove both into a single fs_parameter_spec, allow having with-argument and no-argument specs with the same name and teach fs_parse to handle that. There are very few options of that sort, and they are actually easier to handle that way - callers end up with less postprocessing. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-02-07fs_parse: fold fs_parameter_desc/fs_parameter_specAl Viro1-8/+4
The former contains nothing but a pointer to an array of the latter... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-02-07fs_parser: remove fs_parameter_description name fieldEric Sandeen1-1/+0
Unused now. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-02-07fold struct fs_parameter_enum into struct constant_tableAl Viro1-2/+2
no real difference now Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-02-07fs_parse: get rid of ->enumsAl Viro1-30/+32
Don't do a single array; attach them to fsparam_enum() entry instead. And don't bother trying to embed the names into those - it actually loses memory, with no real speedup worth mentioning. Simplifies validation as well. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-01-25nfs: Return EINVAL rather than ERANGE for mount parse errorsDavid Howells1-2/+1
Return EINVAL rather than ERANGE for mount parse errors as the userspace mount command doesn't necessarily understand what to do with anything other than EINVAL. The old code returned -ERANGE as an intermediate error that then get converted to -EINVAL, whereas the new code returns -ERANGE. This was induced by passing minorversion=1 to a v4 mount where CONFIG_NFS_V4_1 was disabled in the kernel build. Fixes: 68f65ef40e1e ("NFS: Convert mount option parsing to use functionality from fs_parser.h") Reported-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-25NFS: allow deprecation of NFS UDP protocolOlga Kornievskaia1-0/+4
Add a kernel config CONFIG_NFS_DISABLE_UDP_SUPPORT to disallow NFS UDP mounts and enable it by default. Signed-off-by: Olga Kornievskaia <kolga@netapp.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Add mount option 'softreval'Trond Myklebust1-2/+12
Add a mount option 'softreval' that allows attribute revalidation 'getattr' calls to time out, and causes them to fall back to using the cached attributes. The use case for this option is for ensuring that we can still (slowly) traverse paths and use cached information even when the server is down. Once the server comes back up again, the getattr calls start succeeding, and the caches will revalidate as usual. The 'softreval' mount option is automatically enabled if you have specified 'softerr'. It can be turned off using the options 'nosoftreval', or 'hard'. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Attach supplementary error information to fs_context.Scott Mayhew1-69/+36
Split out from commit "NFS: Add fs_context support." Add wrappers nfs_errorf(), nfs_invalf(), and nfs_warnf() which log error information to the fs_context. Convert some printk's to use these new wrappers instead. Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Additional refactoring for fs_context conversionScott Mayhew1-99/+56
Split out from commit "NFS: Add fs_context support." This patch adds additional refactoring for the conversion of NFS to use fs_context, namely: (*) Merge nfs_mount_info and nfs_clone_mount into nfs_fs_context. nfs_clone_mount has had several fields removed, and nfs_mount_info has been removed altogether. (*) Various functions now take an fs_context as an argument instead of nfs_mount_info, nfs_fs_context, etc. Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Add fs_context support.David Howells1-154/+316
Add filesystem context support to NFS, parsing the options in advance and attaching the information to struct nfs_fs_context. The highlights are: (*) Merge nfs_mount_info and nfs_clone_mount into nfs_fs_context. This structure represents NFS's superblock config. (*) Make use of the VFS's parsing support to split comma-separated lists (*) Pin the NFS protocol module in the nfs_fs_context. (*) Attach supplementary error information to fs_context. This has the downside that these strings must be static and can't be formatted. (*) Remove the auxiliary file_system_type structs since the information necessary can be conveyed in the nfs_fs_context struct instead. (*) Root mounts are made by duplicating the config for the requested mount so as to have the same parameters. Submounts pick up their parameters from the parent superblock. [AV -- retrans is u32, not string] [SM -- Renamed cfg to ctx in a few functions in an earlier patch] [SM -- Moved fs_context mount option parsing to an earlier patch] [SM -- Moved fs_context error logging to a later patch] [SM -- Fixed printks in nfs4_try_get_tree() and nfs4_get_referral_tree()] [SM -- Added is_remount_fc() helper] [SM -- Deferred some refactoring to a later patch] [SM -- Fixed referral mounts, which were broken in the original patch] [SM -- Fixed leak of nfs_fattr when fs_context is freed] Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Convert mount option parsing to use functionality from fs_parser.hScott Mayhew1-423/+364
Split out from commit "NFS: Add fs_context support." Convert existing mount option definitions to fs_parameter_enum's and fs_parameter_spec's. Parse mount options using fs_parse() and lookup_constant(). Notes: 1) Fixed a typo in the udp6 definition in nfs_xprt_protocol_tokens from the original commit. 2) fs_parse() expects an fs_context as the first arg so that any errors can be logged to the fs_context. We're passing NULL for the fs_context (this will change in commit "NFS: Add fs_context support.") which is okay as it will cause logfc() to do a printk() instead. 3) fs_parse() expects an fs_paramter as the third arg. We're building an fs_parameter manually in nfs_fs_context_parse_option(), which will go away in commit "NFS: Add fs_context support.". Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Do some tidying of the parsing codeDavid Howells1-72/+54
Do some tidying of the parsing code, including: (*) Returning 0/error rather than true/false. (*) Putting the nfs_fs_context pointer first in some arg lists. (*) Unwrap some lines that will now fit on one line. (*) Provide unioned sockaddr/sockaddr_storage fields to avoid casts. (*) nfs_parse_devname() can paste its return values directly into the nfs_fs_context struct as that's where the caller puts them. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Add a small buffer in nfs_fs_context to avoid string dupDavid Howells1-52/+46
Add a small buffer in nfs_fs_context to avoid string duplication when parsing numbers. Also make the parsing function wrapper place the parsed integer directly in the appropriate nfs_fs_context struct member. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Deindent nfs_fs_context_parse_option()David Howells1-372/+367
Deindent nfs_fs_context_parse_option(). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Split nfs_parse_mount_options()David Howells1-56/+70
Split nfs_parse_mount_options() to move the prologue, list-splitting and epilogue into one function and the per-option processing into another. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Rename struct nfs_parsed_mount_data to struct nfs_fs_contextDavid Howells1-224/+222
Rename struct nfs_parsed_mount_data to struct nfs_fs_context and rename pointers to it to "ctx". At some point this will be pointed to by an fs_context struct's fs_private pointer. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Constify mount argument match tablesDavid Howells1-3/+3
The mount argument match tables should never be altered so constify them. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-01-15NFS: Move mount parameterisation bits into their own fileDavid Howells1-0/+1414
Split various bits relating to mount parameterisation out from fs/nfs/super.c into their own file to form the basis of filesystem context handling for NFS. No other changes are made to the code beyond removing 'static' qualifiers. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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