| Commit message (Collapse) | Author | Age | Files | Lines |
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In a moment I will be adding some logic that needs to know an
junction's parent export.
Here's a function that can discover an export's parent. It takes
the target export's pathname, chops off the rightmost component, and
tries a lookup_export(). If that succeeds, we have our answer.
If not, it chops off the next rightmost component and tries again,
until the root is reached.
At the same time, infrastructure is added to pass the parent export
down into the functions that convert locations into a new junction
export entry. For now the parent export remains unused.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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To create an export entry for a junction, an options string is
constructed from the set of locations in the junction. This options
string is then passed to mkexportent() where it is parsed and
converted into an exportent.
There is only one export option that is used to create a junction's
exportent: "refer=". When that option is parsed, it's value is
simply copied to a fresh string and planted in the new export's
e_fslocdata field.
Let's avoid the option parsing and extra string copy. Construct
a string for the new e_fslocdata field and plant it in the exportent
directly.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Clean up: Simplify locations_to_export() by constructing a junction's
export options in a static buffer.
We can do this because all of this code is called serially, in one
thread, and the result is thrown away immediately after the caller
is finished. The returned exportent itself is static.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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A broken junction is a problem that administrators will want to
know about and correct.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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From: "J. Bruce Fields" <bfields@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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From: "J. Bruce Fields" <bfields@redhat.com>
Mountd is responsible for filling three interrelated kernel caches:
- auth_unix_ip maps an incoming ip addresses to a "domain".
- nfsd_fh maps (domain, filehandle-fragment) pairs to paths.
- nfsd_export maps (domain, path) pairs to export options.
Note that each export is assocated with a "client" string--the part
before the parentheses in an /etc/export line--which may be a domain
name, a netgroup, etc.
The "domain" string in the above three caches may be either:
- in the !use_ipaddr case, a comma-separated list of client
strings.
- in the use_ipaddr case, an ip address.
In the former case, mountd does the hard work of matching an ip address
to the clients when doing the auth_unix_ip mapping. In the latter case,
it delays that until the nfsd_fh or nfsd_export upcall.
We're currently depending on being able to flush the kernel caches
completely when switching between the use_ipaddr and !use_ipaddr cases.
However, the kernel's cache-flushing doesn't really provide reliable
guarantees on return; it's still possible we could see nfsd_fh or
nfsd_export upcalls with the old domain-type after flushing.
So, instead, make the two domain types self-describing by prepending a
"$" in the use_ipaddr case.
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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From: "J. Bruce Fields" <bfields@redhat.com>
Pull out a tiny bit of common logic from three functions.
Possibly minor overkill, but simplifies the next patch.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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I don't see the point of waiting to the last minute to parse the ip
address. If the client name isn't a legal ip address then this will
fail fairly quickly, so there's not much of a performance penalty.
Also, note the previous code incorrectly assumed client_resolve would
always return non-NULL.
Also factor out some common code.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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After 0509d3428f523 "mountd: Replace "struct hostent" with "struct
addinfo"", the export upcall fails in the use_ipaddr case.
I think we never noticed because a) the use_ipaddr case is rarer than
the !use_ipaddr case, and b) the nfsd_fh upcall does a preemptive export
downcall that renders the nfsd export call unnecessary in some cases.
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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When nfsd_fh it looking for an export for a particular
client and file-handle, it might find two exports for the same path:
one with NFSEXP_V4ROOT, one with out.
As nfsd_fh calls cache_export_ent to give the export information to
the kernel it much choose the same export that auth_authenticate
chooses for get_rootfh which it also passes cache_export_ent (via
cache_export).
i.e. it must choose the non-V4ROOT on where possible.
Also change
strcmp(foo, bar)
to
strcmp(foo, bar) == 0
because I have a pathological fear of the former.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
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lookup_export() claims to "Always prefer non-V4ROOT mounts" (meaning
"exports") but actually prefers V4ROOT exports - once it has 'found'
one it will never replace it.
So fix that inversion, and add code so that it proactively prefers a
non-V4ROOT whether it is found before or after a V4ROOT.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
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To support FedFS and NFS junctions without introducing additional
build-time or run-time dependencies on nfs-utils, the community has
chosen to use a dynamically loadable library to handle junction
resolution.
There is one plug-in library for mountd that will handle any NFS-
related junction type. Currently there are two types:
o nfs-basic locally stored file set location data, and
o nfs-fedfs file set location data stored on an LDAP server
mountd's support for this library is enabled at build time by the
presence of the junction API definition header:
/usr/include/nfs-plugin.h
If this header is not found on the build system, mountd will build
without junction support, and will operate as before.
Note that mountd does not cache junction resolution results. NFSD
already caches these results in its exports cache. Thus each time
NFSD calls up to mountd, it is, in essence, requesting a fresh
junction resolution operation, not a cached response.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Now we can move these big switch statements into helper functions.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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A large part of nfsd_fh() is concerned with extracting
fsid-type-specific information from the fsid, then matching that
information with information from the export list and the filesystem.
Moving all that information into one struct will allow some further
simplifications.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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If a parent is exported with crossmnt, and if a child is also explicitly
exported, then both exports could potentially produce matches in this
loop; that isn't a bug.
Instead of warning and ignoring the second match we find, we should
instead prefer whichever export is deeper in the tree, so that
children's options can override those of their parents.
Reported-by: Olga Kornievskaia <aglo@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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When we get into auth_unix_gid at the second time, groups_len
is not 0 and ngroups variable leave as 0. Then we use ngroups
in getgrouplist that fails in this case. This patch fixes it.
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Commit 5604b35a6 introduced a number of missing initializer
warnings that were missed. This patch removes those warnings.
Signed-off-by: Steve Dickson <steved@redhat.com>
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Previously, when writing to /proc/net/rpc/*/channel, if a cache line
were larger than the default buffer size (likely 1024 bytes), mountd
and svcgssd would split writes into a number of buffer-sized writes.
Each of these writes would get an EINVAL error back from the kernel
procfs handle (it expects line-oriented input and does not account for
multiple/split writes), and no cache update would occur.
When such behavior occurs, NFS clients depending on mountd to finish
the cache operation would block/hang, or receive EPERM, depending on
the context of the operation. This is likely to happen if a user is a
member of a large (~100-200) number of groups.
Instead, every fopen() on the procfs files in question is followed by
a call to setvbuf(), using a per-file dedicated buffer of
RPC_CHAN_BUF_SIZE length.
Really, mountd should not be using stdio-style buffered file operations
on files in /proc to begin with. A better solution would be to use
internally managed buffers and calls to write() instead of these stdio
calls, but that would be a more extensive change; so this is proposed
as a quick and not-so-dirty fix in the meantime.
Signed-off-by: Sean Finney <sean.finney@sonyericsson.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Previously, in auth_unix_gid, group lists were stored in an array of
hard-coded length 100, and in the situation that the group lists for a
particular call were too large, the array was swapped with a dynamically
allocated/freed buffer. For environments where users are commonly in
a large number of groups, this isn't an ideal approach.
Instead, use malloc/realloc to grow the list on an as-needed basis.
Signed-off-by: Sean Finney <sean.finney@sonyericsson.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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From: Trond Myklebust <Trond.Myklebust@netapp.com>
The fedfs ldap server will specify a ttl for its entries.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This is a refactoring change only. There should be no change in
behavior.
Original patch had updates to utils/mountd/junctions.c, which no
longer exists. These are not included here.
Create a macro for the default cache TTL, which is used in several
places besides the export cache.
Make e_ttl unsigned.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Clean up: Squelch compiler warnings and document public parts of
cache API.
cache.c: At top level:
cache.c:67: warning: no previous prototype for auth_unix_ip
cache.c:123: warning: no previous prototype for auth_unix_gid
cache.c:217: warning: no previous prototype for get_uuid
cache.c:247: warning: no previous prototype for uuid_by_path
cache.c:326: warning: no previous prototype for nfsd_fh
cache.c:745: warning: no previous prototype for nfsd_export
cache.c:820: warning: no previous prototype for cache_open
cache.c:832: warning: no previous prototype for cache_set_fd
cache.c:841: warning: no previous prototype for
cache_process_req
cache.c:921: warning: no previous prototype for cache_export
cache.c:953: warning: no previous prototype for
cache_get_filehandle
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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cache.c:812: warning: missing initializer
cache.c:812: warning: (near initialization for 'cachelist[0].f')
cache.c:813: warning: missing initializer
cache.c:813: warning: (near initialization for 'cachelist[1].f')
cache.c:814: warning: missing initializer
cache.c:814: warning: (near initialization for 'cachelist[2].f')
cache.c:815: warning: missing initializer
cache.c:815: warning: (near initialization for 'cachelist[3].f')
cache.c:816: warning: missing initializer
cache.c:816: warning: (near initialization for 'cachelist[4].f')
cache.c: In function 'cache_export_ent':
cache.c:887: warning: comparison between signed and unsigned integer expressions
cache.c:907: warning: comparison between signed and unsigned integer expressions
Signed-off-by: Steve Dickson <steved@redhat.com>
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fsloc.c: In function 'replicas_lookup':
fsloc.c:149: warning: unused parameter 'key'
Signed-off-by: Steve Dickson <steved@redhat.com>
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Fixed Small typo in the new fs uuid comparison code
Signed-off-by: Steve Dickson <steved@redhat.com>
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struct hostent can store either IPv4 or IPv6 addresses, but it can't
store both address families concurrently for the same host. Neither
can hostent deal with parts of socket addresses that are outside of
the sin{,6}_addr field.
Replace the use of "struct hostent" everywhere in libexport.a, mountd,
and exportfs with "struct addrinfo". This is a large change, but
there are so many strong dependencies on struct hostent that this
can't easily be broken into smaller pieces.
One benefit of this change is that hostent_dup() is no longer
required, since the results of getaddrinfo(3) are already dynamically
allocated.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Introduce DNS query helpers based on getaddrinfo(3) and
getnameinfo(3). These will eventually replace the existing
hostent-based functions in support/export/hostname.c.
Put some of these new helpers to immediate use, where convenient.
As they are part of libexport.a, I've added the forward declarations
for these new functions in exportfs.h rather than misc.h, where the
hostent-based forward declarations are currently.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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If you export two subvolumes of a btrfs filesystem, they will both be
given the same uuid so lookups will be confused.
blkid cannot differentiate the two, so we must use the fsid from
statfs64 to identify the filesystem.
We cannot tell if blkid or statfs is best without knowing internal
details of the filesystem in question, so we need to encode specific
knowledge of btrfs in mountd. This is unfortunate.
To ensure smooth handling of this and possible future changes in uuid
generation, we add infrastructure for multiple different uuids to be
recognised on old filehandles, but only the preferred on is used on
new filehandles.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
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To store non-AF_INET addresses in the nfs_client structure, we need to
use more than in_addr for the m_addrlist field. Make m_addrlist
larger, then add a few helper functions to handle type casting and
array indexing cleanly.
We could treat the nfs_client address list as if all the addresses
in the list were the same family. This might work for MCL_SUBNETWORK
type nfs_clients. However, during the transition to IPv6, most hosts
will have at least one IPv4 and one IPv6 address. For MCL_FQDN, I
think we need to have the ability to store addresses from both
families in one nfs_client.
Additionally, IPv6 scope IDs are not part of struct sin6_addr. To
support link-local IPv6 addresses and the like, a scope ID must be
stored.
Thus, each slot in the address list needs to be capable of storing an
entire socket address, and not simply the network address part.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Part of the reason for the previous bug was confusion between "subpath"
and "path"; which is the shorter path, and which the longer?
"child" and "parent" seem less ambiguous.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
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This was obviously wrong, since path[strlen(path)] == '\0'
should always be true.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
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A uid or gid should be represented as unsigned, not signed.
The conversion to signed here could cause a hang on access by an unknown
user to a server running mountd with --manage-gids; such a user is
likely to be mapped to 232-1, which may be converted to 231-1 when
represented as an int, resulting in a downcall for uid 231-1, hence the
original rpc hanging forever waiting for a cache downcall for 232-1.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
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If paths A and A/B are both exported, then we have a choice of exports
to return for A (or under A but still above A/B): we could return A
itself, or we could return a V4ROOT export leading to B.
For now, we will always prefer the non-V4ROOT export, whenever that is
an option. This will allow clients to reach A/B as long as
adminstrators keep to the rule that the security on a parent permits the
union of the access permitted on any descendant.
In the future we may support more complicated arrangements.
(Note: this can't be avoided by simply not creating v4root exports with
the same domain and path, because different domains may have some
overlap.)
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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Currently,
mount --bind /path /path
where /path is a subdirectory of a crossmnt export, can cause client
hangs, since the kernel detects that as a mountpoint, but nfs-util's
is_mountpoint() function does not.
I don't see any sure-fire way to detect such mountpoints. But that's
OK: it's harmless to allow this upcall to succeed even when the
directory is not a mountpoint, so let's just remove this check.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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More trivial cleanup (no change in functionality) to group logical
operations together into a single function.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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Move this main loop to a separate function, to make it a little easier
to follow the logic of the caller.
Also, instead of waiting till we find an export to do the dns
resolution, do it at the start; it will normally be needed anyway, and
this simplifies the control flow.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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2d77e3a27b7b211f303f.. "Fix bug when both crossmnt and fsid are set"
Subexports automatically created by "crossmnt" get the NFSEXP_FSID flag
cleared. That flag should also be cleared in the
security-flavor-specific flag fields. Otherwise the kernel detects the
inconsistent flags and rejects the export.
The symptoms are clients hanging the first time they export a filesystem
mounted under a filesystem that was exported with something like:
/exports *(crossmnt,fsid=0,sec=krb5)
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
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There were some problems with exportfs and rpc.mountd for long export
lists - see https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=76643
I do optimalization as my bachelors thesis (Facuulty of informatics,
Masaryk's university Brno, Czech Republic), under lead of Yenya
Kasprzak.
Both exportfs and rpc.mount build linked list of exports (shared
functions in export.c). Every time they are inserting new export into
list, they search for same export in list.
I replaced linked list by hash table and functions export_add and
export_lookup by functions hash_export_add and hash_export_lookup
(export.c).
Because some other functions required exportlist as linked list, hash
table has some implementation modification im comparison with ordinary
hash table. It also keeps exports in linked list and has pointer to
head of the list. So there's no need of implementation function
<for_all_in_hash_table>.
Signed-off-by: Tomas Richter <krik3t@gmail.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Fix a couple of bugs which show up if you try to explicitly set a
16-byte UUID when exporting a file system. First, exportfs cuts the
first two bytes off the UUID and writes something invalid to etab.
Second, mountd writes the _ascii_ form of the UUID to the kernel,
instead of converting it to hex.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Make sure are zero len group list is sent down to the
kernel when the gids do not exist on the server.
Tested-by: Alex Samad <alex@samad.com.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
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idle disks to spin up for basically no reason.
Signed-off-by: Steinar H. Gunderson <sgunderson@bigfoot.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
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places in the mountd code.
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
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When exported a filesystems with option inherited (by the crossmnt
option) from a higherlevel filesystem, ignore filesystem specific
options like FSID and explicit UUID.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
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Signed-off-by: Steve Dickson <steved@redhat.com>
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explicitly exported, but is below an export point that is flagged as
"crossmnt", it passes the wrong path name to the kernel for the
"filehandle -> directory"
mapping.
This can badly confuse the NFS client, and is certainly wrong.
So use the correct path names.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Steve Dickson <steved@redhat.com>
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If a host is a member of a large number of netgroups, it becomes easily
possible for client_compose to generate a m_hostname string that
overflows the maximum string length allowed by the kernel caches.
This patch adds a new mode for mountd where it will map IP address to IP
address in the auth.unix.ip cache. When this enabled, mountd doesn't
bother using client_compose to build the m_hostname string. It just
populates it with the dotted-quad ip address. When mountd handles a
mount request, it then has an IP address and a path. It then calls
client_check to check the host against export entries where the path has
already matched.
Since we don't bother looking up netgroups which have no relation to the
mount, this can be a big performance gain in netgroup-heavy
configurations. The downside is that every host has a corresponding
entry in the nfsd.export and nfsd.fh caches as well as the auth.unix.ip
cache.
The new behavior is automatically enabled if the length of all of the
concatenated netgroup names in the export table is longer than half
NFSCLNT_IDMAX. The rationale for this logic is that this should allow
for a host to be a member of a long list of netgroups while still
allowing for other matches.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Neil Brown <neilb@suse.de>
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hostent arg
This moves the resolution of IP address to hostent into a helper function
and has other functions call it. Having client_compose take a hostent arg
allows us to avoid an extra hostname lookup in the auth_authenticate
codepath as well. Instead of redoing this lookup in client_compose, we can
simply reuse the hostent that was already generated in auth_authenticate.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Neil Brown <neilb@suse.de>
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