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path: root/fs/nfs/getroot.c
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2021-06-28nfs: update has_sec_mnt_opts after cloning lsm options from parentScott Mayhew1-4/+8
After calling security_sb_clone_mnt_opts() in nfs_get_root(), it's necessary to copy the value of has_sec_mnt_opts from the cloned super_block's nfs_server. Otherwise, calls to nfs_compare_super() using this super_block may not return the correct result, leading to mount failures. For example, mounting an nfs server with the following in /etc/exports: /export *(rw,insecure,crossmnt,no_root_squash,security_label) and having /export/scratch on a separate block device. mount -o v4.2,context=system_u:object_r:root_t:s0 server:/export/test /mnt/test mount -o v4.2,context=system_u:object_r:swapfile_t:s0 server:/export/scratch /mnt/scratch The second mount would fail with "mount.nfs: /mnt/scratch is busy or already mounted or sharecache fail" and "SELinux: mount invalid. Same superblock, different security settings for..." would appear in the syslog. Also while we're in there, replace several instances of "NFS_SB(s)" with "server", which was already declared at the top of the nfs_get_root(). Fixes: ec1ade6a0448 ("nfs: account for selinux security context when deciding to share superblock") Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-03-30NFS: Ensure security label is set for root inodeScott Mayhew1-4/+35
When using NFSv4.2, the security label for the root inode should be set via a call to nfs_setsecurity() during the mount process, otherwise the inode will appear as unlabeled for up to acdirmin seconds. Currently the label for the root inode is allocated, retrieved, and freed entirely witin nfs4_proc_get_root(). Add a field for the label to the nfs_fattr struct, and allocate & free the label in nfs_get_root(), where we also add a call to nfs_setsecurity(). Note that for the call to nfs_setsecurity() to succeed, it's necessary to also move the logic calling security_sb_{set,clone}_security() from nfs_get_tree_common() down into nfs_get_root()... otherwise the SBLABEL_MNT flag will not be set in the super_block's security flags and nfs_setsecurity() will silently fail. Reported-by: Richard Haines <richard_c_haines@btinternet.com> Signed-off-by: Scott Mayhew <smayhew@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Tested-by: Stephen Smalley <sds@tycho.nsa.gov> [PM: fixed 80-char line width problems] Signed-off-by: Paul Moore <paul@paul-moore.com>
2020-01-15NFS: Attach supplementary error information to fs_context.Scott Mayhew1-0/+3
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 Mayhew1-34/+36
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>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner1-5/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-12-24Replace <asm/uaccess.h> with <linux/uaccess.h> globallyLinus Torvalds1-1/+1
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-15VFS: normal filesystems (and lustre): d_inode() annotationsDavid Howells1-2/+2
that's the bulk of filesystem drivers dealing with inodes of their own Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-19switch d_materialise_unique() users to d_splice_alias()Al Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-03move d_rcu from overlapping d_child to overlapping d_aliasAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-08-07dcache: d_obtain_alias callers don't all want DISCONNECTEDJ. Bruce Fields1-1/+1
There are a few d_obtain_alias callers that are using it to get the root of a filesystem which may already have an alias somewhere else. This is not the same as the filehandle-lookup case, and none of them actually need DCACHE_DISCONNECTED set. It isn't really a serious problem, but it would really be clearer if we reserved DCACHE_DISCONNECTED for those cases where it's actually needed. In the btrfs case this was causing a spurious printk from nfsd/nfsfh.c:fh_verify when it found an unexpected DCACHE_DISCONNECTED dentry. Josef worked around this by unsetting DCACHE_DISCONNECTED manually in 3a0dfa6a12e "Btrfs: unset DCACHE_DISCONNECTED when mounting default subvol", and this replaces that workaround. Cc: Josef Bacik <jbacik@fb.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-04-15NFS: Fix memroy leak for double mountsKinglong Mee1-1/+2
When double mounting same nfs filesystem, the devname saved in d_fsdata will be lost.The second mount should not change the devname that be saved in d_fsdata. Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2013-06-08NFS:Add labels to client function prototypesDavid Quigley1-1/+1
After looking at all of the nfsv4 operations the label structure has been added to the prototypes of the functions which can transmit label data. Signed-off-by: Matthew N. Dodd <Matthew.Dodd@sparta.com> Signed-off-by: Miguel Rodel Felipe <Rodel_FM@dsi.a-star.edu.sg> Signed-off-by: Phua Eu Gene <PHUA_Eu_Gene@dsi.a-star.edu.sg> Signed-off-by: Khin Mi Mi Aung <Mi_Mi_AUNG@dsi.a-star.edu.sg> Signed-off-by: Steve Dickson <steved@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-02-17nfs: remove kfree() redundant null checksTim Gardner1-2/+1
smatch analysis: fs/nfs/getroot.c:130 nfs_get_root() info: redundant null check on name calling kfree() fs/nfs/unlink.c:272 nfs_async_unlink() info: redundant null check on devname_garbage calling kfree() Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: linux-nfs@vger.kernel.org Signed-off-by: Tim Gardner <tim.gardner@canonical.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-10-02nfs: include internal.h in getroot.hStanislav Kinsbursky1-0/+2
Sparse warning: fs/nfs/nfs4getroot.c:11:5: warning: symbol 'nfs4_get_rootfh' was not declared. Should it be static? Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-07-17NFS: Move the v4 getroot code to nfs4getroot.cBryan Schumaker1-50/+0
Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-07-14vfs: switch i_dentry/d_alias to hlistAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-05-14NFS: Create a single nfs_get_root()Bryan Schumaker1-83/+0
This patch splits out the NFS v4 specific functionality of nfs4_get_root() into its own rpc_op called by the generic client, and leaves nfs4_proc_get_rootfh() as its own stand alone function. This also allows me to change nfs4_remote_mount(), nfs4_xdev_mount() and nfs4_remote_referral_mount() to use the generic client's nfs_get_root() function. Later patches in this series will collapse these functions into one common function, so using the same get_root() function everywhere simplifies future changes. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-05-14NFS: Rename nfs4_proc_get_root()Bryan Schumaker1-1/+1
This function is really getting the root filehandle and not the root dentry of the filesystem. I also removed the rpc_ops lookup from nfs4_get_rootfh() under the assumption that if we reach this function then we already know we are using NFS v4. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-03-28Remove all #inclusions of asm/system.hDavid Howells1-1/+0
Remove all #inclusions of asm/system.h preparatory to splitting and killing it. Performed with the following command: perl -p -i -e 's!^#\s*include\s*<asm/system[.]h>.*\n!!' `grep -Irl '^#\s*include\s*<asm/system[.]h>' *` Signed-off-by: David Howells <dhowells@redhat.com>
2012-03-20switch open-coded instances of d_make_root() to new helperAl Viro1-4/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-24Merge branch 'nfs-for-2.6.39' into nfs-for-nextTrond Myklebust1-0/+4
2011-03-22nfs4: Fix NULL dereference at d_alloc_and_lookup()Gusev Vitaliy1-0/+4
d_alloc_and_lookup() calls i_op->lookup method due to rootfh changes his fsid. During mount i_op of NFS root inode is set to nfs_mountpoint_inode_operations, if rpc_ops->getroot() and rpc_ops->getattr() return different fsid. After that nfs_follow_remote_path() raised oops: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [< (null)>] (null) stack trace: d_alloc_and_lookup+0x4c/0x74 do_lookup+0x1e3/0x280 link_path_walk+0x12e/0xab0 nfs4_remote_get_sb+0x56/0x2c0 [nfs] path_walk+0x67/0xe0 vfs_path_lookup+0x8e/0x100 nfs_follow_remote_path+0x16f/0x3e0 [nfs] nfs4_try_mount+0x6f/0xd0 [nfs] nfs_get_sb+0x269/0x400 [nfs] vfs_kern_mount+0x8a/0x1f0 do_kern_mount+0x52/0x130 do_mount+0x20a/0x260 sys_mount+0x90/0xe0 system_call_fastpath+0x16/0x1b So just refresh fsid, as RFC3530 doesn't specify behavior in case of rootfh changes fsid. Signed-off-by: Vitaliy Gusev <gusev.vitaliy@nexenta.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-16nfs: store devname at disconnected NFS rootsAl Viro1-4/+32
part 2: make sure that disconnected roots have corresponding mnt_devname values stashed into them. Have nfs*_get_root() stuff a copy of devname into ->d_fsdata of the found root, provided that it is disconnected. Have ->d_release() free it when dentry goes away. Have the places where NFS uses ->d_fsdata for sillyrename (and that can *never* happen to a disconnected root - dentry will be attached to its parent) free old devname copies if they find those. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-16nfs: propagate devname to nfs{,4}_get_root()Al Viro1-2/+4
step 1 of ->mnt_devname fixes: make sure we have the value of devname available in ..._get_root(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-12switch nfs to ->s_d_opAl Viro1-6/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-07fs: dcache per-inode inode alias lockingNick Piggin1-2/+2
dcache_inode_lock can be replaced with per-inode locking. Use existing inode->i_lock for this. This is slightly non-trivial because we sometimes need to find the inode from the dentry, which requires d_inode to be stabilised (either with refcount or d_lock). Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache reduce branches in lookup pathNick Piggin1-2/+2
Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache remove dcache_lockNick Piggin1-2/+0
dcache_lock no longer protects anything. remove it. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: scale inode alias listNick Piggin1-0/+4
Add a new lock, dcache_inode_lock, to protect the inode's i_dentry list from concurrent modification. d_alias is also protected by d_lock. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2010-10-25new helper: ihold()Al Viro1-2/+1
Clones an existing reference to inode; caller must already hold one. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-06-22nfs4 use mandatory attribute file type in nfs4_get_rootAndy Adamson1-1/+1
S_ISDIR(fsinfo.fattr->mode) checks the file type rather than the mode bits, so we should be checking for the NFS_ATTR_FATTR_TYPE fattr property. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org
2010-05-14NFSv4: Reduce stack footprint of nfs4_get_root()Trond Myklebust1-30/+46
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14NFSv4: Eliminate nfs4_path_walk()Trond Myklebust1-93/+22
All we really want is the ability to retrieve the root file handle. We no longer need the ability to walk down the path, since that is now done in nfs_follow_remote_path(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-07-08headers: mnt_namespace.h reduxAlexey Dobriyan1-1/+0
Fix various silly problems wrt mnt_namespace.h: - exit_mnt_ns() isn't used, remove it - done that, sched.h and nsproxy.h inclusions aren't needed - mount.h inclusion was need for vfsmount_lock, but no longer - remove mnt_namespace.h inclusion from files which don't use anything from mnt_namespace.h Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-11NFS: Fix the type of struct nfs_fattr->modeTrond Myklebust1-2/+2
There is no point in using anything other than umode_t, since we copy the content pretty much directly into inode->i_mode. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-10-23[PATCH] switch all filesystems over to d_obtain_aliasChristoph Hellwig1-8/+6
Switch all users of d_alloc_anon to d_obtain_alias. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-07Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p)David Howells1-2/+2
Convert instances of ERR_PTR(PTR_ERR(p)) to ERR_CAST(p) using: perl -spi -e 's/ERR_PTR[(]PTR_ERR[(](.*)[)][)]/ERR_CAST(\1)/' `grep -rl 'ERR_PTR[(]*PTR_ERR' fs crypto net security` Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-12-12NFS: Fix an Oops in NFS unmountTrond Myklebust1-0/+11
Ensure that the dummy 'root dentry' is invisible to d_find_alias(). If not, then it may be spliced into the tree if a parent directory from the same filesystem gets mounted at a later time. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-11-17NFS: Fix the ustat() regressionTrond Myklebust1-54/+27
Since 2.6.18, the superblock sb->s_root has been a dummy dentry with a dummy inode. This breaks ustat(), which actually uses sb->s_root in a vfstat() call. Fix this by making the s_root a dummy alias to the directory inode that was used when creating the superblock. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-09-28NFS: Fix an Oops in encode_lookup()Trond Myklebust1-0/+3
It doesn't look as if the NFS file name limit is being initialised correctly in the struct nfs_server. Make sure that we limit whatever is being set in nfs_probe_fsinfo() and nfs_init_server(). Also ensure that readdirplus and nfs4_path_walk respect our file name limits. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-09NFS: Kill the obsolete NFS_PARANOIAJesper Juhl1-1/+0
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2007-05-08header cleaning: don't include smp_lock.h when not usedRandy Dunlap1-1/+0
Remove includes of <linux/smp_lock.h> where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-03NFSv4: Don't require that NFSv4 mount paths begin with '/'Trond Myklebust1-5/+6
Addresses the regression noted in http://bugzilla.linux-nfs.org/show_bug.cgi?id=134 Also mark a couple of other regressions as requiring fixing. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2006-12-08[PATCH] rename struct namespace to struct mnt_namespaceKirill Korotaev1-1/+1
Rename 'struct namespace' to 'struct mnt_namespace' to avoid confusion with other namespaces being developped for the containers : pid, uts, ipc, etc. 'namespace' variables and attributes are also renamed to 'mnt_ns' Signed-off-by: Kirill Korotaev <dev@sw.ru> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-04Remove all inclusions of <linux/config.h>Dave Jones1-1/+0
kbuild explicitly includes this at build time. Signed-off-by: Dave Jones <davej@redhat.com>
2006-09-22NFS: Secure the roots of the NFS subtrees in a shared superblockDavid Howells1-0/+5
Invoke security_d_instantiate() on root dentries after allocating them with dentry_alloc_anon(). Normally dentry_alloc_root() would do that, but we don't call that as we don't want to assign a name to the root dentry at this point (we may discover the real name later). Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2006-09-22NFS: Share NFS superblocks per-protocol per-server per-FSIDDavid Howells1-0/+306
The attached patch makes NFS share superblocks between mounts from the same server and FSID over the same protocol. It does this by creating each superblock with a false root and returning the real root dentry in the vfsmount presented by get_sb(). The root dentry set starts off as an anonymous dentry if we don't already have the dentry for its inode, otherwise it simply returns the dentry we already have. We may thus end up with several trees of dentries in the superblock, and if at some later point one of anonymous tree roots is discovered by normal filesystem activity to be located in another tree within the superblock, the anonymous root is named and materialises attached to the second tree at the appropriate point. Why do it this way? Why not pass an extra argument to the mount() syscall to indicate the subpath and then pathwalk from the server root to the desired directory? You can't guarantee this will work for two reasons: (1) The root and intervening nodes may not be accessible to the client. With NFS2 and NFS3, for instance, mountd is called on the server to get the filehandle for the tip of a path. mountd won't give us handles for anything we don't have permission to access, and so we can't set up NFS inodes for such nodes, and so can't easily set up dentries (we'd have to have ghost inodes or something). With this patch we don't actually create dentries until we get handles from the server that we can use to set up their inodes, and we don't actually bind them into the tree until we know for sure where they go. (2) Inaccessible symbolic links. If we're asked to mount two exports from the server, eg: mount warthog:/warthog/aaa/xxx /mmm mount warthog:/warthog/bbb/yyy /nnn We may not be able to access anything nearer the root than xxx and yyy, but we may find out later that /mmm/www/yyy, say, is actually the same directory as the one mounted on /nnn. What we might then find out, for example, is that /warthog/bbb was actually a symbolic link to /warthog/aaa/xxx/www, but we can't actually determine that by talking to the server until /warthog is made available by NFS. This would lead to having constructed an errneous dentry tree which we can't easily fix. We can end up with a dentry marked as a directory when it should actually be a symlink, or we could end up with an apparently hardlinked directory. With this patch we need not make assumptions about the type of a dentry for which we can't retrieve information, nor need we assume we know its place in the grand scheme of things until we actually see that place. This patch reduces the possibility of aliasing in the inode and page caches for inodes that may be accessed by more than one NFS export. It also reduces the number of superblocks required for NFS where there are many NFS exports being used from a server (home directory server + autofs for example). This in turn makes it simpler to do local caching of network filesystems, as it can then be guaranteed that there won't be links from multiple inodes in separate superblocks to the same cache file. Obviously, cache aliasing between different levels of NFS protocol could still be a problem, but at least that gives us another key to use when indexing the cache. This patch makes the following changes: (1) The server record construction/destruction has been abstracted out into its own set of functions to make things easier to get right. These have been moved into fs/nfs/client.c. All the code in fs/nfs/client.c has to do with the management of connections to servers, and doesn't touch superblocks in any way; the remaining code in fs/nfs/super.c has to do with VFS superblock management. (2) The sequence of events undertaken by NFS mount is now reordered: (a) A volume representation (struct nfs_server) is allocated. (b) A server representation (struct nfs_client) is acquired. This may be allocated or shared, and is keyed on server address, port and NFS version. (c) If allocated, the client representation is initialised. The state member variable of nfs_client is used to prevent a race during initialisation from two mounts. (d) For NFS4 a simple pathwalk is performed, walking from FH to FH to find the root filehandle for the mount (fs/nfs/getroot.c). For NFS2/3 we are given the root FH in advance. (e) The volume FSID is probed for on the root FH. (f) The volume representation is initialised from the FSINFO record retrieved on the root FH. (g) sget() is called to acquire a superblock. This may be allocated or shared, keyed on client pointer and FSID. (h) If allocated, the superblock is initialised. (i) If the superblock is shared, then the new nfs_server record is discarded. (j) The root dentry for this mount is looked up from the root FH. (k) The root dentry for this mount is assigned to the vfsmount. (3) nfs_readdir_lookup() creates dentries for each of the entries readdir() returns; this function now attaches disconnected trees from alternate roots that happen to be discovered attached to a directory being read (in the same way nfs_lookup() is made to do for lookup ops). The new d_materialise_unique() function is now used to do this, thus permitting the whole thing to be done under one set of locks, and thus avoiding any race between mount and lookup operations on the same directory. (4) The client management code uses a new debug facility: NFSDBG_CLIENT which is set by echoing 1024 to /proc/net/sunrpc/nfs_debug. (5) Clone mounts are now called xdev mounts. (6) Use the dentry passed to the statfs() op as the handle for retrieving fs statistics rather than the root dentry of the superblock (which is now a dummy). Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 21:45:17 +0000