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Red Hat Bugzilla – Attachment 155802 Details for
Bug 209964
NFS Client R/O in anaconda preinstall environment
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[patch]
Purposed Upstream patch for mount.nfs
mount-nfs-nosharecache.patch (text/plain), 5.95 KB, created by
Steve Dickson
on 2007-05-31 12:27:56 UTC
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Description:
Purposed Upstream patch for mount.nfs
Filename:
MIME Type:
Creator:
Steve Dickson
Created:
2007-05-31 12:27:56 UTC
Size:
5.95 KB
patch
obsolete
>From: Trond Myklebust <Trond.Myklebust@netapp.com> > >Adds support for the 'nosharecache' mount option to nfs-utils. > >Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> >--- > > utils/mount/nfs.man | 34 ++++++++++++++++++++++++++++++++++ > utils/mount/nfs4_mount.h | 1 + > utils/mount/nfs4mount.c | 14 ++++++++++---- > utils/mount/nfs_mount.h | 1 + > utils/mount/nfsmount.c | 4 ++++ > 5 files changed, 50 insertions(+), 4 deletions(-) > >diff --git a/utils/mount/nfs.man b/utils/mount/nfs.man >index 673556c..e66daba 100644 >--- a/utils/mount/nfs.man >+++ b/utils/mount/nfs.man >@@ -288,6 +288,23 @@ Mount the NFS filesystem using the UDP protocol. > Disables NFSv3 READDIRPLUS RPCs. Use this option when > mounting servers that don't support or have broken > READDIRPLUS implementations. >+.TP 1.5i >+.I nosharecache >+As of kernel 2.6.18, it is no longer possible to mount the same >+same filesystem with different mount options to a new mountpoint. >+It was deemed unsafe to do so, since cached data cannot be shared >+between the two mountpoints. In consequence, files or directories >+that were common to both mountpoint subtrees could often be seen to >+be out of sync following an update. >+.br >+This option allows administrators to select the pre-2.6.18 behaviour, >+permitting the same filesystem to be mounted with different mount >+options. >+.br >+.B Beware: >+Use of this option is not recommended unless you are certain that there >+are no hard links or subtrees of this mountpoint that are mounted >+elsewhere. > .P > All of the non-value options have corresponding nooption forms. > For example, nointr means don't allow file operations to be >@@ -444,6 +461,23 @@ This extracts a > server performance penalty but it allows two different NFS clients > to get reasonable good results when both clients are actively > writing to common filesystem on the server. >+.TP 1.5i >+.I nosharecache >+As of kernel 2.6.18, it is no longer possible to mount the same >+same filesystem with different mount options to a new mountpoint. >+It was deemed unsafe to do so, since cached data cannot be shared >+between the two mountpoints. In consequence, files or directories >+that were common to both mountpoint subtrees could often be seen to >+be out of sync following an update. >+.br >+This option allows administrators to select the pre-2.6.18 behaviour, >+permitting the same filesystem to be mounted with different mount >+options. >+.br >+.B Beware: >+Use of this option is not recommended unless you are certain that there >+are no hard links or subtrees of this mountpoint that are mounted >+elsewhere. > .P > All of the non-value options have corresponding nooption forms. > For example, nointr means don't allow file operations to be >diff --git a/utils/mount/nfs4_mount.h b/utils/mount/nfs4_mount.h >index 74c9b95..2fcca6d 100644 >--- a/utils/mount/nfs4_mount.h >+++ b/utils/mount/nfs4_mount.h >@@ -65,6 +65,7 @@ struct nfs4_mount_data { > #define NFS4_MOUNT_NOCTO 0x0010 /* 1 */ > #define NFS4_MOUNT_NOAC 0x0020 /* 1 */ > #define NFS4_MOUNT_STRICTLOCK 0x1000 /* 1 */ >+#define NFS4_MOUNT_UNSHARED 0x8000 /* 5 */ > #define NFS4_MOUNT_FLAGMASK 0xFFFF > > /* pseudoflavors: */ >diff --git a/utils/mount/nfs4mount.c b/utils/mount/nfs4mount.c >index 2a58d0a..0376f32 100644 >--- a/utils/mount/nfs4mount.c >+++ b/utils/mount/nfs4mount.c >@@ -201,7 +201,7 @@ int nfs4mount(const char *spec, const char *node, int *flags, > char *s; > int val; > int bg, soft, intr; >- int nocto, noac; >+ int nocto, noac, unshared; > int retry; > int retval; > time_t timeout, t; >@@ -252,6 +252,7 @@ int nfs4mount(const char *spec, const char *node, int *flags, > intr = NFS4_MOUNT_INTR; > nocto = 0; > noac = 0; >+ unshared = 0; > retry = 10000; /* 10000 minutes ~ 1 week */ > > /* >@@ -336,6 +337,8 @@ int nfs4mount(const char *spec, const char *node, int *flags, > nocto = !val; > else if (!strcmp(opt, "ac")) > noac = !val; >+ else if (!strcmp(opt, "sharecache")) >+ unshared = !val; > else if (!sloppy) { > printf(_("unknown nfs mount option: " > "%s%s\n"), val ? "" : "no", opt); >@@ -347,7 +350,8 @@ int nfs4mount(const char *spec, const char *node, int *flags, > data.flags = (soft ? NFS4_MOUNT_SOFT : 0) > | (intr ? NFS4_MOUNT_INTR : 0) > | (nocto ? NFS4_MOUNT_NOCTO : 0) >- | (noac ? NFS4_MOUNT_NOAC : 0); >+ | (noac ? NFS4_MOUNT_NOAC : 0) >+ | (unshared ? NFS4_MOUNT_UNSHARED : 0); > > /* > * Give a warning if the rpc.idmapd daemon is not running >@@ -388,11 +392,13 @@ int nfs4mount(const char *spec, const char *node, int *flags, > data.acregmin, data.acregmax, data.acdirmin, data.acdirmax); > printf("port = %d, bg = %d, retry = %d, flags = %.8x\n", > ntohs(server_addr.sin_port), bg, retry, data.flags); >- printf("soft = %d, intr = %d, nocto = %d, noac = %d\n", >+ printf("soft = %d, intr = %d, nocto = %d, noac = %d, " >+ "nosharecache = %d\n", > (data.flags & NFS4_MOUNT_SOFT) != 0, > (data.flags & NFS4_MOUNT_INTR) != 0, > (data.flags & NFS4_MOUNT_NOCTO) != 0, >- (data.flags & NFS4_MOUNT_NOAC) != 0); >+ (data.flags & NFS4_MOUNT_NOAC) != 0, >+ (data.flags & NFS4_MOUNT_UNSHARED) != 0); > > if (num_flavour > 0) { > int pf_cnt, i; >diff --git a/utils/mount/nfs_mount.h b/utils/mount/nfs_mount.h >index 4a061d8..50ce2a8 100644 >--- a/utils/mount/nfs_mount.h >+++ b/utils/mount/nfs_mount.h >@@ -64,6 +64,7 @@ struct nfs_mount_data { > #define NFS_MOUNT_NOACL 0x0800 /* 4 */ > #define NFS_MOUNT_SECFLAVOUR 0x2000 /* 5 */ > #define NFS_MOUNT_NORDIRPLUS 0x4000 /* 5 */ >+#define NFS_MOUNT_UNSHARED 0x8000 /* 5 */ > > /* security pseudoflavors */ > >diff --git a/utils/mount/nfsmount.c b/utils/mount/nfsmount.c >index 815064a..f21aaff 100644 >--- a/utils/mount/nfsmount.c >+++ b/utils/mount/nfsmount.c >@@ -804,6 +804,10 @@ parse_options(char *old_opts, struct nfs_mount_data *data, > data->flags &= ~NFS_MOUNT_NORDIRPLUS; > if (!val) > data->flags |= NFS_MOUNT_NORDIRPLUS; >+ } else if (!strcmp(opt, "sharecache")) { >+ data->flags &= ~NFS_MOUNT_UNSHARED; >+ if (!val) >+ data->flags |= NFS_MOUNT_UNSHARED; > #endif > } else { > bad_option: >
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bug 209964
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138025
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155801
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155803
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155804