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| author | Dave Hansen <haveblue@us.ibm.com> | 2008-02-15 14:37:56 -0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-04-19 00:29:27 -0400 |
| commit | 2c463e95480829a2fe8f386589516e13b1289db6 (patch) | |
| tree | 7294d93a15f62ccc2c649ef9782b7f85ae7d1ef8 /fs/nfsd | |
| parent | ec82687f29127a954dd0da95dc1e0a4ce92b560c (diff) | |
| download | linux-3.10-2c463e95480829a2fe8f386589516e13b1289db6.tar.gz linux-3.10-2c463e95480829a2fe8f386589516e13b1289db6.tar.bz2 linux-3.10-2c463e95480829a2fe8f386589516e13b1289db6.zip | |
[PATCH] r/o bind mounts: check mnt instead of superblock directly
If we depend on the inodes for writeability, we will not catch the r/o mounts
when implemented.
This patches uses __mnt_want_write(). It does not guarantee that the mount
will stay writeable after the check. But, this is OK for one of the checks
because it is just for a printk().
The other two are probably unnecessary and duplicate existing checks in the
VFS. This won't make them better checks than before, but it will make them
detect r/o mounts.
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/vfs.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 626dfd38528..304bf5f643c 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1912,7 +1912,7 @@ nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, inode->i_mode, IS_IMMUTABLE(inode)? " immut" : "", IS_APPEND(inode)? " append" : "", - IS_RDONLY(inode)? " ro" : ""); + __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); dprintk(" owner %d/%d user %d/%d\n", inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); #endif @@ -1923,7 +1923,8 @@ nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, */ if (!(acc & MAY_LOCAL_ACCESS)) if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { - if (exp_rdonly(rqstp, exp) || IS_RDONLY(inode)) + if (exp_rdonly(rqstp, exp) || + __mnt_is_readonly(exp->ex_path.mnt)) return nfserr_rofs; if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) return nfserr_perm; |