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NFS: Fix the fsid revalidation in nfs_update_inode() 

When we detect that we've crossed a mountpoint on the remote server, we
must take care not to use that inode to revalidate the fsid on our
current superblock. To do so, we label the inode as a remote mountpoint,
and check for that in nfs_update_inode().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-03-06 12:34:50 -05:00
parent ee1a2c564f
commit c37dcd334c
2 changed files with 5 additions and 2 deletions
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6
fs/nfs/inode.c
View File

@ -299,6 +299,7 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
else else
inode->i_op = &nfs_mountpoint_inode_operations; inode->i_op = &nfs_mountpoint_inode_operations;
inode->i_fop = NULL; inode->i_fop = NULL;
set_bit(NFS_INO_MOUNTPOINT, &nfsi->flags);
} }
} else if (S_ISLNK(inode->i_mode)) } else if (S_ISLNK(inode->i_mode))
inode->i_op = &nfs_symlink_inode_operations; inode->i_op = &nfs_symlink_inode_operations;
@ -1003,8 +1004,9 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
server = NFS_SERVER(inode); server = NFS_SERVER(inode);
/* Update the fsid? */ /* Update the fsid? */
if (S_ISDIR(inode->i_mode) if (S_ISDIR(inode->i_mode) &&
&& !nfs_fsid_equal(&server->fsid, &fattr->fsid)) !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
!test_bit(NFS_INO_MOUNTPOINT, &nfsi->flags))
server->fsid = fattr->fsid; server->fsid = fattr->fsid;
/* /*

1
include/linux/nfs_fs.h
View File

@ -195,6 +195,7 @@ struct nfs_inode {
#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */ #define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
#define NFS_INO_STALE (2) /* possible stale inode */ #define NFS_INO_STALE (2) /* possible stale inode */
#define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */ #define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
#define NFS_INO_MOUNTPOINT (4) /* inode is remote mountpoint */
static inline struct nfs_inode *NFS_I(const struct inode *inode) static inline struct nfs_inode *NFS_I(const struct inode *inode)
{ {