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cifs: Add support for follow_link on dfs shares under posix extensions
When using posix extensions, dfs shares in the dfs root show up as symlinks resulting in userland tools such as 'ls' calling readlink() on these shares. Since these are dfs shares, we end up returning -EREMOTE. $ ls -l /mnt ls: cannot read symbolic link /mnt/test: Object is remote total 0 lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test With added follow_link() support for dfs shares, when using unix extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and return the first node returned. The dfs share in the dfs root is now displayed in the following manner. $ ls -l /mnt total 0 lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
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1 changed files with 32 additions and 0 deletions
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@ -907,6 +907,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
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(__u8)type, wait, 0);
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}
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static int
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cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
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const unsigned char *searchName, char **symlinkinfo,
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const struct nls_table *nls_codepage)
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{
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#ifdef CONFIG_CIFS_DFS_UPCALL
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int rc;
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unsigned int num_referrals = 0;
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struct dfs_info3_param *referrals = NULL;
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rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
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&num_referrals, &referrals, 0);
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if (!rc && num_referrals > 0) {
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*symlinkinfo = kstrndup(referrals->node_name,
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strlen(referrals->node_name),
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GFP_KERNEL);
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if (!*symlinkinfo)
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rc = -ENOMEM;
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free_dfs_info_array(referrals, num_referrals);
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}
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return rc;
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#else /* No DFS support */
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return -EREMOTE;
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#endif
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}
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static int
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cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
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const char *full_path, char **target_path,
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@ -922,6 +949,11 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
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if (cap_unix(tcon->ses)) {
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rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
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cifs_sb->local_nls);
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if (rc == -EREMOTE)
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rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
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target_path,
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cifs_sb->local_nls);
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goto out;
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}
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