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[CIFS] Enable DFS support for Unix query path info

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Final piece for handling DFS in unix_query_path_info, constructing a
fake inode for the junction directory which the submount will cover.

Acked-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French
2008-05-20 19:50:46 +00:00
parent 89562b777c
commit 0e4bbde94f
4 changed files with 93 additions and 58 deletions
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133
fs/cifs/inode.c
View File

@@ -161,77 +161,108 @@ static void cifs_unix_info_to_inode(struct inode *inode,
spin_unlock(&inode->i_lock);
}
static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
struct super_block *sb)
{
struct inode *pinode = NULL;
memset(pfnd_dat, sizeof(FILE_UNIX_BASIC_INFO), 0);
/* __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
__le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
__u64 UniqueId = 0; */
pfnd_dat->LastStatusChange =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastAccessTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastModificationTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
pfnd_dat->Nlinks = cpu_to_le64(2);
if (sb->s_root)
pinode = sb->s_root->d_inode;
if (pinode == NULL)
return;
/* fill in default values for the remaining based on root
inode since we can not query the server for this inode info */
pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
}
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path, struct super_block *sb, int xid)
{
int rc = 0;
FILE_UNIX_BASIC_INFO findData;
FILE_UNIX_BASIC_INFO find_data;
struct cifsTconInfo *pTcon;
struct inode *inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
bool is_dfs_referral = false;
struct cifsInodeInfo *cifsInfo;
__u64 num_of_bytes;
__u64 end_of_file;
pTcon = cifs_sb->tcon;
cFYI(1, ("Getting info on %s", full_path));
try_again_CIFSSMBUnixQPathInfo:
/* could have done a find first instead but this returns more info */
rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &findData,
rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
/* dump_mem("\nUnixQPathInfo return data", &findData,
sizeof(findData)); */
if (rc) {
if (rc == -EREMOTE && !is_dfs_referral) {
is_dfs_referral = true;
goto try_again_CIFSSMBUnixQPathInfo;
cERROR(1, ("DFS ref")); /* BB removeme BB */
/* for DFS, server does not give us real inode data */
fill_fake_finddataunix(&find_data, sb);
rc = 0;
}
goto cgiiu_exit;
} else {
struct cifsInodeInfo *cifsInfo;
__u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
__u64 end_of_file = le64_to_cpu(findData.EndOfFile);
/* get new inode */
if (*pinode == NULL) {
*pinode = new_inode(sb);
if (*pinode == NULL) {
rc = -ENOMEM;
goto cgiiu_exit;
}
/* Is an i_ino of zero legal? */
/* Are there sanity checks we can use to ensure that
the server is really filling in that field? */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
(*pinode)->i_ino =
(unsigned long)findData.UniqueId;
} /* note ino incremented to unique num in new_inode */
if (sb->s_flags & MS_NOATIME)
(*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
insert_inode_hash(*pinode);
}
inode = *pinode;
cifsInfo = CIFS_I(inode);
cFYI(1, ("Old time %ld", cifsInfo->time));
cifsInfo->time = jiffies;
cFYI(1, ("New time %ld", cifsInfo->time));
/* this is ok to set on every inode revalidate */
atomic_set(&cifsInfo->inUse, 1);
cifs_unix_info_to_inode(inode, &findData, 0);
if (num_of_bytes < end_of_file)
cFYI(1, ("allocation size less than end of file"));
cFYI(1, ("Size %ld and blocks %llu",
(unsigned long) inode->i_size,
(unsigned long long)inode->i_blocks));
cifs_set_ops(inode, is_dfs_referral);
}
num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
end_of_file = le64_to_cpu(find_data.EndOfFile);
/* get new inode */
if (*pinode == NULL) {
*pinode = new_inode(sb);
if (*pinode == NULL) {
rc = -ENOMEM;
goto cgiiu_exit;
}
/* Is an i_ino of zero legal? */
/* note ino incremented to unique num in new_inode */
/* Are there sanity checks we can use to ensure that
the server is really filling in that field? */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
(*pinode)->i_ino = (unsigned long)find_data.UniqueId;
if (sb->s_flags & MS_NOATIME)
(*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
insert_inode_hash(*pinode);
}
inode = *pinode;
cifsInfo = CIFS_I(inode);
cFYI(1, ("Old time %ld", cifsInfo->time));
cifsInfo->time = jiffies;
cFYI(1, ("New time %ld", cifsInfo->time));
/* this is ok to set on every inode revalidate */
atomic_set(&cifsInfo->inUse, 1);
cifs_unix_info_to_inode(inode, &find_data, 0);
if (num_of_bytes < end_of_file)
cFYI(1, ("allocation size less than end of file"));
cFYI(1, ("Size %ld and blocks %llu",
(unsigned long) inode->i_size,
(unsigned long long)inode->i_blocks));
cifs_set_ops(inode, is_dfs_referral);
cgiiu_exit:
return rc;
}