From f87d39d951329cd8f462bf9007d334122c0599d0 Mon Sep 17 00:00:00 2001 From: Steve French Date: Fri, 27 May 2011 03:50:55 +0000 Subject: [PATCH] [CIFS] Migrate from prefixpath logic Now we point superblock to a server share root and set a root dentry appropriately. This let us share superblock between mounts like //server/sharename/foo/bar and //server/sharename/foo further. Reviewed-by: Jeff Layton Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/cifs_fs_sb.h | 2 - fs/cifs/cifsfs.c | 101 +++++++++++++++++++++++++++++++++- fs/cifs/cifsglob.h | 75 +++++++++++++++++++++++++ fs/cifs/cifsproto.h | 5 +- fs/cifs/connect.c | 128 ++----------------------------------------- fs/cifs/dir.c | 7 +-- fs/cifs/inode.c | 19 ++----- 7 files changed, 189 insertions(+), 148 deletions(-) diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h index a9d5692e0c20..c96b44b4e262 100644 --- a/fs/cifs/cifs_fs_sb.h +++ b/fs/cifs/cifs_fs_sb.h @@ -56,8 +56,6 @@ struct cifs_sb_info { mode_t mnt_file_mode; mode_t mnt_dir_mode; unsigned int mnt_cifs_flags; - int prepathlen; - char *prepath; /* relative path under the share to mount to */ char *mountdata; /* options received at mount time or via DFS refs */ struct backing_dev_info bdi; struct delayed_work prune_tlinks; diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 1d2a93c60e75..46fdd55cf427 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -415,8 +415,6 @@ cifs_show_options(struct seq_file *s, struct vfsmount *m) seq_printf(s, ",nocase"); if (tcon->retry) seq_printf(s, ",hard"); - if (cifs_sb->prepath) - seq_printf(s, ",prepath=%s", cifs_sb->prepath); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) seq_printf(s, ",posixpaths"); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) @@ -530,6 +528,100 @@ static const struct super_operations cifs_super_ops = { #endif }; +/* + * Get root dentry from superblock according to prefix path mount option. + * Return dentry with refcount + 1 on success and NULL otherwise. + */ +static struct dentry * +cifs_get_root(struct smb_vol *vol, struct super_block *sb) +{ + int xid, rc; + struct inode *inode; + struct qstr name; + struct dentry *dparent = NULL, *dchild = NULL, *alias; + struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + unsigned int i, full_len, len; + char *full_path = NULL, *pstart; + char sep; + + full_path = cifs_build_path_to_root(vol, cifs_sb, + cifs_sb_master_tcon(cifs_sb)); + if (full_path == NULL) + return NULL; + + cFYI(1, "Get root dentry for %s", full_path); + + xid = GetXid(); + sep = CIFS_DIR_SEP(cifs_sb); + dparent = dget(sb->s_root); + full_len = strlen(full_path); + full_path[full_len] = sep; + pstart = full_path + 1; + + for (i = 1, len = 0; i <= full_len; i++) { + if (full_path[i] != sep || !len) { + len++; + continue; + } + + full_path[i] = 0; + cFYI(1, "get dentry for %s", pstart); + + name.name = pstart; + name.len = len; + name.hash = full_name_hash(pstart, len); + dchild = d_lookup(dparent, &name); + if (dchild == NULL) { + cFYI(1, "not exists"); + dchild = d_alloc(dparent, &name); + if (dchild == NULL) { + dput(dparent); + dparent = NULL; + goto out; + } + } + + cFYI(1, "get inode"); + if (dchild->d_inode == NULL) { + cFYI(1, "not exists"); + inode = NULL; + if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext) + rc = cifs_get_inode_info_unix(&inode, full_path, + sb, xid); + else + rc = cifs_get_inode_info(&inode, full_path, + NULL, sb, xid, NULL); + if (rc) { + dput(dchild); + dput(dparent); + dparent = NULL; + goto out; + } + alias = d_materialise_unique(dchild, inode); + if (alias != NULL) { + dput(dchild); + if (IS_ERR(alias)) { + dput(dparent); + dparent = NULL; + goto out; + } + dchild = alias; + } + } + cFYI(1, "parent %p, child %p", dparent, dchild); + + dput(dparent); + dparent = dchild; + len = 0; + pstart = full_path + i + 1; + full_path[i] = sep; + } +out: + _FreeXid(xid); + kfree(full_path); + return dparent; +} + static struct dentry * cifs_do_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) @@ -585,7 +677,10 @@ cifs_do_mount(struct file_system_type *fs_type, sb->s_flags |= MS_ACTIVE; - root = dget(sb->s_root); + root = cifs_get_root(volume_info, sb); + if (root == NULL) + goto out_super; + cFYI(1, "dentry root is: %p", root); goto out; out_super: diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 30699d9378e9..68ec457f8476 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -155,6 +155,61 @@ struct cifs_cred { ***************************************************************** */ +struct smb_vol { + char *username; + char *password; + char *domainname; + char *UNC; + char *UNCip; + char *iocharset; /* local code page for mapping to and from Unicode */ + char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */ + char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */ + uid_t cred_uid; + uid_t linux_uid; + gid_t linux_gid; + mode_t file_mode; + mode_t dir_mode; + unsigned secFlg; + bool retry:1; + bool intr:1; + bool setuids:1; + bool override_uid:1; + bool override_gid:1; + bool dynperm:1; + bool noperm:1; + bool no_psx_acl:1; /* set if posix acl support should be disabled */ + bool cifs_acl:1; + bool no_xattr:1; /* set if xattr (EA) support should be disabled*/ + bool server_ino:1; /* use inode numbers from server ie UniqueId */ + bool direct_io:1; + bool strict_io:1; /* strict cache behavior */ + bool remap:1; /* set to remap seven reserved chars in filenames */ + bool posix_paths:1; /* unset to not ask for posix pathnames. */ + bool no_linux_ext:1; + bool sfu_emul:1; + bool nullauth:1; /* attempt to authenticate with null user */ + bool nocase:1; /* request case insensitive filenames */ + bool nobrl:1; /* disable sending byte range locks to srv */ + bool mand_lock:1; /* send mandatory not posix byte range lock reqs */ + bool seal:1; /* request transport encryption on share */ + bool nodfs:1; /* Do not request DFS, even if available */ + bool local_lease:1; /* check leases only on local system, not remote */ + bool noblocksnd:1; + bool noautotune:1; + bool nostrictsync:1; /* do not force expensive SMBflush on every sync */ + bool fsc:1; /* enable fscache */ + bool mfsymlinks:1; /* use Minshall+French Symlinks */ + bool multiuser:1; + unsigned int rsize; + unsigned int wsize; + bool sockopt_tcp_nodelay:1; + unsigned short int port; + unsigned long actimeo; /* attribute cache timeout (jiffies) */ + char *prepath; + struct sockaddr_storage srcaddr; /* allow binding to a local IP */ + struct nls_table *local_nls; +}; + struct TCP_Server_Info { struct list_head tcp_ses_list; struct list_head smb_ses_list; @@ -517,6 +572,26 @@ static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) return '\\'; } +static inline void +convert_delimiter(char *path, char delim) +{ + int i; + char old_delim; + + if (path == NULL) + return; + + if (delim == '/') + old_delim = '\\'; + else + old_delim = '/'; + + for (i = 0; path[i] != '\0'; i++) { + if (path[i] == old_delim) + path[i] = delim; + } +} + #ifdef CONFIG_CIFS_STATS #define cifs_stats_inc atomic_inc diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index eb3b58d9668f..e41f6071cdd2 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -57,8 +57,9 @@ extern int init_cifs_idmap(void); extern void exit_cifs_idmap(void); extern void cifs_destroy_idmaptrees(void); extern char *build_path_from_dentry(struct dentry *); -extern char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb, - struct cifsTconInfo *tcon); +extern char *cifs_build_path_to_root(struct smb_vol *vol, + struct cifs_sb_info *cifs_sb, + struct cifsTconInfo *tcon); extern char *build_wildcard_path_from_dentry(struct dentry *direntry); extern char *cifs_compose_mount_options(const char *sb_mountdata, const char *fullpath, const struct dfs_info3_param *ref, diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 581654fb174d..495688115988 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -57,61 +57,6 @@ extern mempool_t *cifs_req_poolp; -struct smb_vol { - char *username; - char *password; - char *domainname; - char *UNC; - char *UNCip; - char *iocharset; /* local code page for mapping to and from Unicode */ - char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */ - char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */ - uid_t cred_uid; - uid_t linux_uid; - gid_t linux_gid; - mode_t file_mode; - mode_t dir_mode; - unsigned secFlg; - bool retry:1; - bool intr:1; - bool setuids:1; - bool override_uid:1; - bool override_gid:1; - bool dynperm:1; - bool noperm:1; - bool no_psx_acl:1; /* set if posix acl support should be disabled */ - bool cifs_acl:1; - bool no_xattr:1; /* set if xattr (EA) support should be disabled*/ - bool server_ino:1; /* use inode numbers from server ie UniqueId */ - bool direct_io:1; - bool strict_io:1; /* strict cache behavior */ - bool remap:1; /* set to remap seven reserved chars in filenames */ - bool posix_paths:1; /* unset to not ask for posix pathnames. */ - bool no_linux_ext:1; - bool sfu_emul:1; - bool nullauth:1; /* attempt to authenticate with null user */ - bool nocase:1; /* request case insensitive filenames */ - bool nobrl:1; /* disable sending byte range locks to srv */ - bool mand_lock:1; /* send mandatory not posix byte range lock reqs */ - bool seal:1; /* request transport encryption on share */ - bool nodfs:1; /* Do not request DFS, even if available */ - bool local_lease:1; /* check leases only on local system, not remote */ - bool noblocksnd:1; - bool noautotune:1; - bool nostrictsync:1; /* do not force expensive SMBflush on every sync */ - bool fsc:1; /* enable fscache */ - bool mfsymlinks:1; /* use Minshall+French Symlinks */ - bool multiuser:1; - unsigned int rsize; - unsigned int wsize; - bool sockopt_tcp_nodelay:1; - unsigned short int port; - unsigned long actimeo; /* attribute cache timeout (jiffies) */ - char *prepath; - struct sockaddr_storage srcaddr; /* allow binding to a local IP */ - struct nls_table *local_nls; -}; - /* FIXME: should these be tunable? */ #define TLINK_ERROR_EXPIRE (1 * HZ) #define TLINK_IDLE_EXPIRE (600 * HZ) @@ -2569,12 +2514,6 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon, CIFS_MOUNT_POSIX_PATHS; } - /* We might be setting the path sep back to a different - form if we are reconnecting and the server switched its - posix path capability for this share */ - if (sb && (CIFS_SB(sb)->prepathlen > 0)) - CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb)); - if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) { if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) { CIFS_SB(sb)->rsize = 127 * 1024; @@ -2619,26 +2558,6 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon, } } -static void -convert_delimiter(char *path, char delim) -{ - int i; - char old_delim; - - if (path == NULL) - return; - - if (delim == '/') - old_delim = '\\'; - else - old_delim = '/'; - - for (i = 0; path[i] != '\0'; i++) { - if (path[i] == old_delim) - path[i] = delim; - } -} - void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, struct cifs_sb_info *cifs_sb) { @@ -2659,18 +2578,6 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, /* Windows ME may prefer this */ cFYI(1, "readsize set to minimum: 2048"); } - /* calculate prepath */ - cifs_sb->prepath = pvolume_info->prepath; - if (cifs_sb->prepath) { - cifs_sb->prepathlen = strlen(cifs_sb->prepath); - /* we can not convert the / to \ in the path - separators in the prefixpath yet because we do not - know (until reset_cifs_unix_caps is called later) - whether POSIX PATH CAP is available. We normalize - the / to \ after reset_cifs_unix_caps is called */ - pvolume_info->prepath = NULL; - } else - cifs_sb->prepathlen = 0; cifs_sb->mnt_uid = pvolume_info->linux_uid; cifs_sb->mnt_gid = pvolume_info->linux_gid; cifs_sb->mnt_file_mode = pvolume_info->file_mode; @@ -2834,24 +2741,13 @@ build_unc_path_to_root(const struct smb_vol *volume_info, char *full_path; int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1); - full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL); + full_path = kmalloc(unc_len + 1, GFP_KERNEL); if (full_path == NULL) return ERR_PTR(-ENOMEM); strncpy(full_path, volume_info->UNC, unc_len); - if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) { - int i; - for (i = 0; i < unc_len; i++) { - if (full_path[i] == '\\') - full_path[i] = '/'; - } - } - - if (cifs_sb->prepathlen) - strncpy(full_path + unc_len, cifs_sb->prepath, - cifs_sb->prepathlen); - - full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */ + full_path[unc_len] = 0; /* add trailing null */ + convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); return full_path; } @@ -3049,10 +2945,6 @@ try_mount_again: CIFSSMBQFSAttributeInfo(xid, tcon); } - /* convert forward to back slashes in prepath here if needed */ - if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0) - convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb)); - if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) { cifs_sb->rsize = 1024 * 127; cFYI(DBG2, "no very large read support, rsize now 127K"); @@ -3082,10 +2974,10 @@ remote_path_check: } #endif - /* check if a whole path (including prepath) is not remote */ + /* check if a whole path is not remote */ if (!rc && tcon) { /* build_path_to_root works only when we have a valid tcon */ - full_path = cifs_build_path_to_root(cifs_sb, tcon); + full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon); if (full_path == NULL) { rc = -ENOMEM; goto mount_fail_check; @@ -3111,10 +3003,6 @@ remote_path_check: rc = -ELOOP; goto mount_fail_check; } - /* convert forward to back slashes in prepath here if needed */ - if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0) - convert_delimiter(cifs_sb->prepath, - CIFS_DIR_SEP(cifs_sb)); rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb, true); @@ -3340,7 +3228,6 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb) struct rb_root *root = &cifs_sb->tlink_tree; struct rb_node *node; struct tcon_link *tlink; - char *tmp; cancel_delayed_work_sync(&cifs_sb->prune_tlinks); @@ -3357,11 +3244,6 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb) } spin_unlock(&cifs_sb->tlink_tree_lock); - tmp = cifs_sb->prepath; - cifs_sb->prepathlen = 0; - cifs_sb->prepath = NULL; - kfree(tmp); - return 0; } diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index 0521492f5b3b..aa0669a82922 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -50,7 +50,6 @@ build_path_from_dentry(struct dentry *direntry) { struct dentry *temp; int namelen; - int pplen; int dfsplen; char *full_path; char dirsep; @@ -63,13 +62,12 @@ build_path_from_dentry(struct dentry *direntry) when the server crashed */ dirsep = CIFS_DIR_SEP(cifs_sb); - pplen = cifs_sb->prepathlen; if (tcon->Flags & SMB_SHARE_IS_IN_DFS) dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); else dfsplen = 0; cifs_bp_rename_retry: - namelen = pplen + dfsplen; + namelen = dfsplen; for (temp = direntry; !IS_ROOT(temp);) { namelen += (1 + temp->d_name.len); temp = temp->d_parent; @@ -100,7 +98,7 @@ cifs_bp_rename_retry: return NULL; } } - if (namelen != pplen + dfsplen) { + if (namelen != dfsplen) { cERROR(1, "did not end path lookup where expected namelen is %d", namelen); /* presumably this is only possible if racing with a rename @@ -126,7 +124,6 @@ cifs_bp_rename_retry: } } } - strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen); return full_path; } diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 5e278d37912b..53ea6250a51d 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -735,10 +735,10 @@ static const struct inode_operations cifs_ipc_inode_ops = { .lookup = cifs_lookup, }; -char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb, - struct cifsTconInfo *tcon) +char *cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb, + struct cifsTconInfo *tcon) { - int pplen = cifs_sb->prepathlen; + int pplen = vol->prepath ? strlen(vol->prepath) : 0; int dfsplen; char *full_path = NULL; @@ -772,7 +772,7 @@ char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb, } } } - strncpy(full_path + dfsplen, cifs_sb->prepath, pplen); + strncpy(full_path + dfsplen, vol->prepath, pplen); full_path[dfsplen + pplen] = 0; /* add trailing null */ return full_path; } @@ -884,19 +884,13 @@ struct inode *cifs_root_iget(struct super_block *sb) struct cifs_sb_info *cifs_sb = CIFS_SB(sb); struct inode *inode = NULL; long rc; - char *full_path; struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb); - full_path = cifs_build_path_to_root(cifs_sb, tcon); - if (full_path == NULL) - return ERR_PTR(-ENOMEM); - xid = GetXid(); if (tcon->unix_ext) - rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid); + rc = cifs_get_inode_info_unix(&inode, "", sb, xid); else - rc = cifs_get_inode_info(&inode, full_path, NULL, sb, - xid, NULL); + rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL); if (!inode) { inode = ERR_PTR(rc); @@ -922,7 +916,6 @@ struct inode *cifs_root_iget(struct super_block *sb) } out: - kfree(full_path); /* can not call macro FreeXid here since in a void func * TODO: This is no longer true */