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cifs: add refcounted and timestamped container for holding tcons

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Eventually, we'll need to track the use of tcons on a per-sb basis, so that
we know when it's ok to tear them down. Begin this conversion by adding a
new "tcon_link" struct and accessors that get it. For now, the core data
structures are untouched -- cifs_sb still just points to a single tcon and
the pointers are just cast to deal with the accessor functions. A later
patch will flesh this out.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton
2010-09-29 19:51:11 -04:00
committed by Steve French
parent f3983c2133
commit 7ffec37245
9 changed files with 376 additions and 148 deletions
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60
fs/cifs/xattr.c
View File

@@ -47,9 +47,10 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
#ifdef CONFIG_CIFS_XATTR
int xid;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifsTconInfo *pTcon;
struct super_block *sb;
char *full_path;
char *full_path = NULL;
if (direntry == NULL)
return -EIO;
@@ -58,16 +59,19 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
sb = direntry->d_inode->i_sb;
if (sb == NULL)
return -EIO;
xid = GetXid();
cifs_sb = CIFS_SB(sb);
pTcon = cifs_sb_tcon(cifs_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
pTcon = tlink_tcon(tlink);
xid = GetXid();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
FreeXid(xid);
return rc;
goto remove_ea_exit;
}
if (ea_name == NULL) {
cFYI(1, "Null xattr names not supported");
@@ -91,6 +95,7 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
remove_ea_exit:
kfree(full_path);
FreeXid(xid);
cifs_put_tlink(tlink);
#endif
return rc;
}
@@ -102,6 +107,7 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
#ifdef CONFIG_CIFS_XATTR
int xid;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifsTconInfo *pTcon;
struct super_block *sb;
char *full_path;
@@ -113,16 +119,19 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
sb = direntry->d_inode->i_sb;
if (sb == NULL)
return -EIO;
xid = GetXid();
cifs_sb = CIFS_SB(sb);
pTcon = cifs_sb_tcon(cifs_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
pTcon = tlink_tcon(tlink);
xid = GetXid();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
FreeXid(xid);
return rc;
goto set_ea_exit;
}
/* return dos attributes as pseudo xattr */
/* return alt name if available as pseudo attr */
@@ -132,9 +141,8 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
returns as xattrs */
if (value_size > MAX_EA_VALUE_SIZE) {
cFYI(1, "size of EA value too large");
kfree(full_path);
FreeXid(xid);
return -EOPNOTSUPP;
rc = -EOPNOTSUPP;
goto set_ea_exit;
}
if (ea_name == NULL) {
@@ -198,6 +206,7 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
set_ea_exit:
kfree(full_path);
FreeXid(xid);
cifs_put_tlink(tlink);
#endif
return rc;
}
@@ -209,6 +218,7 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
#ifdef CONFIG_CIFS_XATTR
int xid;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifsTconInfo *pTcon;
struct super_block *sb;
char *full_path;
@@ -221,16 +231,18 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
if (sb == NULL)
return -EIO;
xid = GetXid();
cifs_sb = CIFS_SB(sb);
pTcon = cifs_sb_tcon(cifs_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
pTcon = tlink_tcon(tlink);
xid = GetXid();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
FreeXid(xid);
return rc;
goto get_ea_exit;
}
/* return dos attributes as pseudo xattr */
/* return alt name if available as pseudo attr */
@@ -323,6 +335,7 @@ ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
get_ea_exit:
kfree(full_path);
FreeXid(xid);
cifs_put_tlink(tlink);
#endif
return rc;
}
@@ -333,6 +346,7 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
#ifdef CONFIG_CIFS_XATTR
int xid;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifsTconInfo *pTcon;
struct super_block *sb;
char *full_path;
@@ -346,18 +360,20 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
return -EIO;
cifs_sb = CIFS_SB(sb);
pTcon = cifs_sb_tcon(cifs_sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
return -EOPNOTSUPP;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
pTcon = tlink_tcon(tlink);
xid = GetXid();
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
FreeXid(xid);
return rc;
goto list_ea_exit;
}
/* return dos attributes as pseudo xattr */
/* return alt name if available as pseudo attr */
@@ -370,8 +386,10 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
list_ea_exit:
kfree(full_path);
FreeXid(xid);
cifs_put_tlink(tlink);
#endif
return rc;
}