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authorSukadev Bhattiprolu <sukadev@us.ibm.com>2008-10-13 05:43:27 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-13 12:51:43 -0400
commita6f37daa8b892fd29dd71be0de61460a478cb122 (patch)
tree158010784c65dc0183b62551058ae0ed0fa2e887 /fs/devpts/inode.c
parent89a52e109e2e2fe8bbd4e316cdb910774519c029 (diff)
Simplify devpts_pty_kill
When creating a new pty, save the pty's inode in the tty->driver_data. Use this inode in pty_kill() to identify the devpts instance. Since we now have the inode for the pty, we can skip get_node() lookup and remove the unused get_node(). TODO: - check if the mutex_lock is needed in pty_kill(). Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/devpts/inode.c')
-rw-r--r--fs/devpts/inode.c29
1 files changed, 12 insertions, 17 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 50e885f84bb0..a70d5d0890c7 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -170,14 +170,6 @@ static struct file_system_type devpts_fs_type = {
170 * to the System V naming convention 170 * to the System V naming convention
171 */ 171 */
172 172
173static struct dentry *get_node(int num)
174{
175 char s[12];
176 struct dentry *root = devpts_root;
177 mutex_lock(&root->d_inode->i_mutex);
178 return lookup_one_len(s, root, sprintf(s, "%d", num));
179}
180
181int devpts_new_index(struct inode *ptmx_inode) 173int devpts_new_index(struct inode *ptmx_inode)
182{ 174{
183 int index; 175 int index;
@@ -235,6 +227,7 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
235 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; 227 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
236 init_special_inode(inode, S_IFCHR|config.mode, device); 228 init_special_inode(inode, S_IFCHR|config.mode, device);
237 inode->i_private = tty; 229 inode->i_private = tty;
230 tty->driver_data = inode;
238 231
239 sprintf(s, "%d", number); 232 sprintf(s, "%d", number);
240 233
@@ -262,18 +255,20 @@ struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number)
262 255
263void devpts_pty_kill(struct tty_struct *tty) 256void devpts_pty_kill(struct tty_struct *tty)
264{ 257{
265 int number = tty->index; 258 struct inode *inode = tty->driver_data;
266 struct dentry *dentry = get_node(number); 259 struct dentry *dentry;
267 260
268 if (!IS_ERR(dentry)) { 261 BUG_ON(inode->i_rdev == MKDEV(TTYAUX_MAJOR, PTMX_MINOR));
269 struct inode *inode = dentry->d_inode; 262
270 if (inode) { 263 mutex_lock(&devpts_root->d_inode->i_mutex);
271 inode->i_nlink--; 264
272 d_delete(dentry); 265 dentry = d_find_alias(inode);
273 dput(dentry); 266 if (dentry && !IS_ERR(dentry)) {
274 } 267 inode->i_nlink--;
268 d_delete(dentry);
275 dput(dentry); 269 dput(dentry);
276 } 270 }
271
277 mutex_unlock(&devpts_root->d_inode->i_mutex); 272 mutex_unlock(&devpts_root->d_inode->i_mutex);
278} 273}
279 274