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Replace pid_t in autofs with struct pid reference

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Make autofs container-friendly by caching struct pid reference rather than
pid_t and using pid_nr() to retreive a task's pid_t.

ChangeLog:
	- Fix Eric Biederman's comments - Use find_get_pid() to hold a
	  reference to oz_pgrp and release while unmounting; separate out
	  changes to autofs and autofs4.
	- Fix Cedric's comments: retain old prototype of parse_options()
	  and move necessary change to its caller.

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: containers@lists.osdl.org
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sukadev Bhattiprolu 2007-05-10 22:23:08 -07:00 committed by Linus Torvalds
parent d78e53c89a
commit fa0334f19f
3 changed files with 22 additions and 8 deletions
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4
fs/autofs/autofs_i.h
View file

@ -101,7 +101,7 @@ struct autofs_symlink {
struct autofs_sb_info {
u32 magic;
struct file *pipe;
pid_t oz_pgrp;
struct pid *oz_pgrp;
int catatonic;
struct super_block *sb;
unsigned long exp_timeout;
@ -122,7 +122,7 @@ static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
filesystem without "magic".) */
static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {
return sbi->catatonic || process_group(current) == sbi->oz_pgrp;
return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp;
}
/* Hash operations */

20
fs/autofs/inode.c
View file

@ -37,6 +37,8 @@ void autofs_kill_sb(struct super_block *sb)
if (!sbi->catatonic)
autofs_catatonic_mode(sbi); /* Free wait queues, close pipe */
put_pid(sbi->oz_pgrp);
autofs_hash_nuke(sbi);
for (n = 0; n < AUTOFS_MAX_SYMLINKS; n++) {
if (test_bit(n, sbi->symlink_bitmap))
@ -139,6 +141,7 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
int pipefd;
struct autofs_sb_info *sbi;
int minproto, maxproto;
pid_t pgid;
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
@ -150,7 +153,6 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
sbi->pipe = NULL;
sbi->catatonic = 1;
sbi->exp_timeout = 0;
sbi->oz_pgrp = process_group(current);
autofs_initialize_hash(&sbi->dirhash);
sbi->queues = NULL;
memset(sbi->symlink_bitmap, 0, sizeof(long)*AUTOFS_SYMLINK_BITMAP_LEN);
@ -171,7 +173,7 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
/* Can this call block? - WTF cares? s is locked. */
if (parse_options(data, &pipefd, &root_inode->i_uid,
&root_inode->i_gid, &sbi->oz_pgrp, &minproto,
&root_inode->i_gid, &pgid, &minproto,
&maxproto)) {
printk("autofs: called with bogus options\n");
goto fail_dput;
@ -184,13 +186,21 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
goto fail_dput;
}
DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp));
DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, pgid));
sbi->oz_pgrp = find_get_pid(pgid);
if (!sbi->oz_pgrp) {
printk("autofs: could not find process group %d\n", pgid);
goto fail_dput;
}
pipe = fget(pipefd);
if (!pipe) {
printk("autofs: could not open pipe file descriptor\n");
goto fail_dput;
goto fail_put_pid;
}
if (!pipe->f_op || !pipe->f_op->write)
goto fail_fput;
sbi->pipe = pipe;
@ -205,6 +215,8 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
fail_fput:
printk("autofs: pipe file descriptor does not contain proper ops\n");
fput(pipe);
fail_put_pid:
put_pid(sbi->oz_pgrp);
fail_dput:
dput(root);
goto fail_free;

6
fs/autofs/root.c
View file

@ -213,8 +213,10 @@ static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentr
sbi = autofs_sbi(dir->i_sb);
oz_mode = autofs_oz_mode(sbi);
DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n",
current->pid, process_group(current), sbi->catatonic, oz_mode));
DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, "
"oz_mode = %d\n", pid_nr(task_pid(current)),
process_group(current), sbi->catatonic,
oz_mode));
/*
* Mark the dentry incomplete, but add it. This is needed so