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Fix the -ESTALE handling in do_filp_open()

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Instead of playing sick games with path saving, cleanups, just retry
the entire thing once with LOOKUP_REVAL added.  Post-.34 we'll convert
all -ESTALE handling in there to that style, rather than playing with
many retry loops deep in the call chain.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-01-13 15:01:15 -05:00
parent 806892e9e1
commit 9850c05655
1 changed files with 9 additions and 11 deletions
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20
fs/namei.c
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@ -1604,11 +1604,12 @@ struct file *do_filp_open(int dfd, const char *pathname,
struct file *filp;
struct nameidata nd;
int error;
struct path path, save;
struct path path;
struct dentry *dir;
int count = 0;
int will_truncate;
int flag = open_to_namei_flags(open_flag);
int force_reval = 0;
/*
* O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only
@ -1660,9 +1661,12 @@ struct file *do_filp_open(int dfd, const char *pathname,
/*
* Create - we need to know the parent.
*/
reval:
error = path_init(dfd, pathname, LOOKUP_PARENT, &nd);
if (error)
return ERR_PTR(error);
if (force_reval)
nd.flags |= LOOKUP_REVAL;
error = path_walk(pathname, &nd);
if (error) {
if (nd.root.mnt)
@ -1854,17 +1858,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
error = security_inode_follow_link(path.dentry, &nd);
if (error)
goto exit_dput;
save = nd.path;
path_get(&save);
error = __do_follow_link(&path, &nd);
if (error == -ESTALE) {
/* nd.path had been dropped */
nd.path = save;
path_get(&nd.path);
nd.flags |= LOOKUP_REVAL;
error = __do_follow_link(&path, &nd);
}
path_put(&save);
path_put(&path);
if (error) {
/* Does someone understand code flow here? Or it is only
@ -1874,6 +1868,10 @@ struct file *do_filp_open(int dfd, const char *pathname,
release_open_intent(&nd);
if (nd.root.mnt)
path_put(&nd.root);
if (error == -ESTALE && !force_reval) {
force_reval = 1;
goto reval;
}
return ERR_PTR(error);
}
nd.flags &= ~LOOKUP_PARENT;