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switch do_filp_open() to struct open_flags

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take calculation of open_flags by open(2) arguments into new helper
in fs/open.c, move filp_open() over there, have it and do_sys_open()
use that helper, switch exec.c callers of do_filp_open() to explicit
(and constant) struct open_flags.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2011-02-23 17:44:09 -05:00
parent c3e380b0b3
commit 47c805dc2d
5 changed files with 101 additions and 88 deletions
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88
fs/namei.c
View File

@@ -2169,13 +2169,6 @@ exit:
return ERR_PTR(error);
}
struct open_flags {
int open_flag;
int mode;
int acc_mode;
int intent;
};
/*
* Handle O_CREAT case for do_filp_open
*/
@@ -2305,74 +2298,28 @@ exit:
* open_to_namei_flags() for more details.
*/
struct file *do_filp_open(int dfd, const char *pathname,
int open_flag, int mode, int acc_mode)
const struct open_flags *op, int flags)
{
struct file *filp;
struct nameidata nd;
int error;
struct path path;
int count = 0;
int flag = open_to_namei_flags(open_flag);
int flags = 0;
struct open_flags op;
if (!(open_flag & O_CREAT))
mode = 0;
/* Must never be set by userspace */
open_flag &= ~FMODE_NONOTIFY;
/*
* O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only
* check for O_DSYNC if the need any syncing at all we enforce it's
* always set instead of having to deal with possibly weird behaviour
* for malicious applications setting only __O_SYNC.
*/
if (open_flag & __O_SYNC)
open_flag |= O_DSYNC;
op.open_flag = open_flag;
if (!acc_mode)
acc_mode = MAY_OPEN | ACC_MODE(open_flag);
/* O_TRUNC implies we need access checks for write permissions */
if (open_flag & O_TRUNC)
acc_mode |= MAY_WRITE;
/* Allow the LSM permission hook to distinguish append
access from general write access. */
if (open_flag & O_APPEND)
acc_mode |= MAY_APPEND;
op.acc_mode = acc_mode;
op.intent = LOOKUP_OPEN;
if (open_flag & O_CREAT) {
op.intent |= LOOKUP_CREATE;
if (open_flag & O_EXCL)
op.intent |= LOOKUP_EXCL;
}
if (open_flag & O_DIRECTORY)
flags |= LOOKUP_DIRECTORY;
if (!(open_flag & O_NOFOLLOW))
flags |= LOOKUP_FOLLOW;
filp = get_empty_filp();
if (!filp)
return ERR_PTR(-ENFILE);
filp->f_flags = open_flag;
filp->f_flags = op->open_flag;
nd.intent.open.file = filp;
nd.intent.open.flags = flag;
nd.intent.open.create_mode = mode;
nd.intent.open.flags = open_to_namei_flags(op->open_flag);
nd.intent.open.create_mode = op->mode;
if (open_flag & O_CREAT)
if (op->open_flag & O_CREAT)
goto creat;
/* !O_CREAT, simple open */
error = do_path_lookup(dfd, pathname, flags | op.intent, &nd);
error = do_path_lookup(dfd, pathname, flags | op->intent, &nd);
if (unlikely(error))
goto out_filp2;
error = -ELOOP;
@@ -2386,7 +2333,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
goto out_path2;
}
audit_inode(pathname, nd.path.dentry);
filp = finish_open(&nd, open_flag, acc_mode);
filp = finish_open(&nd, op->open_flag, op->acc_mode);
out2:
release_open_intent(&nd);
return filp;
@@ -2416,7 +2363,7 @@ reval:
/*
* We have the parent and last component.
*/
filp = do_last(&nd, &path, &op, pathname);
filp = do_last(&nd, &path, op, pathname);
while (unlikely(!filp)) { /* trailing symlink */
struct path link = path;
struct inode *linki = link.dentry->d_inode;
@@ -2443,7 +2390,7 @@ reval:
if (unlikely(error))
filp = ERR_PTR(error);
else
filp = do_last(&nd, &path, &op, pathname);
filp = do_last(&nd, &path, op, pathname);
if (!IS_ERR(cookie) && linki->i_op->put_link)
linki->i_op->put_link(link.dentry, &nd, cookie);
path_put(&link);
@@ -2465,23 +2412,6 @@ out_filp:
goto out;
}
/**
* filp_open - open file and return file pointer
*
* @filename: path to open
* @flags: open flags as per the open(2) second argument
* @mode: mode for the new file if O_CREAT is set, else ignored
*
* This is the helper to open a file from kernelspace if you really
* have to. But in generally you should not do this, so please move
* along, nothing to see here..
*/
struct file *filp_open(const char *filename, int flags, int mode)
{
return do_filp_open(AT_FDCWD, filename, flags, mode, 0);
}
EXPORT_SYMBOL(filp_open);
/**
* lookup_create - lookup a dentry, creating it if it doesn't exist
* @nd: nameidata info