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Commit 74cca90e authored by Daniel Rosenberg's avatar Daniel Rosenberg Committed by Alistair Strachan
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ANDROID: vfs: Add setattr2 for filesystems with per mount permissions 



This allows filesystems to use their mount private data to
influence the permssions they use in setattr2. It has
been separated into a new call to avoid disrupting current
setattr users.

Bug: 120446149
Change-Id: I19959038309284448f1b7f232d579674ef546385
Signed-off-by: default avatarDaniel Rosenberg <drosen@google.com>
parent 8fd4c18e

fs/attr.c

+10 −2
Original line number Diff line number Diff line
@@ -223,7 +223,7 @@ EXPORT_SYMBOL(setattr_copy); 
 * the file open for write, as there can be no conflicting delegation in

 * that case.

 */

int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)

int notify_change2(struct vfsmount *mnt, struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)

{

	struct inode *inode = dentry->d_inode;

	umode_t mode = inode->i_mode;
@@ -330,7 +330,9 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de 
	if (error)

		return error;



	if (inode->i_op->setattr)

	if (mnt && inode->i_op->setattr2)

		error = inode->i_op->setattr2(mnt, dentry, attr);

	else if (inode->i_op->setattr)

		error = inode->i_op->setattr(dentry, attr);

	else

		error = simple_setattr(dentry, attr);
@@ -343,4 +345,10 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de 


	return error;

}

EXPORT_SYMBOL(notify_change2);



int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)

{

	return notify_change2(NULL, dentry, attr, delegated_inode);

}

EXPORT_SYMBOL(notify_change);

fs/coredump.c

+1 −1
Original line number Diff line number Diff line
@@ -742,7 +742,7 @@ void do_coredump(const siginfo_t *siginfo) 
			goto close_fail;

		if (!(cprm.file->f_mode & FMODE_CAN_WRITE))

			goto close_fail;

		if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file))

		if (do_truncate2(cprm.file->f_path.mnt, cprm.file->f_path.dentry, 0, 0, cprm.file))

			goto close_fail;

	}

fs/inode.c

+3 −3
Original line number Diff line number Diff line
@@ -1797,7 +1797,7 @@ int dentry_needs_remove_privs(struct dentry *dentry) 
	return mask;

}



static int __remove_privs(struct dentry *dentry, int kill)

static int __remove_privs(struct vfsmount *mnt, struct dentry *dentry, int kill)

{

	struct iattr newattrs;
@@ -1806,7 +1806,7 @@ static int __remove_privs(struct dentry *dentry, int kill) 
	 * Note we call this on write, so notify_change will not

	 * encounter any conflicting delegations:

	 */

	return notify_change(dentry, &newattrs, NULL);

	return notify_change2(mnt, dentry, &newattrs, NULL);

}



/*
@@ -1828,7 +1828,7 @@ int file_remove_privs(struct file *file) 
	if (kill < 0)

		return kill;

	if (kill)

		error = __remove_privs(dentry, kill);

		error = __remove_privs(file->f_path.mnt, dentry, kill);

	if (!error)

		inode_has_no_xattr(inode);

fs/namei.c

+1 −1
Original line number Diff line number Diff line
@@ -3005,7 +3005,7 @@ static int handle_truncate(struct file *filp) 
	if (!error)

		error = security_path_truncate(path);

	if (!error) {

		error = do_truncate(path->dentry, 0,

		error = do_truncate2(path->mnt, path->dentry, 0,

				    ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,

				    filp);

	}

fs/open.c

+16 −7
Original line number Diff line number Diff line
@@ -34,8 +34,8 @@ 


#include "internal.h"



int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,

	struct file *filp)

int do_truncate2(struct vfsmount *mnt, struct dentry *dentry, loff_t length,

		unsigned int time_attrs, struct file *filp)

{

	int ret;

	struct iattr newattrs;
@@ -60,17 +60,24 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, 


	inode_lock(dentry->d_inode);

	/* Note any delegations or leases have already been broken: */

	ret = notify_change(dentry, &newattrs, NULL);

	ret = notify_change2(mnt, dentry, &newattrs, NULL);

	inode_unlock(dentry->d_inode);

	return ret;

}

int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,

	struct file *filp)

{

	return do_truncate2(NULL, dentry, length, time_attrs, filp);

}



long vfs_truncate(const struct path *path, loff_t length)

{

	struct inode *inode;

	struct vfsmount *mnt;

	long error;



	inode = path->dentry->d_inode;

	mnt = path->mnt;



	/* For directories it's -EISDIR, for other non-regulars - -EINVAL */

	if (S_ISDIR(inode->i_mode))
@@ -106,7 +113,7 @@ long vfs_truncate(const struct path *path, loff_t length) 
	if (!error)

		error = security_path_truncate(path);

	if (!error)

		error = do_truncate(path->dentry, length, 0, NULL);

		error = do_truncate2(mnt, path->dentry, length, 0, NULL);



put_write_and_out:

	put_write_access(inode);
@@ -155,6 +162,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small) 
{

	struct inode *inode;

	struct dentry *dentry;

	struct vfsmount *mnt;

	struct fd f;

	int error;
@@ -171,6 +179,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small) 
		small = 0;



	dentry = f.file->f_path.dentry;

	mnt = f.file->f_path.mnt;

	inode = dentry->d_inode;

	error = -EINVAL;

	if (!S_ISREG(inode->i_mode) || !(f.file->f_mode & FMODE_WRITE))
@@ -191,7 +200,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small) 
	if (!error)

		error = security_path_truncate(&f.file->f_path);

	if (!error)

		error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, f.file);

		error = do_truncate2(mnt, dentry, length, ATTR_MTIME|ATTR_CTIME, f.file);

	sb_end_write(inode->i_sb);

out_putf:

	fdput(f);
@@ -538,7 +547,7 @@ static int chmod_common(const struct path *path, umode_t mode) 
		goto out_unlock;

	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);

	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;

	error = notify_change(path->dentry, &newattrs, &delegated_inode);

	error = notify_change2(path->mnt, path->dentry, &newattrs, &delegated_inode);

out_unlock:

	inode_unlock(inode);

	if (delegated_inode) {
@@ -629,7 +638,7 @@ static int chown_common(const struct path *path, uid_t user, gid_t group) 
	inode_lock(inode);

	error = security_path_chown(path, uid, gid);

	if (!error)

		error = notify_change(path->dentry, &newattrs, &delegated_inode);

		error = notify_change2(path->mnt, path->dentry, &newattrs, &delegated_inode);

	inode_unlock(inode);

	if (delegated_inode) {

		error = break_deleg_wait(&delegated_inode);