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Message-ID: <1386759161.2706.7.camel@menhir>
Date: Wed, 11 Dec 2013 10:52:41 +0000
From: Steven Whitehouse <swhiteho@...hat.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: viro@...iv.linux.org.uk,
Andreas Gruenbacher <andreas.gruenbacher@...bit.com>,
xfs@....sgi.com, reiserfs-devel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
linux-mtd@...ts.infradead.org,
jfs-discussion@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-nfs@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: [Cluster-devel] [PATCH 16/18] gfs2: use generic posix ACL
infrastructure
Hi,
On Wed, 2013-12-11 at 02:42 -0800, Christoph Hellwig wrote:
> plain text document attachment
> (0016-gfs2-use-generic-posix-ACL-infrastructure.patch)
> This contains some major refactoring for the create path so that
> inodes are created with the right mode to start with instead of
> fixing it up later.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Steven Whitehouse <swhiteho@...hat.com>
A really nice clean up - this is a very useful step forward in
simplifying the create path. Thanks for sorting this out,
Steve.
> ---
> fs/gfs2/acl.c | 234 +++++++------------------------------------------------
> fs/gfs2/acl.h | 4 +-
> fs/gfs2/inode.c | 33 ++++++--
> fs/gfs2/xattr.c | 4 +-
> 4 files changed, 62 insertions(+), 213 deletions(-)
>
> diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
> index e82e4ac..ba94566 100644
> --- a/fs/gfs2/acl.c
> +++ b/fs/gfs2/acl.c
> @@ -49,10 +49,6 @@ struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
> if (!ip->i_eattr)
> return NULL;
>
> - acl = get_cached_acl(&ip->i_inode, type);
> - if (acl != ACL_NOT_CACHED)
> - return acl;
> -
> name = gfs2_acl_name(type);
> if (name == NULL)
> return ERR_PTR(-EINVAL);
> @@ -80,7 +76,7 @@ static int gfs2_set_mode(struct inode *inode, umode_t mode)
> return error;
> }
>
> -static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
> +int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
> {
> int error;
> int len;
> @@ -88,219 +84,49 @@ static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
> const char *name = gfs2_acl_name(type);
>
> BUG_ON(name == NULL);
> - len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
> - if (len == 0)
> - return 0;
> - data = kmalloc(len, GFP_NOFS);
> - if (data == NULL)
> - return -ENOMEM;
> - error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
> - if (error < 0)
> - goto out;
> - error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
> - if (!error)
> - set_cached_acl(inode, type, acl);
> -out:
> - kfree(data);
> - return error;
> -}
> -
> -int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
> -{
> - struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
> - struct posix_acl *acl;
> - umode_t mode = inode->i_mode;
> - int error = 0;
> -
> - if (!sdp->sd_args.ar_posix_acl)
> - return 0;
> - if (S_ISLNK(inode->i_mode))
> - return 0;
> -
> - acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT);
> - if (IS_ERR(acl))
> - return PTR_ERR(acl);
> - if (!acl) {
> - mode &= ~current_umask();
> - return gfs2_set_mode(inode, mode);
> - }
> -
> - if (S_ISDIR(inode->i_mode)) {
> - error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
> - if (error)
> - goto out;
> - }
> -
> - error = __posix_acl_create(&acl, GFP_NOFS, &mode);
> - if (error < 0)
> - return error;
>
> - if (error == 0)
> - goto munge;
> -
> - error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
> - if (error)
> - goto out;
> -munge:
> - error = gfs2_set_mode(inode, mode);
> -out:
> - posix_acl_release(acl);
> - return error;
> -}
> -
> -int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
> -{
> - struct inode *inode = &ip->i_inode;
> - struct posix_acl *acl;
> - char *data;
> - unsigned int len;
> - int error;
> -
> - acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS);
> - if (IS_ERR(acl))
> - return PTR_ERR(acl);
> - if (!acl)
> - return gfs2_setattr_simple(inode, attr);
> -
> - error = __posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
> - if (error)
> - return error;
> -
> - len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
> - data = kmalloc(len, GFP_NOFS);
> - error = -ENOMEM;
> - if (data == NULL)
> - goto out;
> - posix_acl_to_xattr(&init_user_ns, acl, data, len);
> - error = gfs2_xattr_acl_chmod(ip, attr, data);
> - kfree(data);
> - set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
> -
> -out:
> - posix_acl_release(acl);
> - return error;
> -}
> -
> -static int gfs2_acl_type(const char *name)
> -{
> - if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
> - return ACL_TYPE_ACCESS;
> - if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
> - return ACL_TYPE_DEFAULT;
> - return -EINVAL;
> -}
> -
> -static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
> - void *buffer, size_t size, int xtype)
> -{
> - struct inode *inode = dentry->d_inode;
> - struct gfs2_sbd *sdp = GFS2_SB(inode);
> - struct posix_acl *acl;
> - int type;
> - int error;
> -
> - if (!sdp->sd_args.ar_posix_acl)
> - return -EOPNOTSUPP;
> -
> - type = gfs2_acl_type(name);
> - if (type < 0)
> - return type;
> -
> - acl = gfs2_get_acl(inode, type);
> - if (IS_ERR(acl))
> - return PTR_ERR(acl);
> - if (acl == NULL)
> - return -ENODATA;
> -
> - error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
> - posix_acl_release(acl);
> -
> - return error;
> -}
> -
> -static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
> - const void *value, size_t size, int flags,
> - int xtype)
> -{
> - struct inode *inode = dentry->d_inode;
> - struct gfs2_sbd *sdp = GFS2_SB(inode);
> - struct posix_acl *acl = NULL;
> - int error = 0, type;
> -
> - if (!sdp->sd_args.ar_posix_acl)
> - return -EOPNOTSUPP;
> -
> - type = gfs2_acl_type(name);
> - if (type < 0)
> - return type;
> - if (flags & XATTR_CREATE)
> - return -EINVAL;
> - if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
> - return value ? -EACCES : 0;
> - if (!uid_eq(current_fsuid(), inode->i_uid) && !capable(CAP_FOWNER))
> - return -EPERM;
> - if (S_ISLNK(inode->i_mode))
> - return -EOPNOTSUPP;
> -
> - if (!value)
> - goto set_acl;
> -
> - acl = posix_acl_from_xattr(&init_user_ns, value, size);
> - if (!acl) {
> - /*
> - * acl_set_file(3) may request that we set default ACLs with
> - * zero length -- defend (gracefully) against that here.
> - */
> - goto out;
> - }
> - if (IS_ERR(acl)) {
> - error = PTR_ERR(acl);
> - goto out;
> - }
> -
> - error = posix_acl_valid(acl);
> - if (error)
> - goto out_release;
> -
> - error = -EINVAL;
> if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
> - goto out_release;
> + return -EINVAL;
>
> if (type == ACL_TYPE_ACCESS) {
> umode_t mode = inode->i_mode;
> +
> error = posix_acl_equiv_mode(acl, &mode);
> + if (error < 0)
> + return error;
>
> - if (error <= 0) {
> - posix_acl_release(acl);
> + if (error == 0)
> acl = NULL;
>
> - if (error < 0)
> - return error;
> - }
> -
> error = gfs2_set_mode(inode, mode);
> if (error)
> - goto out_release;
> + return error;
> }
>
> -set_acl:
> - error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
> - if (!error) {
> - if (acl)
> - set_cached_acl(inode, type, acl);
> - else
> - forget_cached_acl(inode, type);
> + if (acl) {
> + len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
> + if (len == 0)
> + return 0;
> + data = kmalloc(len, GFP_NOFS);
> + if (data == NULL)
> + return -ENOMEM;
> + error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
> + if (error < 0)
> + goto out;
> + } else {
> + data = NULL;
> + len = 0;
> }
> -out_release:
> - posix_acl_release(acl);
> +
> + error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
> + if (error)
> + goto out;
> +
> + if (acl)
> + set_cached_acl(inode, type, acl);
> + else
> + forget_cached_acl(inode, type);
> out:
> + kfree(data);
> return error;
> }
> -
> -const struct xattr_handler gfs2_xattr_system_handler = {
> - .prefix = XATTR_SYSTEM_PREFIX,
> - .flags = GFS2_EATYPE_SYS,
> - .get = gfs2_xattr_system_get,
> - .set = gfs2_xattr_system_set,
> -};
> -
> diff --git a/fs/gfs2/acl.h b/fs/gfs2/acl.h
> index 0da38dc..301260c 100644
> --- a/fs/gfs2/acl.h
> +++ b/fs/gfs2/acl.h
> @@ -17,8 +17,6 @@
> #define GFS2_ACL_MAX_ENTRIES 25
>
> extern struct posix_acl *gfs2_get_acl(struct inode *inode, int type);
> -extern int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode);
> -extern int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr);
> -extern const struct xattr_handler gfs2_xattr_system_handler;
> +extern int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
>
> #endif /* __ACL_DOT_H__ */
> diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
> index 7119504..92b8959 100644
> --- a/fs/gfs2/inode.c
> +++ b/fs/gfs2/inode.c
> @@ -552,6 +552,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
> unsigned int size, int excl, int *opened)
> {
> const struct qstr *name = &dentry->d_name;
> + struct posix_acl *default_acl, *acl;
> struct gfs2_holder ghs[2];
> struct inode *inode = NULL;
> struct gfs2_inode *dip = GFS2_I(dir), *ip;
> @@ -611,10 +612,14 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
> if (!inode)
> goto fail_gunlock;
>
> + error = posix_acl_create(dir, &mode, &default_acl, &acl);
> + if (error)
> + goto fail_free_vfs_inode;
> +
> ip = GFS2_I(inode);
> error = gfs2_rs_alloc(ip);
> if (error)
> - goto fail_free_inode;
> + goto fail_free_acls;
>
> inode->i_mode = mode;
> set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
> @@ -682,7 +687,16 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
> gfs2_set_iop(inode);
> insert_inode_hash(inode);
>
> - error = gfs2_acl_create(dip, inode);
> + if (default_acl) {
> + error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
> + posix_acl_release(default_acl);
> + }
> + if (acl) {
> + if (!error)
> + error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
> + posix_acl_release(acl);
> + }
> +
> if (error)
> goto fail_gunlock3;
>
> @@ -716,6 +730,12 @@ fail_free_inode:
> if (ip->i_gl)
> gfs2_glock_put(ip->i_gl);
> gfs2_rs_delete(ip, NULL);
> +fail_free_acls:
> + if (default_acl)
> + posix_acl_release(default_acl);
> + if (acl)
> + posix_acl_release(acl);
> +fail_free_vfs_inode:
> free_inode_nonrcu(inode);
> inode = NULL;
> fail_gunlock:
> @@ -1678,10 +1698,11 @@ static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
> error = gfs2_setattr_size(inode, attr->ia_size);
> else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
> error = setattr_chown(inode, attr);
> - else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
> - error = gfs2_acl_chmod(ip, attr);
> - else
> + else {
> error = gfs2_setattr_simple(inode, attr);
> + if (!error && attr->ia_valid & ATTR_MODE)
> + error = posix_acl_chmod(inode, inode->i_mode);
> + }
>
> out:
> if (!error)
> @@ -1841,6 +1862,7 @@ const struct inode_operations gfs2_file_iops = {
> .removexattr = gfs2_removexattr,
> .fiemap = gfs2_fiemap,
> .get_acl = gfs2_get_acl,
> + .set_acl = gfs2_set_acl,
> };
>
> const struct inode_operations gfs2_dir_iops = {
> @@ -1862,6 +1884,7 @@ const struct inode_operations gfs2_dir_iops = {
> .removexattr = gfs2_removexattr,
> .fiemap = gfs2_fiemap,
> .get_acl = gfs2_get_acl,
> + .set_acl = gfs2_set_acl,
> .atomic_open = gfs2_atomic_open,
> };
>
> diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
> index 8c6a6f6..0b81f78 100644
> --- a/fs/gfs2/xattr.c
> +++ b/fs/gfs2/xattr.c
> @@ -13,6 +13,7 @@
> #include <linux/buffer_head.h>
> #include <linux/xattr.h>
> #include <linux/gfs2_ondisk.h>
> +#include <linux/posix_acl_xattr.h>
> #include <asm/uaccess.h>
>
> #include "gfs2.h"
> @@ -1500,7 +1501,8 @@ static const struct xattr_handler gfs2_xattr_security_handler = {
> const struct xattr_handler *gfs2_xattr_handlers[] = {
> &gfs2_xattr_user_handler,
> &gfs2_xattr_security_handler,
> - &gfs2_xattr_system_handler,
> + &posix_acl_access_xattr_handler,
> + &posix_acl_default_xattr_handler,
> NULL,
> };
>
--
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