Re: [PATCH v2 1/5] staging: lustre: llite: add support set_acl method in inode operations

From: NeilBrown
Date: Mon May 14 2018 - 23:53:20 EST

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In reply to: James Simmons: "[PATCH v2 1/5] staging: lustre: llite: add support set_acl method in inode operations"
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On Mon, May 14 2018, James Simmons wrote:

> From: Dmitry Eremin <dmitry.eremin@xxxxxxxxx>
>
> Linux kernel v3.14 adds set_acl method to inode operations.
> This patch adds support to Lustre for proper acl management.
>
> Signed-off-by: Dmitry Eremin <dmitry.eremin@xxxxxxxxx>
> Signed-off-by: John L. Hammond <john.hammond@xxxxxxxxx>
> Signed-off-by: James Simmons <uja.ornl@xxxxxxxxx>
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-9183
> Reviewed-on: https://review.whamcloud.com/25965
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10541
> Reviewed-on: https://review.whamcloud.com/31588
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10926
> Reviewed-on: https://review.whamcloud.com/32045
> Reviewed-by: Bob Glossman <bob.glossman@xxxxxxxxx>
> Reviewed-by: James Simmons <uja.ornl@xxxxxxxxx>
> Reviewed-by: Andreas Dilger <andreas.dilger@xxxxxxxxx>
> Reviewed-by: Dmitry Eremin <dmitry.eremin@xxxxxxxxx>
> Reviewed-by: Oleg Drokin <oleg.drokin@xxxxxxxxx>
> Signed-off-by: James Simmons <jsimmons@xxxxxxxxxxxxx>
> ---
> Changelog:
>
> v1) Initial patch ported to staging tree
> v2) Fixed up goto handling and avoid BUG() when calling
> forget_cached_acl()with invalid type as pointed out by Dan Carpenter
>
> drivers/staging/lustre/lustre/llite/file.c | 62 ++++++++++++++++++++++
> .../staging/lustre/lustre/llite/llite_internal.h | 4 ++
> drivers/staging/lustre/lustre/llite/namei.c | 10 +++-
> 3 files changed, 74 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
> index 0026fde..64a5698 100644
> --- a/drivers/staging/lustre/lustre/llite/file.c
> +++ b/drivers/staging/lustre/lustre/llite/file.c
> @@ -3030,6 +3030,7 @@ static int ll_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
> return rc;
> }
>
> +#ifdef CONFIG_FS_POSIX_ACL

Using #ifdef in .c files is generally discouraged.
The "standard" approach here is:
- put the acl code in a separate file (acl.c)
- optionally include it via the Make file
lustre-$(CONFIG_FS_POSIX_ACL) += acl.o

- in the header where ll_get_acl and ll_set_acl are declared have
#ifdef CONFIG_FS_POSIX_ACL
declare the functions
#else
#define ll_get_acl NULL
#define ll_set_acl NULL
#endif

Now as this is staging and that is (presumably) an upstream patch
lightly improved it is probably fine to include the patch as-is,
but in that case we will probably want to fix it up later.

Thanks,
NeilBrown

> struct posix_acl *ll_get_acl(struct inode *inode, int type)
> {
> struct ll_inode_info *lli = ll_i2info(inode);
> @@ -3043,6 +3044,64 @@ struct posix_acl *ll_get_acl(struct inode *inode, int type)
> return acl;
> }
>
> +int ll_set_acl(struct inode *inode, struct posix_acl *acl, int type)
> +{
> + struct ll_sb_info *sbi = ll_i2sbi(inode);
> + struct ptlrpc_request *req = NULL;
> + const char *name = NULL;
> + size_t value_size = 0;
> + char *value = NULL;
> + int rc;
> +
> + switch (type) {
> + case ACL_TYPE_ACCESS:
> + name = XATTR_NAME_POSIX_ACL_ACCESS;
> + if (acl)
> + rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
> + break;
> +
> + case ACL_TYPE_DEFAULT:
> + name = XATTR_NAME_POSIX_ACL_DEFAULT;
> + if (!S_ISDIR(inode->i_mode))
> + rc = acl ? -EACCES : 0;
> + break;
> +
> + default:
> + rc = -EINVAL;
> + break;
> + }
> + if (rc)
> + return rc;
> +
> + if (acl) {
> + value_size = posix_acl_xattr_size(acl->a_count);
> + value = kmalloc(value_size, GFP_NOFS);
> + if (!value) {
> + rc = -ENOMEM;
> + goto out;
> + }
> +
> + rc = posix_acl_to_xattr(&init_user_ns, acl, value, value_size);
> + if (rc < 0)
> + goto out_value;
> + }
> +
> + rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode),
> + value ? OBD_MD_FLXATTR : OBD_MD_FLXATTRRM,
> + name, value, value_size, 0, 0, 0, &req);
> +
> + ptlrpc_req_finished(req);
> +out_value:
> + kfree(value);
> +out:
> + if (rc)
> + forget_cached_acl(inode, type);
> + else
> + set_cached_acl(inode, type, acl);
> + return rc;
> +}
> +#endif /* CONFIG_FS_POSIX_ACL */
> +
> int ll_inode_permission(struct inode *inode, int mask)
> {
> struct ll_sb_info *sbi;
> @@ -3164,7 +3223,10 @@ int ll_inode_permission(struct inode *inode, int mask)
> .permission = ll_inode_permission,
> .listxattr = ll_listxattr,
> .fiemap = ll_fiemap,
> +#ifdef CONFIG_FS_POSIX_ACL
> .get_acl = ll_get_acl,
> + .set_acl = ll_set_acl,
> +#endif
> };
>
> /* dynamic ioctl number support routines */
> diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h
> index 6504850..2280327 100644
> --- a/drivers/staging/lustre/lustre/llite/llite_internal.h
> +++ b/drivers/staging/lustre/lustre/llite/llite_internal.h
> @@ -754,7 +754,11 @@ enum ldlm_mode ll_take_md_lock(struct inode *inode, __u64 bits,
> int ll_md_real_close(struct inode *inode, fmode_t fmode);
> int ll_getattr(const struct path *path, struct kstat *stat,
> u32 request_mask, unsigned int flags);
> +#ifdef CONFIG_FS_POSIX_ACL
> struct posix_acl *ll_get_acl(struct inode *inode, int type);
> +int ll_set_acl(struct inode *inode, struct posix_acl *acl, int type);
> +#endif /* CONFIG_FS_POSIX_ACL */
> +
> int ll_migrate(struct inode *parent, struct file *file, int mdtidx,
> const char *name, int namelen);
> int ll_get_fid_by_name(struct inode *parent, const char *name,
> diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c
> index 9ac7f09..b41f189 100644
> --- a/drivers/staging/lustre/lustre/llite/namei.c
> +++ b/drivers/staging/lustre/lustre/llite/namei.c
> @@ -1195,7 +1195,10 @@ static int ll_rename(struct inode *src, struct dentry *src_dchild,
> .getattr = ll_getattr,
> .permission = ll_inode_permission,
> .listxattr = ll_listxattr,
> - .get_acl = ll_get_acl,
> +#ifdef CONFIG_FS_POSIX_ACL
> + .get_acl = ll_get_acl,
> + .set_acl = ll_set_acl,
> +#endif
> };
>
> const struct inode_operations ll_special_inode_operations = {
> @@ -1203,5 +1206,8 @@ static int ll_rename(struct inode *src, struct dentry *src_dchild,
> .getattr = ll_getattr,
> .permission = ll_inode_permission,
> .listxattr = ll_listxattr,
> - .get_acl = ll_get_acl,
> +#ifdef CONFIG_FS_POSIX_ACL
> + .get_acl = ll_get_acl,
> + .set_acl = ll_set_acl,
> +#endif
> };
> --
> 1.8.3.1

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Next message: Gustavo A. R. Silva: "Re: [PATCH 01/11] media: tm6000: fix potential Spectre variant 1"
Previous message: Paul E. McKenney: "Re: [PATCH RFC 7/8] rcu: trace CleanupMore condition only if needed"
In reply to: James Simmons: "[PATCH v2 1/5] staging: lustre: llite: add support set_acl method in inode operations"
Next in thread: Greg Kroah-Hartman: "Re: [PATCH v2 1/5] staging: lustre: llite: add support set_acl method in inode operations"
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