* [PATCH v13 1/4] fs: split off setxattr_copy and do_setxattr function from setxattr
2022-03-23 15:44 [PATCH v13 0/4] io_uring: add xattr support Stefan Roesch
@ 2022-03-23 15:44 ` Stefan Roesch
2022-03-23 15:44 ` [PATCH v13 2/4] fs: split off do_getxattr from getxattr Stefan Roesch
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Stefan Roesch @ 2022-03-23 15:44 UTC (permalink / raw)
To: io-uring, linux-fsdevel, kernel-team; +Cc: viro, christian.brauner, shr
This splits of the setup part of the function
setxattr in its own dedicated function called
setxattr_copy. In addition it also exposes a
new function called do_setxattr for making the
setxattr call.
This makes it possible to call these two functions
from io_uring in the processing of an xattr request.
Signed-off-by: Stefan Roesch <[email protected]>
Acked-by: Christian Brauner <[email protected]>
---
fs/internal.h | 24 +++++++++++++++
fs/xattr.c | 82 ++++++++++++++++++++++++++++++++++++---------------
2 files changed, 82 insertions(+), 24 deletions(-)
diff --git a/fs/internal.h b/fs/internal.h
index 56c0477f4215..96bbab6b58ba 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -196,3 +196,27 @@ long splice_file_to_pipe(struct file *in,
struct pipe_inode_info *opipe,
loff_t *offset,
size_t len, unsigned int flags);
+
+/*
+ * fs/xattr.c:
+ */
+struct xattr_name {
+ char name[XATTR_NAME_MAX + 1];
+};
+
+struct xattr_ctx {
+ /* Value of attribute */
+ union {
+ const void __user *cvalue;
+ void __user *value;
+ };
+ void *kvalue;
+ size_t size;
+ /* Attribute name */
+ struct xattr_name *kname;
+ unsigned int flags;
+};
+
+int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
+int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+ struct xattr_ctx *ctx);
diff --git a/fs/xattr.c b/fs/xattr.c
index 5c8c5175b385..717b3904c2e5 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -25,6 +25,8 @@
#include <linux/uaccess.h>
+#include "internal.h"
+
static const char *
strcmp_prefix(const char *a, const char *a_prefix)
{
@@ -539,43 +541,75 @@ EXPORT_SYMBOL_GPL(vfs_removexattr);
/*
* Extended attribute SET operations
*/
-static long
-setxattr(struct user_namespace *mnt_userns, struct dentry *d,
- const char __user *name, const void __user *value, size_t size,
- int flags)
+
+int setxattr_copy(const char __user *name, struct xattr_ctx *ctx)
{
int error;
- void *kvalue = NULL;
- char kname[XATTR_NAME_MAX + 1];
- if (flags & ~(XATTR_CREATE|XATTR_REPLACE))
+ if (ctx->flags & ~(XATTR_CREATE|XATTR_REPLACE))
return -EINVAL;
- error = strncpy_from_user(kname, name, sizeof(kname));
- if (error == 0 || error == sizeof(kname))
- error = -ERANGE;
+ error = strncpy_from_user(ctx->kname->name, name,
+ sizeof(ctx->kname->name));
+ if (error == 0 || error == sizeof(ctx->kname->name))
+ return -ERANGE;
if (error < 0)
return error;
- if (size) {
- if (size > XATTR_SIZE_MAX)
+ error = 0;
+ if (ctx->size) {
+ if (ctx->size > XATTR_SIZE_MAX)
return -E2BIG;
- kvalue = kvmalloc(size, GFP_KERNEL);
- if (!kvalue)
- return -ENOMEM;
- if (copy_from_user(kvalue, value, size)) {
- error = -EFAULT;
- goto out;
+
+ ctx->kvalue = vmemdup_user(ctx->cvalue, ctx->size);
+ if (IS_ERR(ctx->kvalue)) {
+ error = PTR_ERR(ctx->kvalue);
+ ctx->kvalue = NULL;
}
- if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_from_user(mnt_userns, kvalue, size);
}
- error = vfs_setxattr(mnt_userns, d, kname, kvalue, size, flags);
-out:
- kvfree(kvalue);
+ return error;
+}
+
+static void setxattr_convert(struct user_namespace *mnt_userns,
+ struct xattr_ctx *ctx)
+{
+ if (ctx->size &&
+ ((strcmp(ctx->kname->name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
+ (strcmp(ctx->kname->name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)))
+ posix_acl_fix_xattr_from_user(mnt_userns, ctx->kvalue, ctx->size);
+}
+
+int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+ struct xattr_ctx *ctx)
+{
+ setxattr_convert(mnt_userns, ctx);
+ return vfs_setxattr(mnt_userns, dentry, ctx->kname->name,
+ ctx->kvalue, ctx->size, ctx->flags);
+}
+
+static long
+setxattr(struct user_namespace *mnt_userns, struct dentry *d,
+ const char __user *name, const void __user *value, size_t size,
+ int flags)
+{
+ struct xattr_name kname;
+ struct xattr_ctx ctx = {
+ .cvalue = value,
+ .kvalue = NULL,
+ .size = size,
+ .kname = &kname,
+ .flags = flags,
+ };
+ int error;
+
+ error = setxattr_copy(name, &ctx);
+ if (error)
+ return error;
+
+ error = do_setxattr(mnt_userns, d, &ctx);
+ kvfree(ctx.kvalue);
return error;
}
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v13 2/4] fs: split off do_getxattr from getxattr
2022-03-23 15:44 [PATCH v13 0/4] io_uring: add xattr support Stefan Roesch
2022-03-23 15:44 ` [PATCH v13 1/4] fs: split off setxattr_copy and do_setxattr function from setxattr Stefan Roesch
@ 2022-03-23 15:44 ` Stefan Roesch
2022-03-23 15:44 ` [PATCH v13 3/4] io_uring: add fsetxattr and setxattr support Stefan Roesch
2022-03-23 15:44 ` [PATCH v13 4/4] io_uring: add fgetxattr and getxattr support Stefan Roesch
3 siblings, 0 replies; 6+ messages in thread
From: Stefan Roesch @ 2022-03-23 15:44 UTC (permalink / raw)
To: io-uring, linux-fsdevel, kernel-team; +Cc: viro, christian.brauner, shr
This splits off do_getxattr function from the getxattr
function. This will allow io_uring to call it from its
io worker.
Signed-off-by: Stefan Roesch <[email protected]>
Acked-by: Christian Brauner <[email protected]>
---
fs/internal.h | 5 +++++
fs/xattr.c | 59 +++++++++++++++++++++++++++++++++------------------
2 files changed, 43 insertions(+), 21 deletions(-)
diff --git a/fs/internal.h b/fs/internal.h
index 96bbab6b58ba..4a28ae13aaa4 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -217,6 +217,11 @@ struct xattr_ctx {
unsigned int flags;
};
+
+ssize_t do_getxattr(struct user_namespace *mnt_userns,
+ struct dentry *d,
+ struct xattr_ctx *ctx);
+
int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
struct xattr_ctx *ctx);
diff --git a/fs/xattr.c b/fs/xattr.c
index 717b3904c2e5..0b9f296a7071 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -675,43 +675,60 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
/*
* Extended attribute GET operations
*/
-static ssize_t
-getxattr(struct user_namespace *mnt_userns, struct dentry *d,
- const char __user *name, void __user *value, size_t size)
+ssize_t
+do_getxattr(struct user_namespace *mnt_userns, struct dentry *d,
+ struct xattr_ctx *ctx)
{
ssize_t error;
- void *kvalue = NULL;
- char kname[XATTR_NAME_MAX + 1];
+ char *kname = ctx->kname->name;
- error = strncpy_from_user(kname, name, sizeof(kname));
- if (error == 0 || error == sizeof(kname))
- error = -ERANGE;
- if (error < 0)
- return error;
-
- if (size) {
- if (size > XATTR_SIZE_MAX)
- size = XATTR_SIZE_MAX;
- kvalue = kvzalloc(size, GFP_KERNEL);
- if (!kvalue)
+ if (ctx->size) {
+ if (ctx->size > XATTR_SIZE_MAX)
+ ctx->size = XATTR_SIZE_MAX;
+ ctx->kvalue = kvzalloc(ctx->size, GFP_KERNEL);
+ if (!ctx->kvalue)
return -ENOMEM;
}
- error = vfs_getxattr(mnt_userns, d, kname, kvalue, size);
+ error = vfs_getxattr(mnt_userns, d, kname, ctx->kvalue, ctx->size);
if (error > 0) {
if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
(strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_to_user(mnt_userns, kvalue, error);
- if (size && copy_to_user(value, kvalue, error))
+ posix_acl_fix_xattr_to_user(mnt_userns, ctx->kvalue, error);
+ if (ctx->size && copy_to_user(ctx->value, ctx->kvalue, error))
error = -EFAULT;
- } else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {
+ } else if (error == -ERANGE && ctx->size >= XATTR_SIZE_MAX) {
/* The file system tried to returned a value bigger
than XATTR_SIZE_MAX bytes. Not possible. */
error = -E2BIG;
}
- kvfree(kvalue);
+ return error;
+}
+
+static ssize_t
+getxattr(struct user_namespace *mnt_userns, struct dentry *d,
+ const char __user *name, void __user *value, size_t size)
+{
+ ssize_t error;
+ struct xattr_name kname;
+ struct xattr_ctx ctx = {
+ .value = value,
+ .kvalue = NULL,
+ .size = size,
+ .kname = &kname,
+ .flags = 0,
+ };
+
+ error = strncpy_from_user(kname.name, name, sizeof(kname.name));
+ if (error == 0 || error == sizeof(kname.name))
+ error = -ERANGE;
+ if (error < 0)
+ return error;
+ error = do_getxattr(mnt_userns, d, &ctx);
+
+ kvfree(ctx.kvalue);
return error;
}
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v13 3/4] io_uring: add fsetxattr and setxattr support
2022-03-23 15:44 [PATCH v13 0/4] io_uring: add xattr support Stefan Roesch
2022-03-23 15:44 ` [PATCH v13 1/4] fs: split off setxattr_copy and do_setxattr function from setxattr Stefan Roesch
2022-03-23 15:44 ` [PATCH v13 2/4] fs: split off do_getxattr from getxattr Stefan Roesch
@ 2022-03-23 15:44 ` Stefan Roesch
2022-03-23 15:44 ` [PATCH v13 4/4] io_uring: add fgetxattr and getxattr support Stefan Roesch
3 siblings, 0 replies; 6+ messages in thread
From: Stefan Roesch @ 2022-03-23 15:44 UTC (permalink / raw)
To: io-uring, linux-fsdevel, kernel-team; +Cc: viro, christian.brauner, shr
This adds support to io_uring for the fsetxattr and setxattr API.
Signed-off-by: Stefan Roesch <[email protected]>
Acked-by: Christian Brauner <[email protected]>
---
fs/io_uring.c | 165 ++++++++++++++++++++++++++++++++++
include/uapi/linux/io_uring.h | 6 +-
2 files changed, 170 insertions(+), 1 deletion(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 496a2af7d12c..d71073be91c2 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -82,6 +82,7 @@
#include <linux/tracehook.h>
#include <linux/audit.h>
#include <linux/security.h>
+#include <linux/xattr.h>
#define CREATE_TRACE_POINTS
#include <trace/events/io_uring.h>
@@ -755,6 +756,12 @@ struct io_async_rw {
struct wait_page_queue wpq;
};
+struct io_xattr {
+ struct file *file;
+ struct xattr_ctx ctx;
+ struct filename *filename;
+};
+
enum {
REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT,
REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT,
@@ -901,6 +908,7 @@ struct io_kiocb {
struct io_symlink symlink;
struct io_hardlink hardlink;
struct io_msg msg;
+ struct io_xattr xattr;
};
u8 opcode;
@@ -1154,6 +1162,10 @@ static const struct io_op_def io_op_defs[] = {
[IORING_OP_MSG_RING] = {
.needs_file = 1,
},
+ [IORING_OP_FSETXATTR] = {
+ .needs_file = 1
+ },
+ [IORING_OP_SETXATTR] = {},
};
/* requests with any of those set should undergo io_disarm_next() */
@@ -4094,6 +4106,144 @@ static int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
return 0;
}
+static inline void __io_xattr_finish(struct io_kiocb *req)
+{
+ struct io_xattr *ix = &req->xattr;
+
+ if (ix->filename)
+ putname(ix->filename);
+
+ kfree(ix->ctx.kname);
+ kvfree(ix->ctx.kvalue);
+}
+
+static void io_xattr_finish(struct io_kiocb *req, int ret)
+{
+ req->flags &= ~REQ_F_NEED_CLEANUP;
+
+ __io_xattr_finish(req);
+ if (ret < 0)
+ req_set_fail(req);
+
+ io_req_complete(req, ret);
+}
+
+static int __io_setxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = &req->xattr;
+ const char __user *name;
+ int ret;
+
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (unlikely(sqe->ioprio))
+ return -EINVAL;
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ ix->filename = NULL;
+ name = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ ix->ctx.kvalue = NULL;
+ ix->ctx.size = READ_ONCE(sqe->len);
+ ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
+
+ ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
+ if (!ix->ctx.kname)
+ return -ENOMEM;
+
+ ret = setxattr_copy(name, &ix->ctx);
+ if (ret) {
+ kfree(ix->ctx.kname);
+ return ret;
+ }
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ return 0;
+}
+
+static int io_setxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = &req->xattr;
+ const char __user *path;
+ int ret;
+
+ ret = __io_setxattr_prep(req, sqe);
+ if (ret)
+ return ret;
+
+ path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
+
+ ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
+ if (IS_ERR(ix->filename)) {
+ ret = PTR_ERR(ix->filename);
+ ix->filename = NULL;
+ }
+
+ return ret;
+}
+
+static int io_fsetxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ return __io_setxattr_prep(req, sqe);
+}
+
+static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags,
+ struct path *path)
+{
+ struct io_xattr *ix = &req->xattr;
+ int ret;
+
+ ret = mnt_want_write(path->mnt);
+ if (!ret) {
+ ret = do_setxattr(mnt_user_ns(path->mnt), path->dentry, &ix->ctx);
+ mnt_drop_write(path->mnt);
+ }
+
+ return ret;
+}
+
+static int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ return -EAGAIN;
+
+ ret = __io_setxattr(req, issue_flags, &req->file->f_path);
+ io_xattr_finish(req, ret);
+
+ return 0;
+}
+
+static int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = &req->xattr;
+ unsigned int lookup_flags = LOOKUP_FOLLOW;
+ struct path path;
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ return -EAGAIN;
+
+retry:
+ ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
+ if (!ret) {
+ ret = __io_setxattr(req, issue_flags, &path);
+ path_put(&path);
+ if (retry_estale(ret, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
+ }
+
+ io_xattr_finish(req, ret);
+ return 0;
+}
+
static int io_unlinkat_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@@ -6985,6 +7135,10 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return io_linkat_prep(req, sqe);
case IORING_OP_MSG_RING:
return io_msg_ring_prep(req, sqe);
+ case IORING_OP_FSETXATTR:
+ return io_fsetxattr_prep(req, sqe);
+ case IORING_OP_SETXATTR:
+ return io_setxattr_prep(req, sqe);
}
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
@@ -7130,6 +7284,10 @@ static void io_clean_op(struct io_kiocb *req)
if (req->statx.filename)
putname(req->statx.filename);
break;
+ case IORING_OP_SETXATTR:
+ case IORING_OP_FSETXATTR:
+ __io_xattr_finish(req);
+ break;
}
}
if ((req->flags & REQ_F_POLLED) && req->apoll) {
@@ -7275,6 +7433,12 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
case IORING_OP_MSG_RING:
ret = io_msg_ring(req, issue_flags);
break;
+ case IORING_OP_FSETXATTR:
+ ret = io_fsetxattr(req, issue_flags);
+ break;
+ case IORING_OP_SETXATTR:
+ ret = io_setxattr(req, issue_flags);
+ break;
default:
ret = -EINVAL;
break;
@@ -11927,6 +12091,7 @@ static int __init io_uring_init(void)
BUILD_BUG_SQE_ELEM(42, __u16, personality);
BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in);
BUILD_BUG_SQE_ELEM(44, __u32, file_index);
+ BUILD_BUG_SQE_ELEM(48, __u64, addr3);
BUILD_BUG_ON(sizeof(struct io_uring_files_update) !=
sizeof(struct io_uring_rsrc_update));
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index d2be4eb22008..68d003d49f14 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -45,6 +45,7 @@ struct io_uring_sqe {
__u32 rename_flags;
__u32 unlink_flags;
__u32 hardlink_flags;
+ __u32 xattr_flags;
};
__u64 user_data; /* data to be passed back at completion time */
/* pack this to avoid bogus arm OABI complaints */
@@ -60,7 +61,8 @@ struct io_uring_sqe {
__s32 splice_fd_in;
__u32 file_index;
};
- __u64 __pad2[2];
+ __u64 addr3;
+ __u64 __pad2[1];
};
enum {
@@ -145,6 +147,8 @@ enum {
IORING_OP_SYMLINKAT,
IORING_OP_LINKAT,
IORING_OP_MSG_RING,
+ IORING_OP_FSETXATTR,
+ IORING_OP_SETXATTR,
/* this goes last, obviously */
IORING_OP_LAST,
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v13 4/4] io_uring: add fgetxattr and getxattr support
2022-03-23 15:44 [PATCH v13 0/4] io_uring: add xattr support Stefan Roesch
` (2 preceding siblings ...)
2022-03-23 15:44 ` [PATCH v13 3/4] io_uring: add fsetxattr and setxattr support Stefan Roesch
@ 2022-03-23 15:44 ` Stefan Roesch
2022-03-24 8:50 ` Christian Brauner
3 siblings, 1 reply; 6+ messages in thread
From: Stefan Roesch @ 2022-03-23 15:44 UTC (permalink / raw)
To: io-uring, linux-fsdevel, kernel-team; +Cc: viro, christian.brauner, shr
This adds support to io_uring for the fgetxattr and getxattr API.
Signed-off-by: Stefan Roesch <[email protected]>
---
fs/io_uring.c | 129 ++++++++++++++++++++++++++++++++++
include/uapi/linux/io_uring.h | 2 +
2 files changed, 131 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index d71073be91c2..6ae0eef96f3e 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1166,6 +1166,10 @@ static const struct io_op_def io_op_defs[] = {
.needs_file = 1
},
[IORING_OP_SETXATTR] = {},
+ [IORING_OP_FGETXATTR] = {
+ .needs_file = 1
+ },
+ [IORING_OP_GETXATTR] = {},
};
/* requests with any of those set should undergo io_disarm_next() */
@@ -4128,6 +4132,119 @@ static void io_xattr_finish(struct io_kiocb *req, int ret)
io_req_complete(req, ret);
}
+static int __io_getxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = &req->xattr;
+ const char __user *name;
+ int ret;
+
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (unlikely(sqe->ioprio))
+ return -EINVAL;
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ ix->filename = NULL;
+ ix->ctx.kvalue = NULL;
+ name = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ ix->ctx.size = READ_ONCE(sqe->len);
+ ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
+
+ if (ix->ctx.flags)
+ return -EINVAL;
+
+ ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
+ if (!ix->ctx.kname)
+ return -ENOMEM;
+
+ ret = strncpy_from_user(ix->ctx.kname->name, name,
+ sizeof(ix->ctx.kname->name));
+ if (!ret || ret == sizeof(ix->ctx.kname->name))
+ ret = -ERANGE;
+ if (ret < 0) {
+ kfree(ix->ctx.kname);
+ return ret;
+ }
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ return 0;
+}
+
+static int io_fgetxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ return __io_getxattr_prep(req, sqe);
+}
+
+static int io_getxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = &req->xattr;
+ const char __user *path;
+ int ret;
+
+ ret = __io_getxattr_prep(req, sqe);
+ if (ret)
+ return ret;
+
+ path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
+
+ ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
+ if (IS_ERR(ix->filename)) {
+ ret = PTR_ERR(ix->filename);
+ ix->filename = NULL;
+ }
+
+ return ret;
+}
+
+static int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = &req->xattr;
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ return -EAGAIN;
+
+ ret = do_getxattr(mnt_user_ns(req->file->f_path.mnt),
+ req->file->f_path.dentry,
+ &ix->ctx);
+
+ io_xattr_finish(req, ret);
+ return 0;
+}
+
+static int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = &req->xattr;
+ unsigned int lookup_flags = LOOKUP_FOLLOW;
+ struct path path;
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ return -EAGAIN;
+
+retry:
+ ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
+ if (!ret) {
+ ret = do_getxattr(mnt_user_ns(path.mnt),
+ path.dentry,
+ &ix->ctx);
+
+ path_put(&path);
+ if (retry_estale(ret, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
+ }
+
+ io_xattr_finish(req, ret);
+ return 0;
+}
+
static int __io_setxattr_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@@ -7139,6 +7256,10 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return io_fsetxattr_prep(req, sqe);
case IORING_OP_SETXATTR:
return io_setxattr_prep(req, sqe);
+ case IORING_OP_FGETXATTR:
+ return io_fgetxattr_prep(req, sqe);
+ case IORING_OP_GETXATTR:
+ return io_getxattr_prep(req, sqe);
}
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
@@ -7286,6 +7407,8 @@ static void io_clean_op(struct io_kiocb *req)
break;
case IORING_OP_SETXATTR:
case IORING_OP_FSETXATTR:
+ case IORING_OP_GETXATTR:
+ case IORING_OP_FGETXATTR:
__io_xattr_finish(req);
break;
}
@@ -7439,6 +7562,12 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
case IORING_OP_SETXATTR:
ret = io_setxattr(req, issue_flags);
break;
+ case IORING_OP_FGETXATTR:
+ ret = io_fgetxattr(req, issue_flags);
+ break;
+ case IORING_OP_GETXATTR:
+ ret = io_getxattr(req, issue_flags);
+ break;
default:
ret = -EINVAL;
break;
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 68d003d49f14..77a8cec5a6bb 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -149,6 +149,8 @@ enum {
IORING_OP_MSG_RING,
IORING_OP_FSETXATTR,
IORING_OP_SETXATTR,
+ IORING_OP_FGETXATTR,
+ IORING_OP_GETXATTR,
/* this goes last, obviously */
IORING_OP_LAST,
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread