From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
George Dunlap <george.dunlap@citrix.com>,
Ian Jackson <iwj@xenproject.org>, Jan Beulich <jbeulich@suse.com>,
Julien Grall <julien@xen.org>,
Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>
Subject: [PATCH v2 14/17] xen/hypfs: add support for id-based dynamic directories
Date: Tue, 1 Dec 2020 09:21:25 +0100 [thread overview]
Message-ID: <20201201082128.15239-15-jgross@suse.com> (raw)
In-Reply-To: <20201201082128.15239-1-jgross@suse.com>
Add some helpers to hypfs.c to support dynamic directories with a
numerical id as name.
The dynamic directory is based on a template specified by the user
allowing to use specific access functions and having a predefined
set of entries in the directory.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
V2:
- use macro for length of entry name (Jan Beulich)
- const attributes (Jan Beulich)
- use template name as format string (Jan Beulich)
- add hypfs_dynid_entry_size() helper (Jan Beulich)
- expect dyndir data having been allocated by enter() callback
---
xen/common/hypfs.c | 75 +++++++++++++++++++++++++++++++++++++++++
xen/include/xen/hypfs.h | 17 ++++++++++
2 files changed, 92 insertions(+)
diff --git a/xen/common/hypfs.c b/xen/common/hypfs.c
index 39448c5409..1819b26925 100644
--- a/xen/common/hypfs.c
+++ b/xen/common/hypfs.c
@@ -355,6 +355,81 @@ unsigned int hypfs_getsize(const struct hypfs_entry *entry)
return entry->size;
}
+int hypfs_read_dyndir_id_entry(const struct hypfs_entry_dir *template,
+ unsigned int id, bool is_last,
+ XEN_GUEST_HANDLE_PARAM(void) *uaddr)
+{
+ struct xen_hypfs_dirlistentry direntry;
+ char name[HYPFS_DYNDIR_ID_NAMELEN];
+ unsigned int e_namelen, e_len;
+
+ e_namelen = snprintf(name, sizeof(name), template->e.name, id);
+ e_len = DIRENTRY_SIZE(e_namelen);
+ direntry.e.pad = 0;
+ direntry.e.type = template->e.type;
+ direntry.e.encoding = template->e.encoding;
+ direntry.e.content_len = template->e.funcs->getsize(&template->e);
+ direntry.e.max_write_len = template->e.max_size;
+ direntry.off_next = is_last ? 0 : e_len;
+ if ( copy_to_guest(*uaddr, &direntry, 1) )
+ return -EFAULT;
+ if ( copy_to_guest_offset(*uaddr, DIRENTRY_NAME_OFF, name,
+ e_namelen + 1) )
+ return -EFAULT;
+
+ guest_handle_add_offset(*uaddr, e_len);
+
+ return 0;
+}
+
+static struct hypfs_entry *hypfs_dyndir_findentry(
+ const struct hypfs_entry_dir *dir, const char *name, unsigned int name_len)
+{
+ const struct hypfs_dyndir_id *data;
+
+ data = hypfs_get_dyndata();
+
+ /* Use template with original findentry function. */
+ return data->template->e.funcs->findentry(data->template, name, name_len);
+}
+
+static int hypfs_read_dyndir(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr)
+{
+ const struct hypfs_dyndir_id *data;
+
+ data = hypfs_get_dyndata();
+
+ /* Use template with original read function. */
+ return data->template->e.funcs->read(&data->template->e, uaddr);
+}
+
+struct hypfs_entry *hypfs_gen_dyndir_entry_id(
+ const struct hypfs_entry_dir *template, unsigned int id)
+{
+ struct hypfs_dyndir_id *data;
+
+ data = hypfs_get_dyndata();
+
+ data->template = template;
+ data->id = id;
+ snprintf(data->name, sizeof(data->name), template->e.name, id);
+ data->dir = *template;
+ data->dir.e.name = data->name;
+ data->dir.e.funcs = &data->funcs;
+ data->funcs = *template->e.funcs;
+ data->funcs.findentry = hypfs_dyndir_findentry;
+ data->funcs.read = hypfs_read_dyndir;
+
+ return &data->dir.e;
+}
+
+unsigned int hypfs_dynid_entry_size(const struct hypfs_entry *template,
+ unsigned int id)
+{
+ return DIRENTRY_SIZE(snprintf(NULL, 0, template->name, id));
+}
+
int hypfs_read_dir(const struct hypfs_entry *entry,
XEN_GUEST_HANDLE_PARAM(void) uaddr)
{
diff --git a/xen/include/xen/hypfs.h b/xen/include/xen/hypfs.h
index be8d6c508a..1782c50b30 100644
--- a/xen/include/xen/hypfs.h
+++ b/xen/include/xen/hypfs.h
@@ -76,6 +76,16 @@ struct hypfs_entry_dir {
struct list_head dirlist;
};
+struct hypfs_dyndir_id {
+ struct hypfs_entry_dir dir; /* Modified copy of template. */
+ struct hypfs_funcs funcs; /* Dynamic functions. */
+ const struct hypfs_entry_dir *template; /* Template used. */
+#define HYPFS_DYNDIR_ID_NAMELEN 12
+ char name[HYPFS_DYNDIR_ID_NAMELEN]; /* Name of hypfs entry. */
+
+ unsigned int id; /* Numerical id. */
+};
+
#define HYPFS_VARDIR_INIT(var, nam, fn) \
struct hypfs_entry_dir __read_mostly var = { \
.e.type = XEN_HYPFS_TYPE_DIR, \
@@ -181,6 +191,13 @@ struct hypfs_entry *hypfs_dir_findentry(const struct hypfs_entry_dir *dir,
void *hypfs_alloc_dyndata(unsigned long size);
void *hypfs_get_dyndata(void);
void hypfs_free_dyndata(void);
+int hypfs_read_dyndir_id_entry(const struct hypfs_entry_dir *template,
+ unsigned int id, bool is_last,
+ XEN_GUEST_HANDLE_PARAM(void) *uaddr);
+struct hypfs_entry *hypfs_gen_dyndir_entry_id(
+ const struct hypfs_entry_dir *template, unsigned int id);
+unsigned int hypfs_dynid_entry_size(const struct hypfs_entry *template,
+ unsigned int id);
#endif
#endif /* __XEN_HYPFS_H__ */
--
2.26.2
next prev parent reply other threads:[~2020-12-01 8:22 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 8:21 [PATCH v2 00/17] xen: support per-cpupool scheduling granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 01/17] xen/cpupool: add cpu to sched_res_mask when removing it from cpupool Juergen Gross
2020-12-01 8:21 ` [PATCH v2 02/17] xen/cpupool: add missing bits for per-cpupool scheduling granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 03/17] xen/cpupool: sort included headers in cpupool.c Juergen Gross
2020-12-01 8:21 ` [PATCH v2 04/17] xen/cpupool: switch cpupool id to unsigned Juergen Gross
2020-12-01 8:55 ` Jan Beulich
2020-12-01 9:01 ` Jürgen Groß
2020-12-01 9:07 ` Jan Beulich
2020-12-07 9:59 ` Jan Beulich
2020-12-07 14:48 ` Jürgen Groß
2020-12-07 15:00 ` Jan Beulich
2020-12-04 15:52 ` Dario Faggioli
2020-12-07 9:58 ` Jan Beulich
2020-12-07 15:21 ` Jan Beulich
2020-12-01 8:21 ` [PATCH v2 05/17] xen/cpupool: switch cpupool list to normal list interface Juergen Gross
2020-12-01 9:12 ` Jan Beulich
2020-12-01 9:18 ` Jürgen Groß
2020-12-04 16:13 ` Dario Faggioli
2020-12-04 16:16 ` Jürgen Groß
2020-12-04 16:25 ` Dario Faggioli
2020-12-04 16:56 ` Dario Faggioli
2020-12-01 8:21 ` [PATCH v2 06/17] xen/cpupool: use ERR_PTR() for returning error cause from cpupool_create() Juergen Gross
2020-12-02 8:58 ` Jan Beulich
2020-12-02 9:56 ` Jürgen Groß
2020-12-02 10:46 ` Jan Beulich
2020-12-02 10:58 ` Jürgen Groß
2020-12-04 16:29 ` Dario Faggioli
2020-12-01 8:21 ` [PATCH v2 07/17] xen/cpupool: support moving domain between cpupools with different granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 08/17] docs: fix hypfs path documentation Juergen Gross
2020-12-01 8:21 ` [PATCH v2 09/17] xen/hypfs: move per-node function pointers into a dedicated struct Juergen Gross
2020-12-02 15:36 ` Jan Beulich
2020-12-02 15:41 ` Jürgen Groß
2020-12-03 8:47 ` Jürgen Groß
2020-12-03 9:12 ` Jan Beulich
2020-12-03 9:51 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 10/17] xen/hypfs: pass real failure reason up from hypfs_get_entry() Juergen Gross
2020-12-01 8:21 ` [PATCH v2 11/17] xen/hypfs: add getsize() and findentry() callbacks to hypfs_funcs Juergen Gross
2020-12-02 15:42 ` Jan Beulich
2020-12-02 15:51 ` Jürgen Groß
2020-12-03 8:12 ` Jan Beulich
2020-12-03 9:39 ` Jürgen Groß
2020-12-04 8:58 ` Jan Beulich
2020-12-04 11:14 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 12/17] xen/hypfs: add new enter() and exit() per node callbacks Juergen Gross
2020-12-03 14:59 ` Jan Beulich
2020-12-03 15:14 ` Jürgen Groß
2020-12-03 15:29 ` Jan Beulich
2020-12-04 8:33 ` Jürgen Groß
2020-12-04 8:30 ` Jan Beulich
2020-12-04 8:35 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 13/17] xen/hypfs: support dynamic hypfs nodes Juergen Gross
2020-12-03 15:08 ` Jan Beulich
2020-12-03 15:18 ` Jürgen Groß
2020-12-01 8:21 ` Juergen Gross [this message]
2020-12-03 15:44 ` [PATCH v2 14/17] xen/hypfs: add support for id-based dynamic directories Jan Beulich
2020-12-04 8:52 ` Jürgen Groß
2020-12-04 9:16 ` Jan Beulich
2020-12-04 13:08 ` Jürgen Groß
2020-12-07 7:54 ` Jan Beulich
2020-12-01 8:21 ` [PATCH v2 15/17] xen/cpupool: add cpupool directories Juergen Gross
2020-12-01 9:00 ` Jan Beulich
2020-12-01 9:03 ` Jürgen Groß
2020-12-02 15:46 ` Jürgen Groß
2020-12-03 14:46 ` Jan Beulich
2020-12-03 15:11 ` Jürgen Groß
2020-12-04 9:10 ` Jan Beulich
2020-12-04 11:08 ` Jürgen Groß
2020-12-04 11:54 ` Jan Beulich
2020-12-01 8:21 ` [PATCH v2 16/17] xen/cpupool: add scheduling granularity entry to cpupool entries Juergen Gross
2020-12-01 8:21 ` [PATCH v2 17/17] xen/cpupool: make per-cpupool sched-gran hypfs node writable Juergen Gross
2020-12-04 23:53 ` [PATCH v2 00/17] xen: support per-cpupool scheduling granularity Andrew Cooper
2020-12-05 7:41 ` Jürgen Groß
2020-12-07 9:00 ` Jan Beulich
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