Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs file system parameter updates from Al Viro:
 "Saner fs_parser.c guts and data structures. The system-wide registry
  of syntax types (string/enum/int32/oct32/.../etc.) is gone and so is
  the horror switch() in fs_parse() that would have to grow another case
  every time something got added to that system-wide registry.

  New syntax types can be added by filesystems easily now, and their
  namespace is that of functions - not of system-wide enum members. IOW,
  they can be shared or kept private and if some turn out to be widely
  useful, we can make them common library helpers, etc., without having
  to do anything whatsoever to fs_parse() itself.

  And we already get that kind of requests - the thing that finally
  pushed me into doing that was "oh, and let's add one for timeouts -
  things like 15s or 2h". If some filesystem really wants that, let them
  do it. Without somebody having to play gatekeeper for the variants
  blessed by direct support in fs_parse(), TYVM.

  Quite a bit of boilerplate is gone. And IMO the data structures make a
  lot more sense now. -200LoC, while we are at it"

* 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (25 commits)
  tmpfs: switch to use of invalfc()
  cgroup1: switch to use of errorfc() et.al.
  procfs: switch to use of invalfc()
  hugetlbfs: switch to use of invalfc()
  cramfs: switch to use of errofc() et.al.
  gfs2: switch to use of errorfc() et.al.
  fuse: switch to use errorfc() et.al.
  ceph: use errorfc() and friends instead of spelling the prefix out
  prefix-handling analogues of errorf() and friends
  turn fs_param_is_... into functions
  fs_parse: handle optional arguments sanely
  fs_parse: fold fs_parameter_desc/fs_parameter_spec
  fs_parser: remove fs_parameter_description name field
  add prefix to fs_context->log
  ceph_parse_param(), ceph_parse_mon_ips(): switch to passing fc_log
  new primitive: __fs_parse()
  switch rbd and libceph to p_log-based primitives
  struct p_log, variants of warnf() et.al. taking that one instead
  teach logfc() to handle prefices, give it saner calling conventions
  get rid of cg_invalf()
  ...

1 files changed, 24 insertions, 8 deletions

diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h
index e5c14e2c53d3..e6c3e4c61dad 100644
--- a/include/linux/fs_context.h
+++ b/include/linux/fs_context.h
@@ -54,7 +54,6 @@ enum fs_value_type {
 	fs_value_is_string,		/* Value is a string */
 	fs_value_is_blob,		/* Value is a binary blob */
 	fs_value_is_filename,		/* Value is a filename* + dirfd */
-	fs_value_is_filename_empty,	/* Value is a filename* + dirfd + AT_EMPTY_PATH */
 	fs_value_is_file,		/* Value is a file* */
 };
 
@@ -74,6 +73,11 @@ struct fs_parameter {
 	int	dirfd;
 };
 
+struct p_log {
+	const char *prefix;
+	struct fc_log *log;
+};
+
 /*
  * Filesystem context for holding the parameters used in the creation or
  * reconfiguration of a superblock.
@@ -93,7 +97,7 @@ struct fs_context {
 	struct user_namespace	*user_ns;	/* The user namespace for this mount */
 	struct net		*net_ns;	/* The network namespace for this mount */
 	const struct cred	*cred;		/* The mounter's credentials */
-	struct fc_log		*log;		/* Logging buffer */
+	struct p_log		log;		/* Logging buffer */
 	const char		*source;	/* The source name (eg. dev path) */
 	void			*security;	/* Linux S&M options */
 	void			*s_fs_info;	/* Proposed s_fs_info */
@@ -182,9 +186,13 @@ struct fc_log {
 	char		*buffer[8];
 };
 
-extern __attribute__((format(printf, 2, 3)))
-void logfc(struct fs_context *fc, const char *fmt, ...);
+extern __attribute__((format(printf, 4, 5)))
+void logfc(struct fc_log *log, const char *prefix, char level, const char *fmt, ...);
 
+#define __logfc(fc, l, fmt, ...) logfc((fc)->log.log, NULL, \
+					l, fmt, ## __VA_ARGS__)
+#define __plog(p, l, fmt, ...) logfc((p)->log, (p)->prefix, \
+					l, fmt, ## __VA_ARGS__)
 /**
  * infof - Store supplementary informational message
  * @fc: The context in which to log the informational message
@@ -193,7 +201,9 @@ void logfc(struct fs_context *fc, const char *fmt, ...);
  * Store the supplementary informational message for the process if the process
  * has enabled the facility.
  */
-#define infof(fc, fmt, ...) ({ logfc(fc, "i "fmt, ## __VA_ARGS__); })
+#define infof(fc, fmt, ...) __logfc(fc, 'i', fmt, ## __VA_ARGS__)
+#define info_plog(p, fmt, ...) __plog(p, 'i', fmt, ## __VA_ARGS__)
+#define infofc(p, fmt, ...) __plog((&(fc)->log), 'i', fmt, ## __VA_ARGS__)
 
 /**
  * warnf - Store supplementary warning message
@@ -203,7 +213,9 @@ void logfc(struct fs_context *fc, const char *fmt, ...);
  * Store the supplementary warning message for the process if the process has
  * enabled the facility.
  */
-#define warnf(fc, fmt, ...) ({ logfc(fc, "w "fmt, ## __VA_ARGS__); })
+#define warnf(fc, fmt, ...) __logfc(fc, 'w', fmt, ## __VA_ARGS__)
+#define warn_plog(p, fmt, ...) __plog(p, 'w', fmt, ## __VA_ARGS__)
+#define warnfc(fc, fmt, ...) __plog((&(fc)->log), 'w', fmt, ## __VA_ARGS__)
 
 /**
  * errorf - Store supplementary error message
@@ -213,7 +225,9 @@ void logfc(struct fs_context *fc, const char *fmt, ...);
  * Store the supplementary error message for the process if the process has
  * enabled the facility.
  */
-#define errorf(fc, fmt, ...) ({ logfc(fc, "e "fmt, ## __VA_ARGS__); })
+#define errorf(fc, fmt, ...) __logfc(fc, 'e', fmt, ## __VA_ARGS__)
+#define error_plog(p, fmt, ...) __plog(p, 'e', fmt, ## __VA_ARGS__)
+#define errorfc(fc, fmt, ...) __plog((&(fc)->log), 'e', fmt, ## __VA_ARGS__)
 
 /**
  * invalf - Store supplementary invalid argument error message
@@ -223,6 +237,8 @@ void logfc(struct fs_context *fc, const char *fmt, ...);
  * Store the supplementary error message for the process if the process has
  * enabled the facility and return -EINVAL.
  */
-#define invalf(fc, fmt, ...) ({	errorf(fc, fmt, ## __VA_ARGS__); -EINVAL; })
+#define invalf(fc, fmt, ...) (errorf(fc, fmt, ## __VA_ARGS__), -EINVAL)
+#define inval_plog(p, fmt, ...) (error_plog(p, fmt, ## __VA_ARGS__), -EINVAL)
+#define invalfc(fc, fmt, ...) (errorfc(fc, fmt, ## __VA_ARGS__), -EINVAL)
 
 #endif /* _LINUX_FS_CONTEXT_H */