Commit c6b82263 authored by David Howells's avatar David Howells Committed by Al Viro
Browse files

vfs: Introduce logging functions 



Introduce a set of logging functions through which informational messages,
warnings and error messages incurred by the mount procedure can be logged
and, in a future patch, passed to userspace instead by way of the
filesystem configuration context file descriptor.

There are four functions:

 (1) infof(const char *fmt, ...);

     Logs an informational message.

 (2) warnf(const char *fmt, ...);

     Logs a warning message.

 (3) errorf(const char *fmt, ...);

     Logs an error message.

 (4) invalf(const char *fmt, ...);

     As errof(), but returns -EINVAL so can be used on a return statement.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent f3a09c92

include/linux/fs_context.h

+42 −0
Original line number Diff line number Diff line
@@ -81,4 +81,46 @@ extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_ty 
extern int vfs_get_tree(struct fs_context *fc);

extern void put_fs_context(struct fs_context *fc);



#define logfc(FC, FMT, ...) pr_notice(FMT, ## __VA_ARGS__)



/**

 * infof - Store supplementary informational message

 * @fc: The context in which to log the informational message

 * @fmt: The format string

 *

 * Store the supplementary informational message for the process if the process

 * has enabled the facility.

 */

#define infof(fc, fmt, ...) ({ logfc(fc, fmt, ## __VA_ARGS__); })



/**

 * warnf - Store supplementary warning message

 * @fc: The context in which to log the error message

 * @fmt: The format string

 *

 * Store the supplementary warning message for the process if the process has

 * enabled the facility.

 */

#define warnf(fc, fmt, ...) ({ logfc(fc, fmt, ## __VA_ARGS__); })



/**

 * errorf - Store supplementary error message

 * @fc: The context in which to log the error message

 * @fmt: The format string

 *

 * Store the supplementary error message for the process if the process has

 * enabled the facility.

 */

#define errorf(fc, fmt, ...) ({ logfc(fc, fmt, ## __VA_ARGS__); })



/**

 * invalf - Store supplementary invalid argument error message

 * @fc: The context in which to log the error message

 * @fmt: The format string

 *

 * 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; })



#endif /* _LINUX_FS_CONTEXT_H */

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