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vfs: Introduce logging functions

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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: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2018-11-01 23:07:23 +00:00 committed by Al Viro
parent f3a09c9201
commit c6b82263f9
1 changed files with 42 additions and 0 deletions
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42
include/linux/fs_context.h
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@ -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 */