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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: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -81,4 +81,46 @@ extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_ty
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extern int vfs_get_tree(struct fs_context *fc);
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extern int vfs_get_tree(struct fs_context *fc);
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extern void put_fs_context(struct fs_context *fc);
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extern void put_fs_context(struct fs_context *fc);
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#define logfc(FC, FMT, ...) pr_notice(FMT, ## __VA_ARGS__)
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/**
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* infof - Store supplementary informational message
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* @fc: The context in which to log the informational message
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* @fmt: The format string
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*
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* Store the supplementary informational message for the process if the process
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* has enabled the facility.
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*/
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#define infof(fc, fmt, ...) ({ logfc(fc, fmt, ## __VA_ARGS__); })
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/**
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* warnf - Store supplementary warning message
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* @fc: The context in which to log the error message
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* @fmt: The format string
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*
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* Store the supplementary warning message for the process if the process has
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* enabled the facility.
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*/
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#define warnf(fc, fmt, ...) ({ logfc(fc, fmt, ## __VA_ARGS__); })
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/**
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* errorf - Store supplementary error message
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* @fc: The context in which to log the error message
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* @fmt: The format string
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*
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* Store the supplementary error message for the process if the process has
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* enabled the facility.
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*/
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#define errorf(fc, fmt, ...) ({ logfc(fc, fmt, ## __VA_ARGS__); })
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/**
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* invalf - Store supplementary invalid argument error message
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* @fc: The context in which to log the error message
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* @fmt: The format string
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*
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* Store the supplementary error message for the process if the process has
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* enabled the facility and return -EINVAL.
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*/
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#define invalf(fc, fmt, ...) ({ errorf(fc, fmt, ## __VA_ARGS__); -EINVAL; })
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#endif /* _LINUX_FS_CONTEXT_H */
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#endif /* _LINUX_FS_CONTEXT_H */
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