Based on the previous discussions and suggestion by Jeff on providing a way to tell about compiled kernel config options, I wrote a simple patch. It seems useful. But, feel free to ignore this patch if you think it is not..
From: Suresh Jayaraman <[email protected]> Subject: [RFC][PATCH 1/2] cifs: show enabled features in /proc Here's a simple patch to show the compiled in CIFS features. This patch adds a /proc file called "features" when read will show the features enabled in the running kernel as shown below: $cat /proc/fs/cifs/features # CIFS features enabled dfs spnego fsc This provides a definitive way to tell what features are currently enabled. This could be useful as a debugging information as well. Signed-off-by: Suresh Jayaraman <[email protected]> Cc: Jeff Layton <[email protected]> --- fs/cifs/cifs_debug.c | 36 ++++++++++++++++++++++++++++++++++++ 1 files changed, 36 insertions(+), 0 deletions(-) diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c index 4fce6e6..af5dbf7 100644 --- a/fs/cifs/cifs_debug.c +++ b/fs/cifs/cifs_debug.c @@ -402,6 +402,7 @@ static const struct file_operations cifs_multiuser_mount_proc_fops; static const struct file_operations cifs_security_flags_proc_fops; static const struct file_operations cifs_experimental_proc_fops; static const struct file_operations cifs_linux_ext_proc_fops; +static const struct file_operations cifs_feat_proc_fops; void cifs_proc_init(void) @@ -428,6 +429,8 @@ cifs_proc_init(void) &cifs_security_flags_proc_fops); proc_create("LookupCacheEnabled", 0, proc_fs_cifs, &cifs_lookup_cache_proc_fops); + proc_create("features", 0, proc_fs_cifs, + &cifs_feat_proc_fops); } void @@ -448,6 +451,7 @@ cifs_proc_clean(void) remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs); remove_proc_entry("Experimental", proc_fs_cifs); remove_proc_entry("LookupCacheEnabled", proc_fs_cifs); + remove_proc_entry("features", proc_fs_cifs); remove_proc_entry("fs/cifs", NULL); } @@ -791,6 +795,38 @@ static const struct file_operations cifs_security_flags_proc_fops = { .release = single_release, .write = cifs_security_flags_proc_write, }; + +static int cifs_feat_proc_show(struct seq_file *m, void *v) +{ + seq_printf(m, "# CIFS features enabled\n"); +#ifdef CONFIG_CIFS_DFS_UPCALL + seq_printf(m, "dfs"); + seq_putc(m, ' '); +#endif +#ifdef CONFIG_CIFS_UPCALL + seq_printf(m, "spnego"); + seq_putc(m, ' '); +#endif +#ifdef CONFIG_CIFS_FSCACHE + seq_printf(m, "fsc"); + seq_putc(m, ' '); +#endif + seq_putc(m, '\n'); + return 0; +} + +static int cifs_feat_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, cifs_feat_proc_show, NULL); +} + +static const struct file_operations cifs_feat_proc_fops = { + .owner = THIS_MODULE, + .open = cifs_feat_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; #else inline void cifs_proc_init(void) { -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
