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author | Miklos Szeredi <mszeredi@suse.cz> | 2008-02-08 04:21:35 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-08 09:22:39 -0800 |
commit | b3b304a23a8f7ae4c40c7b512ee45afae0010a70 (patch) | |
tree | 04ada9ae35e912b6c3d56c0aefdc297216f2e0a5 /fs | |
parent | f84e3f521e1449300e0fdc314b7b43b418a66dc3 (diff) | |
download | kernel_samsung_smdk4412-b3b304a23a8f7ae4c40c7b512ee45afae0010a70.zip kernel_samsung_smdk4412-b3b304a23a8f7ae4c40c7b512ee45afae0010a70.tar.gz kernel_samsung_smdk4412-b3b304a23a8f7ae4c40c7b512ee45afae0010a70.tar.bz2 |
mount options: add generic_show_options()
Add a new s_options field to struct super_block. Filesystems can save
mount options passed to them in mount or remount. It is automatically
freed when the superblock is destroyed.
A new helper function, generic_show_options() is introduced, which uses
this field to display the mount options in /proc/mounts.
Another helper function, save_mount_options() may be used by
filesystems to save the options in the super block.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/namespace.c | 49 | ||||
-rw-r--r-- | fs/super.c | 1 |
2 files changed, 45 insertions, 5 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index e9c10cd..db51ddc 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -320,6 +320,50 @@ void mnt_unpin(struct vfsmount *mnt) EXPORT_SYMBOL(mnt_unpin); +static inline void mangle(struct seq_file *m, const char *s) +{ + seq_escape(m, s, " \t\n\\"); +} + +/* + * Simple .show_options callback for filesystems which don't want to + * implement more complex mount option showing. + * + * See also save_mount_options(). + */ +int generic_show_options(struct seq_file *m, struct vfsmount *mnt) +{ + const char *options = mnt->mnt_sb->s_options; + + if (options != NULL && options[0]) { + seq_putc(m, ','); + mangle(m, options); + } + + return 0; +} +EXPORT_SYMBOL(generic_show_options); + +/* + * If filesystem uses generic_show_options(), this function should be + * called from the fill_super() callback. + * + * The .remount_fs callback usually needs to be handled in a special + * way, to make sure, that previous options are not overwritten if the + * remount fails. + * + * Also note, that if the filesystem's .remount_fs function doesn't + * reset all options to their default value, but changes only newly + * given options, then the displayed options will not reflect reality + * any more. + */ +void save_mount_options(struct super_block *sb, char *options) +{ + kfree(sb->s_options); + sb->s_options = kstrdup(options, GFP_KERNEL); +} +EXPORT_SYMBOL(save_mount_options); + /* iterator */ static void *m_start(struct seq_file *m, loff_t *pos) { @@ -341,11 +385,6 @@ static void m_stop(struct seq_file *m, void *v) up_read(&namespace_sem); } -static inline void mangle(struct seq_file *m, const char *s) -{ - seq_escape(m, s, " \t\n\\"); -} - static int show_vfsmnt(struct seq_file *m, void *v) { struct vfsmount *mnt = list_entry(v, struct vfsmount, mnt_list); @@ -105,6 +105,7 @@ static inline void destroy_super(struct super_block *s) { security_sb_free(s); kfree(s->s_subtype); + kfree(s->s_options); kfree(s); } |