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Date: Sun, 16 Jun 2013 09:48:48 +0900
From: Namjae Jeon <linkinjeon@...il.com>
To: jaegeuk.kim@...sung.com
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
Namjae Jeon <linkinjeon@...il.com>,
Namjae Jeon <namjae.jeon@...sung.com>,
Gu Zheng <guz.fnst@...fujitsu.com>,
Pankaj Kumar <pankaj.km@...sung.com>
Subject: [PATCH 1/2] f2fs: add remount_fs callback support
From: Namjae Jeon <namjae.jeon@...sung.com>
Add the f2fs_remount function call which will be used
during the filesystem remounting. This function
will help us to change the mount options specific to
f2fs.
Also modify the f2fs background_gc mount option, which
will allow the user to dynamically trun on/off the
garbage collection in f2fs based on the background_gc
value. If background_gc=on, Garbage collection will
be turned off & if background_gc=off, Garbage collection
will be truned on.
By default the garbage collection is on in f2fs.
Change Log:
v2: Incorporated the review comments by Gu Zheng.
Removing the restore part for VFS flags
Updating comments with proper flag conditions
Display GC background option as ON/OFF
Revised conditions to stop GC in case of remount
v1: Initial changes for adding remount_fs callback
support.
Cc: Gu Zheng <guz.fnst@...fujitsu.com>
Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Pankaj Kumar <pankaj.km@...sung.com>
---
Documentation/filesystems/f2fs.txt | 9 +-
fs/f2fs/super.c | 235 +++++++++++++++++++++++-------------
2 files changed, 160 insertions(+), 84 deletions(-)
diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index bd3c56c..b91e2f2 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -98,8 +98,13 @@ Cleaning Overhead
MOUNT OPTIONS
================================================================================
-background_gc_off Turn off cleaning operations, namely garbage collection,
- triggered in background when I/O subsystem is idle.
+background_gc=%s Turn on/off cleaning operations, namely garbage
+ collection, triggered in background when I/O subsystem is
+ idle. If background_gc=on, it will turn on the garbage
+ collection and if background_gc=off, garbage collection
+ will be truned off.
+ Default value for this option is on. So garbage
+ collection is on by default.
disable_roll_forward Disable the roll-forward recovery routine
discard Issue discard/TRIM commands when a segment is cleaned.
no_heap Disable heap-style segment allocation which finds free
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ba56549..5a11484 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -34,7 +34,7 @@
static struct kmem_cache *f2fs_inode_cachep;
enum {
- Opt_gc_background_off,
+ Opt_gc_background,
Opt_disable_roll_forward,
Opt_discard,
Opt_noheap,
@@ -46,7 +46,7 @@ enum {
};
static match_table_t f2fs_tokens = {
- {Opt_gc_background_off, "background_gc_off"},
+ {Opt_gc_background, "background_gc=%s"},
{Opt_disable_roll_forward, "disable_roll_forward"},
{Opt_discard, "discard"},
{Opt_noheap, "no_heap"},
@@ -76,6 +76,91 @@ static void init_once(void *foo)
inode_init_once(&fi->vfs_inode);
}
+static int parse_options(struct super_block *sb, char *options)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ substring_t args[MAX_OPT_ARGS];
+ char *p, *name;
+ int arg = 0;
+
+ if (!options)
+ return 0;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+ /*
+ * Initialize args struct so we know whether arg was
+ * found; some options take optional arguments.
+ */
+ args[0].to = args[0].from = NULL;
+ token = match_token(p, f2fs_tokens, args);
+
+ switch (token) {
+ case Opt_gc_background:
+ name = match_strdup(&args[0]);
+
+ if (!name)
+ return -ENOMEM;
+ if (!strncmp(name, "on", 2))
+ set_opt(sbi, BG_GC);
+ else if (!strncmp(name, "off", 3))
+ clear_opt(sbi, BG_GC);
+ else {
+ kfree(name);
+ return -EINVAL;
+ }
+ kfree(name);
+ break;
+ case Opt_disable_roll_forward:
+ set_opt(sbi, DISABLE_ROLL_FORWARD);
+ break;
+ case Opt_discard:
+ set_opt(sbi, DISCARD);
+ break;
+ case Opt_noheap:
+ set_opt(sbi, NOHEAP);
+ break;
+#ifdef CONFIG_F2FS_FS_XATTR
+ case Opt_nouser_xattr:
+ clear_opt(sbi, XATTR_USER);
+ break;
+#else
+ case Opt_nouser_xattr:
+ f2fs_msg(sb, KERN_INFO,
+ "nouser_xattr options not supported");
+ break;
+#endif
+#ifdef CONFIG_F2FS_FS_POSIX_ACL
+ case Opt_noacl:
+ clear_opt(sbi, POSIX_ACL);
+ break;
+#else
+ case Opt_noacl:
+ f2fs_msg(sb, KERN_INFO, "noacl options not supported");
+ break;
+#endif
+ case Opt_active_logs:
+ if (args->from && match_int(args, &arg))
+ return -EINVAL;
+ if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
+ return -EINVAL;
+ sbi->active_logs = arg;
+ break;
+ case Opt_disable_ext_identify:
+ set_opt(sbi, DISABLE_EXT_IDENTIFY);
+ break;
+ default:
+ f2fs_msg(sb, KERN_ERR,
+ "Unrecognized mount option \"%s\" or missing value",
+ p);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
static struct inode *f2fs_alloc_inode(struct super_block *sb)
{
struct f2fs_inode_info *fi;
@@ -225,10 +310,10 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
{
struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
- if (test_opt(sbi, BG_GC))
- seq_puts(seq, ",background_gc_on");
+ if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
+ seq_printf(seq, ",background_gc=%s", "on");
else
- seq_puts(seq, ",background_gc_off");
+ seq_printf(seq, ",background_gc=%s", "off");
if (test_opt(sbi, DISABLE_ROLL_FORWARD))
seq_puts(seq, ",disable_roll_forward");
if (test_opt(sbi, DISCARD))
@@ -255,6 +340,58 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
return 0;
}
+static int f2fs_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ struct f2fs_mount_info org_mount_opt;
+ int err, active_logs;
+
+ /**
+ * Save the old mount options in case we
+ * need to restore them.
+ */
+ org_mount_opt = sbi->mount_opt;
+ active_logs = sbi->active_logs;
+
+ /* parse mount options */
+ err = parse_options(sb, data);
+ if (err)
+ goto restore_opts;
+
+ /**
+ * Previous and new state of filesystem is RO,
+ * so no point in checking GC conditions.
+ */
+ if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
+ goto skip;
+
+ /**
+ * We stop the GC thread if FS is mounted as RO
+ * or if background_gc = off is passed in mount
+ * option. Also sync the filesystem.
+ */
+ if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
+ if (sbi->gc_thread) {
+ stop_gc_thread(sbi);
+ f2fs_sync_fs(sb, 1);
+ }
+ } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
+ err = start_gc_thread(sbi);
+ if (err)
+ goto restore_opts;
+ }
+skip:
+ /* Update the POSIXACL Flag */
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
+ return 0;
+
+restore_opts:
+ sbi->mount_opt = org_mount_opt;
+ sbi->active_logs = active_logs;
+ return err;
+}
+
static struct super_operations f2fs_sops = {
.alloc_inode = f2fs_alloc_inode,
.drop_inode = f2fs_drop_inode,
@@ -268,6 +405,7 @@ static struct super_operations f2fs_sops = {
.freeze_fs = f2fs_freeze,
.unfreeze_fs = f2fs_unfreeze,
.statfs = f2fs_statfs,
+ .remount_fs = f2fs_remount,
};
static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
@@ -315,79 +453,6 @@ static const struct export_operations f2fs_export_ops = {
.get_parent = f2fs_get_parent,
};
-static int parse_options(struct super_block *sb, char *options)
-{
- struct f2fs_sb_info *sbi = F2FS_SB(sb);
- substring_t args[MAX_OPT_ARGS];
- char *p;
- int arg = 0;
-
- if (!options)
- return 0;
-
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
- /*
- * Initialize args struct so we know whether arg was
- * found; some options take optional arguments.
- */
- args[0].to = args[0].from = NULL;
- token = match_token(p, f2fs_tokens, args);
-
- switch (token) {
- case Opt_gc_background_off:
- clear_opt(sbi, BG_GC);
- break;
- case Opt_disable_roll_forward:
- set_opt(sbi, DISABLE_ROLL_FORWARD);
- break;
- case Opt_discard:
- set_opt(sbi, DISCARD);
- break;
- case Opt_noheap:
- set_opt(sbi, NOHEAP);
- break;
-#ifdef CONFIG_F2FS_FS_XATTR
- case Opt_nouser_xattr:
- clear_opt(sbi, XATTR_USER);
- break;
-#else
- case Opt_nouser_xattr:
- f2fs_msg(sb, KERN_INFO,
- "nouser_xattr options not supported");
- break;
-#endif
-#ifdef CONFIG_F2FS_FS_POSIX_ACL
- case Opt_noacl:
- clear_opt(sbi, POSIX_ACL);
- break;
-#else
- case Opt_noacl:
- f2fs_msg(sb, KERN_INFO, "noacl options not supported");
- break;
-#endif
- case Opt_active_logs:
- if (args->from && match_int(args, &arg))
- return -EINVAL;
- if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
- return -EINVAL;
- sbi->active_logs = arg;
- break;
- case Opt_disable_ext_identify:
- set_opt(sbi, DISABLE_EXT_IDENTIFY);
- break;
- default:
- f2fs_msg(sb, KERN_ERR,
- "Unrecognized mount option \"%s\" or missing value",
- p);
- return -EINVAL;
- }
- }
- return 0;
-}
-
static loff_t max_file_size(unsigned bits)
{
loff_t result = ADDRS_PER_INODE;
@@ -686,10 +751,16 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
"Cannot recover all fsync data errno=%ld", err);
}
- /* After POR, we can run background GC thread */
- err = start_gc_thread(sbi);
- if (err)
- goto fail;
+ /**
+ * If filesystem is not mounted as read-only then
+ * do start the gc_thread.
+ */
+ if (!(sb->s_flags & MS_RDONLY)) {
+ /* After POR, we can run background GC thread.*/
+ err = start_gc_thread(sbi);
+ if (err)
+ goto fail;
+ }
err = f2fs_build_stats(sbi);
if (err)
--
1.7.9.5
--
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