Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=baf4661a8225d3a39622b795a8db0e6aa845c1ec
Commit: baf4661a8225d3a39622b795a8db0e6aa845c1ec
Parent: 5fb0f7f010ba07e373c30c3e99b0efd868c6c977
Author: Sunil Mushran <[EMAIL PROTECTED]>
AuthorDate: Mon Jun 18 17:00:24 2007 -0700
Committer: Mark Fasheh <[EMAIL PROTECTED]>
CommitDate: Tue Jul 10 17:19:54 2007 -0700
ocfs2: Add "preferred slot" mount option
ocfs2 will attempt to assign the node the slot# provided in the mount
option. Failure to assign the preferred slot is not an error. This small
feature can be useful for automated testing.
Signed-off-by: Sunil Mushran <[EMAIL PROTECTED]>
Signed-off-by: Mark Fasheh <[EMAIL PROTECTED]>
---
fs/ocfs2/ocfs2.h | 1 +
fs/ocfs2/slot_map.c | 12 ++++++++++--
fs/ocfs2/super.c | 23 ++++++++++++++++++++---
3 files changed, 31 insertions(+), 5 deletions(-)
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index a860633..648ef8e 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -219,6 +219,7 @@ struct ocfs2_super
u16 max_slots;
s16 node_num;
s16 slot_num;
+ s16 preferred_slot;
int s_sectsize_bits;
int s_clustersize;
int s_clustersize_bits;
diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index d8b7906..af4882b 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -121,17 +121,25 @@ static s16 __ocfs2_node_num_to_slot(struct
ocfs2_slot_info *si,
return ret;
}
-static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si)
+static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si, s16 preferred)
{
int i;
s16 ret = OCFS2_INVALID_SLOT;
+ if (preferred >= 0 && preferred < si->si_num_slots) {
+ if (OCFS2_INVALID_SLOT == si->si_global_node_nums[preferred]) {
+ ret = preferred;
+ goto out;
+ }
+ }
+
for(i = 0; i < si->si_num_slots; i++) {
if (OCFS2_INVALID_SLOT == si->si_global_node_nums[i]) {
ret = (s16) i;
break;
}
}
+out:
return ret;
}
@@ -248,7 +256,7 @@ int ocfs2_find_slot(struct ocfs2_super *osb)
if (slot == OCFS2_INVALID_SLOT) {
/* if no slot yet, then just take 1st available
* one. */
- slot = __ocfs2_find_empty_slot(si);
+ slot = __ocfs2_find_empty_slot(si, osb->preferred_slot);
if (slot == OCFS2_INVALID_SLOT) {
spin_unlock(&si->si_lock);
mlog(ML_ERROR, "no free slots available!\n");
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 86b559c..f07718a 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -82,7 +82,8 @@ MODULE_AUTHOR("Oracle");
MODULE_LICENSE("GPL");
static int ocfs2_parse_options(struct super_block *sb, char *options,
- unsigned long *mount_opt, int is_remount);
+ unsigned long *mount_opt, s16 *slot,
+ int is_remount);
static void ocfs2_put_super(struct super_block *sb);
static int ocfs2_mount_volume(struct super_block *sb);
static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
@@ -140,6 +141,7 @@ enum {
Opt_data_ordered,
Opt_data_writeback,
Opt_atime_quantum,
+ Opt_slot,
Opt_err,
};
@@ -154,6 +156,7 @@ static match_table_t tokens = {
{Opt_data_ordered, "data=ordered"},
{Opt_data_writeback, "data=writeback"},
{Opt_atime_quantum, "atime_quantum=%u"},
+ {Opt_slot, "preferred_slot=%u"},
{Opt_err, NULL}
};
@@ -355,9 +358,10 @@ static int ocfs2_remount(struct super_block *sb, int
*flags, char *data)
int incompat_features;
int ret = 0;
unsigned long parsed_options;
+ s16 slot;
struct ocfs2_super *osb = OCFS2_SB(sb);
- if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
+ if (!ocfs2_parse_options(sb, data, &parsed_options, &slot, 1)) {
ret = -EINVAL;
goto out;
}
@@ -534,6 +538,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
struct dentry *root;
int status, sector_size;
unsigned long parsed_opt;
+ s16 slot;
struct inode *inode = NULL;
struct ocfs2_super *osb = NULL;
struct buffer_head *bh = NULL;
@@ -541,7 +546,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
mlog_entry("%p, %p, %i", sb, data, silent);
- if (!ocfs2_parse_options(sb, data, &parsed_opt, 0)) {
+ if (!ocfs2_parse_options(sb, data, &parsed_opt, &slot, 0)) {
status = -EINVAL;
goto read_super_error;
}
@@ -571,6 +576,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
brelse(bh);
bh = NULL;
osb->s_mount_opt = parsed_opt;
+ osb->preferred_slot = slot;
sb->s_magic = OCFS2_SUPER_MAGIC;
@@ -713,6 +719,7 @@ static struct file_system_type ocfs2_fs_type = {
static int ocfs2_parse_options(struct super_block *sb,
char *options,
unsigned long *mount_opt,
+ s16 *slot,
int is_remount)
{
int status;
@@ -722,6 +729,7 @@ static int ocfs2_parse_options(struct super_block *sb,
options ? options : "(none)");
*mount_opt = 0;
+ *slot = OCFS2_INVALID_SLOT;
if (!options) {
status = 1;
@@ -782,6 +790,15 @@ static int ocfs2_parse_options(struct super_block *sb,
else
osb->s_atime_quantum =
OCFS2_DEFAULT_ATIME_QUANTUM;
break;
+ case Opt_slot:
+ option = 0;
+ if (match_int(&args[0], &option)) {
+ status = 0;
+ goto bail;
+ }
+ if (option)
+ *slot = (s16)option;
+ break;
default:
mlog(ML_ERROR,
"Unrecognized mount option \"%s\" "
-
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