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ocfs2: clean up localalloc mount option size parsing 

This patch pulls the local alloc sizing code into localalloc.c and provides
a callout to it from ocfs2_fill_super(). Behavior is essentially unchanged
except that I correctly calculate the maximum local alloc size. The old code
in ocfs2_parse_options() calculated the max size as:

ocfs2_local_alloc_size(sb) * 8

which is correct, in bits. Unfortunately though the option passed in is in
megabytes. Ultimately, this bug made no real difference - the shrink code
would catch a too-large size and bring it down to something reasonable.
Still, it's less than efficient as-is.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Mark Fasheh 2010-04-05 18:17:13 -07:00 committed by Joel Becker
parent a57c8fd2ad
commit 73c8a80003
4 changed files with 41 additions and 5 deletions
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28
fs/ocfs2/localalloc.c
View File

@ -75,6 +75,34 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
struct inode *local_alloc_inode);
void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
{
struct super_block *sb = osb->sb;
unsigned int la_default_mb = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
unsigned int la_max_mb;
la_max_mb = ocfs2_clusters_to_megabytes(sb,
ocfs2_local_alloc_size(sb) * 8);
mlog(0, "requested: %dM, max: %uM, default: %uM\n",
requested_mb, la_max_mb, la_default_mb);
if (requested_mb == -1) {
/* No user request - use defaults */
osb->local_alloc_default_bits =
ocfs2_megabytes_to_clusters(sb, la_default_mb);
} else if (requested_mb > la_max_mb) {
/* Request is too big, we give the maximum available */
osb->local_alloc_default_bits =
ocfs2_megabytes_to_clusters(sb, la_max_mb);
} else {
osb->local_alloc_default_bits =
ocfs2_megabytes_to_clusters(sb, requested_mb);
}
osb->local_alloc_bits = osb->local_alloc_default_bits;
}
static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
{
return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||

2
fs/ocfs2/localalloc.h
View File

@ -30,6 +30,8 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb);
void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb);
void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb);
int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
int node_num,
struct ocfs2_dinode **alloc_copy);

6
fs/ocfs2/ocfs2.h
View File

@ -768,6 +768,12 @@ static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
}
static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
unsigned int clusters)
{
return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
}
static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
{
ext2_set_bit(bit, bitmap);

10
fs/ocfs2/super.c
View File

@ -94,7 +94,7 @@ struct mount_options
unsigned long mount_opt;
unsigned int atime_quantum;
signed short slot;
unsigned int localalloc_opt;
int localalloc_opt;
unsigned int resv_level;
char cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
};
@ -1031,8 +1031,8 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
osb->s_atime_quantum = parsed_options.atime_quantum;
osb->preferred_slot = parsed_options.slot;
osb->osb_commit_interval = parsed_options.commit_interval;
osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
osb->local_alloc_bits = osb->local_alloc_default_bits;
ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
osb->osb_resv_level = parsed_options.resv_level;
status = ocfs2_verify_userspace_stack(osb, &parsed_options);
@ -1292,7 +1292,7 @@ static int ocfs2_parse_options(struct super_block *sb,
mopt->mount_opt = 0;
mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
mopt->slot = OCFS2_INVALID_SLOT;
mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
mopt->localalloc_opt = -1;
mopt->cluster_stack[0] = '\0';
mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
@ -1385,7 +1385,7 @@ static int ocfs2_parse_options(struct super_block *sb,
status = 0;
goto bail;
}
if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
if (option >= 0)
mopt->localalloc_opt = option;
break;
case Opt_localflocks: