[Ocfs2-devel] [PATCH 2/3] Ocfs2: Add a new code 'OCFS2_INFO_FREEINODE' for o2info ioctl.
Tristan Ye
tristan.ye at oracle.com
Mon Jan 31 23:52:25 PST 2011
Mark Fasheh wrote:
> On Sun, Jan 30, 2011 at 02:26:00PM +0800, Tristan Ye wrote:
>> The new code is dedicated to calculate free inodes number of all inode_allocs,
>> then return the info to userpace in terms of an array.
>>
>> Specially, flag 'OCFS2_INFO_FL_NON_COHERENT', manipulated by '--cluster-coherent'
>> from userspace, is now going to be involved. setting the flag on means no cluster
>> coherency considered, usually, userspace tools choose none-coherency strategy by
>> default for the sake of performace.
>>
>> Signed-off-by: Tristan Ye <tristan.ye at oracle.com>
>> ---
>> fs/ocfs2/ioctl.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++
>> fs/ocfs2/ocfs2_ioctl.h | 11 ++++
>> 2 files changed, 133 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
>> index 731cf46..18812be 100644
>> --- a/fs/ocfs2/ioctl.c
>> +++ b/fs/ocfs2/ioctl.c
>> @@ -23,6 +23,9 @@
>> #include "ioctl.h"
>> #include "resize.h"
>> #include "refcounttree.h"
>> +#include "sysfile.h"
>> +#include "dir.h"
>> +#include "buffer_head_io.h"
>>
>> #include <linux/ext2_fs.h>
>>
>> @@ -62,6 +65,13 @@ static inline void __o2info_clear_request_filled(struct ocfs2_info_request *req)
>> #define o2info_clear_request_filled(a) \
>> __o2info_clear_request_filled((struct ocfs2_info_request *)&(a))
>>
>> +static inline int __o2info_coherent(struct ocfs2_info_request *req)
>> +{
>> + return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
>> +}
>> +
>> +#define o2info_coherent(a) __o2info_coherent((struct ocfs2_info_request *)&(a))
>
> Same comment about typechecking as before.
>
>
>> static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
>> {
>> int status;
>> @@ -321,6 +331,114 @@ bail:
>> return status;
>> }
>>
>> +int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
>> + struct inode *inode_alloc, u64 blkno,
>> + struct ocfs2_info_freeinode *fi, u32 slot)
>> +{
>> + int status = 0, unlock = 0;
>> +
>> + struct buffer_head *bh = NULL;
>> + struct ocfs2_dinode *dinode_alloc = NULL;
>> +
>> + if (inode_alloc)
>> + mutex_lock(&inode_alloc->i_mutex);
>> +
>> + if (o2info_coherent(*fi)) {
>> + status = ocfs2_inode_lock(inode_alloc, &bh, 0);
>> + if (status < 0) {
>> + mlog_errno(status);
>> + goto bail;
>> + }
>> + unlock = 1;
>> + } else {
>> + status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
>> + if (status < 0) {
>> + mlog_errno(status);
>> + goto bail;
>> + }
>> + }
>> +
>> + dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
>> +
>> + fi->ifi_stat[slot].lfi_total =
>> + le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
>> + fi->ifi_stat[slot].lfi_free =
>> + le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
>> + le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
>> +
>> +bail:
>> + if (unlock)
>> + ocfs2_inode_unlock(inode_alloc, 0);
>> +
>> + if (inode_alloc)
>> + mutex_unlock(&inode_alloc->i_mutex);
>> +
>> + if (inode_alloc)
>> + iput(inode_alloc);
> ^^^^^^^^^^^^^^^^^^
>
> Is this iput necessary? I don't see a balancing ref in the function.
Good catch, better to iput the inode in the same place where it was got.
>
>> +
>> + brelse(bh);
>> +
>> + mlog_exit(status);
>> + return status;
>> +}
>> +
>> +int ocfs2_info_handle_freeinode(struct inode *inode,
>> + struct ocfs2_info_request __user *req)
>> +{
>> + u32 i;
>> + u64 blkno = -1;
>> + char namebuf[40];
>> + int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
>> + struct ocfs2_info_freeinode oifi;
>> + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
>> + struct inode *inode_alloc = NULL;
>> +
>> + if (o2info_from_user(oifi, req))
>> + goto bail;
>> +
>> + oifi.ifi_slotnum = osb->max_slots;
>> +
>> + for (i = 0; i < oifi.ifi_slotnum; i++) {
>> + if (o2info_coherent(oifi)) {
>> + inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
>> + if (!inode_alloc) {
>> + mlog(ML_ERROR, "unable to get alloc inode in "
>> + "slot %u\n", i);
>> + status = -EIO;
>> + goto bail;
>> + }
>> + } else {
>> + ocfs2_sprintf_system_inode_name(namebuf,
>> + sizeof(namebuf),
>> + type, i);
>> + status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
>> + namebuf,
>> + strlen(namebuf),
>> + &blkno);
>> + if (status < 0) {
>> + status = -ENOENT;
>> + goto bail;
>> + }
>> + }
>> +
>> + status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, &oifi, i);
>
> You need the following here:
>
> iput(inode_alloc);
> inode_alloc = NULL;
>
>> + if (status < 0)
>> + goto bail;
>> + }
>> +
>> + o2info_set_request_filled(oifi);
>> +
>> + if (o2info_to_user(oifi, req))
>> + goto bail;
>> +
>> + status = 0;
>> +bail:
>> + if (status)
>> + o2info_set_request_error(oifi, req);
>> +
>> + return status;
>> +}
>> +
>> int ocfs2_info_handle_unknown(struct inode *inode,
>> struct ocfs2_info_request __user *req)
>> {
>> @@ -392,6 +510,10 @@ int ocfs2_info_handle_request(struct inode *inode,
>> if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
>> status = ocfs2_info_handle_journal_size(inode, req);
>> break;
>> + case OCFS2_INFO_FREEINODE:
>> + if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
>> + status = ocfs2_info_handle_freeinode(inode, req);
>> + break;
>> default:
>> status = ocfs2_info_handle_unknown(inode, req);
>> break;
>> diff --git a/fs/ocfs2/ocfs2_ioctl.h b/fs/ocfs2/ocfs2_ioctl.h
>> index b46f39b..6b4b39a 100644
>> --- a/fs/ocfs2/ocfs2_ioctl.h
>> +++ b/fs/ocfs2/ocfs2_ioctl.h
>> @@ -142,6 +142,16 @@ struct ocfs2_info_journal_size {
>> __u64 ij_journal_size;
>> };
>>
>> +struct ocfs2_info_freeinode {
>> + struct ocfs2_info_request ifi_req;
>> + struct ocfs2_info_local_freeinode {
>> + __u64 lfi_total;
>> + __u64 lfi_free;
>> + } ifi_stat[OCFS2_MAX_SLOTS];
>> + __u32 ifi_slotnum; /* out */
>> + __u32 ifi_pad;
>> +};
>
> Any reason why we don't keep the array (ocfs2_info_local_freeinode) at the
> end of this structure like this:
>
> struct ocfs2_info_freeinode {
> struct ocfs2_info_request ifi_req;
> __u32 ifi_slotnum; /* out */
> __u32 ifi_pad;
> struct ocfs2_info_local_freeinode {
> __u64 lfi_total;
> __u64 lfi_free;
> } ifi_stat[OCFS2_MAX_SLOTS];
> };
Yep, placing the struct in the end didn't hurt any alignment
problem, while I'm
wondering how it will be hurting when It wasn't;-)
> --Mark
>
> --
> Mark Fasheh
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