[Ocfs2-devel] [PATCH 2/2] Ocfs2: Add new OCFS2_IOC_INFO ioctl for ocfs2 v6.
Tristan Ye
tristan.ye at oracle.com
Mon Mar 1 21:59:43 PST 2010
The reason why we need this ioctl is to offer the none-privileged
end-user a possibility to get filesys info gathering.
We use OCFS2_IOC_INFO to manipulate the new ioctl, userspace passes a
structure to kernel containing an array of request pointers and request
count, such as,
* From userspace:
struct ocfs2_info_blocksize brq = {
.ir_request = {
.ir_magic = OCFS2_INFO_MAGIC,
.ir_code = OCFS2_INFO_BLOCKSIZE,
...
}
...
}
struct ocfs2_info_clustersize crq = {
...
}
uint64_t reqs[2] = {(unsigned long)&brq,
(unsigned long)&crq};
struct ocfs2_info info = {
.ir_requests = reqs,
.ir_count = 2,
}
ret = ioctl(fd, OCFS2_IOC_INFO, &info);
* In kernel:
Get the request pointers from *info*, then handle each request one bye one.
Idea here is to make the spearated request small enough to guarantee
a better backward&forward compatibility since a small piece of request
would be less likely to be broken if filesys on raw disk get changed.
Currently, following 8 ioctls get implemented per the requirement from
userspace tool o2info, and I believe it will grow over time:-)
OCFS2_INFO_CLUSTERSIZE
OCFS2_INFO_BLOCKSIZE
OCFS2_INFO_SLOTNUM
OCFS2_INFO_LABEL
OCFS2_INFO_UUID
OCFS2_INFO_FS_FEATURES
OCFS2_INFO_FREEFRAG
OCFS2_INFO_FREEINODE
This ioctl is only specific to OCFS2.
Signed-off-by: Tristan Ye <tristan.ye at oracle.com>
---
fs/ocfs2/ioctl.c | 677 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/ocfs2_ioctl.h | 117 +++++++++
2 files changed, 794 insertions(+), 0 deletions(-)
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index 7d9d9c1..58fb935 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -23,8 +23,13 @@
#include "ioctl.h"
#include "resize.h"
#include "refcounttree.h"
+#include "sysfile.h"
+#include "buffer_head_io.h"
+#include "suballoc.h"
+
#include <linux/ext2_fs.h>
+#include <linux/compat.h>
static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
{
@@ -109,6 +114,664 @@ bail:
return status;
}
+int ocfs2_info_handle_blocksize(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_blocksize req_bs;
+
+ if (copy_from_user(&req_bs, user_req,
+ sizeof(struct ocfs2_info_blocksize))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ req_bs.ir_blocksize = inode->i_sb->s_blocksize;
+ req_bs.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_blocksize __user *)user_req,
+ &req_bs,
+ sizeof(struct ocfs2_info_blocksize))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_clustersize(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_clustersize req_cs;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ if (copy_from_user(&req_cs, user_req,
+ sizeof(struct ocfs2_info_clustersize))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ req_cs.ir_clustersize = osb->s_clustersize;
+ req_cs.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_clustersize __user *)user_req,
+ &req_cs,
+ sizeof(struct ocfs2_info_clustersize))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_slotnum(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_slotnum req_sn;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ if (copy_from_user(&req_sn, user_req,
+ sizeof(struct ocfs2_info_slotnum))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ req_sn.ir_slotnum = osb->max_slots;
+ req_sn.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_slotnum __user *)user_req,
+ &req_sn,
+ sizeof(struct ocfs2_info_slotnum))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_label(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_label req_lb;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ if (copy_from_user(&req_lb, user_req,
+ sizeof(struct ocfs2_info_label))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ memcpy(req_lb.ir_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
+ req_lb.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_label __user *)user_req,
+ &req_lb,
+ sizeof(struct ocfs2_info_label))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_uuid(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_uuid req_uuid;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ if (copy_from_user(&req_uuid, user_req,
+ sizeof(struct ocfs2_info_uuid))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ memcpy(req_uuid.ir_uuid_str, osb->uuid_str, OCFS2_INFO_VOL_UUIDSTR_LEN);
+ req_uuid.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_uuid __user *)user_req,
+ &req_uuid,
+ sizeof(struct ocfs2_info_uuid))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_fs_features(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_fs_features req_fs;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ if (copy_from_user(&req_fs, user_req,
+ sizeof(struct ocfs2_info_fs_features))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ req_fs.ir_compat_features = osb->s_feature_compat;
+ req_fs.ir_incompat_features = osb->s_feature_incompat;
+ req_fs.ir_ro_compat_features = osb->s_feature_ro_compat;
+ req_fs.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_fs_features __user *)user_req,
+ &req_fs,
+ sizeof(struct ocfs2_info_fs_features))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
+ unsigned int chunksize)
+{
+ int index;
+
+ index = __ilog2_u32(chunksize);
+ if (index >= OCFS2_INFO_MAX_HIST)
+ index = OCFS2_INFO_MAX_HIST - 1;
+
+ ffg->ir_ffg.ir_fc_hist.ir_fc_chunks[index]++;
+ ffg->ir_ffg.ir_fc_hist.ir_fc_clusters[index] += chunksize;
+
+ if (chunksize > ffg->ir_ffg.ir_max)
+ ffg->ir_ffg.ir_max = chunksize;
+
+ if (chunksize < ffg->ir_ffg.ir_min)
+ ffg->ir_ffg.ir_min = chunksize;
+
+ ffg->ir_ffg.ir_avg += chunksize;
+ ffg->ir_ffg.ir_free_chunks_real++;
+}
+
+int ocfs2_info_scan_chain(struct inode *gb_inode,
+ struct ocfs2_dinode *gb_dinode,
+ struct ocfs2_info_freefrag *ffg,
+ struct ocfs2_chain_rec *rec,
+ unsigned int chunks_in_group)
+{
+ int status = 0, used;
+ u64 blkno;
+
+ struct buffer_head *bh = NULL;
+ struct ocfs2_group_desc *bg = NULL;
+
+ unsigned int max_bits, num_clusters;
+ unsigned int offset = 0, cluster, chunk;
+ unsigned int chunk_free, last_chunksize = 0;
+
+ if (!le32_to_cpu(rec->c_free))
+ goto bail;
+
+ do {
+ if (!bg)
+ blkno = le64_to_cpu(rec->c_blkno);
+ else
+ blkno = le64_to_cpu(bg->bg_next_group);
+
+ if (bh) {
+ brelse(bh);
+ bh = NULL;
+ }
+
+ status = ocfs2_read_group_descriptor(gb_inode, gb_dinode,
+ blkno, &bh);
+ if (status < 0) {
+ mlog(ML_ERROR, "Can't read the group descriptor # "
+ "%llu from device.", (unsigned long long)blkno);
+ status = -EIO;
+ goto bail;
+ }
+
+ bg = (struct ocfs2_group_desc *)bh->b_data;
+
+ if (!le16_to_cpu(bg->bg_free_bits_count))
+ continue;
+
+ max_bits = le16_to_cpu(bg->bg_bits);
+ offset = 0;
+
+ for (chunk = 0; chunk < chunks_in_group; chunk++) {
+
+ /* Last chunk may be not a entire one */
+ if ((offset + ffg->ir_chunksize) > max_bits)
+ num_clusters = max_bits - offset;
+ else
+ num_clusters = ffg->ir_chunksize;
+
+ chunk_free = 0;
+ for (cluster = 0; cluster < num_clusters; cluster++) {
+ used = ocfs2_test_bit(offset,
+ (unsigned long *)bg->bg_bitmap);
+ if (!used) {
+ last_chunksize++;
+ chunk_free++;
+ }
+
+ if (used && (last_chunksize)) {
+ ocfs2_info_update_ffg(ffg,
+ last_chunksize);
+ last_chunksize = 0;
+ }
+
+ offset++;
+ }
+
+ if (chunk_free == ffg->ir_chunksize)
+ ffg->ir_ffg.ir_free_chunks++;
+ }
+
+ /* we need to update the info of last free chunk */
+ if (last_chunksize)
+ ocfs2_info_update_ffg(ffg, last_chunksize);
+
+ } while (le64_to_cpu(bg->bg_next_group));
+
+bail:
+ brelse(bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_scan_bitmap(struct inode *gb_inode,
+ struct ocfs2_dinode *gb_dinode,
+ struct ocfs2_info_freefrag *ffg,
+ struct ocfs2_chain_list *cl)
+{
+ int status = 0, i;
+ unsigned int chunks_in_group;
+ struct ocfs2_chain_rec *rec = NULL;
+
+ chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->ir_chunksize + 1;
+
+ for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
+
+ rec = &(cl->cl_recs[i]);
+ status = ocfs2_info_scan_chain(gb_inode, gb_dinode,
+ ffg, rec, chunks_in_group);
+ if (status)
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_freefrag(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0, unlock = 0;
+
+ struct ocfs2_info_freefrag req_ffg;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct buffer_head *bh = NULL;
+ struct inode *gb_inode = NULL;
+ struct ocfs2_dinode *gb_dinode = NULL;
+ struct ocfs2_chain_list *cl = NULL;
+
+ if (copy_from_user(&req_ffg, user_req,
+ sizeof(struct ocfs2_info_freefrag))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ /*
+ * chunksize from userspace should be power of 2,
+ */
+ if ((req_ffg.ir_chunksize & (req_ffg.ir_chunksize - 1)) ||
+ (!req_ffg.ir_chunksize)) {
+ status = -EINVAL;
+ goto bail;
+ }
+
+ memset(&req_ffg.ir_ffg, 0, sizeof(struct ocfs2_info_freefrag_stats));
+ req_ffg.ir_ffg.ir_min = ~0U;
+
+ gb_inode = ocfs2_get_system_file_inode(osb,
+ GLOBAL_BITMAP_SYSTEM_INODE,
+ OCFS2_INVALID_SLOT);
+ if (!gb_inode) {
+ mlog(ML_ERROR, "failed to get bitmap inode\n");
+ status = -EIO;
+ goto bail;
+ }
+
+ mutex_lock(&gb_inode->i_mutex);
+
+ if (!(req_ffg.ir_request.ir_flags & OCFS2_INFO_FL_NON_COHERENT)) {
+ status = ocfs2_inode_lock(gb_inode, &bh, 0);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail_mutex_unlock;
+ }
+ unlock = 1;
+
+ } else {
+ status = ocfs2_read_inode_block(gb_inode, &bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ gb_dinode = (struct ocfs2_dinode *)bh->b_data;
+
+ req_ffg.ir_ffg.ir_clusters =
+ le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
+ req_ffg.ir_ffg.ir_free_clusters = req_ffg.ir_ffg.ir_clusters -
+ le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
+
+ cl = &(gb_dinode->id2.i_chain);
+
+ /* Chunksize from userspace should be less than clusters in a group */
+ if (req_ffg.ir_chunksize > le16_to_cpu(cl->cl_cpg)) {
+ status = -EINVAL;
+ goto bail;
+ }
+
+ status = ocfs2_info_scan_bitmap(gb_inode, gb_dinode, &req_ffg, cl);
+ if (status)
+ goto bail;
+
+ if (req_ffg.ir_ffg.ir_free_chunks_real)
+ req_ffg.ir_ffg.ir_avg = (req_ffg.ir_ffg.ir_avg /
+ req_ffg.ir_ffg.ir_free_chunks_real);
+
+ req_ffg.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_freefrag __user *)user_req,
+ &req_ffg,
+ sizeof(struct ocfs2_info_freefrag))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ if (unlock)
+ ocfs2_inode_unlock(gb_inode, 0);
+
+bail_mutex_unlock:
+ if (gb_inode)
+ mutex_unlock(&gb_inode->i_mutex);
+
+ iput(gb_inode);
+ brelse(bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_scan_inode_alloc(struct inode *inode_alloc,
+ struct ocfs2_info_freeinode *fi,
+ __u32 slotnum,
+ int flags)
+{
+ int status = 0, unlock = 0;
+
+ struct buffer_head *bh = NULL;
+ struct ocfs2_dinode *dinode_alloc = NULL;
+
+ mutex_lock(&inode_alloc->i_mutex);
+
+ if (!(flags & OCFS2_INFO_FL_NON_COHERENT)) {
+ status = ocfs2_inode_lock(inode_alloc, &bh, 0);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail_mutex_unlock;
+ }
+ unlock = 1;
+
+ } else {
+
+ status = ocfs2_read_inode_block(inode_alloc, &bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
+
+ fi->ir_fi_stat[slotnum].ir_total =
+ le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
+ fi->ir_fi_stat[slotnum].ir_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);
+
+bail_mutex_unlock:
+ mutex_unlock(&inode_alloc->i_mutex);
+
+ iput(inode_alloc);
+ brelse(bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_freeinode(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0, i;
+
+ struct ocfs2_info_freeinode req_fi;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct inode *inode_alloc = NULL;
+
+
+ if (copy_from_user(&req_fi, user_req,
+ sizeof(struct ocfs2_info_freeinode))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ req_fi.ir_slotnum = osb->max_slots;
+
+ for (i = 0; i < req_fi.ir_slotnum; i++) {
+ inode_alloc =
+ ocfs2_get_system_file_inode(osb,
+ INODE_ALLOC_SYSTEM_INODE,
+ i);
+ if (!inode_alloc) {
+ mlog(ML_ERROR, "unable to get alloc inode in slot %u\n",
+ (u32)i);
+ status = -EIO;
+ goto bail;
+ }
+
+ status = ocfs2_info_scan_inode_alloc(inode_alloc, &req_fi, i,
+ req_fi.ir_request.ir_flags);
+ if (status < 0)
+ goto bail;
+ }
+
+ req_fi.ir_request.ir_flags |= OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user((struct ocfs2_info_freeinode __user *)user_req,
+ &req_fi,
+ sizeof(struct ocfs2_info_freeinode))) {
+ status = -EFAULT;
+ }
+
+bail:
+
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_unknown(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_request req;
+
+ if (copy_from_user(&req, user_req, sizeof(struct ocfs2_info_request))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ req.ir_flags &= ~OCFS2_INFO_FL_FILLED;
+
+ if (copy_to_user(user_req, &req,
+ sizeof(struct ocfs2_info_request))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle_request(struct inode *inode,
+ struct ocfs2_info_request __user *user_req)
+{
+ int status = 0;
+ struct ocfs2_info_request req;
+
+ if (copy_from_user(&req, user_req, sizeof(struct ocfs2_info_request))) {
+ status = -EFAULT;
+ goto bail;
+ }
+
+ if (req.ir_magic != OCFS2_INFO_MAGIC) {
+ status = -EINVAL;
+ goto bail;
+ }
+
+ switch (req.ir_code) {
+ case OCFS2_INFO_BLOCKSIZE:
+ if (req.ir_size != sizeof(struct ocfs2_info_blocksize)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_blocksize(inode, user_req);
+ break;
+ case OCFS2_INFO_CLUSTERSIZE:
+ if (req.ir_size != sizeof(struct ocfs2_info_clustersize)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_clustersize(inode, user_req);
+ break;
+ case OCFS2_INFO_SLOTNUM:
+ if (req.ir_size != sizeof(struct ocfs2_info_slotnum)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_slotnum(inode, user_req);
+ break;
+ case OCFS2_INFO_LABEL:
+ if (req.ir_size != sizeof(struct ocfs2_info_label)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_label(inode, user_req);
+ break;
+ case OCFS2_INFO_UUID:
+ if (req.ir_size != sizeof(struct ocfs2_info_uuid)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_uuid(inode, user_req);
+ break;
+ case OCFS2_INFO_FS_FEATURES:
+ if (req.ir_size != sizeof(struct ocfs2_info_fs_features)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_fs_features(inode, user_req);
+ break;
+ case OCFS2_INFO_FREEFRAG:
+ if (req.ir_size != sizeof(struct ocfs2_info_freefrag)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_freefrag(inode, user_req);
+ break;
+ case OCFS2_INFO_FREEINODE:
+ if (req.ir_size != sizeof(struct ocfs2_info_freeinode)) {
+ status = -EINVAL;
+ break;
+ }
+ status = ocfs2_info_handle_freeinode(inode, user_req);
+ break;
+ default:
+ status = ocfs2_info_handle_unknown(inode, user_req);
+ break;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
+ int compat_flag)
+{
+ int i, status = 0;
+ u64 req_addr;
+ struct ocfs2_info_request __user *reqp;
+
+ if ((info->info_count > OCFS2_INFO_MAX_REQUEST) ||
+ (!info->info_requests)) {
+ status = -EINVAL;
+ goto bail;
+ }
+
+ for (i = 0; i < info->info_count; i++) {
+ status = -EFAULT;
+ if (compat_flag) {
+ if (get_user(req_addr,
+ (u64 __user *)compat_ptr(info->info_requests) + i))
+ goto bail;
+ } else {
+ if (get_user(req_addr,
+ (u64 __user *)(info->info_requests) + i))
+ goto bail;
+ }
+
+ reqp = (struct ocfs2_info_request *)req_addr;
+ if (!reqp) {
+ status = -EINVAL;
+ goto bail;
+ }
+
+ status = ocfs2_info_handle_request(inode, reqp);
+ if (status)
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = filp->f_path.dentry->d_inode;
@@ -120,6 +783,7 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
struct reflink_arguments args;
const char *old_path, *new_path;
bool preserve;
+ struct ocfs2_info info;
switch (cmd) {
case OCFS2_IOC_GETFLAGS:
@@ -174,6 +838,12 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
preserve = (args.preserve != 0);
return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
+ case OCFS2_IOC_INFO:
+ if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
+ sizeof(struct ocfs2_info)))
+ return -EFAULT;
+
+ return ocfs2_info_handle(inode, &info, 0);
default:
return -ENOTTY;
}
@@ -185,6 +855,7 @@ long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
bool preserve;
struct reflink_arguments args;
struct inode *inode = file->f_path.dentry->d_inode;
+ struct ocfs2_info info;
switch (cmd) {
case OCFS2_IOC32_GETFLAGS:
@@ -209,6 +880,12 @@ long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
compat_ptr(args.new_path), preserve);
+ case OCFS2_IOC_INFO:
+ if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
+ sizeof(struct ocfs2_info)))
+ return -EFAULT;
+
+ return ocfs2_info_handle(inode, &info, 1);
default:
return -ENOIOCTLCMD;
}
diff --git a/fs/ocfs2/ocfs2_ioctl.h b/fs/ocfs2/ocfs2_ioctl.h
index 2d3420a..9cfe5be 100644
--- a/fs/ocfs2/ocfs2_ioctl.h
+++ b/fs/ocfs2/ocfs2_ioctl.h
@@ -76,4 +76,121 @@ struct reflink_arguments {
};
#define OCFS2_IOC_REFLINK _IOW('o', 4, struct reflink_arguments)
+/* Following definitions dedicated for ocfs2_info_request ioctls. */
+
+#define OCFS2_INFO_VOL_UUID_LEN (16)
+#define OCFS2_INFO_MAX_VOL_LABEL_LEN (64)
+#define OCFS2_INFO_VOL_UUIDSTR_LEN (OCFS2_INFO_VOL_UUID_LEN * 2 + 1)
+#define OCFS2_INFO_MAX_SLOTS (255)
+#define OCFS2_INFO_MAX_HIST (32)
+
+#define OCFS2_INFO_MAX_REQUEST (50)
+
+/* Magic number of all requests */
+#define OCFS2_INFO_MAGIC (0x4F32494E)
+
+/*
+ * Always try to separate info request into small pieces to
+ * guarantee the backward&forward compatibility.
+ */
+
+struct ocfs2_info {
+ __u64 info_requests; /* Array of __u64 pointers to requests */
+ __u32 info_count; /* Number of requests in info_requests */
+};
+
+struct ocfs2_info_request {
+/*00*/ __u32 ir_magic; /* Magic number */
+ __u32 ir_code; /* Info request code */
+ __u32 ir_size; /* Size of request */
+ __u32 ir_flags; /* Request flags */
+/*10*/ /* Request specific fields */
+};
+
+struct ocfs2_info_clustersize {
+ struct ocfs2_info_request ir_request;
+ __u32 ir_clustersize;
+};
+
+struct ocfs2_info_blocksize {
+ struct ocfs2_info_request ir_request;
+ __u32 ir_blocksize;
+};
+
+struct ocfs2_info_slotnum {
+ struct ocfs2_info_request ir_request;
+ __u16 ir_slotnum;
+};
+
+struct ocfs2_info_label {
+ struct ocfs2_info_request ir_request;
+ __u8 ir_label[OCFS2_INFO_MAX_VOL_LABEL_LEN];
+};
+
+struct ocfs2_info_uuid {
+ struct ocfs2_info_request ir_request;
+ __u8 ir_uuid_str[OCFS2_INFO_VOL_UUIDSTR_LEN];
+};
+
+struct ocfs2_info_fs_features {
+ struct ocfs2_info_request ir_request;
+ __u32 ir_compat_features;
+ __u32 ir_incompat_features;
+ __u32 ir_ro_compat_features;
+};
+
+struct ocfs2_info_freefrag {
+ struct ocfs2_info_request ir_request;
+ __u32 ir_chunksize; /* chunksize in clusters(in) */
+ struct ocfs2_info_freefrag_stats { /* (out) */
+ __u32 ir_clusters;
+ __u32 ir_free_clusters;
+ __u32 ir_free_chunks;
+ __u32 ir_free_chunks_real;
+ __u32 ir_min; /* Minimum free chunksize in clusters */
+ __u32 ir_max;
+ __u32 ir_avg;
+ struct ocfs2_info_free_chunk_list {
+ __u32 ir_fc_chunks[OCFS2_INFO_MAX_HIST];
+ __u32 ir_fc_clusters[OCFS2_INFO_MAX_HIST];
+ } ir_fc_hist;
+ } ir_ffg;
+};
+
+struct ocfs2_info_freeinode {
+ struct ocfs2_info_request ir_request;
+ __u32 ir_slotnum; /* out */
+ struct ocfs2_info_local_fi {
+ __u64 ir_total;
+ __u64 ir_free;
+ } ir_fi_stat[OCFS2_INFO_MAX_SLOTS];
+};
+
+/* Codes for ocfs2_info_request */
+enum ocfs2_info_type {
+ OCFS2_INFO_CLUSTERSIZE = 1,
+ OCFS2_INFO_BLOCKSIZE,
+ OCFS2_INFO_SLOTNUM,
+ OCFS2_INFO_LABEL,
+ OCFS2_INFO_UUID,
+ OCFS2_INFO_FS_FEATURES,
+ OCFS2_INFO_FREEFRAG,
+ OCFS2_INFO_FREEINODE,
+ NUM_OCFS2_INFO_TYPE
+};
+
+/* Flags for struct ocfs2_info_request */
+/* Filled by the caller */
+#define OCFS2_INFO_FL_NON_COHERENT (0x00000001) /* Cluster coherency not
+ required. This is a hint.
+ It is up to ocfs2 whether
+ the request can be fulfilled
+ without locking. */
+/* Filled by ocfs2 */
+#define OCFS2_INFO_FL_FILLED (0x80000000) /* Filesystem understood
+ this request and
+ filled in the answer */
+
+#define OCFS2_IOC_INFO _IOR('o', 5, struct ocfs2_info)
+
#endif /* OCFS2_IOCTL_H */
--
1.5.5
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