kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
linux-hardened/fs/ocfs2/ioctl.c
Tristan Ye d24a10b9f8 Ocfs2: Add a new code 'OCFS2_INFO_FREEFRAG' for o2info ioctl. 
This new code is a bit more complicated than former ones, the goal is to
show user all statistics required to take a deep insight into filesystem
on how the disk is being fragmentaed.

The goal is achieved by scaning global bitmap from (cluster)group to group
to figure out following factors in the filesystem:

        - How many free chunks in a fixed size as user requested.
        - How many real free chunks in all size.
        - Min/Max/Avg size(in) clusters of free chunks.
        - How do free chunks distribute(in size) in terms of a histogram,
          just like following:
          ---------------------------------------------------------
          Extent Size Range :  Free extents  Free Clusters  Percent
             32K...   64K-  :             1             1    0.00%
              1M...    2M-  :             9           288    0.03%
              8M...   16M-  :             2           831    0.09%
             32M...   64M-  :             1          2047    0.23%
            128M...  256M-  :             1          8191    0.92%
            256M...  512M-  :             2         21706    2.43%
            512M... 1024M-  :            27        858623   96.29%
          ---------------------------------------------------------

Userspace ioctl() call eventually gets the above info returned by passing
a 'struct ocfs2_info_freefrag' with the chunk_size being specified first.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
2011-05-25 12:18:07 +08:00

1002 lines
22 KiB
C
Raw Blame History

/*
* linux/fs/ocfs2/ioctl.c
*
* Copyright (C) 2006 Herbert Poetzl
* adapted from Remy Card's ext2/ioctl.c
*/
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/compat.h>
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "ocfs2_fs.h"
#include "ioctl.h"
#include "resize.h"
#include "refcounttree.h"
#include "sysfile.h"
#include "dir.h"
#include "buffer_head_io.h"
#include "suballoc.h"
#include <linux/ext2_fs.h>
#define o2info_from_user(a, b) \
copy_from_user(&(a), (b), sizeof(a))
#define o2info_to_user(a, b) \
copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
/*
* This call is void because we are already reporting an error that may
* be -EFAULT. The error will be returned from the ioctl(2) call. It's
* just a best-effort to tell userspace that this request caused the error.
*/
static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
struct ocfs2_info_request __user *req)
{
kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
(void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
}
static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
{
req->ir_flags |= OCFS2_INFO_FL_FILLED;
}
static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
{
req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
}
static inline int o2info_coherent(struct ocfs2_info_request *req)
{
return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
}
static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
{
int status;
status = ocfs2_inode_lock(inode, NULL, 0);
if (status < 0) {
mlog_errno(status);
return status;
}
ocfs2_get_inode_flags(OCFS2_I(inode));
*flags = OCFS2_I(inode)->ip_attr;
ocfs2_inode_unlock(inode, 0);
return status;
}
static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
unsigned mask)
{
struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
handle_t *handle = NULL;
struct buffer_head *bh = NULL;
unsigned oldflags;
int status;
mutex_lock(&inode->i_mutex);
status = ocfs2_inode_lock(inode, &bh, 1);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = -EACCES;
if (!inode_owner_or_capable(inode))
goto bail_unlock;
if (!S_ISDIR(inode->i_mode))
flags &= ~OCFS2_DIRSYNC_FL;
handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto bail_unlock;
}
oldflags = ocfs2_inode->ip_attr;
flags = flags & mask;
flags |= oldflags & ~mask;
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
* the relevant capability.
*/
status = -EPERM;
if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
if (!capable(CAP_LINUX_IMMUTABLE))
goto bail_unlock;
}
ocfs2_inode->ip_attr = flags;
ocfs2_set_inode_flags(inode);
status = ocfs2_mark_inode_dirty(handle, inode, bh);
if (status < 0)
mlog_errno(status);
ocfs2_commit_trans(osb, handle);
bail_unlock:
ocfs2_inode_unlock(inode, 1);
bail:
mutex_unlock(&inode->i_mutex);
brelse(bh);
return status;
}
int ocfs2_info_handle_blocksize(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_blocksize oib;
if (o2info_from_user(oib, req))
goto bail;
oib.ib_blocksize = inode->i_sb->s_blocksize;
o2info_set_request_filled(&oib.ib_req);
if (o2info_to_user(oib, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oib.ib_req, req);
return status;
}
int ocfs2_info_handle_clustersize(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_clustersize oic;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oic, req))
goto bail;
oic.ic_clustersize = osb->s_clustersize;
o2info_set_request_filled(&oic.ic_req);
if (o2info_to_user(oic, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oic.ic_req, req);
return status;
}
int ocfs2_info_handle_maxslots(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_maxslots oim;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oim, req))
goto bail;
oim.im_max_slots = osb->max_slots;
o2info_set_request_filled(&oim.im_req);
if (o2info_to_user(oim, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oim.im_req, req);
return status;
}
int ocfs2_info_handle_label(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_label oil;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oil, req))
goto bail;
memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
o2info_set_request_filled(&oil.il_req);
if (o2info_to_user(oil, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oil.il_req, req);
return status;
}
int ocfs2_info_handle_uuid(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_uuid oiu;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oiu, req))
goto bail;
memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
o2info_set_request_filled(&oiu.iu_req);
if (o2info_to_user(oiu, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oiu.iu_req, req);
return status;
}
int ocfs2_info_handle_fs_features(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_fs_features oif;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oif, req))
goto bail;
oif.if_compat_features = osb->s_feature_compat;
oif.if_incompat_features = osb->s_feature_incompat;
oif.if_ro_compat_features = osb->s_feature_ro_compat;
o2info_set_request_filled(&oif.if_req);
if (o2info_to_user(oif, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oif.if_req, req);
return status;
}
int ocfs2_info_handle_journal_size(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_journal_size oij;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oij, req))
goto bail;
oij.ij_journal_size = osb->journal->j_inode->i_size;
o2info_set_request_filled(&oij.ij_req);
if (o2info_to_user(oij, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oij.ij_req, req);
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->ifi_req)) {
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);
brelse(bh);
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 = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct inode *inode_alloc = NULL;
oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
if (!oifi) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
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->ifi_req)) {
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);
if (status < 0)
goto bail;
iput(inode_alloc);
inode_alloc = NULL;
}
o2info_set_request_filled(&oifi->ifi_req);
if (o2info_to_user(*oifi, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oifi->ifi_req, req);
kfree(oifi);
return status;
}
static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
unsigned int chunksize)
{
int index;
index = __ilog2_u32(chunksize);
if (index >= OCFS2_INFO_MAX_HIST)
index = OCFS2_INFO_MAX_HIST - 1;
hist->fc_chunks[index]++;
hist->fc_clusters[index] += chunksize;
}
static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
unsigned int chunksize)
{
if (chunksize > stats->ffs_max)
stats->ffs_max = chunksize;
if (chunksize < stats->ffs_min)
stats->ffs_min = chunksize;
stats->ffs_avg += chunksize;
stats->ffs_free_chunks_real++;
}
void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
unsigned int chunksize)
{
o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
}
int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
struct inode *gb_inode,
struct ocfs2_dinode *gb_dinode,
struct ocfs2_chain_rec *rec,
struct ocfs2_info_freefrag *ffg,
u32 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;
}
if (o2info_coherent(&ffg->iff_req))
status = ocfs2_read_group_descriptor(gb_inode,
gb_dinode,
blkno, &bh);
else
status = ocfs2_read_blocks_sync(osb, blkno, 1, &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 an entire one.
*/
if ((offset + ffg->iff_chunksize) > max_bits)
num_clusters = max_bits - offset;
else
num_clusters = ffg->iff_chunksize;
chunk_free = 0;
for (cluster = 0; cluster < num_clusters; cluster++) {
used = ocfs2_test_bit(offset,
(unsigned long *)bg->bg_bitmap);
/*
* - chunk_free counts free clusters in #N chunk.
* - last_chunksize records the size(in) clusters
* for the last real free chunk being counted.
*/
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->iff_chunksize)
ffg->iff_ffs.ffs_free_chunks++;
}
/*
* need to update the info for last free chunk.
*/
if (last_chunksize)
ocfs2_info_update_ffg(ffg, last_chunksize);
} while (le64_to_cpu(bg->bg_next_group));
bail:
brelse(bh);
return status;
}
int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
struct inode *gb_inode, u64 blkno,
struct ocfs2_info_freefrag *ffg)
{
u32 chunks_in_group;
int status = 0, unlock = 0, i;
struct buffer_head *bh = NULL;
struct ocfs2_chain_list *cl = NULL;
struct ocfs2_chain_rec *rec = NULL;
struct ocfs2_dinode *gb_dinode = NULL;
if (gb_inode)
mutex_lock(&gb_inode->i_mutex);
if (o2info_coherent(&ffg->iff_req)) {
status = ocfs2_inode_lock(gb_inode, &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;
}
}
gb_dinode = (struct ocfs2_dinode *)bh->b_data;
cl = &(gb_dinode->id2.i_chain);
/*
* Chunksize(in) clusters from userspace should be
* less than clusters in a group.
*/
if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
status = -EINVAL;
goto bail;
}
memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
ffg->iff_ffs.ffs_min = ~0U;
ffg->iff_ffs.ffs_clusters =
le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
rec = &(cl->cl_recs[i]);
status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
gb_dinode,
rec, ffg,
chunks_in_group);
if (status)
goto bail;
}
if (ffg->iff_ffs.ffs_free_chunks_real)
ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
ffg->iff_ffs.ffs_free_chunks_real);
bail:
if (unlock)
ocfs2_inode_unlock(gb_inode, 0);
if (gb_inode)
mutex_unlock(&gb_inode->i_mutex);
if (gb_inode)
iput(gb_inode);
brelse(bh);
return status;
}
int ocfs2_info_handle_freefrag(struct inode *inode,
struct ocfs2_info_request __user *req)
{
u64 blkno = -1;
char namebuf[40];
int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
struct ocfs2_info_freefrag *oiff;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct inode *gb_inode = NULL;
oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
if (!oiff) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
if (o2info_from_user(*oiff, req))
goto bail;
/*
* chunksize from userspace should be power of 2.
*/
if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
(!oiff->iff_chunksize)) {
status = -EINVAL;
goto bail;
}
if (o2info_coherent(&oiff->iff_req)) {
gb_inode = ocfs2_get_system_file_inode(osb, type,
OCFS2_INVALID_SLOT);
if (!gb_inode) {
mlog(ML_ERROR, "unable to get global_bitmap inode\n");
status = -EIO;
goto bail;
}
} else {
ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
OCFS2_INVALID_SLOT);
status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
namebuf,
strlen(namebuf),
&blkno);
if (status < 0) {
status = -ENOENT;
goto bail;
}
}
status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
if (status < 0)
goto bail;
o2info_set_request_filled(&oiff->iff_req);
if (o2info_to_user(*oiff, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oiff->iff_req, req);
kfree(oiff);
return status;
}
int ocfs2_info_handle_unknown(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_request oir;
if (o2info_from_user(oir, req))
goto bail;
o2info_clear_request_filled(&oir);
if (o2info_to_user(oir, req))
goto bail;
status = 0;
bail:
if (status)
o2info_set_request_error(&oir, req);
return status;
}
/*
* Validate and distinguish OCFS2_IOC_INFO requests.
*
* - validate the magic number.
* - distinguish different requests.
* - validate size of different requests.
*/
int ocfs2_info_handle_request(struct inode *inode,
struct ocfs2_info_request __user *req)
{
int status = -EFAULT;
struct ocfs2_info_request oir;
if (o2info_from_user(oir, req))
goto bail;
status = -EINVAL;
if (oir.ir_magic != OCFS2_INFO_MAGIC)
goto bail;
switch (oir.ir_code) {
case OCFS2_INFO_BLOCKSIZE:
if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
status = ocfs2_info_handle_blocksize(inode, req);
break;
case OCFS2_INFO_CLUSTERSIZE:
if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
status = ocfs2_info_handle_clustersize(inode, req);
break;
case OCFS2_INFO_MAXSLOTS:
if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
status = ocfs2_info_handle_maxslots(inode, req);
break;
case OCFS2_INFO_LABEL:
if (oir.ir_size == sizeof(struct ocfs2_info_label))
status = ocfs2_info_handle_label(inode, req);
break;
case OCFS2_INFO_UUID:
if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
status = ocfs2_info_handle_uuid(inode, req);
break;
case OCFS2_INFO_FS_FEATURES:
if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
status = ocfs2_info_handle_fs_features(inode, req);
break;
case OCFS2_INFO_JOURNAL_SIZE:
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;
case OCFS2_INFO_FREEFRAG:
if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
status = ocfs2_info_handle_freefrag(inode, req);
break;
default:
status = ocfs2_info_handle_unknown(inode, req);
break;
}
bail:
return status;
}
int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
u64 *req_addr, int compat_flag)
{
int status = -EFAULT;
u64 __user *bp = NULL;
if (compat_flag) {
#ifdef CONFIG_COMPAT
/*
* pointer bp stores the base address of a pointers array,
* which collects all addresses of separate request.
*/
bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
#else
BUG();
#endif
} else
bp = (u64 __user *)(unsigned long)(info->oi_requests);
if (o2info_from_user(*req_addr, bp + idx))
goto bail;
status = 0;
bail:
return status;
}
/*
* OCFS2_IOC_INFO handles an array of requests passed from userspace.
*
* ocfs2_info_handle() recevies a large info aggregation, grab and
* validate the request count from header, then break it into small
* pieces, later specific handlers can handle them one by one.
*
* Idea here is to make each separate request small enough to ensure
* a better backward&forward compatibility, since a small piece of
* request will be less likely to be broken if disk layout get changed.
*/
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->oi_count > OCFS2_INFO_MAX_REQUEST) ||
(!info->oi_requests)) {
status = -EINVAL;
goto bail;
}
for (i = 0; i < info->oi_count; i++) {
status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
if (status)
break;
reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
if (!reqp) {
status = -EINVAL;
goto bail;
}
status = ocfs2_info_handle_request(inode, reqp);
if (status)
break;
}
bail:
return status;
}
long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = filp->f_path.dentry->d_inode;
unsigned int flags;
int new_clusters;
int status;
struct ocfs2_space_resv sr;
struct ocfs2_new_group_input input;
struct reflink_arguments args;
const char *old_path, *new_path;
bool preserve;
struct ocfs2_info info;
switch (cmd) {
case OCFS2_IOC_GETFLAGS:
status = ocfs2_get_inode_attr(inode, &flags);
if (status < 0)
return status;
flags &= OCFS2_FL_VISIBLE;
return put_user(flags, (int __user *) arg);
case OCFS2_IOC_SETFLAGS:
if (get_user(flags, (int __user *) arg))
return -EFAULT;
status = mnt_want_write(filp->f_path.mnt);
if (status)
return status;
status = ocfs2_set_inode_attr(inode, flags,
OCFS2_FL_MODIFIABLE);
mnt_drop_write(filp->f_path.mnt);
return status;
case OCFS2_IOC_RESVSP:
case OCFS2_IOC_RESVSP64:
case OCFS2_IOC_UNRESVSP:
case OCFS2_IOC_UNRESVSP64:
if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
return -EFAULT;
return ocfs2_change_file_space(filp, cmd, &sr);
case OCFS2_IOC_GROUP_EXTEND:
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
if (get_user(new_clusters, (int __user *)arg))
return -EFAULT;
return ocfs2_group_extend(inode, new_clusters);
case OCFS2_IOC_GROUP_ADD:
case OCFS2_IOC_GROUP_ADD64:
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
return -EFAULT;
return ocfs2_group_add(inode, &input);
case OCFS2_IOC_REFLINK:
if (copy_from_user(&args, (struct reflink_arguments *)arg,
sizeof(args)))
return -EFAULT;
old_path = (const char *)(unsigned long)args.old_path;
new_path = (const char *)(unsigned long)args.new_path;
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;
}
}
#ifdef CONFIG_COMPAT
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:
cmd = OCFS2_IOC_GETFLAGS;
break;
case OCFS2_IOC32_SETFLAGS:
cmd = OCFS2_IOC_SETFLAGS;
break;
case OCFS2_IOC_RESVSP:
case OCFS2_IOC_RESVSP64:
case OCFS2_IOC_UNRESVSP:
case OCFS2_IOC_UNRESVSP64:
case OCFS2_IOC_GROUP_EXTEND:
case OCFS2_IOC_GROUP_ADD:
case OCFS2_IOC_GROUP_ADD64:
break;
case OCFS2_IOC_REFLINK:
if (copy_from_user(&args, (struct reflink_arguments *)arg,
sizeof(args)))
return -EFAULT;
preserve = (args.preserve != 0);
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;
}
return ocfs2_ioctl(file, cmd, arg);
}
#endif
Reference in a new issue View git blame Copy permalink