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linux-next/fs/ocfs2/ioctl.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

1004 lines
23 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* 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/blkdev.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 "move_extents.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 is 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;
inode_lock(inode);
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;
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;
}
handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
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:
inode_unlock(inode);
brelse(bh);
return status;
}
static int ocfs2_info_handle_blocksize(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_blocksize oib;
if (o2info_from_user(oib, req))
return -EFAULT;
oib.ib_blocksize = inode->i_sb->s_blocksize;
o2info_set_request_filled(&oib.ib_req);
if (o2info_to_user(oib, req))
return -EFAULT;
return 0;
}
static int ocfs2_info_handle_clustersize(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_clustersize oic;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oic, req))
return -EFAULT;
oic.ic_clustersize = osb->s_clustersize;
o2info_set_request_filled(&oic.ic_req);
if (o2info_to_user(oic, req))
return -EFAULT;
return 0;
}
static int ocfs2_info_handle_maxslots(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_maxslots oim;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oim, req))
return -EFAULT;
oim.im_max_slots = osb->max_slots;
o2info_set_request_filled(&oim.im_req);
if (o2info_to_user(oim, req))
return -EFAULT;
return 0;
}
static int ocfs2_info_handle_label(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_label oil;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oil, req))
return -EFAULT;
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))
return -EFAULT;
return 0;
}
static int ocfs2_info_handle_uuid(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_uuid oiu;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oiu, req))
return -EFAULT;
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))
return -EFAULT;
return 0;
}
static int ocfs2_info_handle_fs_features(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_fs_features oif;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oif, req))
return -EFAULT;
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))
return -EFAULT;
return 0;
}
static int ocfs2_info_handle_journal_size(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_journal_size oij;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (o2info_from_user(oij, req))
return -EFAULT;
oij.ij_journal_size = i_size_read(osb->journal->j_inode);
o2info_set_request_filled(&oij.ij_req);
if (o2info_to_user(oij, req))
return -EFAULT;
return 0;
}
static 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)
inode_lock(inode_alloc);
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)
inode_unlock(inode_alloc);
brelse(bh);
return status;
}
static int ocfs2_info_handle_freeinode(struct inode *inode,
struct ocfs2_info_request __user *req)
{
u32 i;
u64 blkno = -1;
char namebuf[40];
int status, 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 out_err;
}
if (o2info_from_user(*oifi, req)) {
status = -EFAULT;
goto out_free;
}
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);
iput(inode_alloc);
inode_alloc = NULL;
if (status < 0)
goto bail;
}
o2info_set_request_filled(&oifi->ifi_req);
if (o2info_to_user(*oifi, req)) {
status = -EFAULT;
goto out_free;
}
status = 0;
bail:
if (status)
o2info_set_request_error(&oifi->ifi_req, req);
out_free:
kfree(oifi);
out_err:
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++;
}
static 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);
}
static 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;
}
static 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)
inode_lock(gb_inode);
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)
inode_unlock(gb_inode);
iput(gb_inode);
brelse(bh);
return status;
}
static int ocfs2_info_handle_freefrag(struct inode *inode,
struct ocfs2_info_request __user *req)
{
u64 blkno = -1;
char namebuf[40];
int status, 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 out_err;
}
if (o2info_from_user(*oiff, req)) {
status = -EFAULT;
goto out_free;
}
/*
* 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)) {
status = -EFAULT;
goto out_free;
}
status = 0;
bail:
if (status)
o2info_set_request_error(&oiff->iff_req, req);
out_free:
kfree(oiff);
out_err:
return status;
}
static int ocfs2_info_handle_unknown(struct inode *inode,
struct ocfs2_info_request __user *req)
{
struct ocfs2_info_request oir;
if (o2info_from_user(oir, req))
return -EFAULT;
o2info_clear_request_filled(&oir);
if (o2info_to_user(oir, req))
return -EFAULT;
return 0;
}
/*
* Validate and distinguish OCFS2_IOC_INFO requests.
*
* - validate the magic number.
* - distinguish different requests.
* - validate size of different requests.
*/
static 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;
}
static 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.
*/
static 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 __user *)(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 = file_inode(filp);
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 __user *old_path;
const char __user *new_path;
bool preserve;
struct ocfs2_info info;
void __user *argp = (void __user *)arg;
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_file(filp);
if (status)
return status;
status = ocfs2_set_inode_attr(inode, flags,
OCFS2_FL_MODIFIABLE);
mnt_drop_write_file(filp);
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;
status = mnt_want_write_file(filp);
if (status)
return status;
status = ocfs2_group_extend(inode, new_clusters);
mnt_drop_write_file(filp);
return status;
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;
status = mnt_want_write_file(filp);
if (status)
return status;
status = ocfs2_group_add(inode, &input);
mnt_drop_write_file(filp);
return status;
case OCFS2_IOC_REFLINK:
if (copy_from_user(&args, argp, sizeof(args)))
return -EFAULT;
old_path = (const char __user *)(unsigned long)args.old_path;
new_path = (const char __user *)(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, argp, sizeof(struct ocfs2_info)))
return -EFAULT;
return ocfs2_info_handle(inode, &info, 0);
case FITRIM:
{
struct super_block *sb = inode->i_sb;
struct request_queue *q = bdev_get_queue(sb->s_bdev);
struct fstrim_range range;
int ret = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
if (copy_from_user(&range, argp, sizeof(range)))
return -EFAULT;
range.minlen = max_t(u64, q->limits.discard_granularity,
range.minlen);
ret = ocfs2_trim_fs(sb, &range);
if (ret < 0)
return ret;
if (copy_to_user(argp, &range, sizeof(range)))
return -EFAULT;
return 0;
}
case OCFS2_IOC_MOVE_EXT:
return ocfs2_ioctl_move_extents(filp, argp);
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_inode(file);
struct ocfs2_info info;
void __user *argp = (void __user *)arg;
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, argp, 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, argp, sizeof(struct ocfs2_info)))
return -EFAULT;
return ocfs2_info_handle(inode, &info, 1);
case OCFS2_IOC_MOVE_EXT:
break;
default:
return -ENOIOCTLCMD;
}
return ocfs2_ioctl(file, cmd, arg);
}
#endif
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