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-rw-r--r--fs/ocfs2/ioctl.c975
1 files changed, 975 insertions, 0 deletions
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
new file mode 100644
index 000000000..afd54ec66
--- /dev/null
+++ b/fs/ocfs2/ioctl.c
@@ -0,0 +1,975 @@
+// 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 <linux/fileattr.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));
+}
+
+int ocfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+{
+ struct inode *inode = d_inode(dentry);
+ unsigned int 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);
+
+ fileattr_fill_flags(fa, flags & OCFS2_FL_VISIBLE);
+
+ return status;
+}
+
+int ocfs2_fileattr_set(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct fileattr *fa)
+{
+ struct inode *inode = d_inode(dentry);
+ unsigned int flags = fa->flags;
+ 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;
+
+ if (fileattr_has_fsx(fa))
+ return -EOPNOTSUPP;
+
+ status = ocfs2_inode_lock(inode, &bh, 1);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ if (!S_ISDIR(inode->i_mode))
+ flags &= ~OCFS2_DIRSYNC_FL;
+
+ oldflags = ocfs2_inode->ip_attr;
+ flags = flags & OCFS2_FL_MODIFIABLE;
+ flags |= oldflags & ~OCFS2_FL_MODIFIABLE;
+
+ /* Check already done by VFS, but repeat with ocfs lock */
+ status = -EPERM;
+ if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
+ !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:
+ 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 (inode_alloc && 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)
+{
+ u32 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);
+ 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_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 fstrim_range range;
+ int ret = 0;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!bdev_max_discard_sectors(sb->s_bdev))
+ return -EOPNOTSUPP;
+
+ if (copy_from_user(&range, argp, sizeof(range)))
+ return -EFAULT;
+
+ range.minlen = max_t(u64, bdev_discard_granularity(sb->s_bdev),
+ 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_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 FITRIM:
+ case OCFS2_IOC_MOVE_EXT:
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return ocfs2_ioctl(file, cmd, arg);
+}
+#endif