#include <linux/pagemap.h>
#include <linux/uio.h>
#include <linux/sched.h>
-#include <linux/pipe_fs_i.h>
+#include <linux/splice.h>
#include <linux/mount.h>
+#include <linux/writeback.h>
+#include <linux/falloc.h>
#define MLOG_MASK_PREFIX ML_INODE
#include <cluster/masklog.h>
int ret;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
handle_t *handle;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
mlog_entry_void();
goto out;
}
+ ret = ocfs2_journal_access(handle, inode, bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ /*
+ * Don't use ocfs2_mark_inode_dirty() here as we don't always
+ * have i_mutex to guard against concurrent changes to other
+ * inode fields.
+ */
inode->i_atime = CURRENT_TIME;
- ret = ocfs2_mark_inode_dirty(handle, inode, bh);
+ di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
+ di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
+
+ ret = ocfs2_journal_dirty(handle, bh);
if (ret < 0)
mlog_errno(ret);
+out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
mlog_exit(ret);
return ret;
}
-int ocfs2_set_inode_size(handle_t *handle,
- struct inode *inode,
- struct buffer_head *fe_bh,
- u64 new_i_size)
+static int ocfs2_set_inode_size(handle_t *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ u64 new_i_size)
{
int status;
mlog_entry_void();
i_size_write(inode, new_i_size);
- inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
+ inode->i_blocks = ocfs2_inode_sector_count(inode);
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
{
int status;
handle_t *handle;
+ struct ocfs2_dinode *di;
+ u64 cluster_bytes;
mlog_entry_void();
goto out;
}
- status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size);
+ status = ocfs2_journal_access(handle, inode, fe_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out_commit;
+ }
+
+ /*
+ * Do this before setting i_size.
+ */
+ cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
+ status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
+ cluster_bytes);
+ if (status) {
+ mlog_errno(status);
+ goto out_commit;
+ }
+
+ i_size_write(inode, new_i_size);
+ inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+
+ di = (struct ocfs2_dinode *) fe_bh->b_data;
+ di->i_size = cpu_to_le64(new_i_size);
+ di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
+ di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
+
+ status = ocfs2_journal_dirty(handle, fe_bh);
if (status < 0)
mlog_errno(status);
+out_commit:
ocfs2_commit_trans(osb, handle);
out:
+
mlog_exit(status);
return status;
}
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(unsigned long long)new_i_size);
- truncate_inode_pages(inode->i_mapping, new_i_size);
-
fe = (struct ocfs2_dinode *) di_bh->b_data;
if (!OCFS2_IS_VALID_DINODE(fe)) {
OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
if (new_i_size == le64_to_cpu(fe->i_size))
goto bail;
+ down_write(&OCFS2_I(inode)->ip_alloc_sem);
+
/* This forces other nodes to sync and drop their pages. Do
* this even if we have a truncate without allocation change -
* ocfs2 cluster sizes can be much greater than page size, so
* we have to truncate them anyway. */
status = ocfs2_data_lock(inode, 1);
if (status < 0) {
+ up_write(&OCFS2_I(inode)->ip_alloc_sem);
+
mlog_errno(status);
goto bail;
}
- ocfs2_data_unlock(inode, 1);
- if (le32_to_cpu(fe->i_clusters) ==
- ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
- mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
- fe->i_clusters);
- /* No allocation change is required, so lets fast path
- * this truncate. */
- status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
- if (status < 0)
- mlog_errno(status);
- goto bail;
- }
+ unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
+ truncate_inode_pages(inode->i_mapping, new_i_size);
/* alright, we're going to need to do a full blown alloc size
* change. Orphan the inode so that recovery can complete the
status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
if (status < 0) {
mlog_errno(status);
- goto bail;
+ goto bail_unlock_data;
}
status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
if (status < 0) {
mlog_errno(status);
- goto bail;
+ goto bail_unlock_data;
}
status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
if (status < 0) {
mlog_errno(status);
- goto bail;
+ goto bail_unlock_data;
}
/* TODO: orphan dir cleanup here. */
+bail_unlock_data:
+ ocfs2_data_unlock(inode, 1);
+
+ up_write(&OCFS2_I(inode)->ip_alloc_sem);
+
bail:
mlog_exit(status);
*/
int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
struct inode *inode,
+ u32 *logical_offset,
u32 clusters_to_add,
+ int mark_unwritten,
struct buffer_head *fe_bh,
handle_t *handle,
struct ocfs2_alloc_context *data_ac,
enum ocfs2_alloc_restarted reason = RESTART_NONE;
u32 bit_off, num_bits;
u64 block;
+ u8 flags = 0;
BUG_ON(!clusters_to_add);
+ if (mark_unwritten)
+ flags = OCFS2_EXT_UNWRITTEN;
+
free_extents = ocfs2_num_free_extents(osb, inode, fe);
if (free_extents < 0) {
status = free_extents;
block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
- status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
- num_bits, meta_ac);
+ status = ocfs2_insert_extent(osb, handle, inode, fe_bh,
+ *logical_offset, block, num_bits,
+ flags, meta_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
- le32_add_cpu(&fe->i_clusters, num_bits);
- spin_lock(&OCFS2_I(inode)->ip_lock);
- OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
- spin_unlock(&OCFS2_I(inode)->ip_lock);
-
status = ocfs2_journal_dirty(handle, fe_bh);
if (status < 0) {
mlog_errno(status);
}
clusters_to_add -= num_bits;
+ *logical_offset += num_bits;
if (clusters_to_add) {
mlog(0, "need to alloc once more, clusters = %u, wanted = "
return status;
}
-static int ocfs2_extend_allocation(struct inode *inode,
- u32 clusters_to_add)
+/*
+ * For a given allocation, determine which allocators will need to be
+ * accessed, and lock them, reserving the appropriate number of bits.
+ *
+ * Sparse file systems call this from ocfs2_write_begin_nolock()
+ * and ocfs2_allocate_unwritten_extents().
+ *
+ * File systems which don't support holes call this from
+ * ocfs2_extend_allocation().
+ */
+int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
+ u32 clusters_to_add, u32 extents_to_split,
+ struct ocfs2_alloc_context **data_ac,
+ struct ocfs2_alloc_context **meta_ac)
+{
+ int ret = 0, num_free_extents;
+ unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ *meta_ac = NULL;
+ if (data_ac)
+ *data_ac = NULL;
+
+ BUG_ON(clusters_to_add != 0 && data_ac == NULL);
+
+ mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
+ "clusters_to_add = %u, extents_to_split = %u\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
+ le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);
+
+ num_free_extents = ocfs2_num_free_extents(osb, inode, di);
+ if (num_free_extents < 0) {
+ ret = num_free_extents;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Sparse allocation file systems need to be more conservative
+ * with reserving room for expansion - the actual allocation
+ * happens while we've got a journal handle open so re-taking
+ * a cluster lock (because we ran out of room for another
+ * extent) will violate ordering rules.
+ *
+ * Most of the time we'll only be seeing this 1 cluster at a time
+ * anyway.
+ *
+ * Always lock for any unwritten extents - we might want to
+ * add blocks during a split.
+ */
+ if (!num_free_extents ||
+ (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
+ ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ if (clusters_to_add == 0)
+ goto out;
+
+ ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+
+out:
+ if (ret) {
+ if (*meta_ac) {
+ ocfs2_free_alloc_context(*meta_ac);
+ *meta_ac = NULL;
+ }
+
+ /*
+ * We cannot have an error and a non null *data_ac.
+ */
+ }
+
+ return ret;
+}
+
+static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
+ u32 clusters_to_add, int mark_unwritten)
{
int status = 0;
int restart_func = 0;
- int drop_alloc_sem = 0;
- int credits, num_free_extents;
+ int credits;
u32 prev_clusters;
struct buffer_head *bh = NULL;
struct ocfs2_dinode *fe = NULL;
mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
+ /*
+ * This function only exists for file systems which don't
+ * support holes.
+ */
+ BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
+
status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
OCFS2_BH_CACHED, inode);
if (status < 0) {
restart_all:
BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
- mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, "
- "clusters_to_add = %u\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
- fe->i_clusters, clusters_to_add);
-
- num_free_extents = ocfs2_num_free_extents(osb,
- inode,
- fe);
- if (num_free_extents < 0) {
- status = num_free_extents;
+ status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac,
+ &meta_ac);
+ if (status) {
mlog_errno(status);
goto leave;
}
- if (!num_free_extents) {
- status = ocfs2_reserve_new_metadata(osb, fe, &meta_ac);
- if (status < 0) {
- if (status != -ENOSPC)
- mlog_errno(status);
- goto leave;
- }
- }
-
- status = ocfs2_reserve_clusters(osb, clusters_to_add, &data_ac);
- if (status < 0) {
- if (status != -ENOSPC)
- mlog_errno(status);
- goto leave;
- }
-
- /* blocks peope in read/write from reading our allocation
- * until we're done changing it. We depend on i_mutex to block
- * other extend/truncate calls while we're here. Ordering wrt
- * start_trans is important here -- always do it before! */
- down_write(&OCFS2_I(inode)->ip_alloc_sem);
- drop_alloc_sem = 1;
-
credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = ocfs2_do_extend_allocation(osb,
inode,
+ &logical_start,
clusters_to_add,
+ mark_unwritten,
bh,
handle,
data_ac,
}
mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
- fe->i_clusters, (unsigned long long)fe->i_size);
+ le32_to_cpu(fe->i_clusters),
+ (unsigned long long)le64_to_cpu(fe->i_size));
mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
OCFS2_I(inode)->ip_clusters, i_size_read(inode));
leave:
- if (drop_alloc_sem) {
- up_write(&OCFS2_I(inode)->ip_alloc_sem);
- drop_alloc_sem = 0;
- }
if (handle) {
ocfs2_commit_trans(osb, handle);
handle = NULL;
return status;
}
+static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
+ u32 clusters_to_add, int mark_unwritten)
+{
+ int ret;
+
+ /*
+ * The alloc sem blocks peope in read/write from reading our
+ * allocation until we're done changing it. We depend on
+ * i_mutex to block other extend/truncate calls while we're
+ * here.
+ */
+ down_write(&OCFS2_I(inode)->ip_alloc_sem);
+ ret = __ocfs2_extend_allocation(inode, logical_start, clusters_to_add,
+ mark_unwritten);
+ up_write(&OCFS2_I(inode)->ip_alloc_sem);
+
+ return ret;
+}
+
/* Some parts of this taken from generic_cont_expand, which turned out
* to be too fragile to do exactly what we need without us having to
* worry about recursive locking in ->prepare_write() and
size_t tail_to_skip)
{
int ret = 0;
- u32 clusters_to_add;
+ u32 clusters_to_add = 0;
BUG_ON(!tail_to_skip && !di_bh);
goto out;
BUG_ON(new_i_size < i_size_read(inode));
+ if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
+ BUG_ON(tail_to_skip != 0);
+ goto out_update_size;
+ }
+
clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
OCFS2_I(inode)->ip_clusters;
}
if (clusters_to_add) {
- ret = ocfs2_extend_allocation(inode, clusters_to_add);
+ ret = ocfs2_extend_allocation(inode,
+ OCFS2_I(inode)->ip_clusters,
+ clusters_to_add, 0);
if (ret < 0) {
mlog_errno(ret);
goto out_unlock;
goto out_unlock;
}
+out_update_size:
if (!tail_to_skip) {
/* We're being called from ocfs2_setattr() which wants
* us to update i_size */
}
out_unlock:
- ocfs2_data_unlock(inode, 1);
+ if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
+ ocfs2_data_unlock(inode, 1);
out:
return ret;
}
if (size_change && attr->ia_size != i_size_read(inode)) {
+ if (attr->ia_size > sb->s_maxbytes) {
+ status = -EFBIG;
+ goto bail_unlock;
+ }
+
if (i_size_read(inode) > attr->ia_size)
status = ocfs2_truncate_file(inode, bh, attr->ia_size);
else
goto bail_unlock;
}
+ /*
+ * This will intentionally not wind up calling vmtruncate(),
+ * since all the work for a size change has been done above.
+ * Otherwise, we could get into problems with truncate as
+ * ip_alloc_sem is used there to protect against i_size
+ * changes.
+ */
status = inode_setattr(inode, attr);
if (status < 0) {
mlog_errno(status);
ret = ocfs2_meta_lock(inode, NULL, 0);
if (ret) {
- mlog_errno(ret);
+ if (ret != -ENOENT)
+ mlog_errno(ret);
goto out;
}
return ret;
}
-static int ocfs2_write_remove_suid(struct inode *inode)
+static int __ocfs2_write_remove_suid(struct inode *inode,
+ struct buffer_head *bh)
{
int ret;
- struct buffer_head *bh = NULL;
- struct ocfs2_inode_info *oi = OCFS2_I(inode);
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_dinode *di;
mlog_entry("(Inode %llu, mode 0%o)\n",
- (unsigned long long)oi->ip_blkno, inode->i_mode);
+ (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
if (handle == NULL) {
goto out;
}
- ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
- if (ret < 0) {
- mlog_errno(ret);
- goto out_trans;
- }
-
ret = ocfs2_journal_access(handle, inode, bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
- goto out_bh;
+ goto out_trans;
}
inode->i_mode &= ~S_ISUID;
ret = ocfs2_journal_dirty(handle, bh);
if (ret < 0)
mlog_errno(ret);
-out_bh:
- brelse(bh);
+
out_trans:
ocfs2_commit_trans(osb, handle);
out:
return ret;
}
-static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
- loff_t *ppos,
- size_t count,
- int appending)
+/*
+ * Will look for holes and unwritten extents in the range starting at
+ * pos for count bytes (inclusive).
+ */
+static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
+ size_t count)
{
- int ret = 0, meta_level = appending;
- struct inode *inode = dentry->d_inode;
- u32 clusters;
- loff_t newsize, saved_pos;
+ int ret = 0;
+ unsigned int extent_flags;
+ u32 cpos, clusters, extent_len, phys_cpos;
+ struct super_block *sb = inode->i_sb;
- /*
- * We sample i_size under a read level meta lock to see if our write
- * is extending the file, if it is we back off and get a write level
- * meta lock.
- */
- for(;;) {
- ret = ocfs2_meta_lock(inode, NULL, meta_level);
+ cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
+ clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
+
+ while (clusters) {
+ ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
+ &extent_flags);
if (ret < 0) {
- meta_level = -1;
mlog_errno(ret);
goto out;
}
- /* Clear suid / sgid if necessary. We do this here
- * instead of later in the write path because
- * remove_suid() calls ->setattr without any hint that
- * we may have already done our cluster locking. Since
- * ocfs2_setattr() *must* take cluster locks to
- * proceeed, this will lead us to recursively lock the
- * inode. There's also the dinode i_size state which
- * can be lost via setattr during extending writes (we
- * set inode->i_size at the end of a write. */
- if (should_remove_suid(dentry)) {
- if (meta_level == 0) {
- ocfs2_meta_unlock(inode, meta_level);
- meta_level = 1;
- continue;
- }
-
- ret = ocfs2_write_remove_suid(inode);
- if (ret < 0) {
- mlog_errno(ret);
- goto out_unlock;
- }
- }
-
- /* work on a copy of ppos until we're sure that we won't have
- * to recalculate it due to relocking. */
- if (appending) {
- saved_pos = i_size_read(inode);
- mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
- } else {
- saved_pos = *ppos;
- }
- newsize = count + saved_pos;
-
- mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
- (long long) saved_pos, (long long) newsize,
- (long long) i_size_read(inode));
-
- /* No need for a higher level metadata lock if we're
- * never going past i_size. */
- if (newsize <= i_size_read(inode))
+ if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
+ ret = 1;
break;
-
- if (meta_level == 0) {
- ocfs2_meta_unlock(inode, meta_level);
- meta_level = 1;
- continue;
}
- spin_lock(&OCFS2_I(inode)->ip_lock);
- clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
- OCFS2_I(inode)->ip_clusters;
- spin_unlock(&OCFS2_I(inode)->ip_lock);
-
- mlog(0, "Writing at EOF, may need more allocation: "
- "i_size = %lld, newsize = %lld, need %u clusters\n",
- (long long) i_size_read(inode), (long long) newsize,
- clusters);
-
- /* We only want to continue the rest of this loop if
- * our extend will actually require more
- * allocation. */
- if (!clusters)
- break;
+ if (extent_len > clusters)
+ extent_len = clusters;
- ret = ocfs2_extend_file(inode, NULL, newsize, count);
- if (ret < 0) {
- if (ret != -ENOSPC)
- mlog_errno(ret);
- goto out_unlock;
- }
- break;
+ clusters -= extent_len;
+ cpos += extent_len;
}
+out:
+ return ret;
+}
- if (appending)
- *ppos = saved_pos;
+static int ocfs2_write_remove_suid(struct inode *inode)
+{
+ int ret;
+ struct buffer_head *bh = NULL;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
-out_unlock:
- ocfs2_meta_unlock(inode, meta_level);
+ ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
+ oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ ret = __ocfs2_write_remove_suid(inode, bh);
out:
+ brelse(bh);
return ret;
}
-static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs,
- loff_t pos)
+/*
+ * Allocate enough extents to cover the region starting at byte offset
+ * start for len bytes. Existing extents are skipped, any extents
+ * added are marked as "unwritten".
+ */
+static int ocfs2_allocate_unwritten_extents(struct inode *inode,
+ u64 start, u64 len)
{
- int ret, rw_level, have_alloc_sem = 0;
- struct file *filp = iocb->ki_filp;
- struct inode *inode = filp->f_path.dentry->d_inode;
- int appending = filp->f_flags & O_APPEND ? 1 : 0;
+ int ret;
+ u32 cpos, phys_cpos, clusters, alloc_size;
- mlog_entry("(0x%p, %u, '%.*s')\n", filp,
+ /*
+ * We consider both start and len to be inclusive.
+ */
+ cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
+ clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
+ clusters -= cpos;
+
+ while (clusters) {
+ ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
+ &alloc_size, NULL);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Hole or existing extent len can be arbitrary, so
+ * cap it to our own allocation request.
+ */
+ if (alloc_size > clusters)
+ alloc_size = clusters;
+
+ if (phys_cpos) {
+ /*
+ * We already have an allocation at this
+ * region so we can safely skip it.
+ */
+ goto next;
+ }
+
+ ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
+ if (ret) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+
+next:
+ cpos += alloc_size;
+ clusters -= alloc_size;
+ }
+
+ ret = 0;
+out:
+ return ret;
+}
+
+static int __ocfs2_remove_inode_range(struct inode *inode,
+ struct buffer_head *di_bh,
+ u32 cpos, u32 phys_cpos, u32 len,
+ struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+ int ret;
+ u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct inode *tl_inode = osb->osb_tl_inode;
+ handle_t *handle;
+ struct ocfs2_alloc_context *meta_ac = NULL;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+ ret = ocfs2_lock_allocators(inode, di, 0, 1, NULL, &meta_ac);
+ if (ret) {
+ mlog_errno(ret);
+ return ret;
+ }
+
+ mutex_lock(&tl_inode->i_mutex);
+
+ if (ocfs2_truncate_log_needs_flush(osb)) {
+ ret = __ocfs2_flush_truncate_log(osb);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
+ if (handle == NULL) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access(handle, inode, di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_remove_extent(inode, di_bh, cpos, len, handle, meta_ac,
+ dealloc);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ OCFS2_I(inode)->ip_clusters -= len;
+ di->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
+
+ ret = ocfs2_journal_dirty(handle, di_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
+ if (ret)
+ mlog_errno(ret);
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+out:
+ mutex_unlock(&tl_inode->i_mutex);
+
+ if (meta_ac)
+ ocfs2_free_alloc_context(meta_ac);
+
+ return ret;
+}
+
+/*
+ * Truncate a byte range, avoiding pages within partial clusters. This
+ * preserves those pages for the zeroing code to write to.
+ */
+static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
+ u64 byte_len)
+{
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ loff_t start, end;
+ struct address_space *mapping = inode->i_mapping;
+
+ start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
+ end = byte_start + byte_len;
+ end = end & ~(osb->s_clustersize - 1);
+
+ if (start < end) {
+ unmap_mapping_range(mapping, start, end - start, 0);
+ truncate_inode_pages_range(mapping, start, end - 1);
+ }
+}
+
+static int ocfs2_zero_partial_clusters(struct inode *inode,
+ u64 start, u64 len)
+{
+ int ret = 0;
+ u64 tmpend, end = start + len;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ unsigned int csize = osb->s_clustersize;
+ handle_t *handle;
+
+ /*
+ * The "start" and "end" values are NOT necessarily part of
+ * the range whose allocation is being deleted. Rather, this
+ * is what the user passed in with the request. We must zero
+ * partial clusters here. There's no need to worry about
+ * physical allocation - the zeroing code knows to skip holes.
+ */
+ mlog(0, "byte start: %llu, end: %llu\n",
+ (unsigned long long)start, (unsigned long long)end);
+
+ /*
+ * If both edges are on a cluster boundary then there's no
+ * zeroing required as the region is part of the allocation to
+ * be truncated.
+ */
+ if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
+ goto out;
+
+ handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+ if (handle == NULL) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * We want to get the byte offset of the end of the 1st cluster.
+ */
+ tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
+ if (tmpend > end)
+ tmpend = end;
+
+ mlog(0, "1st range: start: %llu, tmpend: %llu\n",
+ (unsigned long long)start, (unsigned long long)tmpend);
+
+ ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
+ if (ret)
+ mlog_errno(ret);
+
+ if (tmpend < end) {
+ /*
+ * This may make start and end equal, but the zeroing
+ * code will skip any work in that case so there's no
+ * need to catch it up here.
+ */
+ start = end & ~(osb->s_clustersize - 1);
+
+ mlog(0, "2nd range: start: %llu, end: %llu\n",
+ (unsigned long long)start, (unsigned long long)end);
+
+ ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
+ if (ret)
+ mlog_errno(ret);
+ }
+
+ ocfs2_commit_trans(osb, handle);
+out:
+ return ret;
+}
+
+static int ocfs2_remove_inode_range(struct inode *inode,
+ struct buffer_head *di_bh, u64 byte_start,
+ u64 byte_len)
+{
+ int ret = 0;
+ u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_cached_dealloc_ctxt dealloc;
+
+ ocfs2_init_dealloc_ctxt(&dealloc);
+
+ if (byte_len == 0)
+ return 0;
+
+ trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
+ trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits;
+ if (trunc_len >= trunc_start)
+ trunc_len -= trunc_start;
+ else
+ trunc_len = 0;
+
+ mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ (unsigned long long)byte_start,
+ (unsigned long long)byte_len, trunc_start, trunc_len);
+
+ ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ cpos = trunc_start;
+ while (trunc_len) {
+ ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
+ &alloc_size, NULL);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (alloc_size > trunc_len)
+ alloc_size = trunc_len;
+
+ /* Only do work for non-holes */
+ if (phys_cpos != 0) {
+ ret = __ocfs2_remove_inode_range(inode, di_bh, cpos,
+ phys_cpos, alloc_size,
+ &dealloc);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ cpos += alloc_size;
+ trunc_len -= alloc_size;
+ }
+
+ ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
+
+out:
+ ocfs2_schedule_truncate_log_flush(osb, 1);
+ ocfs2_run_deallocs(osb, &dealloc);
+
+ return ret;
+}
+
+/*
+ * Parts of this function taken from xfs_change_file_space()
+ */
+static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
+ loff_t f_pos, unsigned int cmd,
+ struct ocfs2_space_resv *sr,
+ int change_size)
+{
+ int ret;
+ s64 llen;
+ loff_t size;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct buffer_head *di_bh = NULL;
+ handle_t *handle;
+ unsigned long long max_off = inode->i_sb->s_maxbytes;
+
+ if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
+ return -EROFS;
+
+ mutex_lock(&inode->i_mutex);
+
+ /*
+ * This prevents concurrent writes on other nodes
+ */
+ ret = ocfs2_rw_lock(inode, 1);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_meta_lock(inode, &di_bh, 1);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_rw_unlock;
+ }
+
+ if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
+ ret = -EPERM;
+ goto out_meta_unlock;
+ }
+
+ switch (sr->l_whence) {
+ case 0: /*SEEK_SET*/
+ break;
+ case 1: /*SEEK_CUR*/
+ sr->l_start += f_pos;
+ break;
+ case 2: /*SEEK_END*/
+ sr->l_start += i_size_read(inode);
+ break;
+ default:
+ ret = -EINVAL;
+ goto out_meta_unlock;
+ }
+ sr->l_whence = 0;
+
+ llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
+
+ if (sr->l_start < 0
+ || sr->l_start > max_off
+ || (sr->l_start + llen) < 0
+ || (sr->l_start + llen) > max_off) {
+ ret = -EINVAL;
+ goto out_meta_unlock;
+ }
+ size = sr->l_start + sr->l_len;
+
+ if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
+ if (sr->l_len <= 0) {
+ ret = -EINVAL;
+ goto out_meta_unlock;
+ }
+ }
+
+ if (file && should_remove_suid(file->f_path.dentry)) {
+ ret = __ocfs2_write_remove_suid(inode, di_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_meta_unlock;
+ }
+ }
+
+ down_write(&OCFS2_I(inode)->ip_alloc_sem);
+ switch (cmd) {
+ case OCFS2_IOC_RESVSP:
+ case OCFS2_IOC_RESVSP64:
+ /*
+ * This takes unsigned offsets, but the signed ones we
+ * pass have been checked against overflow above.
+ */
+ ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
+ sr->l_len);
+ break;
+ case OCFS2_IOC_UNRESVSP:
+ case OCFS2_IOC_UNRESVSP64:
+ ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
+ sr->l_len);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ up_write(&OCFS2_I(inode)->ip_alloc_sem);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_meta_unlock;
+ }
+
+ /*
+ * We update c/mtime for these changes
+ */
+ handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out_meta_unlock;
+ }
+
+ if (change_size && i_size_read(inode) < size)
+ i_size_write(inode, size);
+
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+ ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
+ if (ret < 0)
+ mlog_errno(ret);
+
+ ocfs2_commit_trans(osb, handle);
+
+out_meta_unlock:
+ brelse(di_bh);
+ ocfs2_meta_unlock(inode, 1);
+out_rw_unlock:
+ ocfs2_rw_unlock(inode, 1);
+
+ mutex_unlock(&inode->i_mutex);
+out:
+ return ret;
+}
+
+int ocfs2_change_file_space(struct file *file, unsigned int cmd,
+ struct ocfs2_space_resv *sr)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);;
+
+ if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
+ !ocfs2_writes_unwritten_extents(osb))
+ return -ENOTTY;
+ else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
+ !ocfs2_sparse_alloc(osb))
+ return -ENOTTY;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EINVAL;
+
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EBADF;
+
+ return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
+}
+
+static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
+ loff_t len)
+{
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_space_resv sr;
+ int change_size = 1;
+
+ if (!ocfs2_writes_unwritten_extents(osb))
+ return -EOPNOTSUPP;
+
+ if (S_ISDIR(inode->i_mode))
+ return -ENODEV;
+
+ if (mode & FALLOC_FL_KEEP_SIZE)
+ change_size = 0;
+
+ sr.l_whence = 0;
+ sr.l_start = (s64)offset;
+ sr.l_len = (s64)len;
+
+ return __ocfs2_change_file_space(NULL, inode, offset,
+ OCFS2_IOC_RESVSP64, &sr, change_size);
+}
+
+static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
+ loff_t *ppos,
+ size_t count,
+ int appending,
+ int *direct_io)
+{
+ int ret = 0, meta_level = appending;
+ struct inode *inode = dentry->d_inode;
+ u32 clusters;
+ loff_t newsize, saved_pos;
+
+ /*
+ * We sample i_size under a read level meta lock to see if our write
+ * is extending the file, if it is we back off and get a write level
+ * meta lock.
+ */
+ for(;;) {
+ ret = ocfs2_meta_lock(inode, NULL, meta_level);
+ if (ret < 0) {
+ meta_level = -1;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /* Clear suid / sgid if necessary. We do this here
+ * instead of later in the write path because
+ * remove_suid() calls ->setattr without any hint that
+ * we may have already done our cluster locking. Since
+ * ocfs2_setattr() *must* take cluster locks to
+ * proceeed, this will lead us to recursively lock the
+ * inode. There's also the dinode i_size state which
+ * can be lost via setattr during extending writes (we
+ * set inode->i_size at the end of a write. */
+ if (should_remove_suid(dentry)) {
+ if (meta_level == 0) {
+ ocfs2_meta_unlock(inode, meta_level);
+ meta_level = 1;
+ continue;
+ }
+
+ ret = ocfs2_write_remove_suid(inode);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+ }
+
+ /* work on a copy of ppos until we're sure that we won't have
+ * to recalculate it due to relocking. */
+ if (appending) {
+ saved_pos = i_size_read(inode);
+ mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
+ } else {
+ saved_pos = *ppos;
+ }
+
+ if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
+ loff_t end = saved_pos + count;
+
+ /*
+ * Skip the O_DIRECT checks if we don't need
+ * them.
+ */
+ if (!direct_io || !(*direct_io))
+ break;
+
+ /*
+ * Allowing concurrent direct writes means
+ * i_size changes wouldn't be synchronized, so
+ * one node could wind up truncating another
+ * nodes writes.
+ */
+ if (end > i_size_read(inode)) {
+ *direct_io = 0;
+ break;
+ }
+
+ /*
+ * We don't fill holes during direct io, so
+ * check for them here. If any are found, the
+ * caller will have to retake some cluster
+ * locks and initiate the io as buffered.
+ */
+ ret = ocfs2_check_range_for_holes(inode, saved_pos,
+ count);
+ if (ret == 1) {
+ *direct_io = 0;
+ ret = 0;
+ } else if (ret < 0)
+ mlog_errno(ret);
+ break;
+ }
+
+ /*
+ * The rest of this loop is concerned with legacy file
+ * systems which don't support sparse files.
+ */
+
+ newsize = count + saved_pos;
+
+ mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
+ (long long) saved_pos, (long long) newsize,
+ (long long) i_size_read(inode));
+
+ /* No need for a higher level metadata lock if we're
+ * never going past i_size. */
+ if (newsize <= i_size_read(inode))
+ break;
+
+ if (meta_level == 0) {
+ ocfs2_meta_unlock(inode, meta_level);
+ meta_level = 1;
+ continue;
+ }
+
+ spin_lock(&OCFS2_I(inode)->ip_lock);
+ clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
+ OCFS2_I(inode)->ip_clusters;
+ spin_unlock(&OCFS2_I(inode)->ip_lock);
+
+ mlog(0, "Writing at EOF, may need more allocation: "
+ "i_size = %lld, newsize = %lld, need %u clusters\n",
+ (long long) i_size_read(inode), (long long) newsize,
+ clusters);
+
+ /* We only want to continue the rest of this loop if
+ * our extend will actually require more
+ * allocation. */
+ if (!clusters)
+ break;
+
+ ret = ocfs2_extend_file(inode, NULL, newsize, count);
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+ break;
+ }
+
+ if (appending)
+ *ppos = saved_pos;
+
+out_unlock:
+ ocfs2_meta_unlock(inode, meta_level);
+
+out:
+ return ret;
+}
+
+static inline void
+ocfs2_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes)
+{
+ const struct iovec *iov = *iovp;
+ size_t base = *basep;
+
+ do {
+ int copy = min(bytes, iov->iov_len - base);
+
+ bytes -= copy;
+ base += copy;
+ if (iov->iov_len == base) {
+ iov++;
+ base = 0;
+ }
+ } while (bytes);
+ *iovp = iov;
+ *basep = base;
+}
+
+static struct page * ocfs2_get_write_source(char **ret_src_buf,
+ const struct iovec *cur_iov,
+ size_t iov_offset)
+{
+ int ret;
+ char *buf = cur_iov->iov_base + iov_offset;
+ struct page *src_page = NULL;
+ unsigned long off;
+
+ off = (unsigned long)(buf) & ~PAGE_CACHE_MASK;
+
+ if (!segment_eq(get_fs(), KERNEL_DS)) {
+ /*
+ * Pull in the user page. We want to do this outside
+ * of the meta data locks in order to preserve locking
+ * order in case of page fault.
+ */
+ ret = get_user_pages(current, current->mm,
+ (unsigned long)buf & PAGE_CACHE_MASK, 1,
+ 0, 0, &src_page, NULL);
+ if (ret == 1)
+ *ret_src_buf = kmap(src_page) + off;
+ else
+ src_page = ERR_PTR(-EFAULT);
+ } else {
+ *ret_src_buf = buf;
+ }
+
+ return src_page;
+}
+
+static void ocfs2_put_write_source(struct page *page)
+{
+ if (page) {
+ kunmap(page);
+ page_cache_release(page);
+ }
+}
+
+static ssize_t ocfs2_file_buffered_write(struct file *file, loff_t *ppos,
+ const struct iovec *iov,
+ unsigned long nr_segs,
+ size_t count,
+ ssize_t o_direct_written)
+{
+ int ret = 0;
+ ssize_t copied, total = 0;
+ size_t iov_offset = 0, bytes;
+ loff_t pos;
+ const struct iovec *cur_iov = iov;
+ struct page *user_page, *page;
+ char * uninitialized_var(buf);
+ char *dst;
+ void *fsdata;
+
+ /*
+ * handle partial DIO write. Adjust cur_iov if needed.
+ */
+ ocfs2_set_next_iovec(&cur_iov, &iov_offset, o_direct_written);
+
+ do {
+ pos = *ppos;
+
+ user_page = ocfs2_get_write_source(&buf, cur_iov, iov_offset);
+ if (IS_ERR(user_page)) {
+ ret = PTR_ERR(user_page);
+ goto out;
+ }
+
+ /* Stay within our page boundaries */
+ bytes = min((PAGE_CACHE_SIZE - ((unsigned long)pos & ~PAGE_CACHE_MASK)),
+ (PAGE_CACHE_SIZE - ((unsigned long)buf & ~PAGE_CACHE_MASK)));
+ /* Stay within the vector boundary */
+ bytes = min_t(size_t, bytes, cur_iov->iov_len - iov_offset);
+ /* Stay within count */
+ bytes = min(bytes, count);
+
+ page = NULL;
+ ret = ocfs2_write_begin(file, file->f_mapping, pos, bytes, 0,
+ &page, &fsdata);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ dst = kmap_atomic(page, KM_USER0);
+ memcpy(dst + (pos & (loff_t)(PAGE_CACHE_SIZE - 1)), buf, bytes);
+ kunmap_atomic(dst, KM_USER0);
+ flush_dcache_page(page);
+ ocfs2_put_write_source(user_page);
+
+ copied = ocfs2_write_end(file, file->f_mapping, pos, bytes,
+ bytes, page, fsdata);
+ if (copied < 0) {
+ mlog_errno(copied);
+ ret = copied;
+ goto out;
+ }
+
+ total += copied;
+ *ppos = pos + copied;
+ count -= copied;
+
+ ocfs2_set_next_iovec(&cur_iov, &iov_offset, copied);
+ } while(count);
+
+out:
+ return total ? total : ret;
+}
+
+static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
+ const struct iovec *iov,
+ unsigned long nr_segs,
+ loff_t pos)
+{
+ int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
+ int can_do_direct, sync = 0;
+ ssize_t written = 0;
+ size_t ocount; /* original count */
+ size_t count; /* after file limit checks */
+ loff_t *ppos = &iocb->ki_pos;
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_path.dentry->d_inode;
+
+ mlog_entry("(0x%p, %u, '%.*s')\n", file,
(unsigned int)nr_segs,
- filp->f_path.dentry->d_name.len,
- filp->f_path.dentry->d_name.name);
+ file->f_path.dentry->d_name.len,
+ file->f_path.dentry->d_name.name);
- /* happy write of zero bytes */
if (iocb->ki_left == 0)
return 0;
+ ret = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
+ if (ret)
+ return ret;
+
+ count = ocount;
+
+ vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+
+ appending = file->f_flags & O_APPEND ? 1 : 0;
+ direct_io = file->f_flags & O_DIRECT ? 1 : 0;
+
mutex_lock(&inode->i_mutex);
+
+relock:
/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
- if (filp->f_flags & O_DIRECT) {
- have_alloc_sem = 1;
+ if (direct_io) {
down_read(&inode->i_alloc_sem);
+ have_alloc_sem = 1;
}
/* concurrent O_DIRECT writes are allowed */
- rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
+ rw_level = !direct_io;
ret = ocfs2_rw_lock(inode, rw_level);
if (ret < 0) {
- rw_level = -1;
mlog_errno(ret);
- goto out;
+ goto out_sems;
}
- ret = ocfs2_prepare_inode_for_write(filp->f_path.dentry, &iocb->ki_pos,
- iocb->ki_left, appending);
+ can_do_direct = direct_io;
+ ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
+ iocb->ki_left, appending,
+ &can_do_direct);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
- /* communicate with ocfs2_dio_end_io */
- ocfs2_iocb_set_rw_locked(iocb);
+ /*
+ * We can't complete the direct I/O as requested, fall back to
+ * buffered I/O.
+ */
+ if (direct_io && !can_do_direct) {
+ ocfs2_rw_unlock(inode, rw_level);
+ up_read(&inode->i_alloc_sem);
+
+ have_alloc_sem = 0;
+ rw_level = -1;
+
+ direct_io = 0;
+ sync = 1;
+ goto relock;
+ }
+
+ if (!sync && ((file->f_flags & O_SYNC) || IS_SYNC(inode)))
+ sync = 1;
+
+ /*
+ * XXX: Is it ok to execute these checks a second time?
+ */
+ ret = generic_write_checks(file, ppos, &count, S_ISBLK(inode->i_mode));
+ if (ret)
+ goto out;
- ret = generic_file_aio_write_nolock(iocb, iov, nr_segs, iocb->ki_pos);
+ /*
+ * Set pos so that sync_page_range_nolock() below understands
+ * where to start from. We might've moved it around via the
+ * calls above. The range we want to actually sync starts from
+ * *ppos here.
+ *
+ */
+ pos = *ppos;
+ /* communicate with ocfs2_dio_end_io */
+ ocfs2_iocb_set_rw_locked(iocb, rw_level);
+
+ if (direct_io) {
+ written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
+ ppos, count, ocount);
+ if (written < 0) {
+ ret = written;
+ goto out_dio;
+ }
+ } else {
+ written = ocfs2_file_buffered_write(file, ppos, iov, nr_segs,
+ count, written);
+ if (written < 0) {
+ ret = written;
+ if (ret != -EFAULT || ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+out_dio:
/* buffered aio wouldn't have proper lock coverage today */
- BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
+ BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
/*
* deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
}
out:
+ if (rw_level != -1)
+ ocfs2_rw_unlock(inode, rw_level);
+
+out_sems:
if (have_alloc_sem)
up_read(&inode->i_alloc_sem);
- if (rw_level != -1)
- ocfs2_rw_unlock(inode, rw_level);
+
+ if (written > 0 && sync) {
+ ssize_t err;
+
+ err = sync_page_range_nolock(inode, file->f_mapping, pos, count);
+ if (err < 0)
+ written = err;
+ }
+
mutex_unlock(&inode->i_mutex);
mlog_exit(ret);
+ return written ? written : ret;
+}
+
+static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf,
+ struct splice_desc *sd)
+{
+ int ret, count;
+ ssize_t copied = 0;
+ struct file *file = sd->u.file;
+ unsigned int offset;
+ struct page *page = NULL;
+ void *fsdata;
+ char *src, *dst;
+
+ ret = buf->ops->confirm(pipe, buf);
+ if (ret)
+ goto out;
+
+ offset = sd->pos & ~PAGE_CACHE_MASK;
+ count = sd->len;
+ if (count + offset > PAGE_CACHE_SIZE)
+ count = PAGE_CACHE_SIZE - offset;
+
+ ret = ocfs2_write_begin(file, file->f_mapping, sd->pos, count, 0,
+ &page, &fsdata);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ src = buf->ops->map(pipe, buf, 1);
+ dst = kmap_atomic(page, KM_USER1);
+ memcpy(dst + offset, src + buf->offset, count);
+ kunmap_atomic(dst, KM_USER1);
+ buf->ops->unmap(pipe, buf, src);
+
+ copied = ocfs2_write_end(file, file->f_mapping, sd->pos, count, count,
+ page, fsdata);
+ if (copied < 0) {
+ mlog_errno(copied);
+ ret = copied;
+ goto out;
+ }
+out:
+
+ return copied ? copied : ret;
+}
+
+static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe,
+ struct file *out,
+ loff_t *ppos,
+ size_t len,
+ unsigned int flags)
+{
+ int ret, err;
+ struct address_space *mapping = out->f_mapping;
+ struct inode *inode = mapping->host;
+ struct splice_desc sd = {
+ .total_len = len,
+ .flags = flags,
+ .pos = *ppos,
+ .u.file = out,
+ };
+
+ ret = __splice_from_pipe(pipe, &sd, ocfs2_splice_write_actor);
+ if (ret > 0) {
+ *ppos += ret;
+
+ if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
+ err = generic_osync_inode(inode, mapping,
+ OSYNC_METADATA|OSYNC_DATA);
+ if (err)
+ ret = err;
+ }
+ }
+
return ret;
}
goto out;
}
- ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0);
+ ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
+ NULL);
if (ret < 0) {
mlog_errno(ret);
goto out_unlock;
}
/* ok, we're done with i_size and alloc work */
- ret = generic_file_splice_write_nolock(pipe, out, ppos, len, flags);
+ ret = __ocfs2_file_splice_write(pipe, out, ppos, len, flags);
out_unlock:
ocfs2_rw_unlock(inode, 1);
}
rw_level = 0;
/* communicate with ocfs2_dio_end_io */
- ocfs2_iocb_set_rw_locked(iocb);
+ ocfs2_iocb_set_rw_locked(iocb, rw_level);
}
/*
return ret;
}
-struct inode_operations ocfs2_file_iops = {
+const struct inode_operations ocfs2_file_iops = {
.setattr = ocfs2_setattr,
.getattr = ocfs2_getattr,
.permission = ocfs2_permission,
+ .fallocate = ocfs2_fallocate,
};
-struct inode_operations ocfs2_special_file_iops = {
+const struct inode_operations ocfs2_special_file_iops = {
.setattr = ocfs2_setattr,
.getattr = ocfs2_getattr,
.permission = ocfs2_permission,
const struct file_operations ocfs2_fops = {
.read = do_sync_read,
.write = do_sync_write,
- .sendfile = generic_file_sendfile,
.mmap = ocfs2_mmap,
.fsync = ocfs2_sync_file,
.release = ocfs2_file_release,
.aio_read = ocfs2_file_aio_read,
.aio_write = ocfs2_file_aio_write,
.ioctl = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ocfs2_compat_ioctl,
+#endif
.splice_read = ocfs2_file_splice_read,
.splice_write = ocfs2_file_splice_write,
};
.readdir = ocfs2_readdir,
.fsync = ocfs2_sync_file,
.ioctl = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ocfs2_compat_ioctl,
+#endif
};
projects / linux-2.6-omap-h63xx.git / blobdiff