return rc;
}
+static inline int osd_extents_enabled(struct super_block *sb,
+ struct inode *inode)
+{
+ if (inode != NULL) {
+ if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
+ return 1;
+ } else if (test_opt(sb, EXTENTS)) {
+ return 1;
+ }
+ return 0;
+}
+
+static inline int osd_calc_bkmap_credits(struct super_block *sb,
+ struct inode *inode,
+ const loff_t size,
+ const loff_t pos,
+ const int blocks)
+{
+ int credits, bits, bs, i;
+
+ bits = sb->s_blocksize_bits;
+ bs = 1 << bits;
+
+ /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
+ * we do not expect blockmaps on the large files,
+ * so let's shrink it to 2 levels (4GB files) */
+
+ /* this is default reservation: 2 levels */
+ credits = (blocks + 2) * 3;
+
+ /* actual offset is unknown, hard to optimize */
+ if (pos == -1)
+ return credits;
+
+ /* now check for few specific cases to optimize */
+ if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
+ /* no indirects */
+ credits = blocks;
+ /* allocate if not allocated */
+ if (inode == NULL) {
+ credits += blocks * 2;
+ return credits;
+ }
+ for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
+ LASSERT(i < LDISKFS_NDIR_BLOCKS);
+ if (LDISKFS_I(inode)->i_data[i] == 0)
+ credits += 2;
+ }
+ } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
+ /* single indirect */
+ credits = blocks * 3;
+ /* probably indirect block has been allocated already */
+ if (!inode || LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK])
+ credits += 3;
+ }
+
+ return credits;
+}
+
static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
- const struct lu_buf *buf, loff_t pos,
+ const struct lu_buf *buf, loff_t _pos,
struct thandle *handle)
{
- struct osd_thandle *oh;
- int credits;
- struct inode *inode;
- int rc;
+ struct osd_object *obj = osd_dt_obj(dt);
+ struct inode *inode = obj->oo_inode;
+ struct super_block *sb = osd_sb(osd_obj2dev(obj));
+ struct osd_thandle *oh;
+ int rc = 0, est = 0, credits, blocks, allocated = 0;
+ int bits, bs;
+ int depth, size;
+ loff_t pos;
ENTRY;
+ LASSERT(buf != NULL);
LASSERT(handle != NULL);
oh = container_of0(handle, struct osd_thandle, ot_super);
LASSERT(oh->ot_handle == NULL);
- credits = osd_dto_credits_noquota[DTO_WRITE_BLOCK];
+ size = buf->lb_len;
+ bits = sb->s_blocksize_bits;
+ bs = 1 << bits;
- osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
+ if (_pos == -1) {
+ /* if this is an append, then we
+ * should expect cross-block record */
+ pos = 0;
+ } else {
+ pos = _pos;
+ }
- inode = osd_dt_obj(dt)->oo_inode;
+ /* blocks to modify */
+ blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
+ LASSERT(blocks > 0);
+
+ if (inode != NULL && _pos != -1) {
+ /* object size in blocks */
+ est = (i_size_read(inode) + bs - 1) >> bits;
+ allocated = inode->i_blocks >> (bits - 9);
+ if (pos + size <= i_size_read(inode) && est <= allocated) {
+ /* looks like an overwrite, no need to modify tree */
+ credits = blocks;
+ /* no need to modify i_size */
+ goto out;
+ }
+ }
+
+ if (osd_extents_enabled(sb, inode)) {
+ /*
+ * many concurrent threads may grow tree by the time
+ * our transaction starts. so, consider 2 is a min depth
+ * for every level we may need to allocate a new block
+ * and take some entries from the old one. so, 3 blocks
+ * to allocate (bitmap, gd, itself) + old block - 4 per
+ * level.
+ */
+ depth = inode != NULL ? ext_depth(inode) : 0;
+ depth = max(depth, 1) + 1;
+ credits = depth;
+ /* if not append, then split may need to modify
+ * existing blocks moving entries into the new ones */
+ if (_pos == -1)
+ credits += depth;
+ /* blocks to store data: bitmap,gd,itself */
+ credits += blocks * 3;
+ } else {
+ credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
+ }
+ /* if inode is created as part of the transaction,
+ * then it's counted already by the creation method */
+ if (inode != NULL)
+ credits++;
+
+out:
- /* we may declare write to non-exist llog */
- if (inode == NULL)
- RETURN(0);
+ osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
/* dt_declare_write() is usually called for system objects, such
* as llog or last_rcvd files. We needn't enforce quota on those
* objects, so always set the lqi_space as 0. */
- rc = osd_declare_inode_qid(env, inode->i_uid, inode->i_gid, 0, oh,
- true, true, NULL, false);
+ if (inode != NULL)
+ rc = osd_declare_inode_qid(env, inode->i_uid, inode->i_gid,
+ 0, oh, true, true, NULL, false);
RETURN(rc);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff