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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /fs/ext4/mballoc.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/ext4/mballoc.h')
-rw-r--r--fs/ext4/mballoc.h251
1 files changed, 251 insertions, 0 deletions
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
new file mode 100644
index 000000000..00b3898df
--- /dev/null
+++ b/fs/ext4/mballoc.h
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fs/ext4/mballoc.h
+ *
+ * Written by: Alex Tomas <alex@clusterfs.com>
+ *
+ */
+#ifndef _EXT4_MBALLOC_H
+#define _EXT4_MBALLOC_H
+
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/quotaops.h>
+#include <linux/buffer_head.h>
+#include <linux/module.h>
+#include <linux/swap.h>
+#include <linux/proc_fs.h>
+#include <linux/pagemap.h>
+#include <linux/seq_file.h>
+#include <linux/blkdev.h>
+#include <linux/mutex.h>
+#include "ext4_jbd2.h"
+#include "ext4.h"
+
+/*
+ * mb_debug() dynamic printk msgs could be used to debug mballoc code.
+ */
+#ifdef CONFIG_EXT4_DEBUG
+#define mb_debug(sb, fmt, ...) \
+ pr_debug("[%s/%d] EXT4-fs (%s): (%s, %d): %s: " fmt, \
+ current->comm, task_pid_nr(current), sb->s_id, \
+ __FILE__, __LINE__, __func__, ##__VA_ARGS__)
+#else
+#define mb_debug(sb, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
+#endif
+
+#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */
+#define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */
+
+/*
+ * How long mballoc can look for a best extent (in found extents)
+ */
+#define MB_DEFAULT_MAX_TO_SCAN 200
+
+/*
+ * How long mballoc must look for a best extent
+ */
+#define MB_DEFAULT_MIN_TO_SCAN 10
+
+/*
+ * with 'ext4_mb_stats' allocator will collect stats that will be
+ * shown at umount. The collecting costs though!
+ */
+#define MB_DEFAULT_STATS 0
+
+/*
+ * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served
+ * by the stream allocator, which purpose is to pack requests
+ * as close each to other as possible to produce smooth I/O traffic
+ * We use locality group prealloc space for stream request.
+ * We can tune the same via /proc/fs/ext4/<partition>/stream_req
+ */
+#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */
+
+/*
+ * for which requests use 2^N search using buddies
+ */
+#define MB_DEFAULT_ORDER2_REQS 2
+
+/*
+ * default group prealloc size 512 blocks
+ */
+#define MB_DEFAULT_GROUP_PREALLOC 512
+
+/*
+ * maximum length of inode prealloc list
+ */
+#define MB_DEFAULT_MAX_INODE_PREALLOC 512
+
+/*
+ * Number of groups to search linearly before performing group scanning
+ * optimization.
+ */
+#define MB_DEFAULT_LINEAR_LIMIT 4
+
+/*
+ * Minimum number of groups that should be present in the file system to perform
+ * group scanning optimizations.
+ */
+#define MB_DEFAULT_LINEAR_SCAN_THRESHOLD 16
+
+/*
+ * Number of valid buddy orders
+ */
+#define MB_NUM_ORDERS(sb) ((sb)->s_blocksize_bits + 2)
+
+struct ext4_free_data {
+ /* this links the free block information from sb_info */
+ struct list_head efd_list;
+
+ /* this links the free block information from group_info */
+ struct rb_node efd_node;
+
+ /* group which free block extent belongs */
+ ext4_group_t efd_group;
+
+ /* free block extent */
+ ext4_grpblk_t efd_start_cluster;
+ ext4_grpblk_t efd_count;
+
+ /* transaction which freed this extent */
+ tid_t efd_tid;
+};
+
+struct ext4_prealloc_space {
+ struct list_head pa_inode_list;
+ struct list_head pa_group_list;
+ union {
+ struct list_head pa_tmp_list;
+ struct rcu_head pa_rcu;
+ } u;
+ spinlock_t pa_lock;
+ atomic_t pa_count;
+ unsigned pa_deleted;
+ ext4_fsblk_t pa_pstart; /* phys. block */
+ ext4_lblk_t pa_lstart; /* log. block */
+ ext4_grpblk_t pa_len; /* len of preallocated chunk */
+ ext4_grpblk_t pa_free; /* how many blocks are free */
+ unsigned short pa_type; /* pa type. inode or group */
+ spinlock_t *pa_obj_lock;
+ struct inode *pa_inode; /* hack, for history only */
+};
+
+enum {
+ MB_INODE_PA = 0,
+ MB_GROUP_PA = 1
+};
+
+struct ext4_free_extent {
+ ext4_lblk_t fe_logical;
+ ext4_grpblk_t fe_start; /* In cluster units */
+ ext4_group_t fe_group;
+ ext4_grpblk_t fe_len; /* In cluster units */
+};
+
+/*
+ * Locality group:
+ * we try to group all related changes together
+ * so that writeback can flush/allocate them together as well
+ * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC
+ * (512). We store prealloc space into the hash based on the pa_free blocks
+ * order value.ie, fls(pa_free)-1;
+ */
+#define PREALLOC_TB_SIZE 10
+struct ext4_locality_group {
+ /* for allocator */
+ /* to serialize allocates */
+ struct mutex lg_mutex;
+ /* list of preallocations */
+ struct list_head lg_prealloc_list[PREALLOC_TB_SIZE];
+ spinlock_t lg_prealloc_lock;
+};
+
+struct ext4_allocation_context {
+ struct inode *ac_inode;
+ struct super_block *ac_sb;
+
+ /* original request */
+ struct ext4_free_extent ac_o_ex;
+
+ /* goal request (normalized ac_o_ex) */
+ struct ext4_free_extent ac_g_ex;
+
+ /* the best found extent */
+ struct ext4_free_extent ac_b_ex;
+
+ /* copy of the best found extent taken before preallocation efforts */
+ struct ext4_free_extent ac_f_ex;
+
+ __u32 ac_groups_considered;
+ __u32 ac_flags; /* allocation hints */
+ __u16 ac_groups_scanned;
+ __u16 ac_groups_linear_remaining;
+ __u16 ac_found;
+ __u16 ac_tail;
+ __u16 ac_buddy;
+ __u8 ac_status;
+ __u8 ac_criteria;
+ __u8 ac_2order; /* if request is to allocate 2^N blocks and
+ * N > 0, the field stores N, otherwise 0 */
+ __u8 ac_op; /* operation, for history only */
+ struct page *ac_bitmap_page;
+ struct page *ac_buddy_page;
+ struct ext4_prealloc_space *ac_pa;
+ struct ext4_locality_group *ac_lg;
+};
+
+#define AC_STATUS_CONTINUE 1
+#define AC_STATUS_FOUND 2
+#define AC_STATUS_BREAK 3
+
+struct ext4_buddy {
+ struct page *bd_buddy_page;
+ void *bd_buddy;
+ struct page *bd_bitmap_page;
+ void *bd_bitmap;
+ struct ext4_group_info *bd_info;
+ struct super_block *bd_sb;
+ __u16 bd_blkbits;
+ ext4_group_t bd_group;
+};
+
+static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
+ struct ext4_free_extent *fex)
+{
+ return ext4_group_first_block_no(sb, fex->fe_group) +
+ (fex->fe_start << EXT4_SB(sb)->s_cluster_bits);
+}
+
+static inline loff_t extent_logical_end(struct ext4_sb_info *sbi,
+ struct ext4_free_extent *fex)
+{
+ /* Use loff_t to avoid end exceeding ext4_lblk_t max. */
+ return (loff_t)fex->fe_logical + EXT4_C2B(sbi, fex->fe_len);
+}
+
+static inline loff_t pa_logical_end(struct ext4_sb_info *sbi,
+ struct ext4_prealloc_space *pa)
+{
+ /* Use loff_t to avoid end exceeding ext4_lblk_t max. */
+ return (loff_t)pa->pa_lstart + EXT4_C2B(sbi, pa->pa_len);
+}
+
+typedef int (*ext4_mballoc_query_range_fn)(
+ struct super_block *sb,
+ ext4_group_t agno,
+ ext4_grpblk_t start,
+ ext4_grpblk_t len,
+ void *priv);
+
+int
+ext4_mballoc_query_range(
+ struct super_block *sb,
+ ext4_group_t agno,
+ ext4_grpblk_t start,
+ ext4_grpblk_t end,
+ ext4_mballoc_query_range_fn formatter,
+ void *priv);
+
+#endif