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ext4: Add mount option to set kjournald's I/O priority
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Theodore Ts'o
parent
40a1984d22
commit
b3881f74b3
4 changed files with 36 additions and 5 deletions
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@ -308,6 +308,13 @@ min_batch_time=usec This parameter sets the commit time (as
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multi-threaded, synchronous workloads on very
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fast disks, at the cost of increasing latency.
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journal_ioprio=prio The I/O priority (from 0 to 7, where 0 is the
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highest priorty) which should be used for I/O
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operations submitted by kjournald2 during a
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commit operation. This defaults to 3, which is
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a slightly higher priority than the default I/O
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priority.
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Data Mode
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=========
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There are 3 different data modes:
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@ -1013,7 +1013,7 @@ enum {
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Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
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Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
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Opt_stripe, Opt_delalloc, Opt_nodelalloc,
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Opt_inode_readahead_blks
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Opt_inode_readahead_blks, Opt_journal_ioprio
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};
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static const match_table_t tokens = {
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@ -1074,6 +1074,7 @@ static const match_table_t tokens = {
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{Opt_delalloc, "delalloc"},
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{Opt_nodelalloc, "nodelalloc"},
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{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
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{Opt_journal_ioprio, "journal_ioprio=%u"},
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{Opt_err, NULL},
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};
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@ -1098,8 +1099,11 @@ static ext4_fsblk_t get_sb_block(void **data)
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return sb_block;
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}
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#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
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static int parse_options(char *options, struct super_block *sb,
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unsigned long *journal_devnum,
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unsigned int *journal_ioprio,
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ext4_fsblk_t *n_blocks_count, int is_remount)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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@ -1492,6 +1496,14 @@ set_qf_format:
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return 0;
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sbi->s_inode_readahead_blks = option;
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break;
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case Opt_journal_ioprio:
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if (match_int(&args[0], &option))
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return 0;
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if (option < 0 || option > 7)
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break;
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*journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
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option);
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break;
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default:
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printk(KERN_ERR
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"EXT4-fs: Unrecognized mount option \"%s\" "
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@ -2035,6 +2047,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
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int features;
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__u64 blocks_count;
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int err;
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unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi)
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@ -2141,7 +2154,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
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set_opt(sbi->s_mount_opt, DELALLOC);
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if (!parse_options((char *) data, sb, &journal_devnum, NULL, 0))
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if (!parse_options((char *) data, sb, &journal_devnum,
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&journal_ioprio, NULL, 0))
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goto failed_mount;
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sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
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@ -2506,6 +2520,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
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default:
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break;
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}
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set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
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no_journal:
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@ -3127,6 +3142,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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unsigned long old_sb_flags;
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struct ext4_mount_options old_opts;
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ext4_group_t g;
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unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
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int err;
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#ifdef CONFIG_QUOTA
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int i;
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@ -3145,11 +3161,14 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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for (i = 0; i < MAXQUOTAS; i++)
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old_opts.s_qf_names[i] = sbi->s_qf_names[i];
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#endif
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if (sbi->s_journal && sbi->s_journal->j_task->io_context)
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journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
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/*
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* Allow the "check" option to be passed as a remount option.
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*/
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if (!parse_options(data, sb, NULL, &n_blocks_count, 1)) {
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if (!parse_options(data, sb, NULL, &journal_ioprio,
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&n_blocks_count, 1)) {
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err = -EINVAL;
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goto restore_opts;
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}
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@ -3162,8 +3181,10 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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es = sbi->s_es;
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if (sbi->s_journal)
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if (sbi->s_journal) {
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ext4_init_journal_params(sb, sbi->s_journal);
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set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
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}
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if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
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n_blocks_count > ext4_blocks_count(es)) {
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@ -27,7 +27,7 @@
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#include <linux/security.h>
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#include <linux/pid_namespace.h>
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static int set_task_ioprio(struct task_struct *task, int ioprio)
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int set_task_ioprio(struct task_struct *task, int ioprio)
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{
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int err;
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struct io_context *ioc;
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@ -70,6 +70,7 @@ static int set_task_ioprio(struct task_struct *task, int ioprio)
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task_unlock(task);
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return err;
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}
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EXPORT_SYMBOL_GPL(set_task_ioprio);
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asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
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{
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@ -86,4 +86,6 @@ static inline int task_nice_ioclass(struct task_struct *task)
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*/
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extern int ioprio_best(unsigned short aprio, unsigned short bprio);
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extern int set_task_ioprio(struct task_struct *task, int ioprio);
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#endif
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