diff options
author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2015-02-16 23:59:38 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-17 01:56:04 (GMT) |
commit | 923ae0ff9250430133b3310fe62c47538cf1cbc1 (patch) | |
tree | 3c4194cbedbe77e719bf7c8762fba5362ec26032 | |
parent | 25726bc15731d42112b579cf73f30edbc43d3973 (diff) | |
download | linux-923ae0ff9250430133b3310fe62c47538cf1cbc1.tar.xz |
ext4: add DAX functionality
This is a port of the DAX functionality found in the current version of
ext2.
[matthew.r.wilcox@intel.com: heavily tweaked]
[akpm@linux-foundation.org: remap_pages went away]
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | Documentation/filesystems/dax.txt | 1 | ||||
-rw-r--r-- | Documentation/filesystems/ext4.txt | 4 | ||||
-rw-r--r-- | fs/ext4/ext4.h | 6 | ||||
-rw-r--r-- | fs/ext4/file.c | 49 | ||||
-rw-r--r-- | fs/ext4/indirect.c | 18 | ||||
-rw-r--r-- | fs/ext4/inode.c | 89 | ||||
-rw-r--r-- | fs/ext4/namei.c | 10 | ||||
-rw-r--r-- | fs/ext4/super.c | 39 |
8 files changed, 179 insertions, 37 deletions
diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index ebcd97f..be376d9 100644 --- a/Documentation/filesystems/dax.txt +++ b/Documentation/filesystems/dax.txt @@ -73,6 +73,7 @@ or a write()) work correctly. These filesystems may be used for inspiration: - ext2: the second extended filesystem, see Documentation/filesystems/ext2.txt +- ext4: the fourth extended filesystem, see Documentation/filesystems/ext4.txt Shortcomings diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt index 919a329..6c0108e 100644 --- a/Documentation/filesystems/ext4.txt +++ b/Documentation/filesystems/ext4.txt @@ -386,6 +386,10 @@ max_dir_size_kb=n This limits the size of directories so that any i_version Enable 64-bit inode version support. This option is off by default. +dax Use direct access (no page cache). See + Documentation/filesystems/dax.txt. Note that + this option is incompatible with data=journal. + Data Mode ========= There are 3 different data modes: diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index a75fba6..982d934 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -965,6 +965,11 @@ struct ext4_inode_info { #define EXT4_MOUNT_ERRORS_MASK 0x00070 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ +#ifdef CONFIG_FS_DAX +#define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ +#else +#define EXT4_MOUNT_DAX 0 +#endif #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ @@ -2578,6 +2583,7 @@ extern const struct file_operations ext4_dir_operations; /* file.c */ extern const struct inode_operations ext4_file_inode_operations; extern const struct file_operations ext4_file_operations; +extern const struct file_operations ext4_dax_file_operations; extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); /* inline.c */ diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 7cb5923..33a09da 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -95,7 +95,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from) struct inode *inode = file_inode(iocb->ki_filp); struct mutex *aio_mutex = NULL; struct blk_plug plug; - int o_direct = file->f_flags & O_DIRECT; + int o_direct = io_is_direct(file); int overwrite = 0; size_t length = iov_iter_count(from); ssize_t ret; @@ -191,6 +191,26 @@ errout: return ret; } +#ifdef CONFIG_FS_DAX +static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + return dax_fault(vma, vmf, ext4_get_block); + /* Is this the right get_block? */ +} + +static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + return dax_mkwrite(vma, vmf, ext4_get_block); +} + +static const struct vm_operations_struct ext4_dax_vm_ops = { + .fault = ext4_dax_fault, + .page_mkwrite = ext4_dax_mkwrite, +}; +#else +#define ext4_dax_vm_ops ext4_file_vm_ops +#endif + static const struct vm_operations_struct ext4_file_vm_ops = { .fault = filemap_fault, .map_pages = filemap_map_pages, @@ -200,7 +220,12 @@ static const struct vm_operations_struct ext4_file_vm_ops = { static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) { file_accessed(file); - vma->vm_ops = &ext4_file_vm_ops; + if (IS_DAX(file_inode(file))) { + vma->vm_ops = &ext4_dax_vm_ops; + vma->vm_flags |= VM_MIXEDMAP; + } else { + vma->vm_ops = &ext4_file_vm_ops; + } return 0; } @@ -599,6 +624,26 @@ const struct file_operations ext4_file_operations = { .fallocate = ext4_fallocate, }; +#ifdef CONFIG_FS_DAX +const struct file_operations ext4_dax_file_operations = { + .llseek = ext4_llseek, + .read = new_sync_read, + .write = new_sync_write, + .read_iter = generic_file_read_iter, + .write_iter = ext4_file_write_iter, + .unlocked_ioctl = ext4_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = ext4_compat_ioctl, +#endif + .mmap = ext4_file_mmap, + .open = ext4_file_open, + .release = ext4_release_file, + .fsync = ext4_sync_file, + /* Splice not yet supported with DAX */ + .fallocate = ext4_fallocate, +}; +#endif + const struct inode_operations ext4_file_inode_operations = { .setattr = ext4_setattr, .getattr = ext4_getattr, diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c index 36b3696..6b9878a 100644 --- a/fs/ext4/indirect.c +++ b/fs/ext4/indirect.c @@ -689,14 +689,22 @@ retry: inode_dio_done(inode); goto locked; } - ret = __blockdev_direct_IO(rw, iocb, inode, - inode->i_sb->s_bdev, iter, offset, - ext4_get_block, NULL, NULL, 0); + if (IS_DAX(inode)) + ret = dax_do_io(rw, iocb, inode, iter, offset, + ext4_get_block, NULL, 0); + else + ret = __blockdev_direct_IO(rw, iocb, inode, + inode->i_sb->s_bdev, iter, offset, + ext4_get_block, NULL, NULL, 0); inode_dio_done(inode); } else { locked: - ret = blockdev_direct_IO(rw, iocb, inode, iter, - offset, ext4_get_block); + if (IS_DAX(inode)) + ret = dax_do_io(rw, iocb, inode, iter, offset, + ext4_get_block, NULL, DIO_LOCKING); + else + ret = blockdev_direct_IO(rw, iocb, inode, iter, + offset, ext4_get_block); if (unlikely((rw & WRITE) && ret < 0)) { loff_t isize = i_size_read(inode); diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 5653fa4..28555f1 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -657,6 +657,18 @@ has_zeroout: return retval; } +static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate) +{ + struct inode *inode = bh->b_assoc_map->host; + /* XXX: breaks on 32-bit > 16GB. Is that even supported? */ + loff_t offset = (loff_t)(uintptr_t)bh->b_private << inode->i_blkbits; + int err; + if (!uptodate) + return; + WARN_ON(!buffer_unwritten(bh)); + err = ext4_convert_unwritten_extents(NULL, inode, offset, bh->b_size); +} + /* Maximum number of blocks we map for direct IO at once. */ #define DIO_MAX_BLOCKS 4096 @@ -694,6 +706,11 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock, map_bh(bh, inode->i_sb, map.m_pblk); bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; + if (IS_DAX(inode) && buffer_unwritten(bh) && !io_end) { + bh->b_assoc_map = inode->i_mapping; + bh->b_private = (void *)(unsigned long)iblock; + bh->b_end_io = ext4_end_io_unwritten; + } if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN) set_buffer_defer_completion(bh); bh->b_size = inode->i_sb->s_blocksize * map.m_len; @@ -3010,13 +3027,14 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb, get_block_func = ext4_get_block_write; dio_flags = DIO_LOCKING; } - ret = __blockdev_direct_IO(rw, iocb, inode, - inode->i_sb->s_bdev, iter, - offset, - get_block_func, - ext4_end_io_dio, - NULL, - dio_flags); + if (IS_DAX(inode)) + ret = dax_do_io(rw, iocb, inode, iter, offset, get_block_func, + ext4_end_io_dio, dio_flags); + else + ret = __blockdev_direct_IO(rw, iocb, inode, + inode->i_sb->s_bdev, iter, offset, + get_block_func, + ext4_end_io_dio, NULL, dio_flags); /* * Put our reference to io_end. This can free the io_end structure e.g. @@ -3180,19 +3198,12 @@ void ext4_set_aops(struct inode *inode) inode->i_mapping->a_ops = &ext4_aops; } -/* - * ext4_block_zero_page_range() zeros out a mapping of length 'length' - * starting from file offset 'from'. The range to be zero'd must - * be contained with in one block. If the specified range exceeds - * the end of the block it will be shortened to end of the block - * that cooresponds to 'from' - */ -static int ext4_block_zero_page_range(handle_t *handle, +static int __ext4_block_zero_page_range(handle_t *handle, struct address_space *mapping, loff_t from, loff_t length) { ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT; unsigned offset = from & (PAGE_CACHE_SIZE-1); - unsigned blocksize, max, pos; + unsigned blocksize, pos; ext4_lblk_t iblock; struct inode *inode = mapping->host; struct buffer_head *bh; @@ -3205,14 +3216,6 @@ static int ext4_block_zero_page_range(handle_t *handle, return -ENOMEM; blocksize = inode->i_sb->s_blocksize; - max = blocksize - (offset & (blocksize - 1)); - - /* - * correct length if it does not fall between - * 'from' and the end of the block - */ - if (length > max || length < 0) - length = max; iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); @@ -3278,6 +3281,33 @@ unlock: } /* + * ext4_block_zero_page_range() zeros out a mapping of length 'length' + * starting from file offset 'from'. The range to be zero'd must + * be contained with in one block. If the specified range exceeds + * the end of the block it will be shortened to end of the block + * that cooresponds to 'from' + */ +static int ext4_block_zero_page_range(handle_t *handle, + struct address_space *mapping, loff_t from, loff_t length) +{ + struct inode *inode = mapping->host; + unsigned offset = from & (PAGE_CACHE_SIZE-1); + unsigned blocksize = inode->i_sb->s_blocksize; + unsigned max = blocksize - (offset & (blocksize - 1)); + + /* + * correct length if it does not fall between + * 'from' and the end of the block + */ + if (length > max || length < 0) + length = max; + + if (IS_DAX(inode)) + return dax_zero_page_range(inode, from, length, ext4_get_block); + return __ext4_block_zero_page_range(handle, mapping, from, length); +} + +/* * ext4_block_truncate_page() zeroes out a mapping from file offset `from' * up to the end of the block which corresponds to `from'. * This required during truncate. We need to physically zero the tail end @@ -3798,8 +3828,10 @@ void ext4_set_inode_flags(struct inode *inode) new_fl |= S_NOATIME; if (flags & EXT4_DIRSYNC_FL) new_fl |= S_DIRSYNC; + if (test_opt(inode->i_sb, DAX)) + new_fl |= S_DAX; inode_set_flags(inode, new_fl, - S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); + S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX); } /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */ @@ -4052,7 +4084,10 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) if (S_ISREG(inode->i_mode)) { inode->i_op = &ext4_file_inode_operations; - inode->i_fop = &ext4_file_operations; + if (test_opt(inode->i_sb, DAX)) + inode->i_fop = &ext4_dax_file_operations; + else + inode->i_fop = &ext4_file_operations; ext4_set_aops(inode); } else if (S_ISDIR(inode->i_mode)) { inode->i_op = &ext4_dir_inode_operations; @@ -4534,7 +4569,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) * Truncate pagecache after we've waited for commit * in data=journal mode to make pages freeable. */ - truncate_pagecache(inode, inode->i_size); + truncate_pagecache(inode, inode->i_size); } /* * We want to call ext4_truncate() even if attr->ia_size == diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 2291923..28fe71a 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -2235,7 +2235,10 @@ retry: err = PTR_ERR(inode); if (!IS_ERR(inode)) { inode->i_op = &ext4_file_inode_operations; - inode->i_fop = &ext4_file_operations; + if (test_opt(inode->i_sb, DAX)) + inode->i_fop = &ext4_dax_file_operations; + else + inode->i_fop = &ext4_file_operations; ext4_set_aops(inode); err = ext4_add_nondir(handle, dentry, inode); if (!err && IS_DIRSYNC(dir)) @@ -2299,7 +2302,10 @@ retry: err = PTR_ERR(inode); if (!IS_ERR(inode)) { inode->i_op = &ext4_file_inode_operations; - inode->i_fop = &ext4_file_operations; + if (test_opt(inode->i_sb, DAX)) + inode->i_fop = &ext4_dax_file_operations; + else + inode->i_fop = &ext4_file_operations; ext4_set_aops(inode); d_tmpfile(dentry, inode); err = ext4_orphan_add(handle, inode); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 64c39c7..10e8c6b 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1124,7 +1124,7 @@ enum { Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, - Opt_usrquota, Opt_grpquota, Opt_i_version, + Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax, Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, Opt_inode_readahead_blks, Opt_journal_ioprio, @@ -1187,6 +1187,7 @@ static const match_table_t tokens = { {Opt_barrier, "barrier"}, {Opt_nobarrier, "nobarrier"}, {Opt_i_version, "i_version"}, + {Opt_dax, "dax"}, {Opt_stripe, "stripe=%u"}, {Opt_delalloc, "delalloc"}, {Opt_nodelalloc, "nodelalloc"}, @@ -1371,6 +1372,7 @@ static const struct mount_opts { {Opt_min_batch_time, 0, MOPT_GTE0}, {Opt_inode_readahead_blks, 0, MOPT_GTE0}, {Opt_init_itable, 0, MOPT_GTE0}, + {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET}, {Opt_stripe, 0, MOPT_GTE0}, {Opt_resuid, 0, MOPT_GTE0}, {Opt_resgid, 0, MOPT_GTE0}, @@ -1607,6 +1609,11 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, } sbi->s_jquota_fmt = m->mount_opt; #endif +#ifndef CONFIG_FS_DAX + } else if (token == Opt_dax) { + ext4_msg(sb, KERN_INFO, "dax option not supported"); + return -1; +#endif } else { if (!args->from) arg = 1; @@ -3589,6 +3596,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) "both data=journal and dioread_nolock"); goto failed_mount; } + if (test_opt(sb, DAX)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dax"); + goto failed_mount; + } if (test_opt(sb, DELALLOC)) clear_opt(sb, DELALLOC); } @@ -3652,6 +3664,19 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) goto failed_mount; } + if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { + if (blocksize != PAGE_SIZE) { + ext4_msg(sb, KERN_ERR, + "error: unsupported blocksize for dax"); + goto failed_mount; + } + if (!sb->s_bdev->bd_disk->fops->direct_access) { + ext4_msg(sb, KERN_ERR, + "error: device does not support dax"); + goto failed_mount; + } + } + if (sb->s_blocksize != blocksize) { /* Validate the filesystem blocksize */ if (!sb_set_blocksize(sb, blocksize)) { @@ -4869,6 +4894,18 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) err = -EINVAL; goto restore_opts; } + if (test_opt(sb, DAX)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dax"); + err = -EINVAL; + goto restore_opts; + } + } + + if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) { + ext4_msg(sb, KERN_WARNING, "warning: refusing change of " + "dax flag with busy inodes while remounting"); + sbi->s_mount_opt ^= EXT4_MOUNT_DAX; } if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) |