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bcachefs: kill INODE_LOCK, use lock_two_nondirectories()

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In an ideal world, we'd have a common helper that could be used for
sorting a list of inodes into the correct lock order, and then the same
lock ordering could be used for any type of inode lock, not just
i_rwsem.

But the lock ordering rules for i_rwsem are a bit complicated, so -
abandon that dream for now and do it the more standard way.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-11-16 15:46:50 -05:00
parent 8b58623f5b
commit ecf8a74dab
2 changed files with 6 additions and 9 deletions
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6
fs/bcachefs/fs-io.c
View File

@ -861,7 +861,8 @@ loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
abs(pos_src - pos_dst) < len)
return -EINVAL;
bch2_lock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
lock_two_nondirectories(&src->v, &dst->v);
bch2_lock_inodes(INODE_PAGECACHE_BLOCK, src, dst);
inode_dio_wait(&src->v);
inode_dio_wait(&dst->v);
@ -914,7 +915,8 @@ loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
ret = bch2_flush_inode(c, dst);
err:
bch2_quota_reservation_put(c, dst, &quota_res);
bch2_unlock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
bch2_unlock_inodes(INODE_PAGECACHE_BLOCK, src, dst);
unlock_two_nondirectories(&src->v, &dst->v);
return bch2_err_class(ret);
}

9
fs/bcachefs/fs.h
View File

@ -77,9 +77,8 @@ static inline int ptrcmp(void *l, void *r)
}
enum bch_inode_lock_op {
INODE_LOCK = (1U << 0),
INODE_PAGECACHE_BLOCK = (1U << 1),
INODE_UPDATE_LOCK = (1U << 2),
INODE_PAGECACHE_BLOCK = (1U << 0),
INODE_UPDATE_LOCK = (1U << 1),
};
#define bch2_lock_inodes(_locks, ...) \
@ -91,8 +90,6 @@ do { \
\
for (i = 1; i < ARRAY_SIZE(a); i++) \
if (a[i] != a[i - 1]) { \
if ((_locks) & INODE_LOCK) \
down_write_nested(&a[i]->v.i_rwsem, i); \
if ((_locks) & INODE_PAGECACHE_BLOCK) \
bch2_pagecache_block_get(a[i]);\
if ((_locks) & INODE_UPDATE_LOCK) \
@ -109,8 +106,6 @@ do { \
\
for (i = 1; i < ARRAY_SIZE(a); i++) \
if (a[i] != a[i - 1]) { \
if ((_locks) & INODE_LOCK) \
up_write(&a[i]->v.i_rwsem); \
if ((_locks) & INODE_PAGECACHE_BLOCK) \
bch2_pagecache_block_put(a[i]);\
if ((_locks) & INODE_UPDATE_LOCK) \