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Btrfs: only map pages if we know we need them when reading the space cache
People have been running into a warning when loading space cache because the page is already mapped when trying to read in a bitmap. The way we read in entries and pages is kind of convoluted, so fix it so that io_ctl_read_entry maps the entries if it needs to, and if it hits the end of the page it simply unmaps the page. That way we can unconditionally unmap the io_ctl before reading in the bitmap and we should stop hitting these warnings. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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parent
76b9e23d25
commit
2f120c05e6
1 changed files with 10 additions and 7 deletions
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@ -537,6 +537,13 @@ static int io_ctl_read_entry(struct io_ctl *io_ctl,
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struct btrfs_free_space *entry, u8 *type)
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{
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struct btrfs_free_space_entry *e;
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int ret;
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if (!io_ctl->cur) {
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ret = io_ctl_check_crc(io_ctl, io_ctl->index);
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if (ret)
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return ret;
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}
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e = io_ctl->cur;
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entry->offset = le64_to_cpu(e->offset);
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@ -550,10 +557,7 @@ static int io_ctl_read_entry(struct io_ctl *io_ctl,
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io_ctl_unmap_page(io_ctl);
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if (io_ctl->index >= io_ctl->num_pages)
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return 0;
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return io_ctl_check_crc(io_ctl, io_ctl->index);
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return 0;
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}
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static int io_ctl_read_bitmap(struct io_ctl *io_ctl,
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@ -561,9 +565,6 @@ static int io_ctl_read_bitmap(struct io_ctl *io_ctl,
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{
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int ret;
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if (io_ctl->cur && io_ctl->cur != io_ctl->orig)
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io_ctl_unmap_page(io_ctl);
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ret = io_ctl_check_crc(io_ctl, io_ctl->index);
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if (ret)
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return ret;
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@ -699,6 +700,8 @@ int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
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num_entries--;
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}
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io_ctl_unmap_page(&io_ctl);
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/*
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* We add the bitmaps at the end of the entries in order that
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* the bitmap entries are added to the cache.
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