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Support O_TMPFILE and allow MOVE_BLOCKS into released extents

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Support O_TMPFILE: Create an unlinked file and put it on the orphan list.
If it ever gains a link, take it off the orphan list.

Change MOVE_BLOCKS ioctl to allow moving blocks into offline extent ranges.
Ioctl callers must set a new flag to enable this operation mode.

RH-compat: tmpfile support it actually backported by RH into 3.10 kernel.
We need to use some of their kabi-maintaining wrappers to use it:
use a struct inode_operations_wrapper instead of base struct
inode_operations, set S_IOPS_WRAPPER flag in i_flags. This lets
RH's modified vfs_tmpfile() find our tmpfile fn pointer.

Add a test that tests both creating tmpfiles as well as moving their
contents into a destination file via MOVE_BLOCKS.

xfstests common/004 now runs because tmpfile is supported.

Signed-off-by: Andy Grover <agrover@versity.com>
This commit is contained in:
Andy Grover
2021-04-05 14:23:44 -07:00
parent 09c879bcf1
commit 0deb232d3f
17 changed files with 349 additions and 43 deletions
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kmod/src/ext.h
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@@ -31,5 +31,6 @@ int scoutfs_ext_alloc(struct super_block *sb, struct scoutfs_ext_ops *ops,
struct scoutfs_extent *ext);
int scoutfs_ext_set(struct super_block *sb, struct scoutfs_ext_ops *ops,
void *arg, u64 start, u64 len, u64 map, u8 flags);
bool scoutfs_ext_inside(u64 start, u64 len, struct scoutfs_extent *out);
#endif