Commit graph

90 commits

Author SHA1 Message Date
Conrad Pankoff
062218b4cf Kernel: Support writing doubly-indirect ext2 blocks 2019-09-28 09:29:10 +02:00
Andreas Kling
e364846622 Ext2FS: Don't allocate blocks until we're committed to a new inode
Otherwise we would leak the blocks in case we returned earlier than
expected. :^)
2019-09-22 18:50:24 +02:00
Andreas Kling
bd7c38e7b6 Ext2FS: Oops, fix wrong ENOSPC in create_inode() 2019-09-22 18:44:05 +02:00
Andreas Kling
bff59eff4b Ext2FS: Fix two bugs in block allocation:
1) Off-by-one in block allocation when block size != 1 KB

Due to a quirk in the on-disk layout of ext2, file systems with a block
size of 1 KB have block #1 as their first block, while all others start
on block #0.

2) We had no fallback mechanism when the preferred group was full

We now allocate blocks from the preferred block group as long as it's
possible, and fall back to a simple scan through all groups when the
preferred one is full.
2019-09-22 18:37:17 +02:00
Andreas Kling
b9be6b7bb4 Ext2FS: Trying to create a too-long directory entry should ENAMETOOLONG
Also added some assertions to DirectoryEntry in case someone tries to
instantiate them with names that would overflow the name buffer.

DirectoryEntry is a crappy data structure, and the name buffer is also
crappy. Added a FIXME about replacing it with something nicer.

Before this patch, the DirectoryEntry::name buffer would overflow if
you did "touch extremely-long-file-name". Duh.

Fixes #538.
2019-09-10 21:04:27 +02:00
Andreas Kling
ac7a559d96 Ext2FS: Avoid a String allocation in lookup()
By using find() with a custom finder, we can avoid creating a temporary
key value that's only used for the hash lookup.
2019-08-25 06:45:37 +02:00
Andreas Kling
da7ae52eee Ext2FS: Clean up prepare_to_unmount() a little bit 2019-08-17 13:49:37 +02:00
Jesse Buhagiar
bc22456f89 Kernel: Added unmount ability to VFS
It is now possible to unmount file systems from the VFS via `umount`.
It works via looking up the `fsid` of the filesystem from the `Inode`'s
metatdata so I'm not sure how fragile it is. It seems to work for now
though as something to get us going.
2019-08-17 09:29:54 +02:00
Andreas Kling
4afafeae50 Ext2FS: Make some use of Vector::empend(). 2019-08-01 16:31:05 +02:00
Andreas Kling
ecb1b93d53 Ext2FS: Fix fetching of the major/minor device numbers for st_rdev.
This is how it seems to work:

- If ext2_inode.i_blocks[0] is non-zero, it contains the major/minor.
- Otherwise, it's in ext2_inode.i_blocks[1].
2019-07-31 17:24:54 +02:00
Andreas Kling
3b588b7dc0 Ext2FS: Put most debug logging behind EXT2_DEBUG.
The debug output was basically dominated by Ext2FS spam.
2019-07-21 18:38:14 +02:00
Andreas Kling
5254a320d8 Kernel: Remove use of copy_ref() in favor of regular RefPtr copies.
This is obviously more readable. If we ever run into a situation where
ref count churn is actually causing trouble in the future, we can deal with
it then. For now, let's keep it simple. :^)
2019-07-11 15:40:04 +02:00
Andreas Kling
0e75aba7c3 StringView: Rename characters() to characters_without_null_termination().
This should make you think twice before trying to use the const char* from
a StringView as if it's a null-terminated string.
2019-07-08 15:38:44 +02:00
Andreas Kling
27f699ef0c AK: Rename the common integer typedefs to make it obvious what they are.
These types can be picked up by including <AK/Types.h>:

* u8, u16, u32, u64 (unsigned)
* i8, i16, i32, i64 (signed)
2019-07-03 21:20:13 +02:00
Andreas Kling
90b1354688 AK: Rename RetainPtr => RefPtr and Retained => NonnullRefPtr. 2019-06-21 18:37:47 +02:00
Andreas Kling
77b9fa89dd AK: Rename Retainable => RefCounted.
(And various related renames that go along with it.)
2019-06-21 15:30:03 +02:00
Sergey Bugaev
75df45d709 Kernel: Fix comparing StringViews with strcmp().
StringView character buffer is not guaranteed to be null-terminated;
in particular it will not be null-terminated when making a substring.
This means that the buffer can not be used with C functions that expect
a null-terminated string. Instead, StringView provides a convinient
operator == for comparing it with Strings and C stirngs, so use that.

This fixes /proc/self/... resolution failures in ProcFS, since the name
("self") passed to ProcFSInode::lookup() would not be null-terminated.
2019-06-12 16:14:29 +02:00
Andreas Kling
51d70996ba Ext2FS: The block numbers returned by allocate_blocks() should be 1-based.
e2fsck complained about two inodes sharing the same block, and this was why.
2019-06-09 14:59:46 +02:00
Andreas Kling
7562c0b7bf Ext2FS: Fix wrong file mode being passed from create_inode() to add_child(). 2019-06-09 12:48:34 +02:00
Andreas Kling
6873e7d016 Ext2FS: Move directory writing logic into Ext2FSInode. 2019-06-09 12:46:23 +02:00
Andreas Kling
8258b699db Kernel: Use StringView more in Inode and subclasses. 2019-06-09 10:25:19 +02:00
Andreas Kling
891d4c4834 Kernel: Qualify a bunch of #include statements. 2019-06-07 19:29:34 +02:00
Andreas Kling
bc951ca565 Kernel: Run clang-format on everything. 2019-06-07 11:43:58 +02:00
Andreas Kling
08cd75ac4b Kernel: Rename FileDescriptor to FileDescription.
After reading a bunch of POSIX specs, I've learned that a file descriptor
is the number that refers to a file description, not the description itself.
So this patch renames FileDescriptor to FileDescription, and Process now has
FileDescription* file_description(int fd).
2019-06-07 09:36:51 +02:00
Andreas Kling
bba2c062fe FileSystem: Make Inode::lookup() take a StringView.
This avoids a lot of String allocation during path resolution.
2019-06-01 18:01:28 +02:00
Andreas Kling
2e14e5891c FileSystem: Remove now-unused Inode::parent() and Inode::reverse_lookup().
These were only used to implement the old path resolution algorithm.
2019-06-01 17:46:37 +02:00
Andreas Kling
9ac95d1867 FileSystem: Pass mode_t to Inode::add_child().
This way the Ext2FS code can update its directory entry "file type" fields
correctly based on the file mode. This fixes some e2fsck whining.
2019-05-31 17:41:33 +02:00
Andreas Kling
75b0e5cce5 Ext2FS: Block #0 can terminate an inode block list early.
We were already handling this for the indirect blocks, but the direct ones
would happily consider #0 to be a valid block list entry.
2019-05-25 19:19:43 +02:00
Andreas Kling
728327df8a Ext2FS: Fix build with EXT2_DEBUG enabled, and tweak some variable names. 2019-05-25 17:23:17 +02:00
Andreas Kling
8b249bd09b Kernel+Userland: Implement mknod() syscall and add a /bin/mknod program. 2019-05-03 22:59:58 +02:00
Andreas Kling
a6d407fec5 Ext2FS: Put some debug spam behind EXT2_DEBUG. 2019-04-28 22:14:37 +02:00
Andreas Kling
899f6a5de2 Ext2FS: Support shrinking inode to a smaller size.
Factor out inode resizing into a separate Ext2FSInode::resize() function.
This is then called both from write_bytes() and truncate().
This patch finally implements freeing of blocks when an inode shrinks.
2019-04-28 22:07:25 +02:00
Andreas Kling
dde8d90747 Ext2FS: Fix accidental zero-fill when appending to a file.
We were using the old file size, rather than the new file size, to determine
how much to zero-fill in the last block of a file.
2019-04-27 17:14:27 +02:00
Andreas Kling
e0cdc5db0d Ext2FS: Reduce debug spam in block allocation. 2019-04-25 22:05:32 +02:00
Andreas Kling
fd500c79d6 Ext2S: Fix off-by-one error in block allocation. 2019-04-23 16:38:45 +02:00
Andreas Kling
b041fc57de Ext2FS: Bitmaps aren't always at full capacity.
Block bitmaps only have (blocks_per_group) entries, while inode bitmaps
only have (inodes_per_group) entries.
2019-04-23 16:21:07 +02:00
Andreas Kling
14ceabeca8 Ext2FS: More bitmap misunderstanding cleanups.
Inode bitmaps are also only ever one block.
2019-04-23 15:07:07 +02:00
Andreas Kling
1bf37db9a9 Ext2FS: Simplify block bitmap stuff.
Block bitmaps are only ever one block in size. I don't know why I thought
otherwise, but use this info to simplify the code. :^)
2019-04-23 14:51:47 +02:00
Andreas Kling
58240fdb33 Do a pass of compiler warning fixes.
This is really making me question not using 64-bit integers more.
2019-04-23 13:00:53 +02:00
Andreas Kling
f9864940eb Kernel: Move FS-related files into Kernel/FileSystem/ 2019-04-03 12:25:24 +02:00
Renamed from Kernel/Ext2FileSystem.cpp (Browse further)