The performed checks are similar to the checks performed by the Linux
kernel in the function fat_read_bpb() in the file fs/fat/inode.c.
Signed-off-by: Christian Taedcke <christian.taedcke@weidmueller.com>
This fixes an issue where the FAT type (FAT12, FAT16) is not
correctly detected, e.g. when the BPB field BS_FilSysType contains the
valid value "FAT ".
According to the FAT spec the field BS_FilSysType has only
informational character and does not determine the FAT type.
The logic of this code is based on the linux kernel implementation
from the file fs/fat/inode.c function fat_fill_super().
For details about FAT see http://elm-chan.org/docs/fat_e.html
Signed-off-by: Christian Taedcke <christian.taedcke@weidmueller.com>
This field is only present when a CONFIG is set. To avoid annoying #ifdefs
in the source code, add accessors. Update all code to use it.
Note that the accessor is optional. It can be omitted if it is known that
the option is enabled.
Signed-off-by: Simon Glass <sjg@chromium.org>
The product of two 32 bit integers is a 32 bit integer. Hence
clustcount * bytesperclust may overflow on > 4 GiB devices.
Change the type of clustcount.
Fixes: cb8af8af5b ("fs: fat: support write with non-zero offset")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
The FAT file systems uses character '\xe5' to mark a deleted directory
entry. If a file name starts with this character, it is substituted by
'\x05' in the directory entry.
While (signed char)'\xe5' is a negative number 0xe5 is a positive integer
number. We therefore have define a constant DELETED_MARK which matches the
signedness of the characters in the directory entry.
Correct a comparison where we used the constant 0xe5 with the wrong sign.
Use the constant aRING instead of 0x05 like in the rest of the code.
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: 57b745e238 ("fs: fat: call set_name() only once")
Fixes: 28cef9ca2e ("fs: fat: create correct short names")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
To save a few bytes, replace Error with ** and try to use the same string
for multiple messages where possible.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Do not mangle lower or mixed case filenames which fit into the upper
case 8.3 short filename. This ensures FAT standard compatible short
filenames (SFN) to support systems without long filename (LFN) support
like boot roms (ex. SFN BOOT.BIN instead of BOOT~1.BIN for LFN
boot.bin).
Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Sometimes it is useful to log things related to filesystems. Add a new
category and place it at the top of one of the FAT files.
Signed-off-by: Simon Glass <sjg@chromium.org>
UEFI applications call file system functions to determine if a file exists.
The return codes are evaluated to show appropriate messages.
U-Boot's file system layer should not interfere with the output.
Rename file_fat_read_at() to fat_read_file() adjusting the parameter
sequence and names and eliminate the old wrapper function.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
At present we use HAVE_BLOCK_DEVICE to indicate when block devices are
available.
This is a very strange option, since it partially duplicates the BLK
option used by driver model. It also covers both U-Boot proper and SPL,
even though one might have block devices and another not.
As a first step towards correcting this, create a new inline function
called blk_enabled() which indicates if block devices are available.
This cannot be used in Makefiles, or #if clauses, but can be used in C
code.
A function is useful because we cannot use CONFIG_IS_ENABLED(BLK) to
decide if block devices are needed, since we must consider the legacy
block interface, enabled by HAVE_BLOCK_DEVICE
Update a few places where it can be used and drop some unnecessary #if
checks around some functions in disk/part.c - rely on the compiler's
dead-code elimination instead.
Signed-off-by: Simon Glass <sjg@chromium.org>
This patch optimizes the commit mentioned below by avoiding running
a set of commands which are useless in the case when
size < mydata->sect_size and sect_count would be 0.
Fixes: 5b3ddb17ba ("fs/fat/fat.c: Do not perform zero block reads if there are no blocks left")
Signed-off-by: Ricardo Salveti <ricardo@foundries.io>
Co-developed-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
When reading a directory in the UEFI file system we have to return file
attributes and timestamps. Copy this data to the directory entry structure.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Up to now file_fat_detectfs() did not detect some interface types like
EFI, HOST, VIRTIO.
Avoid duplicate code by calling blk_get_if_type_name().
The interface type now will be shown in lower case to match all other use
cases.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
The FAT32 File System Specification [1] requires leading and trailing
spaces as well as trailing periods of long names to be ignored.
[1]
Microsoft Extensible Firmware Initiative
FAT32 File System Specification
Version 1.03, December 6, 2000
Microsoft Corporation
https://www.win.tue.nl/~aeb/linux/fs/fat/fatgen103.pdf
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Directories or files called '.' or '..' cannot be created or written to
in any directory. Move the test to normalize_longname() to check this
early.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This patch involves no functional change. It is just about code
readability.
Both in file_fat_write_at() and fat_mkdir() the incoming file or directory
path are split into two parts: the parent directory and the base name.
In file_fat_write_at() the value of the variable basename is assigned to
the filename parameter and afterwards the variable filename is used instead
of basename. It is more readable to use the variable basename and leave
filename unchanged.
In fat_mkdir() the base name variable is called directory. This is
confusing. Call it basename like in file_fat_write_at(). This allows to
rename parameter new_directory to directory in the implementation of
fat_mkdir() to match the function declaration.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
When copying short name plus extension refer to the encapsulating structure
and not to the short name element.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The short name and extension of FAT files are stored in adjacent fields of
the directory entry. For some operations like calculating a checksum or
copying both fields it is preferable to treat both as one structure.
Change the definition of the directory entry structure to include a
structure comprising the name and the extension field.
This resolves Coverity CID 316357, CID 316350, CID 316348.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Provide function description for flush_dir().
Move all error messages for flush_dir() from the callers to the function.
Move mapping of errors to -EIO to the function.
Always check return value of flush_dir() (Coverity CID 316362).
In fat_unlink() return -EIO if flush_dirty_fat_buffer() fails.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The FAT file system does not have a UUID but a 4 byte volume ID.
Let the fsuuid command show it in XXXX-XXXX format.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The FAT filesystem implementation uses several marcros referring to a magic
variable name mydata which renders the code less readable. Eliminate one of
them which is only used for a debug() statement.
Use log_debug() instead of debug().
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Long file names are stored in multiple directory entries. When deleting a
file we must delete all of them.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
A long name is split over multiple directory entries. When deleting a file
with a long name we need the first directory entry to be able to delete the
whole chain.
Add the necessary fields to the FAT iterator:
* cluster of first directory entry
* address of first directory entry
* remaining entries in cluster
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
When deleting a directory entry 0xe5 is written to name[0].
We have a constant for this value and should use it consistently.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Searching for a file is not a write operation. So it should not lead to the
allocation of a new cluster to the directory.
If we reuse deleted entries, we might not even use the new cluster and due
to not flushing it the directory could be corrupted.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
When creating new directory entries try to reuse entries marked as deleted.
In fill_dir_slot() do not allocate new clusters as this has already been
done in fat_find_empty_dentries().
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Provide a function to find a series of empty directory entries.
The current directory is scanned for deleted entries.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
When handling long file names directory entries may be split over multiple
clusters. We must make sure that new clusters are zero filled on disk.
When allocating a new cluster for a directory flush it.
The flushing should be executed before updating the FAT. This way if
flushing fails, we still have a valid directory structure.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
When iterating over a child directory we set itr->start_clust.
Do the same when over the root directory.
When looking for deleted directory entries or existing short names we will
have to iterate over directories a second and third time. With this patch
we do not need any special logic for the root directory.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
For reusing deleted directory entries we have to adjust the function called
to step to the next directory entry.
This patch alone is not enough to actually reuse deleted directory entries
as the fill_dir_slot() is still called with first never used directory
entry.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
File names must be unique within their directory. So before assigning a
short name we must check that it is unique.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
In set_name() we select the short name. Once this is correctly implemented
this will be a performance intensive operation because we need to check
that the name does not exist yet. So set_name should only be called once.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Currently we pass the short name via the directory iterator.
Pass it explicitly as a parameter.
This removes the requirement to set the short name in the iterator before
writing the long name.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The current function set_name() used to create short names has the
following deficiencies resolved by this patch:
* Long names (e.g. FOO.TXT) are stored even if a short name is enough.
* Short names with spaces are created, e.g. "A ~1.TXT".
* Short names with illegal characters are created, e.g. "FOO++BAR".
* Debug output does not not consider that the short file name has no
concluding '\0'.
The solution for the following bug is split of into a separate patch:
* Short file names must be unique.
This patch only provides the loop over possible short file names.
Fixes: c30a15e590 ("FAT: Add FAT write feature")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Rename function next_cluster() to fat_next_cluster() and export it.
When creating a new directory entries we should reuse deleted entries.
This requires re-scanning the directory.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The FAT specification [1] requires that for a '..' directory entry pointing
to the root directory the fields DIR_FstClusHi and DIR_FstClusLo are 0.
[1] Microsoft FAT Specification, Microsoft Corporation, August 30 2005
Fixes: 31a18d570d ("fs: fat: support mkdir")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Using constants instead of anonymous numbers increases code readability.
Fixes: 704df6aa0a ("fs: fat: refactor write interface for a file offset")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
0x05 is used as replacement letter for 0xe5 at the first position of short
file names. We must not skip over directory entries starting with 0x05.
Cf. Microsoft FAT Specification, August 30 2005
Fixes: 39606d462c ("fs: fat: handle deleted directory entries correctly")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
When trying to create a file in the full root directory of a FAT32
filesystem a NULL dereference can be observed.
When the root directory of a FAT16 filesystem is full fill_dir_slot() must
return -1 to signal that a new directory entry could not be allocated.
Fixes: cd2d727fff ("fs: fat: allocate a new cluster for root directory of fat32")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
While using u-boot with qemu's virtio driver I stumbled across a
problem reading files less than sector size. On the real hardware the
block reader seems ok with reading zero blocks, and while we could fix
the virtio host side of qemu to deal with a zero block read instead of
crashing, the u-boot fat driver should not be doing zero block reads
in the first place. If you ask hardware to read zero blocks you are
just going to get zero data. There may also be other hardware that
responds similarly to the virtio interface so this is worth fixing.
Without the patch I get the following and have to restart qemu because
it dies.
---------------------------------
=> fatls virtio 0:1
30 cmdline.txt
=> fatload virtio 0:1 ${loadaddr} cmdline.txt
qemu-system-aarch64: virtio: zero sized buffers are not allowed
---------------------------------
With the patch I get the expected results.
---------------------------------
=> fatls virtio 0:1
30 cmdline.txt
=> fatload virtio 0:1 ${loadaddr} cmdline.txt
30 bytes read in 11 ms (2 KiB/s)
=> md.b ${loadaddr} 0x1E
40080000: 64 77 63 5f 6f 74 67 2e 6c 70 6d 5f 65 6e 61 62 dwc_otg.lpm_enab
40080010: 6c 65 3d 30 20 72 6f 6f 74 77 61 69 74 0a le=0 rootwait.
---------------------------------
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Allocated tmpbuf_cluster dynamically to reduce the data size added by
compiling with CONFIG_FAT_WRITE.
Reported-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Truncate file names if the buffer size is exceeded to avoid a buffer
overflow.
Use Sphinx style function description.
Add a TODO comment.
Reported-by: CID 303779
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
According to the FAT specification it is valid to have files with an
attribute value of 0x0. This fixes a regression where different U-Boot
versions are showing different amount of files on the same storage
device. With this change U-Boot shows the same number of files and folders
as Linux and Windows.
Fixes: 39606d462c ("fs: fat: handle deleted directory entries correctly")
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
We should not be using typedefs and these make it harder to use
forward declarations (to reduce header file inclusions). Drop the typedef.
Signed-off-by: Simon Glass <sjg@chromium.org>
