0a77fca3aa
We have namespaces, so use them for all vfs-exported namespaces so that filesystems can use them, but not anything else. Some in-kernel drivers that do direct filesystem accesses (because they serve up files) are also allowed access to these symbols to keep 'make allmodconfig' builds working properly, but it is not needed for Android kernel images. Bug: 157965270 Bug: 210074446 Cc: Matthias Maennich <maennich@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: Iaf6140baf3a18a516ab2d5c3966235c42f3f70de
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/fs.h>
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#include <linux/export.h>
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/*
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* fs on-disk file type to dirent file type conversion
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*/
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static const unsigned char fs_dtype_by_ftype[FT_MAX] = {
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[FT_UNKNOWN] = DT_UNKNOWN,
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[FT_REG_FILE] = DT_REG,
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[FT_DIR] = DT_DIR,
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[FT_CHRDEV] = DT_CHR,
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[FT_BLKDEV] = DT_BLK,
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[FT_FIFO] = DT_FIFO,
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[FT_SOCK] = DT_SOCK,
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[FT_SYMLINK] = DT_LNK
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};
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/**
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* fs_ftype_to_dtype() - fs on-disk file type to dirent type.
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* @filetype: The on-disk file type to convert.
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*
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* This function converts the on-disk file type value (FT_*) to the directory
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* entry type (DT_*).
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*
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* Context: Any context.
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* Return:
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* * DT_UNKNOWN - Unknown type
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* * DT_FIFO - FIFO
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* * DT_CHR - Character device
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* * DT_DIR - Directory
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* * DT_BLK - Block device
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* * DT_REG - Regular file
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* * DT_LNK - Symbolic link
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* * DT_SOCK - Local-domain socket
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*/
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unsigned char fs_ftype_to_dtype(unsigned int filetype)
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{
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if (filetype >= FT_MAX)
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return DT_UNKNOWN;
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return fs_dtype_by_ftype[filetype];
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}
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EXPORT_SYMBOL_NS_GPL(fs_ftype_to_dtype, ANDROID_GKI_VFS_EXPORT_ONLY);
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/*
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* dirent file type to fs on-disk file type conversion
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* Values not initialized explicitly are FT_UNKNOWN (0).
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*/
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static const unsigned char fs_ftype_by_dtype[DT_MAX] = {
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[DT_REG] = FT_REG_FILE,
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[DT_DIR] = FT_DIR,
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[DT_LNK] = FT_SYMLINK,
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[DT_CHR] = FT_CHRDEV,
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[DT_BLK] = FT_BLKDEV,
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[DT_FIFO] = FT_FIFO,
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[DT_SOCK] = FT_SOCK,
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};
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/**
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* fs_umode_to_ftype() - file mode to on-disk file type.
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* @mode: The file mode to convert.
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*
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* This function converts the file mode value to the on-disk file type (FT_*).
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*
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* Context: Any context.
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* Return:
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* * FT_UNKNOWN - Unknown type
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* * FT_REG_FILE - Regular file
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* * FT_DIR - Directory
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* * FT_CHRDEV - Character device
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* * FT_BLKDEV - Block device
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* * FT_FIFO - FIFO
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* * FT_SOCK - Local-domain socket
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* * FT_SYMLINK - Symbolic link
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*/
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unsigned char fs_umode_to_ftype(umode_t mode)
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{
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return fs_ftype_by_dtype[S_DT(mode)];
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}
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EXPORT_SYMBOL_GPL(fs_umode_to_ftype);
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/**
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* fs_umode_to_dtype() - file mode to dirent file type.
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* @mode: The file mode to convert.
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*
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* This function converts the file mode value to the directory
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* entry type (DT_*).
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*
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* Context: Any context.
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* Return:
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* * DT_UNKNOWN - Unknown type
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* * DT_FIFO - FIFO
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* * DT_CHR - Character device
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* * DT_DIR - Directory
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* * DT_BLK - Block device
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* * DT_REG - Regular file
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* * DT_LNK - Symbolic link
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* * DT_SOCK - Local-domain socket
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*/
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unsigned char fs_umode_to_dtype(umode_t mode)
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{
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return fs_ftype_to_dtype(fs_umode_to_ftype(mode));
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}
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EXPORT_SYMBOL_GPL(fs_umode_to_dtype);
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