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https://github.com/edk2-porting/linux-next.git
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c3367a1b47
Windows presents files created within Linux as read-only, even when permissions in Linux indicate the file should be writable. UDF defines a slightly different set of basic file permissions than Linux. Specifically, UDF has "delete" and "change attribute" permissions for each access class (user/group/other). Linux has no equivalents for these. When the Linux UDF driver creates a file (or directory), no UDF delete or change attribute permissions are granted. The lack of delete permission appears to cause Windows to mark an item read-only when its permissions otherwise indicate that it should be read-write. Fix this by having UDF delete permissions track Linux write permissions. Also grant UDF change attribute permission to the owner when creating a new inode. Reported by: Ty Young Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Link: https://lore.kernel.org/r/20190827121359.9954-1-steve@digidescorp.com Signed-off-by: Jan Kara <jack@suse.cz>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _UDF_I_H
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#define _UDF_I_H
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struct extent_position {
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struct buffer_head *bh;
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uint32_t offset;
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struct kernel_lb_addr block;
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};
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struct udf_ext_cache {
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/* Extent position */
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struct extent_position epos;
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/* Start logical offset in bytes */
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loff_t lstart;
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};
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/*
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* The i_data_sem and i_mutex serve for protection of allocation information
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* of a regular files and symlinks. This includes all extents belonging to
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* the file/symlink, a fact whether data are in-inode or in external data
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* blocks, preallocation, goal block information... When extents are read,
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* i_mutex or i_data_sem must be held (for reading is enough in case of
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* i_data_sem). When extents are changed, i_data_sem must be held for writing
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* and also i_mutex must be held.
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*
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* For directories i_mutex is used for all the necessary protection.
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*/
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struct udf_inode_info {
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struct timespec64 i_crtime;
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/* Physical address of inode */
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struct kernel_lb_addr i_location;
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__u64 i_unique;
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__u32 i_lenEAttr;
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__u32 i_lenAlloc;
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__u64 i_lenExtents;
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__u32 i_next_alloc_block;
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__u32 i_next_alloc_goal;
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__u32 i_checkpoint;
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__u32 i_extraPerms;
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unsigned i_alloc_type : 3;
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unsigned i_efe : 1; /* extendedFileEntry */
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unsigned i_use : 1; /* unallocSpaceEntry */
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unsigned i_strat4096 : 1;
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unsigned i_streamdir : 1;
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unsigned reserved : 25;
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union {
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struct short_ad *i_sad;
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struct long_ad *i_lad;
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__u8 *i_data;
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} i_ext;
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struct kernel_lb_addr i_locStreamdir;
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__u64 i_lenStreams;
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struct rw_semaphore i_data_sem;
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struct udf_ext_cache cached_extent;
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/* Spinlock for protecting extent cache */
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spinlock_t i_extent_cache_lock;
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struct inode vfs_inode;
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};
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static inline struct udf_inode_info *UDF_I(struct inode *inode)
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{
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return container_of(inode, struct udf_inode_info, vfs_inode);
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}
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#endif /* _UDF_I_H) */
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