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ab9a3a7372
Windows is capable of creating UDF files having named streams. One example is the "Zone.Identifier" stream attached automatically to files downloaded from a network. See: https://msdn.microsoft.com/en-us/library/dn392609.aspx Modification of a file having one or more named streams in Linux causes the stream directory to become detached from the file, essentially leaking all blocks pertaining to the file's streams. Fix by saving off information about an inode's streams when reading it, for later use when its on-disk data is updated. Link: https://lore.kernel.org/r/20190814125002.10869-1-steve@digidescorp.com Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Jan Kara <jack@suse.cz>
67 lines
1.8 KiB
C
67 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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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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