43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* This is the filp table. It is an intermediary between file descriptors and
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* inodes. A slot is free if filp_count == 0.
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*/
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EXTERN struct filp {
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mode_t filp_mode; /* RW bits, telling how file is opened */
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int filp_flags; /* flags from open and fcntl */
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int filp_state; /* state for crash recovery */
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int filp_count; /* how many file descriptors share this slot?*/
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/* struct inode *filp_ino;*/ /* pointer to the inode */
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struct vnode *filp_vno;
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u64_t filp_pos; /* file position */
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/* the following fields are for select() and are owned by the generic
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* select() code (i.e., fd-type-specific select() code can't touch these).
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*/
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int filp_selectors; /* select()ing processes blocking on this fd */
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int filp_select_ops; /* interested in these SEL_* operations */
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int filp_select_flags; /* Select flags for the filp */
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/* following are for fd-type-specific select() */
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int filp_pipe_select_ops;
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} filp[NR_FILPS];
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#define FILP_CLOSED 0 /* filp_mode: associated device closed */
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#define FS_NORMAL 0 /* file descriptor can be used normally */
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#define FS_NEEDS_REOPEN 1 /* file descriptor needs to be re-opened */
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#define FSF_UPDATE 1 /* The driver should be informed about new
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* state.
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*/
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#define FSF_BUSY 2 /* Select operation sent to driver but no
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* reply yet.
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*/
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#define FSF_BLOCK 4 /* Request is blocking, the driver should
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* keep state.
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*/
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#define NIL_FILP (struct filp *) 0 /* indicates absence of a filp slot */
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