Get filesystem statistics
#include <sys/dcmd_blk.h> #define DCMD_FSYS_STATISTICS __DIOF(_DCMD_FSYS, 11, struct fs_stats) #define DCMD_FSYS_STATISTICS_CLR __DIOF(_DCMD_FSYS, 12, struct fs_stats)
| Argument | Value |
|---|---|
| filedes | A file descriptor that you obtained by opening the device. |
| dcmd | DCMD_FSYS_STATISTICS or DCMD_FSYS_STATISTICS_CLR |
| dev_data_ptr | A pointer to a struct fs_stats |
| n_bytes | sizeof(struct fs_stats) |
| dev_info_ptr | NULL |
These commands get statistics about the filesystem associated with the given file descriptor. DCMD_FSYS_STATISTICS_CLR sets the counters to zero after returning their values. The fsysinfo utility is a front end for DCMD_FSYS_STATISTICS.
In order to use these commands, your process needs to have the vfs/stats-clear (BLK_ABILITY_STATSCLEAR) custom ability enabled. For more information, see procmgr_ability() and procmgr_ability_lookup() in the C Library Reference.
None.
A filled-in struct fs_stats, which is defined in <sys/fs_stats.h> as follows:
struct fs_stats {
/* Version and Time statistics */
uint32_t s_version; /* Lib version (BLKIO_VERSION) */
uint32_t s_fsys_flags; /* Fsys mount flags (_MOUNT_*) */
uint32_t s_time_mount; /* Time that file system mounted */
uint32_t s_time_clr; /* Time that statistics cleared */
/* Buffer/DiskIO statistics */
uint64_t s_buf_rphys; /* Physical reads from disk */
uint64_t s_buf_wphys; /* Physical writes to disk */
uint64_t s_buf_readahead; /* Physical predictive reads */
uint64_t s_buf_direct; /* Physical direct-io accesses */
uint64_t s_buf_badblks; /* Physical IO errors */
uint64_t s_buf_rcache; /* Cache reads (read hits) */
uint64_t s_buf_wcache; /* Cache writes (write-behind) */
uint64_t s_buf_mru; /* MRU cache kB (GLOBAL) */
uint64_t s_buf_mfu; /* MFU cache kB (GLOBAL) */
/* Name cache statistics */
uint64_t s_name_poshits; /* Positive hits (usable hit) */
uint64_t s_name_neghits; /* Negative hits (usable hit) */
uint64_t s_name_misses; /* Misses (not in cache) */
uint64_t s_name_uncacheable; /* Names not considered (long/ambig) */
uint64_t s_name_stale; /* Stale hits (GLOBAL) */
/* System call API statistics */
uint64_t s_syscall_open; /* Number of open()s */
uint64_t s_syscall_stat; /* Number of stat()s */
uint64_t s_syscall_namei; /* Number of name lookups */
uint64_t s_syscall_read; /* Number of read() calls */
uint64_t s_syscall_write; /* Number of write() calls */
uint64_t s_syscall_devctl; /* Number of devctl() calls */
uint64_t s_syscall_create; /* Number of file creations */
uint64_t s_syscall_unlink; /* Number of file deletions */
/* Mapping cache statistics */
uint64_t s_map_hits; /* Usable hits */
uint64_t s_map_misses; /* Misses (not in cache) */
/* Vnode statistics */
uint64_t s_vnode_create; /* Created vnode (unique file) */
uint64_t s_vnode_hits; /* Usable vnode hit */
uint64_t s_vnode_lock; /* Vnodes locked */
uint64_t s_vnode_recycle; /* Reused vnode (GLOBAL) */
/* Slab/memory statistics */
uint64_t s_slab_pg_map; /* Memory pages mapped (GLOBAL) */
uint64_t s_slab_pg_unmap; /* Memory pages unmapped (GLOBAL) */
/* Thread pool statistics */
uint64_t s_tid_pool_create; /* Threads created (GLOBAL) */
uint64_t s_tid_pool_destroy; /* Threads destroyed (GLOBAL) */
/* New statistics added June, 2011 */
uint64_t s_buf_rcache_bytes; /* Bytes read from the cache */
uint64_t s_buf_wcache_bytes; /* Bytes written into the cache */
uint64_t s_buf_rphys_bytes; /* Physical bytes read from disk */
uint64_t s_buf_wphys_bytes; /* Physical bytes written to disk */
uint64_t s_buf_readahead_bytes; /* Physical bytes from read ahead */
uint64_t s_buf_direct_bytes; /* Physical bytes R/W direct-io */
uint64_t s_buf_io_count; /* Count of IO requests created */
uint64_t s_buf_io_bytes; /* Total bytes of io requests */
uint64_t s_syscall_read_bytes; /* Number of bytes read via read() */
uint64_t s_syscall_write_bytes; /* Number of bytes wrote via write()*/
uint64_t s_syscall_trunc; /* Number of truncate() calls */
uint64_t s_syscall_rename; /* Number of rename() calls */
uint64_t s_syscall_owner; /* chown/chgrp calls */
uint64_t s_syscall_modes; /* chmod calls */
uint64_t s_syscall_sync; /* Number of sync() calls */
uint64_t s_vfs_relearn; /* Count of relearn events */
uint64_t s_vfs_periodic; /* Periodic call count into the fs */
uint64_t s_msg_resume; /* Number of message resume ops */
/* Spares (new statistics) */
uint64_t s_spare[13];
};