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shmfd: consistently return size in 512 byte blocks for fstat(2) st_blocks

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This is ABI-breaking change that could be considered as the bug fix.

Requested by:	David Timber <[email protected]>
Reviewed by:	emaste, markj
Sponsored by:	The FreeBSD Foundation
Relnotes:	yes
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D58942
This commit is contained in:
Konstantin Belousov committed 2026-08-19 17:46:34 +03:00
1 parent 805c5004fa
commit 3a1bf59d19
2 files changed
+8 -8
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lib/libsys/stat.2
+6 -2
View File
@@ -271,10 +271,14 @@ be zero.
.Pp
For file descriptors referencing specific non-file objects,
the field is type-specific.
.Pp
For POSIX shared memory segments
.Pq see Xr shm_open 2 ,
the block size is equal to
the platform page size
the block size is 512 bytes.
For older versions of
.Fx
.Pq before 15.2 and 16.0
the block size was equal to the platform page size
.Pq Xr getpagesize 2 .
.El
.Pp
sys/kern/uipc_shm.c
+2 -6
View File
@@ -658,12 +658,8 @@ shm_stat(struct file *fp, struct stat *sb, struct ucred *active_cred)
sb->st_dev = shm_dev_ino;
sb->st_ino = shmfd->shm_ino;
sb->st_nlink = shmfd->shm_object->ref_count;
if (shm_largepage(shmfd)) {
sb->st_blocks = shmfd->shm_object->size /
(pagesizes[shmfd->shm_lp_psind] >> PAGE_SHIFT);
} else {
sb->st_blocks = shmfd->shm_pages;
}
sb->st_blocks = ptoa(shm_largepage(shmfd) ? shmfd->shm_object->size :
shmfd->shm_pages) / DEV_BSIZE;
return (0);
}