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swap: Add flag to identify block swap devices

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Added SWP_BLKDEV flag to distinguish block and regular file backed
swap devices. We could also check if a swap is entire block device,
rather than a file, by:
S_ISBLK(swap_info_struct->swap_file->f_mapping->host->i_mode)
but, I think, simply checking this flag is more convenient.

Signed-off-by: Nitin Gupta <[email protected]>
Acked-by: Linus Torvalds <[email protected]>
Acked-by: Nigel Cunningham <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Reviewed-by: Minchan Kim <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Nitin Gupta 2010-05-17 11:02:42 +05:30 • committed by Greg Kroah-Hartman
commit b272564395
2 changed files with 2 additions and 0 deletions
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1
mm/swapfile.c
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@ -1884,6 +1884,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
if (error < 0)
goto bad_swap;
p->bdev = bdev;
p->flags |= SWP_BLKDEV;
} else if (S_ISREG(inode->i_mode)) {
p->bdev = inode->i_sb->s_bdev;
mutex_lock(&inode->i_mutex);