说明：关键字
- mount
- /dev/block/xxx
- /dev/block/by-name
- {project}.xml
1. 查找块设备分区
adb shell 之后 mount 命令查看文件目录挂载的块设备分区（块设备节点）
C:\Users\calm.xia>adb shell
xxxproject:/ # mount
/dev/block/dm-3 on / type ext4 (ro,seclabel,relatime)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,size=1845504k,nr_inodes=461376,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600,ptmxmode=000)
proc on /proc type proc (rw,relatime,gid=3009,hidepid=2)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
tmpfs on /mnt type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=1845504k,nr_inodes=461376,mode=755,gid=1000)
tmpfs on /apex type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=1845504k,nr_inodes=461376,mode=755)
/dev/block/mmcblk0p38 on /metadata type ext4 (rw,seclabel,nosuid,nodev,noatime,errors=panic,data=ordered)
/dev/block/dm-4 on /vendor type ext4 (ro,seclabel,relatime)
/dev/block/dm-5 on /product type ext4 (ro,seclabel,relatime)
none on /dev/cg2_bpf type cgroup2 (rw,nosuid,nodev,noexec,relatime)
none on /dev/cpuctl type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
none on /acct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct)
none on /dev/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset,noprefix,release_agent=/sbin/cpuset_release_agent)
none on /dev/memcg type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
none on /dev/stune type cgroup (rw,nosuid,nodev,noexec,relatime,schedtune)
debugfs on /sys/kernel/debug type debugfs (rw,seclabel,relatime)
none on /config type configfs (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime)
pstore on /sys/fs/pstore type pstore (rw,seclabel,nosuid,nodev,noexec,relatime)
adb on /dev/usb-ffs/adb type functionfs (rw,relatime)
tracefs on /sys/kernel/debug/tracing type tracefs (rw,seclabel,relatime)
/dev/block/mmcblk0p42 on /data type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,reserve_ro
ot=51200,resuid=0,resgid=0,alloc_mode=default,fsync_mode=posix)
/dev/block/mmcblk0p33 on /cache type ext4 (rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,data=ordered)
/dev/block/mmcblk0p1 on /mnt/vendor type ext4 (rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc)
/dev/block/dm-6 on /mnt/vendor/socko type ext4 (ro,seclabel,nosuid,nodev,noatime,noauto_da_alloc)
/dev/block/dm-7 on /mnt/vendor/odmko type ext4 (ro,seclabel,nosuid,nodev,noatime,noauto_da_alloc)
tmpfs on /storage type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=1845504k,nr_inodes=461376,mode=755,gid=1000)
/dev/block/loop2 on /apex/com.android.resolv@291601500 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop2 on /apex/com.android.resolv type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop3 on /apex/com.android.media@291601500 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop3 on /apex/com.android.media type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop4 on /apex/com.android.runtime@1 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop4 on /apex/com.android.runtime type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop5 on /apex/com.android.media.swcodec@291601500 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop5 on /apex/com.android.media.swcodec type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop6 on /apex/com.android.tzdata@291601500 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop6 on /apex/com.android.tzdata type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop7 on /apex/com.android.conscrypt@291601500 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop7 on /apex/com.android.conscrypt type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop8 on /apex/com.android.apex.cts.shim@1 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop8 on /apex/com.android.apex.cts.shim type ext4 (ro,dirsync,seclabel,nodev,noatime)
cgroup_root on /sys/fs/cgroup type tmpfs (rw,seclabel,relatime,size=1845504k,nr_inodes=461376)
/data/media on /mnt/runtime/default/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /storage/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/runtime/read/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=23,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/runtime/write/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/runtime/full/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
/dev/block/dm-8 on /mnt/scratch type f2fs (rw,lazytime,seclabel,relatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,reserve_root=4362,res
uid=0,resgid=0,alloc_mode=reuse,fsync_mode=posix)
overlay on /system type overlay (rw,seclabel,relatime,lowerdir=/system,upperdir=/mnt/scratch/overlay/system/upper,workdir=/mnt/scratch/overlay/system/work,override_creds=off)
overlay on /vendor type overlay (rw,seclabel,relatime,lowerdir=/vendor,upperdir=/mnt/scratch/overlay/vendor/upper,workdir=/mnt/scratch/overlay/vendor/work,override_creds=off)
overlay on /product type overlay (rw,seclabel,relatime,lowerdir=/product,upperdir=/mnt/scratch/overlay/product/upper,workdir=/mnt/scratch/overlay/product/work,override_creds=off)
xxxproject:/ #
2. 查找块设备分区挂载的文件系统
进入 /dev/block/by-name 目录查看块设备分区是被哪个文件系统挂载
xxxproject:/dev/block/by-name # ls -l | grep mmcblk0p1
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 fbootlogo -> /dev/block/mmcblk0p13
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 gnssmodem -> /dev/block/mmcblk0p18
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 l_fixnv1 -> /dev/block/mmcblk0p14
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 l_fixnv2 -> /dev/block/mmcblk0p15
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 l_runtimenv1 -> /dev/block/mmcblk0p16
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 l_runtimenv2 -> /dev/block/mmcblk0p17
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 logo -> /dev/block/mmcblk0p12
lrwxrwxrwx 1 root root 20 2019-10-17 06:34 prodnv -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 uboot_bak -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 uboot_log -> /dev/block/mmcblk0p11
lrwxrwxrwx 1 root root 21 2019-10-17 06:34 wcnmodem -> /dev/block/mmcblk0p19
xxxproject:/dev/block/by-name #
3. out目录下{project}.xml文件中查看分区大小
calm.xia@xxx:~/10_android/out/target/product/ums512_1h10$ vi ums512_1h10.xml
<Partitions>
<!-- size unit is MBytes -->
<Partition id="prodnv" size="10"/>
