mtd/Documentation/jffs3 JFFS3design.tex, 1.16, 1.17 sb_mgmt.eps, 1.2,
1.3 sb_mgmt.pdf, 1.2, 1.3
Artem Bityutskiy
dedekind at infradead.org
Sun Sep 18 10:30:13 EDT 2005
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Update of /home/cvs/mtd/Documentation/jffs3
In directory phoenix.infradead.org:/tmp/cvs-serv31167
Modified Files:
JFFS3design.tex sb_mgmt.eps sb_mgmt.pdf
Log Message:
Some fixes and renames.
Index: JFFS3design.tex
===================================================================
RCS file: /home/cvs/mtd/Documentation/jffs3/JFFS3design.tex,v
retrieving revision 1.16
retrieving revision 1.17
diff -u -r1.16 -r1.17
--- JFFS3design.tex 15 Aug 2005 08:20:09 -0000 1.16
+++ JFFS3design.tex 18 Sep 2005 14:30:08 -0000 1.17
@@ -531,65 +531,94 @@
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Superblock management} \label{ref_SectionSB}
-\emph{The JFFS3 superblock} is the data structure that describes the
+\emph{The JFFS3 superblock} is the data structure that describes
the file system as a whole (i.e., the offset of the root node, the journal
eraseblocks, etc). When the file system is being mounted, it first finds and
-reads the JFFS3superblock.
+reads the JFFS3 superblock.
In case of traditional file systems the
superblock usually resides at a fixed position on the disk and may be found
very quickly.
Conversely, due to the "out-of-place write" flash property we
-cannot guarantee the fixed position of the JFFS3 superblock unless it . Things are getting
-even more complex because of the need to provide good flash wear levelling -- we
-cannot just reserve several erasable blocks for the SB unless we've guaranteed
-that these eraseblocks will not be worn out before the other eraseblocks.
+cannot guarantee the fixed position of the JFFS3 superblock. Things are getting
+even more complex because of the need to provide good wear levelling -- we
+cannot just reserve several erasable blocks for SB unless we've guaranteed
+that these eraseblocks will not be worn out earlier then the other eraseblocks.
Thus, we have the following two requirements that ought to be met:
\begin{itemize}
\item JFFS3 must be able to quickly find the superblock;
-\item the superblock managing techniques must not spoil the overall flash wear
+\item the superblock management techniques must not spoil the overall flash wear
levelling.
\end{itemize}
-The JFFS3 superblock consists of two parts:
+Classical file systems' superblock usually contains mostly static data which is
+rarely updated and the superblock may have any size. In JFFS3, the superblock
+must be updated quite often (e.g., each time the journal is committed). This
+means that to lessen the amount of I/O, we want to make the JFFS3 superblock
+as small as possible, namely, one sector. There is no reason to keep any static
+data in the superblock (e.g., the size of the file system, its version, etc).
+For static data, JFFS3 reserves the first eraseblock of the JFFS3 partition.
+
+Thus, the following terms are used:
+
\begin{itemize}
-\item \emph{static superblock} -- contains only stative data which is never
-changed by JFFS3; static superblock takes the first not bad eraseblock of the
-JFFS3 partition and may be change only by external user-level tools;
+\item \emph{the static superblock} (\emph{SSB}) -- contains only static
+data which is never changed by JFFS3; static superblock is resided
+at the \emph{static eraseblock} (\emph{SEB});
+the static eraseblock is the first not bad eraseblock of the
+JFFS3 partition; it is supposed that the contents of the static eraseblock
+may only be changed by external user-level tools;
-\item just \emph{superblock} (\emph{SB}) -- contains dynamic data, is often changed and
+\item \emph{the superblock} (\emph{SB}) -- contains dynamic data, is often changed and
requires special methods to deal with it; the rest of this chapter is
-devoted to this dynamic part of the JFFS3 superblock; note, unlike the static
-superblock, the superblock takes one sector, not one eraseblock.
+devoted to the superblock management; the superblock takes one sector.
\end{itemize}
-To maintain the superblock management scheme, JFFS3 reserves two first good
-eraseblocks at the beginning of the flash partition (just after the
-static superblock). These two eraseblocks are called
-\emph{anchor eraseblocks}, or \emph{anchor area}.
-
-Suppose we are storing the superblock in the anchor area.
-The superblock updates are written sequentially to adjacent
-sectors 1,2,3,... of the anchor area.
-When one of the anchor eraseblocks becomes full, the updates are
-written to the second anchor eraseblock and the first one is erased. Thus,
-unclean reboot tolerance is ensured. There may be many copies of the superblock
-in the anchor area, but only the last one copy is valid. Assigning version
-numbers to the copies we may find the valid SB. Since the copies are written
-sequentially, we may even use the binary search algorithm.
-
-The above scheme is bad because the anchor area
-will be worn out much earlier then the rest of flash. To prevent this
-we introduce \emph{anchor eraseblocks level 2} where we consequently write our
-superblock updates. Anchor
-eraseblocks (level 1) will contain references to the L2~anchor eraseblock.
-When the L2~anchor eraseblock
-becomes full, JFFS3 picks another L2~anchor eraseblock, writes the superblock
-update to the new L2~anchor eraseblock, and updates the reference to the
-L2~anchor eraseblock in the anchor area.
-Note, that the L2~anchor eraseblocks fit the main wear-levelling scheme,
-just like any other eraseblocks.
+To implement the superblock management scheme, JFFS3 reserves the first 2 good
+eraseblocks at the beginning of the flash partition (just next to the
+static eraseblock). These two eraseblocks are called
+\emph{anchor eraseblocks} (\emph{AEB}), or the \emph{anchor area}.
+
+Anchor eraseblocks contain references to \emph{chain eraseblocks}
+(\emph{CEB}). Chain eraseblocks may either refer other chain eraseblocks or
+contain the superblock. The last chain eraseblock (which contains the
+superblock) is called the \emph{chain eraseblock level 0} (\emph{CEB0}).
+The CEB which precedes the CEB0 (hence, referes CEB0) is CEB1 and so on.
+
+The JFFS3 superblock management mechanism works as follows. Suppose there are
+$n$ levels of chain eraseblocks. Superblock updates
+are written to consequtive sectors of the CEB0. When CEB0 has no empty
+sectors, new CEB0 is picked, the SB update is written to the new CEB0, and the
+CEB0 reference is written to CEB1. Similarly, when there is no space in CEB1,
+new CEB1 is picked and the corresponding reference is written to CEB2, and so
+on. When there are no free sectors in the chain eraseblock level $n - 1$, new CEB
+level $n - 1$ is picked and the corresponding reference in the anchor area is
+updated.
+
+The following are important notes about the JFFS3 SB management.
+
+\begin{itemize}
+\item Each write to CEB or AEB takes one sector as this is the minimal JFFS3 I/O
+unit. So, CEB may be updated as many times as there are sectors in the eraseblock.
+
+\item When JFFS3 picks new CEB it uses the common JFFS3 wear-levelling
+scheme, so CEB fit the overall JFFS3 wear-levelling.
+
+\item Anchor area has 2 eraseblocks in order to ensure tolerance to unclean
+reboots -- we may safely erase one AEB while the other is filled.
+
+\item When a new reference is written to the anchor area or to a chain
+eraseblock, the previous references become dirty. On mount, JFFS3 must find
+the valid reference. Each reference has its version number.
+Each subsequent reference has higher version then the previous.
+Hence, JFFS3 may use binary search to quickly find the valid reference. The
+same is true for CEB0, which contains copies of SB, instead of references.
+
+\item Since unclean reboot may happen anytime, no CEB/AEB is erased before the
+whole chain is updated. This makes it possible to recover
+from the broken chain of AEB/CEB and find the superblock.
+\end{itemize}
%
% The figure with the SB management scheme
@@ -602,75 +631,61 @@
\label{ref_FigureSBMgmt}
\end{figure}
-Figure \ref{ref_FigureSBMgmt} illustrates the SB management scheme with two
-levels of anchor eraseblocks.
+Figure \ref{ref_FigureSBMgmt} illustrates the SB management scheme when $n = 1$,
+i.e., one chain eraseblock is used (CEB0). It is not that difficult to extend
+the example for higher $n$.
\begin{enumerate}
\item[a).] Eraseblocks number 1 and 2 are reserved for the anchor area.
-The first sector of the first anchor eraseblock refers the L2~anchor eraseblock.
-The first sector of the L2~anchor eraseblock (number 5) contains the superblock.
+The first sector of the first AEB refers CEB0 (eraseblock number 5).
+The first sector of CEB0 contains the superblock.
\item[b).] The superblock was updated and was written to the second sector of
-the L2~anchor eraseblock. The first sector of
-the L2~anchor eraseblock becomes dirty and doesn't contain valid data any longer.
-The anchor eraseblocks remain unchanged.
+CEB0. The first sector of CEB0 becomes dirty and doesn't contain valid data
+any longer. The anchor eraseblocks remain unchanged.
\item[c).] The superblock was updated several times and was written to the
-adjacent sectors of the L2~anchor eraseblock. The last sector of the L2~anchor eraseblock is
+adjacent sectors of CEB0. The last sector of CEB0 is
occupied by the superblock, the other sectors contain dirt. The anchor eraseblocks
were not changed so far.
-\item[d).] The L2~anchor eraseblock has no more free sectors. JFFS3 selects another
-L2~anchor eraseblock, taking into account the wear-levelling. At this point Garbage
-Collector may be invoked if there are no free eraseblocks. Then the L2~anchor eraseblock
-reference in the anchor eraseblock is updated, and the second sector of the anchor
-block is occupied by the new L2~anchor eraseblock reference while the first sector contains
-dirt. The new L2~anchor eraseblock is now at the flash eraseblock number 79. The
-old L2~anchor eraseblock may now be erased and re-used for any purposes.
+\item[d).] CEB0 had no more free sectors. JFFS3 selected another
+eraseblock for CEB0, taking into account wear-levelling. At this point, Garbage
+Collector could be invoked if there were no free eraseblocks. Then the reference
+to CEB0 in AEB is updated (the second sector of the first AEB is filled).
+New CEB0 is now at the eraseblock number 79. The
+old CEB0 may now be erased and re-used for any purposes.
\item[e).] The superblock was updated many times and the position of the
-L2~anchor eraseblock was changed many times. The current L2~anchor eraseblock number is 3. The
-first anchor eraseblock is full and its last sector refers the current
-L2~anchor eraseblock.
+CEB0 was changed many times. At the moment, CEB0 is at eraseblock number 3.
+The first AEB is full and its last sector refers the current CEB0.
\item[f).] The superblock was updated many times. JFFS3 starts using the
-second anchor eraseblock, and the first anchor eraseblock is erased. The
-reason why JFFS3 makes use of two anchor eraseblocks is to guarantee the
-unclean reboot tolerance.
+second AEB, and the first AEB is erased.
\end{enumerate}
-Obviously, with the L2~anchor eraseblock approach the anchor area is erased $N$ times
-less then if there would be no L2~anchor eraseblocks ($N$ is the number of sectors
-per eraseblock).
-
-If the flash chip is larger then a certain size, the proposed scheme with 2
-levels of anchor eraseblocks does not guarantee that the anchor eraseblocks are not worn out
-earlier then the other eraseblocks. But we may introduce the
-third level of anchor eraseblocks. Then the anchor eraseblock will refer the
-L2~anchor eraseblock, which, in turn, will refer the L3~anchor eraseblock where the
-superblock will be stored. If the three-level scheme is not enough, four-level
-scheme may be used, and so
-forth. Thus, by means of adding more anchor eraseblock levels we may guarantee the
-appropriate anchor area erase rate. Note, that the anchor eraseblocks of any
-level obey the global JFFS3 wear-levelling rules, so we don't need to
-worry about the wearing of those eraseblocks.
+The number of required chain eraseblocks depends on size of the JFFS3
+partition. The larger is JFFS3, the more levels are needed. This is
+determined by the need to ensure that the anchor area will not worn out earlier
+then the rest of the partition.
+
+Let's calculate $n$ assuming that:
-Let's calculate the number of anchor eraseblock levels assuming that:
\begin{itemize}
\item the live-cycle of one eraseblock is $L$, i.e., there are $L$ guaranteed
erases for each eraseblock (typically $\sim 10^5$ for NAND flashes);
-\item the total number eraseblocks on the JFFS2 flash partition is $M$;
+\item the total number eraseblocks on the partition is $M$;
\item the number of sectors per eraseblock is $N$;
\item the file system data is updated with average rate $R$ sectors
per second;
\item the anchor area is updated with constant average rate $R_A$ sectors per
second;
-\item the file system data area (i.e., the whole flash minus the superblock
+\item the file system data area (i.e., the whole flash minus the static eraseblock
and the anchor area) is updated
with constant average rate $R_D$ sectors per second;
\item the period of time of the total anchor area wear is $T_A$;
\item the period of time of the total data area wear is $T_D$;
-\item the number of used anchor eraseblock layers is $n$.
+\item the number of used chain eraseblocks is $n$.
\end{itemize}
In our calculation we will assume the worst case scenario when any file system data
@@ -696,7 +711,7 @@
\label{ref_Equation_TA_and_TD}
\end{equation}
-If $n = 0$, i.e., there are no L2~anchor eraseblocks and the superblock is stored in
+If $n = 0$, i.e., there are no chain eraseblocks and the superblock is stored in
the anchor area, then taking into account (\ref{ref_Equation_TA_and_TD})
and that in this case $R_A = R_D = R$, we have
@@ -704,10 +719,10 @@
\frac{T_A}{T_D} = 2 \cdot \frac{1}{(M-2)}
$$
-If $n = 1$. i.e., L2~anchor eraseblocks are used, the anchor area will
+If $n = 1$. i.e., CEB0 is used, the anchor area will
be written $N$ times less frequently as the data area will be written $2$ times
more frequently, because each file system data update will require (a) the
-superblock update and (b) the SB reference update in the anchor eraseblock.
+superblock update and (b) the reference update in the anchor area.
Therefore, $R_A = R/N$ and $R_D = 2R$ and from (\ref{ref_Equation_TA_and_TD})
we have
@@ -715,11 +730,11 @@
\frac{T_A}{T_D} = 2 \cdot \frac{2N}{M-2}
$$
-When $n = 2$, i.e., three levels of anchor eraseblocks are used, the anchor area will
+When $n = 2$, i.e., CEB0 and CEB1 are used, the anchor area will
be written $N^2$ times less frequently, while the data area will be written
$2+1/N$ times more frequently (one superblock update on each file
-system update and one L2~anchor eraseblock update per N L3~anchor eraseblock
-updates). Therefore, $R_A=R/N^2$ and $R_D = (2 + 1/N) \cdot R$ and from
+system update and one CEB1 update per N CEB0 updates).
+Therefore, $R_A=R/N^2$ and $R_D = (2 + 1/N) \cdot R$ and from
(\ref{ref_Equation_TA_and_TD}) we have
$$
@@ -739,7 +754,7 @@
$$
Consequently, from (\ref{ref_EquationSBIneq}) we have the following inequality
-to be satisfied
+to be satisfied:
$$
2 \cdot \frac{2N^n + N^{n-1} + \ldots + N}{M-2} \geqslant 1
@@ -751,46 +766,44 @@
\label{ref_EquationSBIneq1}
\end{equation}
-Table \ref{ref_TableNANDLevels} describes the number of required anchor eraseblock
-levels for NAND flash of different sizes.
+Table \ref{ref_TableNANDLevels} describes the number of required chain
+eraseblockss for NAND flashes of different size.
\begin{table}[h]
\begin{center}
\begin{tabular}{llllll}
\textbf{Type} & \textbf{Size} & \textbf{Sect. size} & $\bf M$ & $\bf N$ &
-\textbf{Levels ($\bf n$)}\\
+\textbf{$\bf n$}\\
\hline
Toshiba TC58DVM92A1FT & 64MB & 16KB & 4096 & 32 & 2\\
Toshiba TH58NVG1S3AFT05 & 512MB & 128KB & 4096 & 64 & 2\\
ST Micro NAND08G-B & 1GB & 128KB & 8192 & 64 & 2\\
Samsung K9K1G08X0B & 2GB & 128KB & 16384 & 64 & 2\\
\end{tabular}
-\caption{The number of required anchor eraseblock levels for different types of
+\caption{The number of required chain eraseblock levels for different types of
existing NAND flashes.} \label{ref_TableNANDLevels}
\end{center}
\end{table}
-Note, providing that $N=64$, three anchor eraseblock levels are enough to guarantee
-acceptable anchor area wear leveling up to 128GB flash and four
-L2~anchor eraseblock levels -- up to 8TB (the inequality \ref{ref_EquationSBIneq1}).
-
-To find the superblock during the mount, JFFS3 finds the valid reference in the
-anchor eraseblocks, then finds the valid reference in the anchor eraseblocks of level
-$2$,~$3$,~$\ldots$,~$n-1$, and finally finds the valid superblock's sector in the
-anchor eraseblock level~$n$.
-Since JFFS3 assigns versions to the sectors of the anchor eraseblocks
+Note, providing that $N=64$, three CEB levels are enough to guarantee
+acceptable anchor area wear leveling for up to 128GB flash, and four
+CEB levels -- for up to 8TB flash (the inequality \ref{ref_EquationSBIneq1}).
+
+To find the superblock during mount, JFFS3 finds the valid reference in the
+anchor eraseblocks, then finds the valid reference in CEB levels
+$n-1$,~$n-2$,~$\ldots$,~$1$, and finally finds the valid superblock in CEB0.
+Since JFFS3 assigns versions to sectors of AEB/CEB
and the versions are increased by one on every update,
the binary search algorithm may be used to find the valid sector.
-The valid L1~anchor eraseblock reference in the anchor area may be found after
+The valid reference in the anchor area may be found after
$log_2(2N)+2$ steps (one step involves one sector read operation),
-the reference to the L2~anchor eraseblock -- after
+the reference in CEB -- after
$log_2(N)+2$ steps, and so on. Thus, to find the superblock, JFFS3 must read
-
\begin{equation}
S = 2(n+1) + log_2(2N) + n \cdot log_2(N)
\end{equation}
-flash sectors.
+sectors.
Table \ref{ref_TableNANDTimes} contains the approximate SB search time for
different existing NAND flashes.
@@ -809,9 +822,9 @@
\end{center}
\end{table}
-For larger flash chips which would utilize the level 3 SB management scheme (no
-such flashes exist at the moment) the SB search time would be 4.3ms providing
-the flash characteristics are the same as the ST Micro's one (see table
+For larger flash chips which would utilize SB management scheme with $n = 3$ (no
+such flashes exist at the moment), the SB search time would be 4.3ms, providing
+the flash characteristics are the same as ST Micro's (see table
\ref{ref_TableNANDTimes}).
Note, the calculated SB search time doesn't contain the ECC/CRC checking
@@ -827,16 +840,18 @@
\item \textbf{ACL} -- a modern mechanism to control accesses to files, see
[\ref{ref_ACL}] for more details.
-\item \textbf{Anchor erasable blocks, anchor area}
+\item \textbf{Anchor erasblock, anchor area}
-- two \emph{good} erasable blocks at the beginning of the JFFS3 partition
which are reserved for the superblock management.
-The JFFS3 superblock management scheme implies several levels of
-anchor eraseblocks (typically 2-4 levels). Anchor eraseblocks level 2, 3, etc
-have no fixed position on the flash.
\item \textbf{Branch node} -- any node that is not leaf, not twig and not root
is called branch node.
+\item \textbf{Chain eraseblock} -- an eraseblock containing references to
+other chain eraseblock of lower lavel or the superblock.
+Chain eraseblocks facilitate quich SB searching and are part of the JFFS3
+superblock management scheme.
+
\item \textbf{Directory entry} -- basically associates a
name with an inode number. Directories may be considered as a list of directory
entries.
@@ -899,9 +914,9 @@
allocation of eraseblocks, block and sectors. The wear-levelling algorithms are
encapsulated here.
-\item \textbf{Static superblock} -- the fist good erasable block of the JFFS3
+\item \textbf{Static eraseblock} -- the fist good erasable block of the JFFS3
partition where the per-file system static data is stored. JFFS3 may only read
-it and it is created by external formatting tools.
+it and it is created/changed by external formatting tools.
\item \textbf{Stat-data} -- we keep file's (directory's, etc) data and
metadata separately. Stat-data contains file's attributes, access permissions,
@@ -940,7 +955,10 @@
\section{Abbreviations}
\begin{enumerate}
\item \textbf{ACL} -- Access Control List
+\item \textbf{AEB} -- Anchor Erasable Block
\item \textbf{ECC} -- Error Correction Code
+\item \textbf{CEB} -- Chain Erasable Block
+\item \textbf{CEB<number>} -- Chain Erasable Block level <number>
\item \textbf{CRC} -- Cyclic Redundancy Check
\item \textbf{FS} -- File System
\item \textbf{GC} -- Garbage Collector
@@ -948,7 +966,9 @@
\item \textbf{JFFS3} -- Journalling Flash File System version 3
\item \textbf{MTD} -- Memory Technology Devices
\item \textbf{RAM} -- Random Access Memory
+\item \textbf{SEB} -- Static Erasable Block
\item \textbf{SB} -- Super Block
+\item \textbf{SB} -- Static Superblock
\item \textbf{VFS} -- Virtual File System
\item \textbf{UID} -- User Identifier
\end{enumerate}
Index: sb_mgmt.eps
===================================================================
RCS file: /home/cvs/mtd/Documentation/jffs3/sb_mgmt.eps,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -r1.2 -r1.3
--- sb_mgmt.eps 1 Aug 2005 11:37:39 -0000 1.2
+++ sb_mgmt.eps 18 Sep 2005 14:30:09 -0000 1.3
@@ -20,21 +20,21 @@
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-%0000000000000000104064208120441208880400450000000000
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-%0000000000000000104034208920441208880400450000000000
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@@ -52,21 +52,21 @@
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-%0000000000000000104040000928208900820912494502000000
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-%0000000000000000104040000928208901020890094503000000
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-2798 -194 2774 -179 2765 -158 ct p
-2765 -136 m 2765 -152 2785 -167 2807 -167 ct 2840 -167 2861 -134 2861 -83 ct
-2861 -36 2841 -9 2806 -9 ct 2784 -9 2765 -19 2765 -29 ct p ef
-2921 -263 m 2923 -263 l 2928 -263 2933 -264 2936 -264 ct 2950 -264 2954 -258 2954 -238 ct
-2954 -36 l 2954 -13 2948 -8 2921 -6 ct 2921 0 l 3021 0 l 3021 -6 l 2995 -8 2989 -12 2989 -35 ct
-2989 -288 l 2988 -288 l 2966 -281 2950 -277 2921 -270 ct p ef
-3136 -194 m 3081 -194 3043 -153 3043 -95 ct 3043 -38 3082 4 3135 4 ct 3189 4 3229 -40 3229 -98 ct
-3229 -154 l 3190 -194 l p
-3131 -182 m 3166 -182 3191 -142 3191 -84 ct 3191 -36 3172 -7 3140 -7 ct 3124 -7 3108 -17 3099 -34 ct
-3088 -56 3081 -86 3081 -116 ct 3081 -156 l 3101 -182 l p ef
-3411 -65 m 3391 -36 3375 -26 3351 -26 ct 3313 -26 3286 -60 3286 -108 ct 3286 -152 3309 -182 3343 -182 ct
-3358 -182 3364 -177 3368 -162 ct 3371 -152 l 3374 -140 3382 -133 3391 -133 ct
-3402 -133 3411 -141 3411 -151 ct 3411 -174 3381 -194 3346 -194 ct 3325 -194 3303 -186 3286 -170 ct
-3265 -152 3253 -123 3253 -90 ct 3253 -35 3286 4 3333 4 ct 3352 4 3369 -2 3385 -15 ct
-3396 -25 3404 -37 3417 -62 ct p ef
-3431 -263 m 3437 -263 3441 -264 3445 -264 ct 3459 -264 3463 -258 3463 -238 ct
-3463 -34 l 3463 -12 3462 -11 3431 -6 ct 3431 0 l 3530 0 l 3530 -6 l 3522 -6 l
-3505 -7 3499 -13 3499 -28 ct 3499 -106 l 3558 -27 l 3559 -25 l 3560 -24 3561 -22 3562 -21 ct
-3566 -17 3567 -14 3567 -12 ct 3567 -8 3563 -6 3558 -6 ct 3550 -6 l 3550 0 l
-3642 0 l 3642 -6 l 3624 -7 3610 -15 3593 -37 ct 3528 -119 l 3540 -130 l
-3570 -158 3596 -178 3609 -181 ct 3615 -183 3621 -184 3628 -184 ct 3632 -184 l
-3632 -190 l 3545 -190 l 3545 -184 l 3562 -184 3566 -182 3566 -176 ct 3566 -173 3563 -167 3557 -162 ct
-3499 -110 l 3499 -288 l 3497 -288 l 3481 -283 3469 -280 3444 -273 ct 3431 -270 l
-p ef
-3774 -132 m 3772 -190 l 3767 -190 l 3767 -189 l 3763 -186 3762 -186 3761 -186 ct
-3758 -186 3754 -186 3749 -189 ct 3740 -192 3731 -194 3720 -194 ct 3686 -194 3662 -172 3662 -142 ct
-3662 -118 3676 -101 3712 -81 ct 3736 -67 l 3751 -58 3758 -48 3758 -35 ct 3758 -16 3745 -5 3723 -5 ct
-3709 -5 3695 -10 3687 -19 ct 3679 -30 3675 -40 3669 -64 ct 3663 -64 l 3663 1 l
-3668 1 l 3671 -2 3673 -3 3678 -3 ct 3682 -3 3687 -2 3697 0 ct 3709 2 3720 4 3728 4 ct
-3761 4 3788 -20 3788 -49 ct 3788 -71 3778 -85 3752 -100 ct 3706 -127 l 3695 -134 3688 -144 3688 -156 ct
-3688 -173 3701 -184 3721 -184 ct 3745 -184 3758 -170 3767 -132 ct p ef
+262 -190 m 258 -285 l 249 -285 l 247 -277 240 -271 231 -271 ct 228 -271 221 -273 215 -275 ct
+194 -282 173 -285 153 -285 ct 118 -285 83 -272 57 -249 ct 27 -223 11 -184 11 -137 ct
+11 -98 24 -61 46 -37 ct 71 -10 110 5 152 5 ct 200 5 241 -13 267 -47 ct 260 -55 l
+228 -25 200 -12 165 -12 ct 139 -12 115 -21 97 -37 ct 74 -57 60 -96 60 -142 ct 60 -219 100 -269 161 -269 ct
+185 -269 207 -260 224 -243 ct 238 -229 244 -217 252 -190 ct p ef
+536 -71 m 524 -71 l 503 -25 485 -15 424 -15 ct 413 -15 l 392 -15 374 -17 371 -20 ct
+369 -22 369 -26 369 -33 ct 369 -138 l 434 -138 l 468 -138 475 -132 480 -97 ct
+490 -97 l 490 -195 l 480 -195 l 477 -178 476 -172 471 -166 ct 465 -159 454 -155 434 -155 ct
+369 -155 l 369 -249 l 369 -261 371 -263 382 -263 ct 440 -263 l 487 -263 497 -257 504 -219 ct
+514 -219 l 513 -280 l 289 -280 l 289 -271 l 320 -269 325 -263 325 -233 ct
+325 -46 l 325 -16 319 -10 289 -8 ct 289 0 l 517 0 l p ef
+547 -280 m 547 -271 l 582 -269 587 -265 587 -233 ct 587 -46 l 587 -14 582 -9 547 -8 ct
+547 0 l 688 0 l 721 0 751 -8 767 -23 ct 782 -36 790 -55 790 -76 ct 790 -94 783 -111 770 -123 ct
+757 -135 745 -140 718 -147 ct 740 -152 749 -156 759 -165 ct 770 -175 776 -190 776 -208 ct
+776 -255 738 -280 665 -280 ct p
+630 -137 m 671 -137 691 -135 706 -129 ct 730 -119 742 -102 742 -75 ct 742 -52 733 -36 716 -26 ct
+702 -19 685 -15 657 -15 ct 636 -15 630 -19 630 -33 ct p
+630 -154 m 630 -251 l 630 -260 633 -264 640 -264 ct 658 -264 l 707 -264 733 -244 733 -206 ct
+733 -173 710 -154 671 -154 ct p ef
+928 -285 m 905 -285 887 -278 871 -263 ct 847 -240 831 -191 831 -142 ct 831 -96 845 -46 864 -22 ct
+880 -4 902 5 926 5 ct 948 5 966 -1 981 -16 ct 1006 -39 1022 -88 1022 -139 ct 1022 -226 l
+983 -285 l p
+927 -274 m 962 -274 981 -227 981 -138 ct 981 -50 963 -5 926 -5 ct 890 -5 871 -50 871 -138 ct
+871 -228 l 890 -274 l p ef
pom
gr
2050 4500 m 1925 4500 l 1925 3500 l 2175 3500 l 2175 4500 l 2050 4500 l
Index: sb_mgmt.pdf
===================================================================
RCS file: /home/cvs/mtd/Documentation/jffs3/sb_mgmt.pdf,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -r1.2 -r1.3
Binary files /tmp/cvsF75hNl and /tmp/cvsibNH9B differ
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